1 /*
2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2015 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "jvm_aix.h"
39 #include "libperfstat_aix.hpp"
40 #include "loadlib_aix.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/filemap.hpp"
43 #include "mutex_aix.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "os_aix.inline.hpp"
46 #include "os_share_aix.hpp"
47 #include "porting_aix.hpp"
48 #include "prims/jniFastGetField.hpp"
49 #include "prims/jvm.h"
50 #include "prims/jvm_misc.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/atomic.inline.hpp"
53 #include "runtime/extendedPC.hpp"
54 #include "runtime/globals.hpp"
55 #include "runtime/interfaceSupport.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/mutexLocker.hpp"
59 #include "runtime/objectMonitor.hpp"
60 #include "runtime/orderAccess.inline.hpp"
61 #include "runtime/os.hpp"
62 #include "runtime/osThread.hpp"
63 #include "runtime/perfMemory.hpp"
64 #include "runtime/sharedRuntime.hpp"
65 #include "runtime/statSampler.hpp"
66 #include "runtime/stubRoutines.hpp"
67 #include "runtime/thread.inline.hpp"
68 #include "runtime/threadCritical.hpp"
69 #include "runtime/timer.hpp"
70 #include "runtime/vm_version.hpp"
71 #include "services/attachListener.hpp"
72 #include "services/runtimeService.hpp"
73 #include "utilities/decoder.hpp"
74 #include "utilities/defaultStream.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/growableArray.hpp"
77 #include "utilities/vmError.hpp"
78
79 // put OS-includes here (sorted alphabetically)
80 #include <errno.h>
81 #include <fcntl.h>
82 #include <inttypes.h>
83 #include <poll.h>
84 #include <procinfo.h>
85 #include <pthread.h>
86 #include <pwd.h>
87 #include <semaphore.h>
88 #include <signal.h>
89 #include <stdint.h>
90 #include <stdio.h>
91 #include <string.h>
92 #include <unistd.h>
93 #include <sys/ioctl.h>
94 #include <sys/ipc.h>
95 #include <sys/mman.h>
96 #include <sys/resource.h>
97 #include <sys/select.h>
98 #include <sys/shm.h>
99 #include <sys/socket.h>
100 #include <sys/stat.h>
101 #include <sys/sysinfo.h>
102 #include <sys/systemcfg.h>
103 #include <sys/time.h>
104 #include <sys/times.h>
105 #include <sys/types.h>
106 #include <sys/utsname.h>
107 #include <sys/vminfo.h>
108 #include <sys/wait.h>
109
110 // If RUSAGE_THREAD for getrusage() has not been defined, do it here. The code calling
111 // getrusage() is prepared to handle the associated failure.
112 #ifndef RUSAGE_THREAD
113 #define RUSAGE_THREAD (1) /* only the calling thread */
114 #endif
115
116 // PPC port
117 static const uintx Use64KPagesThreshold = 1*M;
118 static const uintx MaxExpectedDataSegmentSize = SIZE_4G*2;
119
120 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1).
121 #if !defined(_AIXVERSION_610)
122 extern "C" {
123 int getthrds64(pid_t ProcessIdentifier,
124 struct thrdentry64* ThreadBuffer,
125 int ThreadSize,
126 tid64_t* IndexPointer,
127 int Count);
128 }
129 #endif
130
131 #define MAX_PATH (2 * K)
132
133 // for timer info max values which include all bits
134 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
135 // for multipage initialization error analysis (in 'g_multipage_error')
136 #define ERROR_MP_OS_TOO_OLD 100
137 #define ERROR_MP_EXTSHM_ACTIVE 101
138 #define ERROR_MP_VMGETINFO_FAILED 102
139 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
140
141 // The semantics in this file are thus that codeptr_t is a *real code ptr*.
142 // This means that any function taking codeptr_t as arguments will assume
143 // a real codeptr and won't handle function descriptors (eg getFuncName),
144 // whereas functions taking address as args will deal with function
145 // descriptors (eg os::dll_address_to_library_name).
146 typedef unsigned int* codeptr_t;
147
148 // Typedefs for stackslots, stack pointers, pointers to op codes.
149 typedef unsigned long stackslot_t;
150 typedef stackslot_t* stackptr_t;
151
152 // Excerpts from systemcfg.h definitions newer than AIX 5.3.
153 #ifndef PV_7
154 #define PV_7 0x200000 /* Power PC 7 */
155 #define PV_7_Compat 0x208000 /* Power PC 7 */
156 #endif
157 #ifndef PV_8
158 #define PV_8 0x300000 /* Power PC 8 */
159 #define PV_8_Compat 0x308000 /* Power PC 8 */
160 #endif
161
162 #define trcVerbose(fmt, ...) { /* PPC port */ \
163 if (Verbose) { \
164 fprintf(stderr, fmt, ##__VA_ARGS__); \
165 fputc('\n', stderr); fflush(stderr); \
166 } \
167 }
168 #define trc(fmt, ...) /* PPC port */
169
170 #define ERRBYE(s) { \
171 trcVerbose(s); \
172 return -1; \
173 }
174
175 // Query dimensions of the stack of the calling thread.
176 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size);
177
178 // function to check a given stack pointer against given stack limits
179 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) {
180 if (((uintptr_t)sp) & 0x7) {
181 return false;
182 }
183 if (sp > stack_base) {
184 return false;
185 }
186 if (sp < (stackptr_t) ((address)stack_base - stack_size)) {
187 return false;
188 }
189 return true;
190 }
191
192 // returns true if function is a valid codepointer
193 inline bool is_valid_codepointer(codeptr_t p) {
194 if (!p) {
195 return false;
196 }
197 if (((uintptr_t)p) & 0x3) {
198 return false;
199 }
200 if (LoadedLibraries::find_for_text_address((address)p) == NULL) {
201 return false;
202 }
203 return true;
204 }
205
206 // Macro to check a given stack pointer against given stack limits and to die if test fails.
207 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \
208 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \
209 }
210
211 // Macro to check the current stack pointer against given stacklimits.
212 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \
213 address sp; \
214 sp = os::current_stack_pointer(); \
215 CHECK_STACK_PTR(sp, stack_base, stack_size); \
216 }
217
218 ////////////////////////////////////////////////////////////////////////////////
219 // global variables (for a description see os_aix.hpp)
220
221 julong os::Aix::_physical_memory = 0;
222 pthread_t os::Aix::_main_thread = ((pthread_t)0);
223 int os::Aix::_page_size = -1;
224 int os::Aix::_on_pase = -1;
225 int os::Aix::_os_version = -1;
226 int os::Aix::_stack_page_size = -1;
227 int os::Aix::_xpg_sus_mode = -1;
228 int os::Aix::_extshm = -1;
229 int os::Aix::_logical_cpus = -1;
230
231 ////////////////////////////////////////////////////////////////////////////////
232 // local variables
233
234 static int g_multipage_error = -1; // error analysis for multipage initialization
235 static jlong initial_time_count = 0;
236 static int clock_tics_per_sec = 100;
237 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
238 static bool check_signals = true;
239 static pid_t _initial_pid = 0;
240 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
241 static sigset_t SR_sigset;
242
243 // This describes the state of multipage support of the underlying
244 // OS. Note that this is of no interest to the outsize world and
245 // therefore should not be defined in AIX class.
246 //
247 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
248 // latter two (16M "large" resp. 16G "huge" pages) require special
249 // setup and are normally not available.
250 //
251 // AIX supports multiple page sizes per process, for:
252 // - Stack (of the primordial thread, so not relevant for us)
253 // - Data - data, bss, heap, for us also pthread stacks
254 // - Text - text code
255 // - shared memory
256 //
257 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
258 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
259 //
260 // For shared memory, page size can be set dynamically via
261 // shmctl(). Different shared memory regions can have different page
262 // sizes.
263 //
264 // More information can be found at AIBM info center:
265 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
266 //
267 static struct {
268 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
269 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
270 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
271 size_t pthr_stack_pagesize; // stack page size of pthread threads
272 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
273 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
274 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
275 int error; // Error describing if something went wrong at multipage init.
276 } g_multipage_support = {
277 (size_t) -1,
278 (size_t) -1,
279 (size_t) -1,
280 (size_t) -1,
281 (size_t) -1,
282 false, false,
283 0
284 };
285
286 // We must not accidentally allocate memory close to the BRK - even if
287 // that would work - because then we prevent the BRK segment from
288 // growing which may result in a malloc OOM even though there is
289 // enough memory. The problem only arises if we shmat() or mmap() at
290 // a specific wish address, e.g. to place the heap in a
291 // compressed-oops-friendly way.
292 static bool is_close_to_brk(address a) {
293 address a1 = (address) sbrk(0);
294 if (a >= a1 && a < (a1 + MaxExpectedDataSegmentSize)) {
295 return true;
296 }
297 return false;
298 }
299
300 julong os::available_memory() {
301 return Aix::available_memory();
302 }
303
304 julong os::Aix::available_memory() {
305 os::Aix::meminfo_t mi;
306 if (os::Aix::get_meminfo(&mi)) {
307 return mi.real_free;
308 } else {
309 return 0xFFFFFFFFFFFFFFFFLL;
310 }
311 }
312
313 julong os::physical_memory() {
314 return Aix::physical_memory();
315 }
316
317 // Return true if user is running as root.
318
319 bool os::have_special_privileges() {
320 static bool init = false;
321 static bool privileges = false;
322 if (!init) {
323 privileges = (getuid() != geteuid()) || (getgid() != getegid());
324 init = true;
325 }
326 return privileges;
327 }
328
329 // Helper function, emulates disclaim64 using multiple 32bit disclaims
330 // because we cannot use disclaim64() on AS/400 and old AIX releases.
331 static bool my_disclaim64(char* addr, size_t size) {
332
333 if (size == 0) {
334 return true;
335 }
336
337 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
338 const unsigned int maxDisclaimSize = 0x40000000;
339
340 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
341 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
342
343 char* p = addr;
344
345 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
346 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
347 trc("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
348 return false;
349 }
350 p += maxDisclaimSize;
351 }
352
353 if (lastDisclaimSize > 0) {
354 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
355 trc("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
356 return false;
357 }
358 }
359
360 return true;
361 }
362
363 // Cpu architecture string
364 #if defined(PPC32)
365 static char cpu_arch[] = "ppc";
366 #elif defined(PPC64)
367 static char cpu_arch[] = "ppc64";
368 #else
369 #error Add appropriate cpu_arch setting
370 #endif
371
372
373 // Given an address, returns the size of the page backing that address.
374 size_t os::Aix::query_pagesize(void* addr) {
375
376 vm_page_info pi;
377 pi.addr = (uint64_t)addr;
378 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
379 return pi.pagesize;
380 } else {
381 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno);
382 assert(false, "vmgetinfo failed to retrieve page size");
383 return SIZE_4K;
384 }
385
386 }
387
388 // Returns the kernel thread id of the currently running thread.
389 pid_t os::Aix::gettid() {
390 return (pid_t) thread_self();
391 }
392
393 void os::Aix::initialize_system_info() {
394
395 // Get the number of online(logical) cpus instead of configured.
396 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
397 assert(_processor_count > 0, "_processor_count must be > 0");
398
399 // Retrieve total physical storage.
400 os::Aix::meminfo_t mi;
401 if (!os::Aix::get_meminfo(&mi)) {
402 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr);
403 assert(false, "os::Aix::get_meminfo failed.");
404 }
405 _physical_memory = (julong) mi.real_total;
406 }
407
408 // Helper function for tracing page sizes.
409 static const char* describe_pagesize(size_t pagesize) {
410 switch (pagesize) {
411 case SIZE_4K : return "4K";
412 case SIZE_64K: return "64K";
413 case SIZE_16M: return "16M";
414 case SIZE_16G: return "16G";
415 case -1: return "not set";
416 default:
417 assert(false, "surprise");
418 return "??";
419 }
420 }
421
422 // Probe OS for multipage support.
423 // Will fill the global g_multipage_support structure.
424 // Must be called before calling os::large_page_init().
425 static void query_multipage_support() {
426
427 guarantee(g_multipage_support.pagesize == -1,
428 "do not call twice");
429
430 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
431
432 // This really would surprise me.
433 assert(g_multipage_support.pagesize == SIZE_4K, "surprise!");
434
435 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
436 // Default data page size is defined either by linker options (-bdatapsize)
437 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
438 // default should be 4K.
439 {
440 void* p = ::malloc(SIZE_16M);
441 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
442 ::free(p);
443 }
444
445 // Query default shm page size (LDR_CNTRL SHMPSIZE).
446 {
447 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
448 guarantee(shmid != -1, "shmget failed");
449 void* p = ::shmat(shmid, NULL, 0);
450 ::shmctl(shmid, IPC_RMID, NULL);
451 guarantee(p != (void*) -1, "shmat failed");
452 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
453 ::shmdt(p);
454 }
455
456 // Before querying the stack page size, make sure we are not running as primordial
457 // thread (because primordial thread's stack may have different page size than
458 // pthread thread stacks). Running a VM on the primordial thread won't work for a
459 // number of reasons so we may just as well guarantee it here.
460 guarantee0(!os::Aix::is_primordial_thread());
461
462 // Query pthread stack page size.
463 {
464 int dummy = 0;
465 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
466 }
467
468 // Query default text page size (LDR_CNTRL TEXTPSIZE).
469 /* PPC port: so far unused.
470 {
471 address any_function =
472 (address) resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
473 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
474 }
475 */
476
477 // Now probe for support of 64K pages and 16M pages.
478
479 // Before OS/400 V6R1, there is no support for pages other than 4K.
480 if (os::Aix::on_pase_V5R4_or_older()) {
481 Unimplemented();
482 goto query_multipage_support_end;
483 }
484
485 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
486 {
487 const int MAX_PAGE_SIZES = 4;
488 psize_t sizes[MAX_PAGE_SIZES];
489 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
490 if (num_psizes == -1) {
491 trc("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno);
492 trc("disabling multipage support.\n");
493 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
494 goto query_multipage_support_end;
495 }
496 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
497 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
498 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
499 for (int i = 0; i < num_psizes; i ++) {
500 trcVerbose(" %s ", describe_pagesize(sizes[i]));
501 }
502
503 // Can we use 64K, 16M pages?
504 for (int i = 0; i < num_psizes; i ++) {
505 const size_t pagesize = sizes[i];
506 if (pagesize != SIZE_64K && pagesize != SIZE_16M) {
507 continue;
508 }
509 bool can_use = false;
510 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
511 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
512 IPC_CREAT | S_IRUSR | S_IWUSR);
513 guarantee0(shmid != -1); // Should always work.
514 // Try to set pagesize.
515 struct shmid_ds shm_buf = { 0 };
516 shm_buf.shm_pagesize = pagesize;
517 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
518 const int en = errno;
519 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
520 // PPC port trcVerbose("shmctl(SHM_PAGESIZE) failed with %s",
521 // PPC port MiscUtils::describe_errno(en));
522 } else {
523 // Attach and double check pageisze.
524 void* p = ::shmat(shmid, NULL, 0);
525 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
526 guarantee0(p != (void*) -1); // Should always work.
527 const size_t real_pagesize = os::Aix::query_pagesize(p);
528 if (real_pagesize != pagesize) {
529 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
530 } else {
531 can_use = true;
532 }
533 ::shmdt(p);
534 }
535 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
536 if (pagesize == SIZE_64K) {
537 g_multipage_support.can_use_64K_pages = can_use;
538 } else if (pagesize == SIZE_16M) {
539 g_multipage_support.can_use_16M_pages = can_use;
540 }
541 }
542
543 } // end: check which pages can be used for shared memory
544
545 query_multipage_support_end:
546
547 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s\n",
548 describe_pagesize(g_multipage_support.pagesize));
549 trcVerbose("Data page size (C-Heap, bss, etc): %s\n",
550 describe_pagesize(g_multipage_support.datapsize));
551 trcVerbose("Text page size: %s\n",
552 describe_pagesize(g_multipage_support.textpsize));
553 trcVerbose("Thread stack page size (pthread): %s\n",
554 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
555 trcVerbose("Default shared memory page size: %s\n",
556 describe_pagesize(g_multipage_support.shmpsize));
557 trcVerbose("Can use 64K pages dynamically with shared meory: %s\n",
558 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
559 trcVerbose("Can use 16M pages dynamically with shared memory: %s\n",
560 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
561 trcVerbose("Multipage error details: %d\n",
562 g_multipage_support.error);
563
564 // sanity checks
565 assert0(g_multipage_support.pagesize == SIZE_4K);
566 assert0(g_multipage_support.datapsize == SIZE_4K || g_multipage_support.datapsize == SIZE_64K);
567 // PPC port: so far unused.assert0(g_multipage_support.textpsize == SIZE_4K || g_multipage_support.textpsize == SIZE_64K);
568 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
569 assert0(g_multipage_support.shmpsize == SIZE_4K || g_multipage_support.shmpsize == SIZE_64K);
570
571 } // end os::Aix::query_multipage_support()
572
573 void os::init_system_properties_values() {
574
575 #define DEFAULT_LIBPATH "/usr/lib:/lib"
576 #define EXTENSIONS_DIR "/lib/ext"
577
578 // Buffer that fits several sprintfs.
579 // Note that the space for the trailing null is provided
580 // by the nulls included by the sizeof operator.
581 const size_t bufsize =
582 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
583 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
584 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
585
586 // sysclasspath, java_home, dll_dir
587 {
588 char *pslash;
589 os::jvm_path(buf, bufsize);
590
591 // Found the full path to libjvm.so.
592 // Now cut the path to <java_home>/jre if we can.
593 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so.
594 pslash = strrchr(buf, '/');
595 if (pslash != NULL) {
596 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
597 }
598 Arguments::set_dll_dir(buf);
599
600 if (pslash != NULL) {
601 pslash = strrchr(buf, '/');
602 if (pslash != NULL) {
603 *pslash = '\0'; // Get rid of /<arch>.
604 pslash = strrchr(buf, '/');
605 if (pslash != NULL) {
606 *pslash = '\0'; // Get rid of /lib.
607 }
608 }
609 }
610 Arguments::set_java_home(buf);
611 set_boot_path('/', ':');
612 }
613
614 // Where to look for native libraries.
615
616 // On Aix we get the user setting of LIBPATH.
617 // Eventually, all the library path setting will be done here.
618 // Get the user setting of LIBPATH.
619 const char *v = ::getenv("LIBPATH");
620 const char *v_colon = ":";
621 if (v == NULL) { v = ""; v_colon = ""; }
622
623 // Concatenate user and invariant part of ld_library_path.
624 // That's +1 for the colon and +1 for the trailing '\0'.
625 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
626 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
627 Arguments::set_library_path(ld_library_path);
628 FREE_C_HEAP_ARRAY(char, ld_library_path);
629
630 // Extensions directories.
631 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
632 Arguments::set_ext_dirs(buf);
633
634 FREE_C_HEAP_ARRAY(char, buf);
635
636 #undef DEFAULT_LIBPATH
637 #undef EXTENSIONS_DIR
638 }
639
640 ////////////////////////////////////////////////////////////////////////////////
641 // breakpoint support
642
643 void os::breakpoint() {
644 BREAKPOINT;
645 }
646
647 extern "C" void breakpoint() {
648 // use debugger to set breakpoint here
649 }
650
651 ////////////////////////////////////////////////////////////////////////////////
652 // signal support
653
654 debug_only(static bool signal_sets_initialized = false);
655 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
656
657 bool os::Aix::is_sig_ignored(int sig) {
658 struct sigaction oact;
659 sigaction(sig, (struct sigaction*)NULL, &oact);
660 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
661 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
662 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
663 return true;
664 } else {
665 return false;
666 }
667 }
668
669 void os::Aix::signal_sets_init() {
670 // Should also have an assertion stating we are still single-threaded.
671 assert(!signal_sets_initialized, "Already initialized");
672 // Fill in signals that are necessarily unblocked for all threads in
673 // the VM. Currently, we unblock the following signals:
674 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
675 // by -Xrs (=ReduceSignalUsage));
676 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
677 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
678 // the dispositions or masks wrt these signals.
679 // Programs embedding the VM that want to use the above signals for their
680 // own purposes must, at this time, use the "-Xrs" option to prevent
681 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
682 // (See bug 4345157, and other related bugs).
683 // In reality, though, unblocking these signals is really a nop, since
684 // these signals are not blocked by default.
685 sigemptyset(&unblocked_sigs);
686 sigemptyset(&allowdebug_blocked_sigs);
687 sigaddset(&unblocked_sigs, SIGILL);
688 sigaddset(&unblocked_sigs, SIGSEGV);
689 sigaddset(&unblocked_sigs, SIGBUS);
690 sigaddset(&unblocked_sigs, SIGFPE);
691 sigaddset(&unblocked_sigs, SIGTRAP);
692 sigaddset(&unblocked_sigs, SIGDANGER);
693 sigaddset(&unblocked_sigs, SR_signum);
694
695 if (!ReduceSignalUsage) {
696 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
697 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
698 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
699 }
700 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
701 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
702 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
703 }
704 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
705 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
706 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
707 }
708 }
709 // Fill in signals that are blocked by all but the VM thread.
710 sigemptyset(&vm_sigs);
711 if (!ReduceSignalUsage)
712 sigaddset(&vm_sigs, BREAK_SIGNAL);
713 debug_only(signal_sets_initialized = true);
714 }
715
716 // These are signals that are unblocked while a thread is running Java.
717 // (For some reason, they get blocked by default.)
718 sigset_t* os::Aix::unblocked_signals() {
719 assert(signal_sets_initialized, "Not initialized");
720 return &unblocked_sigs;
721 }
722
723 // These are the signals that are blocked while a (non-VM) thread is
724 // running Java. Only the VM thread handles these signals.
725 sigset_t* os::Aix::vm_signals() {
726 assert(signal_sets_initialized, "Not initialized");
727 return &vm_sigs;
728 }
729
730 // These are signals that are blocked during cond_wait to allow debugger in
731 sigset_t* os::Aix::allowdebug_blocked_signals() {
732 assert(signal_sets_initialized, "Not initialized");
733 return &allowdebug_blocked_sigs;
734 }
735
736 void os::Aix::hotspot_sigmask(Thread* thread) {
737
738 //Save caller's signal mask before setting VM signal mask
739 sigset_t caller_sigmask;
740 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
741
742 OSThread* osthread = thread->osthread();
743 osthread->set_caller_sigmask(caller_sigmask);
744
745 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
746
747 if (!ReduceSignalUsage) {
748 if (thread->is_VM_thread()) {
749 // Only the VM thread handles BREAK_SIGNAL ...
750 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
751 } else {
752 // ... all other threads block BREAK_SIGNAL
753 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
754 }
755 }
756 }
757
758 // retrieve memory information.
759 // Returns false if something went wrong;
760 // content of pmi undefined in this case.
761 bool os::Aix::get_meminfo(meminfo_t* pmi) {
762
763 assert(pmi, "get_meminfo: invalid parameter");
764
765 memset(pmi, 0, sizeof(meminfo_t));
766
767 if (os::Aix::on_pase()) {
768
769 Unimplemented();
770 return false;
771
772 } else {
773
774 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
775 // See:
776 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
777 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
778 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
779 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
780
781 perfstat_memory_total_t psmt;
782 memset (&psmt, '\0', sizeof(psmt));
783 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
784 if (rc == -1) {
785 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno);
786 assert(0, "perfstat_memory_total() failed");
787 return false;
788 }
789
790 assert(rc == 1, "perfstat_memory_total() - weird return code");
791
792 // excerpt from
793 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
794 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
795 // The fields of perfstat_memory_total_t:
796 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
797 // u_longlong_t real_total Total real memory (in 4 KB pages).
798 // u_longlong_t real_free Free real memory (in 4 KB pages).
799 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
800 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
801
802 pmi->virt_total = psmt.virt_total * 4096;
803 pmi->real_total = psmt.real_total * 4096;
804 pmi->real_free = psmt.real_free * 4096;
805 pmi->pgsp_total = psmt.pgsp_total * 4096;
806 pmi->pgsp_free = psmt.pgsp_free * 4096;
807
808 return true;
809
810 }
811 } // end os::Aix::get_meminfo
812
813 // Retrieve global cpu information.
814 // Returns false if something went wrong;
815 // the content of pci is undefined in this case.
816 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) {
817 assert(pci, "get_cpuinfo: invalid parameter");
818 memset(pci, 0, sizeof(cpuinfo_t));
819
820 perfstat_cpu_total_t psct;
821 memset (&psct, '\0', sizeof(psct));
822
823 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) {
824 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno);
825 assert(0, "perfstat_cpu_total() failed");
826 return false;
827 }
828
829 // global cpu information
830 strcpy (pci->description, psct.description);
831 pci->processorHZ = psct.processorHZ;
832 pci->ncpus = psct.ncpus;
833 os::Aix::_logical_cpus = psct.ncpus;
834 for (int i = 0; i < 3; i++) {
835 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS);
836 }
837
838 // get the processor version from _system_configuration
839 switch (_system_configuration.version) {
840 case PV_8:
841 strcpy(pci->version, "Power PC 8");
842 break;
843 case PV_7:
844 strcpy(pci->version, "Power PC 7");
845 break;
846 case PV_6_1:
847 strcpy(pci->version, "Power PC 6 DD1.x");
848 break;
849 case PV_6:
850 strcpy(pci->version, "Power PC 6");
851 break;
852 case PV_5:
853 strcpy(pci->version, "Power PC 5");
854 break;
855 case PV_5_2:
856 strcpy(pci->version, "Power PC 5_2");
857 break;
858 case PV_5_3:
859 strcpy(pci->version, "Power PC 5_3");
860 break;
861 case PV_5_Compat:
862 strcpy(pci->version, "PV_5_Compat");
863 break;
864 case PV_6_Compat:
865 strcpy(pci->version, "PV_6_Compat");
866 break;
867 case PV_7_Compat:
868 strcpy(pci->version, "PV_7_Compat");
869 break;
870 case PV_8_Compat:
871 strcpy(pci->version, "PV_8_Compat");
872 break;
873 default:
874 strcpy(pci->version, "unknown");
875 }
876
877 return true;
878
879 } //end os::Aix::get_cpuinfo
880
881 //////////////////////////////////////////////////////////////////////////////
882 // detecting pthread library
883
884 void os::Aix::libpthread_init() {
885 return;
886 }
887
888 //////////////////////////////////////////////////////////////////////////////
889 // create new thread
890
891 // Thread start routine for all newly created threads
892 static void *java_start(Thread *thread) {
893
894 // find out my own stack dimensions
895 {
896 // actually, this should do exactly the same as thread->record_stack_base_and_size...
897 address base = 0;
898 size_t size = 0;
899 query_stack_dimensions(&base, &size);
900 thread->set_stack_base(base);
901 thread->set_stack_size(size);
902 }
903
904 // Do some sanity checks.
905 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
906
907 // Try to randomize the cache line index of hot stack frames.
908 // This helps when threads of the same stack traces evict each other's
909 // cache lines. The threads can be either from the same JVM instance, or
910 // from different JVM instances. The benefit is especially true for
911 // processors with hyperthreading technology.
912
913 static int counter = 0;
914 int pid = os::current_process_id();
915 alloca(((pid ^ counter++) & 7) * 128);
916
917 ThreadLocalStorage::set_thread(thread);
918
919 OSThread* osthread = thread->osthread();
920
921 // thread_id is kernel thread id (similar to Solaris LWP id)
922 osthread->set_thread_id(os::Aix::gettid());
923
924 // initialize signal mask for this thread
925 os::Aix::hotspot_sigmask(thread);
926
927 // initialize floating point control register
928 os::Aix::init_thread_fpu_state();
929
930 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
931
932 // call one more level start routine
933 thread->run();
934
935 return 0;
936 }
937
938 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
939
940 // We want the whole function to be synchronized.
941 ThreadCritical cs;
942
943 assert(thread->osthread() == NULL, "caller responsible");
944
945 // Allocate the OSThread object
946 OSThread* osthread = new OSThread(NULL, NULL);
947 if (osthread == NULL) {
948 return false;
949 }
950
951 // set the correct thread state
952 osthread->set_thread_type(thr_type);
953
954 // Initial state is ALLOCATED but not INITIALIZED
955 osthread->set_state(ALLOCATED);
956
957 thread->set_osthread(osthread);
958
959 // init thread attributes
960 pthread_attr_t attr;
961 pthread_attr_init(&attr);
962 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
963
964 // Make sure we run in 1:1 kernel-user-thread mode.
965 if (os::Aix::on_aix()) {
966 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
967 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
968 } // end: aix
969
970 // Start in suspended state, and in os::thread_start, wake the thread up.
971 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
972
973 // calculate stack size if it's not specified by caller
974 if (os::Aix::supports_variable_stack_size()) {
975 if (stack_size == 0) {
976 stack_size = os::Aix::default_stack_size(thr_type);
977
978 switch (thr_type) {
979 case os::java_thread:
980 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss.
981 assert(JavaThread::stack_size_at_create() > 0, "this should be set");
982 stack_size = JavaThread::stack_size_at_create();
983 break;
984 case os::compiler_thread:
985 if (CompilerThreadStackSize > 0) {
986 stack_size = (size_t)(CompilerThreadStackSize * K);
987 break;
988 } // else fall through:
989 // use VMThreadStackSize if CompilerThreadStackSize is not defined
990 case os::vm_thread:
991 case os::pgc_thread:
992 case os::cgc_thread:
993 case os::watcher_thread:
994 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
995 break;
996 }
997 }
998
999 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed);
1000 pthread_attr_setstacksize(&attr, stack_size);
1001 } //else let thread_create() pick the default value (96 K on AIX)
1002
1003 pthread_t tid;
1004 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
1005
1006 pthread_attr_destroy(&attr);
1007
1008 if (ret == 0) {
1009 // PPC port traceOsMisc(("Created New Thread : pthread-id %u", tid));
1010 } else {
1011 if (PrintMiscellaneous && (Verbose || WizardMode)) {
1012 perror("pthread_create()");
1013 }
1014 // Need to clean up stuff we've allocated so far
1015 thread->set_osthread(NULL);
1016 delete osthread;
1017 return false;
1018 }
1019
1020 // Store pthread info into the OSThread
1021 osthread->set_pthread_id(tid);
1022
1023 return true;
1024 }
1025
1026 /////////////////////////////////////////////////////////////////////////////
1027 // attach existing thread
1028
1029 // bootstrap the main thread
1030 bool os::create_main_thread(JavaThread* thread) {
1031 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
1032 return create_attached_thread(thread);
1033 }
1034
1035 bool os::create_attached_thread(JavaThread* thread) {
1036 #ifdef ASSERT
1037 thread->verify_not_published();
1038 #endif
1039
1040 // Allocate the OSThread object
1041 OSThread* osthread = new OSThread(NULL, NULL);
1042
1043 if (osthread == NULL) {
1044 return false;
1045 }
1046
1047 // Store pthread info into the OSThread
1048 osthread->set_thread_id(os::Aix::gettid());
1049 osthread->set_pthread_id(::pthread_self());
1050
1051 // initialize floating point control register
1052 os::Aix::init_thread_fpu_state();
1053
1054 // some sanity checks
1055 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size());
1056
1057 // Initial thread state is RUNNABLE
1058 osthread->set_state(RUNNABLE);
1059
1060 thread->set_osthread(osthread);
1061
1062 if (UseNUMA) {
1063 int lgrp_id = os::numa_get_group_id();
1064 if (lgrp_id != -1) {
1065 thread->set_lgrp_id(lgrp_id);
1066 }
1067 }
1068
1069 // initialize signal mask for this thread
1070 // and save the caller's signal mask
1071 os::Aix::hotspot_sigmask(thread);
1072
1073 return true;
1074 }
1075
1076 void os::pd_start_thread(Thread* thread) {
1077 int status = pthread_continue_np(thread->osthread()->pthread_id());
1078 assert(status == 0, "thr_continue failed");
1079 }
1080
1081 // Free OS resources related to the OSThread
1082 void os::free_thread(OSThread* osthread) {
1083 assert(osthread != NULL, "osthread not set");
1084
1085 if (Thread::current()->osthread() == osthread) {
1086 // Restore caller's signal mask
1087 sigset_t sigmask = osthread->caller_sigmask();
1088 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1089 }
1090
1091 delete osthread;
1092 }
1093
1094 //////////////////////////////////////////////////////////////////////////////
1095 // thread local storage
1096
1097 int os::allocate_thread_local_storage() {
1098 pthread_key_t key;
1099 int rslt = pthread_key_create(&key, NULL);
1100 assert(rslt == 0, "cannot allocate thread local storage");
1101 return (int)key;
1102 }
1103
1104 // Note: This is currently not used by VM, as we don't destroy TLS key
1105 // on VM exit.
1106 void os::free_thread_local_storage(int index) {
1107 int rslt = pthread_key_delete((pthread_key_t)index);
1108 assert(rslt == 0, "invalid index");
1109 }
1110
1111 void os::thread_local_storage_at_put(int index, void* value) {
1112 int rslt = pthread_setspecific((pthread_key_t)index, value);
1113 assert(rslt == 0, "pthread_setspecific failed");
1114 }
1115
1116 extern "C" Thread* get_thread() {
1117 return ThreadLocalStorage::thread();
1118 }
1119
1120 ////////////////////////////////////////////////////////////////////////////////
1121 // time support
1122
1123 // Time since start-up in seconds to a fine granularity.
1124 // Used by VMSelfDestructTimer and the MemProfiler.
1125 double os::elapsedTime() {
1126 return (double)(os::elapsed_counter()) * 0.000001;
1127 }
1128
1129 jlong os::elapsed_counter() {
1130 timeval time;
1131 int status = gettimeofday(&time, NULL);
1132 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1133 }
1134
1135 jlong os::elapsed_frequency() {
1136 return (1000 * 1000);
1137 }
1138
1139 bool os::supports_vtime() { return true; }
1140 bool os::enable_vtime() { return false; }
1141 bool os::vtime_enabled() { return false; }
1142
1143 double os::elapsedVTime() {
1144 struct rusage usage;
1145 int retval = getrusage(RUSAGE_THREAD, &usage);
1146 if (retval == 0) {
1147 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1148 } else {
1149 // better than nothing, but not much
1150 return elapsedTime();
1151 }
1152 }
1153
1154 jlong os::javaTimeMillis() {
1155 timeval time;
1156 int status = gettimeofday(&time, NULL);
1157 assert(status != -1, "aix error at gettimeofday()");
1158 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1159 }
1160
1161 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1162 timeval time;
1163 int status = gettimeofday(&time, NULL);
1164 assert(status != -1, "aix error at gettimeofday()");
1165 seconds = jlong(time.tv_sec);
1166 nanos = jlong(time.tv_usec) * 1000;
1167 }
1168
1169
1170 // We need to manually declare mread_real_time,
1171 // because IBM didn't provide a prototype in time.h.
1172 // (they probably only ever tested in C, not C++)
1173 extern "C"
1174 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
1175
1176 jlong os::javaTimeNanos() {
1177 if (os::Aix::on_pase()) {
1178 Unimplemented();
1179 return 0;
1180 } else {
1181 // On AIX use the precision of processors real time clock
1182 // or time base registers.
1183 timebasestruct_t time;
1184 int rc;
1185
1186 // If the CPU has a time register, it will be used and
1187 // we have to convert to real time first. After convertion we have following data:
1188 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1189 // time.tb_low [nanoseconds after the last full second above]
1190 // We better use mread_real_time here instead of read_real_time
1191 // to ensure that we will get a monotonic increasing time.
1192 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1193 rc = time_base_to_time(&time, TIMEBASE_SZ);
1194 assert(rc != -1, "aix error at time_base_to_time()");
1195 }
1196 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1197 }
1198 }
1199
1200 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1201 info_ptr->max_value = ALL_64_BITS;
1202 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1203 info_ptr->may_skip_backward = false;
1204 info_ptr->may_skip_forward = false;
1205 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1206 }
1207
1208 // Return the real, user, and system times in seconds from an
1209 // arbitrary fixed point in the past.
1210 bool os::getTimesSecs(double* process_real_time,
1211 double* process_user_time,
1212 double* process_system_time) {
1213 struct tms ticks;
1214 clock_t real_ticks = times(&ticks);
1215
1216 if (real_ticks == (clock_t) (-1)) {
1217 return false;
1218 } else {
1219 double ticks_per_second = (double) clock_tics_per_sec;
1220 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1221 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1222 *process_real_time = ((double) real_ticks) / ticks_per_second;
1223
1224 return true;
1225 }
1226 }
1227
1228 char * os::local_time_string(char *buf, size_t buflen) {
1229 struct tm t;
1230 time_t long_time;
1231 time(&long_time);
1232 localtime_r(&long_time, &t);
1233 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1234 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1235 t.tm_hour, t.tm_min, t.tm_sec);
1236 return buf;
1237 }
1238
1239 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1240 return localtime_r(clock, res);
1241 }
1242
1243 ////////////////////////////////////////////////////////////////////////////////
1244 // runtime exit support
1245
1246 // Note: os::shutdown() might be called very early during initialization, or
1247 // called from signal handler. Before adding something to os::shutdown(), make
1248 // sure it is async-safe and can handle partially initialized VM.
1249 void os::shutdown() {
1250
1251 // allow PerfMemory to attempt cleanup of any persistent resources
1252 perfMemory_exit();
1253
1254 // needs to remove object in file system
1255 AttachListener::abort();
1256
1257 // flush buffered output, finish log files
1258 ostream_abort();
1259
1260 // Check for abort hook
1261 abort_hook_t abort_hook = Arguments::abort_hook();
1262 if (abort_hook != NULL) {
1263 abort_hook();
1264 }
1265 }
1266
1267 // Note: os::abort() might be called very early during initialization, or
1268 // called from signal handler. Before adding something to os::abort(), make
1269 // sure it is async-safe and can handle partially initialized VM.
1270 void os::abort(bool dump_core, void* siginfo, void* context) {
1271 os::shutdown();
1272 if (dump_core) {
1273 #ifndef PRODUCT
1274 fdStream out(defaultStream::output_fd());
1275 out.print_raw("Current thread is ");
1276 char buf[16];
1277 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1278 out.print_raw_cr(buf);
1279 out.print_raw_cr("Dumping core ...");
1280 #endif
1281 ::abort(); // dump core
1282 }
1283
1284 ::exit(1);
1285 }
1286
1287 // Die immediately, no exit hook, no abort hook, no cleanup.
1288 void os::die() {
1289 ::abort();
1290 }
1291
1292 // This method is a copy of JDK's sysGetLastErrorString
1293 // from src/solaris/hpi/src/system_md.c
1294
1295 size_t os::lasterror(char *buf, size_t len) {
1296 if (errno == 0) return 0;
1297
1298 const char *s = ::strerror(errno);
1299 size_t n = ::strlen(s);
1300 if (n >= len) {
1301 n = len - 1;
1302 }
1303 ::strncpy(buf, s, n);
1304 buf[n] = '\0';
1305 return n;
1306 }
1307
1308 intx os::current_thread_id() { return (intx)pthread_self(); }
1309
1310 int os::current_process_id() {
1311
1312 // This implementation returns a unique pid, the pid of the
1313 // launcher thread that starts the vm 'process'.
1314
1315 // Under POSIX, getpid() returns the same pid as the
1316 // launcher thread rather than a unique pid per thread.
1317 // Use gettid() if you want the old pre NPTL behaviour.
1318
1319 // if you are looking for the result of a call to getpid() that
1320 // returns a unique pid for the calling thread, then look at the
1321 // OSThread::thread_id() method in osThread_linux.hpp file
1322
1323 return (int)(_initial_pid ? _initial_pid : getpid());
1324 }
1325
1326 // DLL functions
1327
1328 const char* os::dll_file_extension() { return ".so"; }
1329
1330 // This must be hard coded because it's the system's temporary
1331 // directory not the java application's temp directory, ala java.io.tmpdir.
1332 const char* os::get_temp_directory() { return "/tmp"; }
1333
1334 static bool file_exists(const char* filename) {
1335 struct stat statbuf;
1336 if (filename == NULL || strlen(filename) == 0) {
1337 return false;
1338 }
1339 return os::stat(filename, &statbuf) == 0;
1340 }
1341
1342 bool os::dll_build_name(char* buffer, size_t buflen,
1343 const char* pname, const char* fname) {
1344 bool retval = false;
1345 // Copied from libhpi
1346 const size_t pnamelen = pname ? strlen(pname) : 0;
1347
1348 // Return error on buffer overflow.
1349 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1350 *buffer = '\0';
1351 return retval;
1352 }
1353
1354 if (pnamelen == 0) {
1355 snprintf(buffer, buflen, "lib%s.so", fname);
1356 retval = true;
1357 } else if (strchr(pname, *os::path_separator()) != NULL) {
1358 int n;
1359 char** pelements = split_path(pname, &n);
1360 for (int i = 0; i < n; i++) {
1361 // Really shouldn't be NULL, but check can't hurt
1362 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1363 continue; // skip the empty path values
1364 }
1365 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1366 if (file_exists(buffer)) {
1367 retval = true;
1368 break;
1369 }
1370 }
1371 // release the storage
1372 for (int i = 0; i < n; i++) {
1373 if (pelements[i] != NULL) {
1374 FREE_C_HEAP_ARRAY(char, pelements[i]);
1375 }
1376 }
1377 if (pelements != NULL) {
1378 FREE_C_HEAP_ARRAY(char*, pelements);
1379 }
1380 } else {
1381 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1382 retval = true;
1383 }
1384 return retval;
1385 }
1386
1387 // Check if addr is inside libjvm.so.
1388 bool os::address_is_in_vm(address addr) {
1389
1390 // Input could be a real pc or a function pointer literal. The latter
1391 // would be a function descriptor residing in the data segment of a module.
1392
1393 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
1394 if (lib) {
1395 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1396 return true;
1397 } else {
1398 return false;
1399 }
1400 } else {
1401 lib = LoadedLibraries::find_for_data_address(addr);
1402 if (lib) {
1403 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) {
1404 return true;
1405 } else {
1406 return false;
1407 }
1408 } else {
1409 return false;
1410 }
1411 }
1412 }
1413
1414 // Resolve an AIX function descriptor literal to a code pointer.
1415 // If the input is a valid code pointer to a text segment of a loaded module,
1416 // it is returned unchanged.
1417 // If the input is a valid AIX function descriptor, it is resolved to the
1418 // code entry point.
1419 // If the input is neither a valid function descriptor nor a valid code pointer,
1420 // NULL is returned.
1421 static address resolve_function_descriptor_to_code_pointer(address p) {
1422
1423 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p);
1424 if (lib) {
1425 // its a real code pointer
1426 return p;
1427 } else {
1428 lib = LoadedLibraries::find_for_data_address(p);
1429 if (lib) {
1430 // pointer to data segment, potential function descriptor
1431 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1432 if (LoadedLibraries::find_for_text_address(code_entry)) {
1433 // Its a function descriptor
1434 return code_entry;
1435 }
1436 }
1437 }
1438 return NULL;
1439 }
1440
1441 bool os::dll_address_to_function_name(address addr, char *buf,
1442 int buflen, int *offset,
1443 bool demangle) {
1444 if (offset) {
1445 *offset = -1;
1446 }
1447 // Buf is not optional, but offset is optional.
1448 assert(buf != NULL, "sanity check");
1449 buf[0] = '\0';
1450
1451 // Resolve function ptr literals first.
1452 addr = resolve_function_descriptor_to_code_pointer(addr);
1453 if (!addr) {
1454 return false;
1455 }
1456
1457 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table.
1458 return Decoder::decode(addr, buf, buflen, offset, demangle);
1459 }
1460
1461 static int getModuleName(codeptr_t pc, // [in] program counter
1462 char* p_name, size_t namelen, // [out] optional: function name
1463 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1464 ) {
1465
1466 // initialize output parameters
1467 if (p_name && namelen > 0) {
1468 *p_name = '\0';
1469 }
1470 if (p_errmsg && errmsglen > 0) {
1471 *p_errmsg = '\0';
1472 }
1473
1474 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc);
1475 if (lib) {
1476 if (p_name && namelen > 0) {
1477 sprintf(p_name, "%.*s", namelen, lib->get_shortname());
1478 }
1479 return 0;
1480 }
1481
1482 trcVerbose("pc outside any module");
1483
1484 return -1;
1485 }
1486
1487 bool os::dll_address_to_library_name(address addr, char* buf,
1488 int buflen, int* offset) {
1489 if (offset) {
1490 *offset = -1;
1491 }
1492 // Buf is not optional, but offset is optional.
1493 assert(buf != NULL, "sanity check");
1494 buf[0] = '\0';
1495
1496 // Resolve function ptr literals first.
1497 addr = resolve_function_descriptor_to_code_pointer(addr);
1498 if (!addr) {
1499 return false;
1500 }
1501
1502 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) {
1503 return true;
1504 }
1505 return false;
1506 }
1507
1508 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1509 // for the same architecture as Hotspot is running on.
1510 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1511
1512 if (ebuf && ebuflen > 0) {
1513 ebuf[0] = '\0';
1514 ebuf[ebuflen - 1] = '\0';
1515 }
1516
1517 if (!filename || strlen(filename) == 0) {
1518 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1519 return NULL;
1520 }
1521
1522 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1523 void * result= ::dlopen(filename, RTLD_LAZY);
1524 if (result != NULL) {
1525 // Reload dll cache. Don't do this in signal handling.
1526 LoadedLibraries::reload();
1527 return result;
1528 } else {
1529 // error analysis when dlopen fails
1530 const char* const error_report = ::dlerror();
1531 if (error_report && ebuf && ebuflen > 0) {
1532 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1533 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1534 }
1535 }
1536 return NULL;
1537 }
1538
1539 void* os::dll_lookup(void* handle, const char* name) {
1540 void* res = dlsym(handle, name);
1541 return res;
1542 }
1543
1544 void* os::get_default_process_handle() {
1545 return (void*)::dlopen(NULL, RTLD_LAZY);
1546 }
1547
1548 void os::print_dll_info(outputStream *st) {
1549 st->print_cr("Dynamic libraries:");
1550 LoadedLibraries::print(st);
1551 }
1552
1553 void os::get_summary_os_info(char* buf, size_t buflen) {
1554 // There might be something more readable than uname results for AIX.
1555 struct utsname name;
1556 uname(&name);
1557 snprintf(buf, buflen, "%s %s", name.release, name.version);
1558 }
1559
1560 void os::print_os_info(outputStream* st) {
1561 st->print("OS:");
1562
1563 st->print("uname:");
1564 struct utsname name;
1565 uname(&name);
1566 st->print(name.sysname); st->print(" ");
1567 st->print(name.nodename); st->print(" ");
1568 st->print(name.release); st->print(" ");
1569 st->print(name.version); st->print(" ");
1570 st->print(name.machine);
1571 st->cr();
1572
1573 // rlimit
1574 st->print("rlimit:");
1575 struct rlimit rlim;
1576
1577 st->print(" STACK ");
1578 getrlimit(RLIMIT_STACK, &rlim);
1579 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1580 else st->print("%uk", rlim.rlim_cur >> 10);
1581
1582 st->print(", CORE ");
1583 getrlimit(RLIMIT_CORE, &rlim);
1584 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1585 else st->print("%uk", rlim.rlim_cur >> 10);
1586
1587 st->print(", NPROC ");
1588 st->print("%d", sysconf(_SC_CHILD_MAX));
1589
1590 st->print(", NOFILE ");
1591 getrlimit(RLIMIT_NOFILE, &rlim);
1592 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1593 else st->print("%d", rlim.rlim_cur);
1594
1595 st->print(", AS ");
1596 getrlimit(RLIMIT_AS, &rlim);
1597 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1598 else st->print("%uk", rlim.rlim_cur >> 10);
1599
1600 // Print limits on DATA, because it limits the C-heap.
1601 st->print(", DATA ");
1602 getrlimit(RLIMIT_DATA, &rlim);
1603 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity");
1604 else st->print("%uk", rlim.rlim_cur >> 10);
1605 st->cr();
1606
1607 // load average
1608 st->print("load average:");
1609 double loadavg[3] = {-1.L, -1.L, -1.L};
1610 os::loadavg(loadavg, 3);
1611 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1612 st->cr();
1613 }
1614
1615 void os::print_memory_info(outputStream* st) {
1616
1617 st->print_cr("Memory:");
1618
1619 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size()));
1620 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size()));
1621 st->print_cr(" Default shared memory page size: %s",
1622 describe_pagesize(g_multipage_support.shmpsize));
1623 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1624 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1625 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1626 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1627 if (g_multipage_error != 0) {
1628 st->print_cr(" multipage error: %d", g_multipage_error);
1629 }
1630
1631 // print out LDR_CNTRL because it affects the default page sizes
1632 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1633 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1634
1635 const char* const extshm = ::getenv("EXTSHM");
1636 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1637 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1638 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1639 }
1640
1641 // Call os::Aix::get_meminfo() to retrieve memory statistics.
1642 os::Aix::meminfo_t mi;
1643 if (os::Aix::get_meminfo(&mi)) {
1644 char buffer[256];
1645 if (os::Aix::on_aix()) {
1646 jio_snprintf(buffer, sizeof(buffer),
1647 " physical total : %llu\n"
1648 " physical free : %llu\n"
1649 " swap total : %llu\n"
1650 " swap free : %llu\n",
1651 mi.real_total,
1652 mi.real_free,
1653 mi.pgsp_total,
1654 mi.pgsp_free);
1655 } else {
1656 Unimplemented();
1657 }
1658 st->print_raw(buffer);
1659 } else {
1660 st->print_cr(" (no more information available)");
1661 }
1662 }
1663
1664 // Get a string for the cpuinfo that is a summary of the cpu type
1665 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1666 // This looks good
1667 os::Aix::cpuinfo_t ci;
1668 if (os::Aix::get_cpuinfo(&ci)) {
1669 strncpy(buf, ci.version, buflen);
1670 } else {
1671 strncpy(buf, "AIX", buflen);
1672 }
1673 }
1674
1675 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1676 }
1677
1678 void os::print_siginfo(outputStream* st, void* siginfo) {
1679 // Use common posix version.
1680 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo);
1681 st->cr();
1682 }
1683
1684 static void print_signal_handler(outputStream* st, int sig,
1685 char* buf, size_t buflen);
1686
1687 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1688 st->print_cr("Signal Handlers:");
1689 print_signal_handler(st, SIGSEGV, buf, buflen);
1690 print_signal_handler(st, SIGBUS , buf, buflen);
1691 print_signal_handler(st, SIGFPE , buf, buflen);
1692 print_signal_handler(st, SIGPIPE, buf, buflen);
1693 print_signal_handler(st, SIGXFSZ, buf, buflen);
1694 print_signal_handler(st, SIGILL , buf, buflen);
1695 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
1696 print_signal_handler(st, SR_signum, buf, buflen);
1697 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1698 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1699 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1700 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1701 print_signal_handler(st, SIGTRAP, buf, buflen);
1702 print_signal_handler(st, SIGDANGER, buf, buflen);
1703 }
1704
1705 static char saved_jvm_path[MAXPATHLEN] = {0};
1706
1707 // Find the full path to the current module, libjvm.so.
1708 void os::jvm_path(char *buf, jint buflen) {
1709 // Error checking.
1710 if (buflen < MAXPATHLEN) {
1711 assert(false, "must use a large-enough buffer");
1712 buf[0] = '\0';
1713 return;
1714 }
1715 // Lazy resolve the path to current module.
1716 if (saved_jvm_path[0] != 0) {
1717 strcpy(buf, saved_jvm_path);
1718 return;
1719 }
1720
1721 Dl_info dlinfo;
1722 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1723 assert(ret != 0, "cannot locate libjvm");
1724 char* rp = realpath((char *)dlinfo.dli_fname, buf);
1725 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1726
1727 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1728 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1729 }
1730
1731 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1732 // no prefix required, not even "_"
1733 }
1734
1735 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1736 // no suffix required
1737 }
1738
1739 ////////////////////////////////////////////////////////////////////////////////
1740 // sun.misc.Signal support
1741
1742 static volatile jint sigint_count = 0;
1743
1744 static void
1745 UserHandler(int sig, void *siginfo, void *context) {
1746 // 4511530 - sem_post is serialized and handled by the manager thread. When
1747 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1748 // don't want to flood the manager thread with sem_post requests.
1749 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1750 return;
1751
1752 // Ctrl-C is pressed during error reporting, likely because the error
1753 // handler fails to abort. Let VM die immediately.
1754 if (sig == SIGINT && is_error_reported()) {
1755 os::die();
1756 }
1757
1758 os::signal_notify(sig);
1759 }
1760
1761 void* os::user_handler() {
1762 return CAST_FROM_FN_PTR(void*, UserHandler);
1763 }
1764
1765 extern "C" {
1766 typedef void (*sa_handler_t)(int);
1767 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1768 }
1769
1770 void* os::signal(int signal_number, void* handler) {
1771 struct sigaction sigAct, oldSigAct;
1772
1773 sigfillset(&(sigAct.sa_mask));
1774
1775 // Do not block out synchronous signals in the signal handler.
1776 // Blocking synchronous signals only makes sense if you can really
1777 // be sure that those signals won't happen during signal handling,
1778 // when the blocking applies. Normal signal handlers are lean and
1779 // do not cause signals. But our signal handlers tend to be "risky"
1780 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1781 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1782 // by a SIGILL, which was blocked due to the signal mask. The process
1783 // just hung forever. Better to crash from a secondary signal than to hang.
1784 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1785 sigdelset(&(sigAct.sa_mask), SIGBUS);
1786 sigdelset(&(sigAct.sa_mask), SIGILL);
1787 sigdelset(&(sigAct.sa_mask), SIGFPE);
1788 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1789
1790 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1791
1792 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1793
1794 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1795 // -1 means registration failed
1796 return (void *)-1;
1797 }
1798
1799 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1800 }
1801
1802 void os::signal_raise(int signal_number) {
1803 ::raise(signal_number);
1804 }
1805
1806 //
1807 // The following code is moved from os.cpp for making this
1808 // code platform specific, which it is by its very nature.
1809 //
1810
1811 // Will be modified when max signal is changed to be dynamic
1812 int os::sigexitnum_pd() {
1813 return NSIG;
1814 }
1815
1816 // a counter for each possible signal value
1817 static volatile jint pending_signals[NSIG+1] = { 0 };
1818
1819 // Linux(POSIX) specific hand shaking semaphore.
1820 static sem_t sig_sem;
1821
1822 void os::signal_init_pd() {
1823 // Initialize signal structures
1824 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1825
1826 // Initialize signal semaphore
1827 int rc = ::sem_init(&sig_sem, 0, 0);
1828 guarantee(rc != -1, "sem_init failed");
1829 }
1830
1831 void os::signal_notify(int sig) {
1832 Atomic::inc(&pending_signals[sig]);
1833 ::sem_post(&sig_sem);
1834 }
1835
1836 static int check_pending_signals(bool wait) {
1837 Atomic::store(0, &sigint_count);
1838 for (;;) {
1839 for (int i = 0; i < NSIG + 1; i++) {
1840 jint n = pending_signals[i];
1841 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1842 return i;
1843 }
1844 }
1845 if (!wait) {
1846 return -1;
1847 }
1848 JavaThread *thread = JavaThread::current();
1849 ThreadBlockInVM tbivm(thread);
1850
1851 bool threadIsSuspended;
1852 do {
1853 thread->set_suspend_equivalent();
1854 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1855
1856 ::sem_wait(&sig_sem);
1857
1858 // were we externally suspended while we were waiting?
1859 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1860 if (threadIsSuspended) {
1861 //
1862 // The semaphore has been incremented, but while we were waiting
1863 // another thread suspended us. We don't want to continue running
1864 // while suspended because that would surprise the thread that
1865 // suspended us.
1866 //
1867 ::sem_post(&sig_sem);
1868
1869 thread->java_suspend_self();
1870 }
1871 } while (threadIsSuspended);
1872 }
1873 }
1874
1875 int os::signal_lookup() {
1876 return check_pending_signals(false);
1877 }
1878
1879 int os::signal_wait() {
1880 return check_pending_signals(true);
1881 }
1882
1883 ////////////////////////////////////////////////////////////////////////////////
1884 // Virtual Memory
1885
1886 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1887
1888 #define VMEM_MAPPED 1
1889 #define VMEM_SHMATED 2
1890
1891 struct vmembk_t {
1892 int type; // 1 - mmap, 2 - shmat
1893 char* addr;
1894 size_t size; // Real size, may be larger than usersize.
1895 size_t pagesize; // page size of area
1896 vmembk_t* next;
1897
1898 bool contains_addr(char* p) const {
1899 return p >= addr && p < (addr + size);
1900 }
1901
1902 bool contains_range(char* p, size_t s) const {
1903 return contains_addr(p) && contains_addr(p + s - 1);
1904 }
1905
1906 void print_on(outputStream* os) const {
1907 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1908 " bytes, %d %s pages), %s",
1909 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1910 (type == VMEM_SHMATED ? "shmat" : "mmap")
1911 );
1912 }
1913
1914 // Check that range is a sub range of memory block (or equal to memory block);
1915 // also check that range is fully page aligned to the page size if the block.
1916 void assert_is_valid_subrange(char* p, size_t s) const {
1917 if (!contains_range(p, s)) {
1918 fprintf(stderr, "[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1919 "range of [" PTR_FORMAT " - " PTR_FORMAT "].\n",
1920 p, p + s - 1, addr, addr + size - 1);
1921 guarantee0(false);
1922 }
1923 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1924 fprintf(stderr, "range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1925 " aligned to pagesize (%s)\n", p, p + s);
1926 guarantee0(false);
1927 }
1928 }
1929 };
1930
1931 static struct {
1932 vmembk_t* first;
1933 MiscUtils::CritSect cs;
1934 } vmem;
1935
1936 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1937 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1938 assert0(p);
1939 if (p) {
1940 MiscUtils::AutoCritSect lck(&vmem.cs);
1941 p->addr = addr; p->size = size;
1942 p->pagesize = pagesize;
1943 p->type = type;
1944 p->next = vmem.first;
1945 vmem.first = p;
1946 }
1947 }
1948
1949 static vmembk_t* vmembk_find(char* addr) {
1950 MiscUtils::AutoCritSect lck(&vmem.cs);
1951 for (vmembk_t* p = vmem.first; p; p = p->next) {
1952 if (p->addr <= addr && (p->addr + p->size) > addr) {
1953 return p;
1954 }
1955 }
1956 return NULL;
1957 }
1958
1959 static void vmembk_remove(vmembk_t* p0) {
1960 MiscUtils::AutoCritSect lck(&vmem.cs);
1961 assert0(p0);
1962 assert0(vmem.first); // List should not be empty.
1963 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1964 if (*pp == p0) {
1965 *pp = p0->next;
1966 ::free(p0);
1967 return;
1968 }
1969 }
1970 assert0(false); // Not found?
1971 }
1972
1973 static void vmembk_print_on(outputStream* os) {
1974 MiscUtils::AutoCritSect lck(&vmem.cs);
1975 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1976 vmi->print_on(os);
1977 os->cr();
1978 }
1979 }
1980
1981 // Reserve and attach a section of System V memory.
1982 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1983 // address. Failing that, it will attach the memory anywhere.
1984 // If <requested_addr> is NULL, function will attach the memory anywhere.
1985 //
1986 // <alignment_hint> is being ignored by this function. It is very probable however that the
1987 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1988 // Should this be not enogh, we can put more work into it.
1989 static char* reserve_shmated_memory (
1990 size_t bytes,
1991 char* requested_addr,
1992 size_t alignment_hint) {
1993
1994 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1995 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1996 bytes, requested_addr, alignment_hint);
1997
1998 // Either give me wish address or wish alignment but not both.
1999 assert0(!(requested_addr != NULL && alignment_hint != 0));
2000
2001 // We must prevent anyone from attaching too close to the
2002 // BRK because that may cause malloc OOM.
2003 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2004 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2005 "Will attach anywhere.", requested_addr);
2006 // Act like the OS refused to attach there.
2007 requested_addr = NULL;
2008 }
2009
2010 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
2011 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
2012 if (os::Aix::on_pase_V5R4_or_older()) {
2013 ShouldNotReachHere();
2014 }
2015
2016 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
2017 const size_t size = align_size_up(bytes, SIZE_64K);
2018
2019 // Reserve the shared segment.
2020 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2021 if (shmid == -1) {
2022 trc("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
2023 return NULL;
2024 }
2025
2026 // Important note:
2027 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2028 // We must right after attaching it remove it from the system. System V shm segments are global and
2029 // survive the process.
2030 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
2031
2032 struct shmid_ds shmbuf;
2033 memset(&shmbuf, 0, sizeof(shmbuf));
2034 shmbuf.shm_pagesize = SIZE_64K;
2035 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
2036 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
2037 size / SIZE_64K, errno);
2038 // I want to know if this ever happens.
2039 assert(false, "failed to set page size for shmat");
2040 }
2041
2042 // Now attach the shared segment.
2043 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2044 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2045 // were not a segment boundary.
2046 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2047 const int errno_shmat = errno;
2048
2049 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2050 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2051 trc("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2052 assert(false, "failed to remove shared memory segment!");
2053 }
2054
2055 // Handle shmat error. If we failed to attach, just return.
2056 if (addr == (char*)-1) {
2057 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2058 return NULL;
2059 }
2060
2061 // Just for info: query the real page size. In case setting the page size did not
2062 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2063 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2064 if (real_pagesize != shmbuf.shm_pagesize) {
2065 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2066 }
2067
2068 if (addr) {
2069 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2070 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2071 } else {
2072 if (requested_addr != NULL) {
2073 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2074 } else {
2075 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2076 }
2077 }
2078
2079 // book-keeping
2080 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2081 assert0(is_aligned_to(addr, os::vm_page_size()));
2082
2083 return addr;
2084 }
2085
2086 static bool release_shmated_memory(char* addr, size_t size) {
2087
2088 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2089 addr, addr + size - 1);
2090
2091 bool rc = false;
2092
2093 // TODO: is there a way to verify shm size without doing bookkeeping?
2094 if (::shmdt(addr) != 0) {
2095 trcVerbose("error (%d).", errno);
2096 } else {
2097 trcVerbose("ok.");
2098 rc = true;
2099 }
2100 return rc;
2101 }
2102
2103 static bool uncommit_shmated_memory(char* addr, size_t size) {
2104 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2105 addr, addr + size - 1);
2106
2107 const bool rc = my_disclaim64(addr, size);
2108
2109 if (!rc) {
2110 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2111 return false;
2112 }
2113 return true;
2114 }
2115
2116 // Reserve memory via mmap.
2117 // If <requested_addr> is given, an attempt is made to attach at the given address.
2118 // Failing that, memory is allocated at any address.
2119 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2120 // allocate at an address aligned with the given alignment. Failing that, memory
2121 // is aligned anywhere.
2122 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2123 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2124 "alignment_hint " UINTX_FORMAT "...",
2125 bytes, requested_addr, alignment_hint);
2126
2127 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2128 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2129 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2130 return NULL;
2131 }
2132
2133 // We must prevent anyone from attaching too close to the
2134 // BRK because that may cause malloc OOM.
2135 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2136 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2137 "Will attach anywhere.", requested_addr);
2138 // Act like the OS refused to attach there.
2139 requested_addr = NULL;
2140 }
2141
2142 // Specify one or the other but not both.
2143 assert0(!(requested_addr != NULL && alignment_hint > 0));
2144
2145 // In 64K mode, we claim the global page size (os::vm_page_size())
2146 // is 64K. This is one of the few points where that illusion may
2147 // break, because mmap() will always return memory aligned to 4K. So
2148 // we must ensure we only ever return memory aligned to 64k.
2149 if (alignment_hint) {
2150 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2151 } else {
2152 alignment_hint = os::vm_page_size();
2153 }
2154
2155 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2156 const size_t size = align_size_up(bytes, os::vm_page_size());
2157
2158 // alignment: Allocate memory large enough to include an aligned range of the right size and
2159 // cut off the leading and trailing waste pages.
2160 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2161 const size_t extra_size = size + alignment_hint;
2162
2163 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2164 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2165 int flags = MAP_ANONYMOUS | MAP_SHARED;
2166
2167 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2168 // it means if wishaddress is given but MAP_FIXED is not set.
2169 //
2170 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2171 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2172 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2173 // get clobbered.
2174 if (requested_addr != NULL) {
2175 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2176 flags |= MAP_FIXED;
2177 }
2178 }
2179
2180 char* addr = (char*)::mmap(requested_addr, extra_size,
2181 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2182
2183 if (addr == MAP_FAILED) {
2184 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2185 return NULL;
2186 }
2187
2188 // Handle alignment.
2189 char* const addr_aligned = (char *)align_ptr_up(addr, alignment_hint);
2190 const size_t waste_pre = addr_aligned - addr;
2191 char* const addr_aligned_end = addr_aligned + size;
2192 const size_t waste_post = extra_size - waste_pre - size;
2193 if (waste_pre > 0) {
2194 ::munmap(addr, waste_pre);
2195 }
2196 if (waste_post > 0) {
2197 ::munmap(addr_aligned_end, waste_post);
2198 }
2199 addr = addr_aligned;
2200
2201 if (addr) {
2202 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2203 addr, addr + bytes, bytes);
2204 } else {
2205 if (requested_addr != NULL) {
2206 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2207 } else {
2208 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2209 }
2210 }
2211
2212 // bookkeeping
2213 vmembk_add(addr, size, SIZE_4K, VMEM_MAPPED);
2214
2215 // Test alignment, see above.
2216 assert0(is_aligned_to(addr, os::vm_page_size()));
2217
2218 return addr;
2219 }
2220
2221 static bool release_mmaped_memory(char* addr, size_t size) {
2222 assert0(is_aligned_to(addr, os::vm_page_size()));
2223 assert0(is_aligned_to(size, os::vm_page_size()));
2224
2225 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2226 addr, addr + size - 1);
2227 bool rc = false;
2228
2229 if (::munmap(addr, size) != 0) {
2230 trcVerbose("failed (%d)\n", errno);
2231 rc = false;
2232 } else {
2233 trcVerbose("ok.");
2234 rc = true;
2235 }
2236
2237 return rc;
2238 }
2239
2240 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2241
2242 assert0(is_aligned_to(addr, os::vm_page_size()));
2243 assert0(is_aligned_to(size, os::vm_page_size()));
2244
2245 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2246 addr, addr + size - 1);
2247 bool rc = false;
2248
2249 // Uncommit mmap memory with msync MS_INVALIDATE.
2250 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2251 trcVerbose("failed (%d)\n", errno);
2252 rc = false;
2253 } else {
2254 trcVerbose("ok.");
2255 rc = true;
2256 }
2257
2258 return rc;
2259 }
2260
2261 // End: shared memory bookkeeping
2262 ////////////////////////////////////////////////////////////////////////////////////////////////////
2263
2264 int os::vm_page_size() {
2265 // Seems redundant as all get out.
2266 assert(os::Aix::page_size() != -1, "must call os::init");
2267 return os::Aix::page_size();
2268 }
2269
2270 // Aix allocates memory by pages.
2271 int os::vm_allocation_granularity() {
2272 assert(os::Aix::page_size() != -1, "must call os::init");
2273 return os::Aix::page_size();
2274 }
2275
2276 #ifdef PRODUCT
2277 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2278 int err) {
2279 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2280 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2281 strerror(err), err);
2282 }
2283 #endif
2284
2285 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2286 const char* mesg) {
2287 assert(mesg != NULL, "mesg must be specified");
2288 if (!pd_commit_memory(addr, size, exec)) {
2289 // Add extra info in product mode for vm_exit_out_of_memory():
2290 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2291 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg);
2292 }
2293 }
2294
2295 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2296
2297 assert0(is_aligned_to(addr, os::vm_page_size()));
2298 assert0(is_aligned_to(size, os::vm_page_size()));
2299
2300 vmembk_t* const vmi = vmembk_find(addr);
2301 assert0(vmi);
2302 vmi->assert_is_valid_subrange(addr, size);
2303
2304 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2305
2306 return true;
2307 }
2308
2309 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2310 return pd_commit_memory(addr, size, exec);
2311 }
2312
2313 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2314 size_t alignment_hint, bool exec,
2315 const char* mesg) {
2316 // Alignment_hint is ignored on this OS.
2317 pd_commit_memory_or_exit(addr, size, exec, mesg);
2318 }
2319
2320 bool os::pd_uncommit_memory(char* addr, size_t size) {
2321 assert0(is_aligned_to(addr, os::vm_page_size()));
2322 assert0(is_aligned_to(size, os::vm_page_size()));
2323
2324 // Dynamically do different things for mmap/shmat.
2325 const vmembk_t* const vmi = vmembk_find(addr);
2326 assert0(vmi);
2327 vmi->assert_is_valid_subrange(addr, size);
2328
2329 if (vmi->type == VMEM_SHMATED) {
2330 return uncommit_shmated_memory(addr, size);
2331 } else {
2332 return uncommit_mmaped_memory(addr, size);
2333 }
2334 }
2335
2336 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2337 // Do not call this; no need to commit stack pages on AIX.
2338 ShouldNotReachHere();
2339 return true;
2340 }
2341
2342 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2343 // Do not call this; no need to commit stack pages on AIX.
2344 ShouldNotReachHere();
2345 return true;
2346 }
2347
2348 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2349 }
2350
2351 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2352 }
2353
2354 void os::numa_make_global(char *addr, size_t bytes) {
2355 }
2356
2357 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2358 }
2359
2360 bool os::numa_topology_changed() {
2361 return false;
2362 }
2363
2364 size_t os::numa_get_groups_num() {
2365 return 1;
2366 }
2367
2368 int os::numa_get_group_id() {
2369 return 0;
2370 }
2371
2372 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2373 if (size > 0) {
2374 ids[0] = 0;
2375 return 1;
2376 }
2377 return 0;
2378 }
2379
2380 bool os::get_page_info(char *start, page_info* info) {
2381 return false;
2382 }
2383
2384 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2385 return end;
2386 }
2387
2388 // Reserves and attaches a shared memory segment.
2389 // Will assert if a wish address is given and could not be obtained.
2390 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2391
2392 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2393 // thereby clobbering old mappings at that place. That is probably
2394 // not intended, never used and almost certainly an error were it
2395 // ever be used this way (to try attaching at a specified address
2396 // without clobbering old mappings an alternate API exists,
2397 // os::attempt_reserve_memory_at()).
2398 // Instead of mimicking the dangerous coding of the other platforms, here I
2399 // just ignore the request address (release) or assert(debug).
2400 assert0(requested_addr == NULL);
2401
2402 // Always round to os::vm_page_size(), which may be larger than 4K.
2403 bytes = align_size_up(bytes, os::vm_page_size());
2404 const size_t alignment_hint0 =
2405 alignment_hint ? align_size_up(alignment_hint, os::vm_page_size()) : 0;
2406
2407 // In 4K mode always use mmap.
2408 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2409 if (os::vm_page_size() == SIZE_4K) {
2410 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2411 } else {
2412 if (bytes >= Use64KPagesThreshold) {
2413 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2414 } else {
2415 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2416 }
2417 }
2418 }
2419
2420 bool os::pd_release_memory(char* addr, size_t size) {
2421
2422 // Dynamically do different things for mmap/shmat.
2423 vmembk_t* const vmi = vmembk_find(addr);
2424 assert0(vmi);
2425
2426 // Always round to os::vm_page_size(), which may be larger than 4K.
2427 size = align_size_up(size, os::vm_page_size());
2428 addr = (char *)align_ptr_up(addr, os::vm_page_size());
2429
2430 bool rc = false;
2431 bool remove_bookkeeping = false;
2432 if (vmi->type == VMEM_SHMATED) {
2433 // For shmatted memory, we do:
2434 // - If user wants to release the whole range, release the memory (shmdt).
2435 // - If user only wants to release a partial range, uncommit (disclaim) that
2436 // range. That way, at least, we do not use memory anymore (bust still page
2437 // table space).
2438 vmi->assert_is_valid_subrange(addr, size);
2439 if (addr == vmi->addr && size == vmi->size) {
2440 rc = release_shmated_memory(addr, size);
2441 remove_bookkeeping = true;
2442 } else {
2443 rc = uncommit_shmated_memory(addr, size);
2444 }
2445 } else {
2446 // User may unmap partial regions but region has to be fully contained.
2447 #ifdef ASSERT
2448 vmi->assert_is_valid_subrange(addr, size);
2449 #endif
2450 rc = release_mmaped_memory(addr, size);
2451 remove_bookkeeping = true;
2452 }
2453
2454 // update bookkeeping
2455 if (rc && remove_bookkeeping) {
2456 vmembk_remove(vmi);
2457 }
2458
2459 return rc;
2460 }
2461
2462 static bool checked_mprotect(char* addr, size_t size, int prot) {
2463
2464 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2465 // not tell me if protection failed when trying to protect an un-protectable range.
2466 //
2467 // This means if the memory was allocated using shmget/shmat, protection wont work
2468 // but mprotect will still return 0:
2469 //
2470 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2471
2472 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2473
2474 if (!rc) {
2475 const char* const s_errno = strerror(errno);
2476 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2477 return false;
2478 }
2479
2480 // mprotect success check
2481 //
2482 // Mprotect said it changed the protection but can I believe it?
2483 //
2484 // To be sure I need to check the protection afterwards. Try to
2485 // read from protected memory and check whether that causes a segfault.
2486 //
2487 if (!os::Aix::xpg_sus_mode()) {
2488
2489 if (CanUseSafeFetch32()) {
2490
2491 const bool read_protected =
2492 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2493 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2494
2495 if (prot & PROT_READ) {
2496 rc = !read_protected;
2497 } else {
2498 rc = read_protected;
2499 }
2500 }
2501 }
2502 if (!rc) {
2503 assert(false, "mprotect failed.");
2504 }
2505 return rc;
2506 }
2507
2508 // Set protections specified
2509 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2510 unsigned int p = 0;
2511 switch (prot) {
2512 case MEM_PROT_NONE: p = PROT_NONE; break;
2513 case MEM_PROT_READ: p = PROT_READ; break;
2514 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2515 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2516 default:
2517 ShouldNotReachHere();
2518 }
2519 // is_committed is unused.
2520 return checked_mprotect(addr, size, p);
2521 }
2522
2523 bool os::guard_memory(char* addr, size_t size) {
2524 return checked_mprotect(addr, size, PROT_NONE);
2525 }
2526
2527 bool os::unguard_memory(char* addr, size_t size) {
2528 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2529 }
2530
2531 // Large page support
2532
2533 static size_t _large_page_size = 0;
2534
2535 // Enable large page support if OS allows that.
2536 void os::large_page_init() {
2537 return; // Nothing to do. See query_multipage_support and friends.
2538 }
2539
2540 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2541 // "exec" is passed in but not used. Creating the shared image for
2542 // the code cache doesn't have an SHM_X executable permission to check.
2543 Unimplemented();
2544 return 0;
2545 }
2546
2547 bool os::release_memory_special(char* base, size_t bytes) {
2548 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2549 Unimplemented();
2550 return false;
2551 }
2552
2553 size_t os::large_page_size() {
2554 return _large_page_size;
2555 }
2556
2557 bool os::can_commit_large_page_memory() {
2558 // Does not matter, we do not support huge pages.
2559 return false;
2560 }
2561
2562 bool os::can_execute_large_page_memory() {
2563 // Does not matter, we do not support huge pages.
2564 return false;
2565 }
2566
2567 // Reserve memory at an arbitrary address, only if that area is
2568 // available (and not reserved for something else).
2569 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2570 char* addr = NULL;
2571
2572 // Always round to os::vm_page_size(), which may be larger than 4K.
2573 bytes = align_size_up(bytes, os::vm_page_size());
2574
2575 // In 4K mode always use mmap.
2576 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2577 if (os::vm_page_size() == SIZE_4K) {
2578 return reserve_mmaped_memory(bytes, requested_addr, 0);
2579 } else {
2580 if (bytes >= Use64KPagesThreshold) {
2581 return reserve_shmated_memory(bytes, requested_addr, 0);
2582 } else {
2583 return reserve_mmaped_memory(bytes, requested_addr, 0);
2584 }
2585 }
2586
2587 return addr;
2588 }
2589
2590 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2591 return ::read(fd, buf, nBytes);
2592 }
2593
2594 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2595 return ::pread(fd, buf, nBytes, offset);
2596 }
2597
2598 void os::naked_short_sleep(jlong ms) {
2599 struct timespec req;
2600
2601 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2602 req.tv_sec = 0;
2603 if (ms > 0) {
2604 req.tv_nsec = (ms % 1000) * 1000000;
2605 }
2606 else {
2607 req.tv_nsec = 1;
2608 }
2609
2610 nanosleep(&req, NULL);
2611
2612 return;
2613 }
2614
2615 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2616 void os::infinite_sleep() {
2617 while (true) { // sleep forever ...
2618 ::sleep(100); // ... 100 seconds at a time
2619 }
2620 }
2621
2622 // Used to convert frequent JVM_Yield() to nops
2623 bool os::dont_yield() {
2624 return DontYieldALot;
2625 }
2626
2627 void os::naked_yield() {
2628 sched_yield();
2629 }
2630
2631 ////////////////////////////////////////////////////////////////////////////////
2632 // thread priority support
2633
2634 // From AIX manpage to pthread_setschedparam
2635 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2636 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2637 //
2638 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2639 // range from 40 to 80, where 40 is the least favored priority and 80
2640 // is the most favored."
2641 //
2642 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2643 // scheduling there; however, this still leaves iSeries.)
2644 //
2645 // We use the same values for AIX and PASE.
2646 int os::java_to_os_priority[CriticalPriority + 1] = {
2647 54, // 0 Entry should never be used
2648
2649 55, // 1 MinPriority
2650 55, // 2
2651 56, // 3
2652
2653 56, // 4
2654 57, // 5 NormPriority
2655 57, // 6
2656
2657 58, // 7
2658 58, // 8
2659 59, // 9 NearMaxPriority
2660
2661 60, // 10 MaxPriority
2662
2663 60 // 11 CriticalPriority
2664 };
2665
2666 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2667 if (!UseThreadPriorities) return OS_OK;
2668 pthread_t thr = thread->osthread()->pthread_id();
2669 int policy = SCHED_OTHER;
2670 struct sched_param param;
2671 param.sched_priority = newpri;
2672 int ret = pthread_setschedparam(thr, policy, ¶m);
2673
2674 if (ret != 0) {
2675 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2676 (int)thr, newpri, ret, strerror(ret));
2677 }
2678 return (ret == 0) ? OS_OK : OS_ERR;
2679 }
2680
2681 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2682 if (!UseThreadPriorities) {
2683 *priority_ptr = java_to_os_priority[NormPriority];
2684 return OS_OK;
2685 }
2686 pthread_t thr = thread->osthread()->pthread_id();
2687 int policy = SCHED_OTHER;
2688 struct sched_param param;
2689 int ret = pthread_getschedparam(thr, &policy, ¶m);
2690 *priority_ptr = param.sched_priority;
2691
2692 return (ret == 0) ? OS_OK : OS_ERR;
2693 }
2694
2695 // Hint to the underlying OS that a task switch would not be good.
2696 // Void return because it's a hint and can fail.
2697 void os::hint_no_preempt() {}
2698
2699 ////////////////////////////////////////////////////////////////////////////////
2700 // suspend/resume support
2701
2702 // the low-level signal-based suspend/resume support is a remnant from the
2703 // old VM-suspension that used to be for java-suspension, safepoints etc,
2704 // within hotspot. Now there is a single use-case for this:
2705 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2706 // that runs in the watcher thread.
2707 // The remaining code is greatly simplified from the more general suspension
2708 // code that used to be used.
2709 //
2710 // The protocol is quite simple:
2711 // - suspend:
2712 // - sends a signal to the target thread
2713 // - polls the suspend state of the osthread using a yield loop
2714 // - target thread signal handler (SR_handler) sets suspend state
2715 // and blocks in sigsuspend until continued
2716 // - resume:
2717 // - sets target osthread state to continue
2718 // - sends signal to end the sigsuspend loop in the SR_handler
2719 //
2720 // Note that the SR_lock plays no role in this suspend/resume protocol.
2721 //
2722
2723 static void resume_clear_context(OSThread *osthread) {
2724 osthread->set_ucontext(NULL);
2725 osthread->set_siginfo(NULL);
2726 }
2727
2728 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2729 osthread->set_ucontext(context);
2730 osthread->set_siginfo(siginfo);
2731 }
2732
2733 //
2734 // Handler function invoked when a thread's execution is suspended or
2735 // resumed. We have to be careful that only async-safe functions are
2736 // called here (Note: most pthread functions are not async safe and
2737 // should be avoided.)
2738 //
2739 // Note: sigwait() is a more natural fit than sigsuspend() from an
2740 // interface point of view, but sigwait() prevents the signal hander
2741 // from being run. libpthread would get very confused by not having
2742 // its signal handlers run and prevents sigwait()'s use with the
2743 // mutex granting granting signal.
2744 //
2745 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2746 //
2747 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2748 // Save and restore errno to avoid confusing native code with EINTR
2749 // after sigsuspend.
2750 int old_errno = errno;
2751
2752 Thread* thread = Thread::current();
2753 OSThread* osthread = thread->osthread();
2754 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2755
2756 os::SuspendResume::State current = osthread->sr.state();
2757 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2758 suspend_save_context(osthread, siginfo, context);
2759
2760 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2761 os::SuspendResume::State state = osthread->sr.suspended();
2762 if (state == os::SuspendResume::SR_SUSPENDED) {
2763 sigset_t suspend_set; // signals for sigsuspend()
2764
2765 // get current set of blocked signals and unblock resume signal
2766 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2767 sigdelset(&suspend_set, SR_signum);
2768
2769 // wait here until we are resumed
2770 while (1) {
2771 sigsuspend(&suspend_set);
2772
2773 os::SuspendResume::State result = osthread->sr.running();
2774 if (result == os::SuspendResume::SR_RUNNING) {
2775 break;
2776 }
2777 }
2778
2779 } else if (state == os::SuspendResume::SR_RUNNING) {
2780 // request was cancelled, continue
2781 } else {
2782 ShouldNotReachHere();
2783 }
2784
2785 resume_clear_context(osthread);
2786 } else if (current == os::SuspendResume::SR_RUNNING) {
2787 // request was cancelled, continue
2788 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2789 // ignore
2790 } else {
2791 ShouldNotReachHere();
2792 }
2793
2794 errno = old_errno;
2795 }
2796
2797 static int SR_initialize() {
2798 struct sigaction act;
2799 char *s;
2800 // Get signal number to use for suspend/resume
2801 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2802 int sig = ::strtol(s, 0, 10);
2803 if (sig > 0 || sig < NSIG) {
2804 SR_signum = sig;
2805 }
2806 }
2807
2808 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2809 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2810
2811 sigemptyset(&SR_sigset);
2812 sigaddset(&SR_sigset, SR_signum);
2813
2814 // Set up signal handler for suspend/resume.
2815 act.sa_flags = SA_RESTART|SA_SIGINFO;
2816 act.sa_handler = (void (*)(int)) SR_handler;
2817
2818 // SR_signum is blocked by default.
2819 // 4528190 - We also need to block pthread restart signal (32 on all
2820 // supported Linux platforms). Note that LinuxThreads need to block
2821 // this signal for all threads to work properly. So we don't have
2822 // to use hard-coded signal number when setting up the mask.
2823 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2824
2825 if (sigaction(SR_signum, &act, 0) == -1) {
2826 return -1;
2827 }
2828
2829 // Save signal flag
2830 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2831 return 0;
2832 }
2833
2834 static int SR_finalize() {
2835 return 0;
2836 }
2837
2838 static int sr_notify(OSThread* osthread) {
2839 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2840 assert_status(status == 0, status, "pthread_kill");
2841 return status;
2842 }
2843
2844 // "Randomly" selected value for how long we want to spin
2845 // before bailing out on suspending a thread, also how often
2846 // we send a signal to a thread we want to resume
2847 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2848 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2849
2850 // returns true on success and false on error - really an error is fatal
2851 // but this seems the normal response to library errors
2852 static bool do_suspend(OSThread* osthread) {
2853 assert(osthread->sr.is_running(), "thread should be running");
2854 // mark as suspended and send signal
2855
2856 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2857 // failed to switch, state wasn't running?
2858 ShouldNotReachHere();
2859 return false;
2860 }
2861
2862 if (sr_notify(osthread) != 0) {
2863 // try to cancel, switch to running
2864
2865 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2866 if (result == os::SuspendResume::SR_RUNNING) {
2867 // cancelled
2868 return false;
2869 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2870 // somehow managed to suspend
2871 return true;
2872 } else {
2873 ShouldNotReachHere();
2874 return false;
2875 }
2876 }
2877
2878 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2879
2880 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2881 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2882 os::naked_yield();
2883 }
2884
2885 // timeout, try to cancel the request
2886 if (n >= RANDOMLY_LARGE_INTEGER) {
2887 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2888 if (cancelled == os::SuspendResume::SR_RUNNING) {
2889 return false;
2890 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2891 return true;
2892 } else {
2893 ShouldNotReachHere();
2894 return false;
2895 }
2896 }
2897 }
2898
2899 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2900 return true;
2901 }
2902
2903 static void do_resume(OSThread* osthread) {
2904 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2905
2906 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2907 // failed to switch to WAKEUP_REQUEST
2908 ShouldNotReachHere();
2909 return;
2910 }
2911
2912 while (!osthread->sr.is_running()) {
2913 if (sr_notify(osthread) == 0) {
2914 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2915 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2916 os::naked_yield();
2917 }
2918 }
2919 } else {
2920 ShouldNotReachHere();
2921 }
2922 }
2923
2924 guarantee(osthread->sr.is_running(), "Must be running!");
2925 }
2926
2927 ///////////////////////////////////////////////////////////////////////////////////
2928 // signal handling (except suspend/resume)
2929
2930 // This routine may be used by user applications as a "hook" to catch signals.
2931 // The user-defined signal handler must pass unrecognized signals to this
2932 // routine, and if it returns true (non-zero), then the signal handler must
2933 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2934 // routine will never retun false (zero), but instead will execute a VM panic
2935 // routine kill the process.
2936 //
2937 // If this routine returns false, it is OK to call it again. This allows
2938 // the user-defined signal handler to perform checks either before or after
2939 // the VM performs its own checks. Naturally, the user code would be making
2940 // a serious error if it tried to handle an exception (such as a null check
2941 // or breakpoint) that the VM was generating for its own correct operation.
2942 //
2943 // This routine may recognize any of the following kinds of signals:
2944 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2945 // It should be consulted by handlers for any of those signals.
2946 //
2947 // The caller of this routine must pass in the three arguments supplied
2948 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2949 // field of the structure passed to sigaction(). This routine assumes that
2950 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2951 //
2952 // Note that the VM will print warnings if it detects conflicting signal
2953 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2954 //
2955 extern "C" JNIEXPORT int
2956 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2957
2958 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2959 // to be the thing to call; documentation is not terribly clear about whether
2960 // pthread_sigmask also works, and if it does, whether it does the same.
2961 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2962 const int rc = ::pthread_sigmask(how, set, oset);
2963 // return value semantics differ slightly for error case:
2964 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2965 // (so, pthread_sigmask is more theadsafe for error handling)
2966 // But success is always 0.
2967 return rc == 0 ? true : false;
2968 }
2969
2970 // Function to unblock all signals which are, according
2971 // to POSIX, typical program error signals. If they happen while being blocked,
2972 // they typically will bring down the process immediately.
2973 bool unblock_program_error_signals() {
2974 sigset_t set;
2975 ::sigemptyset(&set);
2976 ::sigaddset(&set, SIGILL);
2977 ::sigaddset(&set, SIGBUS);
2978 ::sigaddset(&set, SIGFPE);
2979 ::sigaddset(&set, SIGSEGV);
2980 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2981 }
2982
2983 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2984 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2985 assert(info != NULL && uc != NULL, "it must be old kernel");
2986
2987 // Never leave program error signals blocked;
2988 // on all our platforms they would bring down the process immediately when
2989 // getting raised while being blocked.
2990 unblock_program_error_signals();
2991
2992 JVM_handle_aix_signal(sig, info, uc, true);
2993 }
2994
2995 // This boolean allows users to forward their own non-matching signals
2996 // to JVM_handle_aix_signal, harmlessly.
2997 bool os::Aix::signal_handlers_are_installed = false;
2998
2999 // For signal-chaining
3000 struct sigaction os::Aix::sigact[MAXSIGNUM];
3001 unsigned int os::Aix::sigs = 0;
3002 bool os::Aix::libjsig_is_loaded = false;
3003 typedef struct sigaction *(*get_signal_t)(int);
3004 get_signal_t os::Aix::get_signal_action = NULL;
3005
3006 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3007 struct sigaction *actp = NULL;
3008
3009 if (libjsig_is_loaded) {
3010 // Retrieve the old signal handler from libjsig
3011 actp = (*get_signal_action)(sig);
3012 }
3013 if (actp == NULL) {
3014 // Retrieve the preinstalled signal handler from jvm
3015 actp = get_preinstalled_handler(sig);
3016 }
3017
3018 return actp;
3019 }
3020
3021 static bool call_chained_handler(struct sigaction *actp, int sig,
3022 siginfo_t *siginfo, void *context) {
3023 // Call the old signal handler
3024 if (actp->sa_handler == SIG_DFL) {
3025 // It's more reasonable to let jvm treat it as an unexpected exception
3026 // instead of taking the default action.
3027 return false;
3028 } else if (actp->sa_handler != SIG_IGN) {
3029 if ((actp->sa_flags & SA_NODEFER) == 0) {
3030 // automaticlly block the signal
3031 sigaddset(&(actp->sa_mask), sig);
3032 }
3033
3034 sa_handler_t hand = NULL;
3035 sa_sigaction_t sa = NULL;
3036 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3037 // retrieve the chained handler
3038 if (siginfo_flag_set) {
3039 sa = actp->sa_sigaction;
3040 } else {
3041 hand = actp->sa_handler;
3042 }
3043
3044 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3045 actp->sa_handler = SIG_DFL;
3046 }
3047
3048 // try to honor the signal mask
3049 sigset_t oset;
3050 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3051
3052 // call into the chained handler
3053 if (siginfo_flag_set) {
3054 (*sa)(sig, siginfo, context);
3055 } else {
3056 (*hand)(sig);
3057 }
3058
3059 // restore the signal mask
3060 pthread_sigmask(SIG_SETMASK, &oset, 0);
3061 }
3062 // Tell jvm's signal handler the signal is taken care of.
3063 return true;
3064 }
3065
3066 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3067 bool chained = false;
3068 // signal-chaining
3069 if (UseSignalChaining) {
3070 struct sigaction *actp = get_chained_signal_action(sig);
3071 if (actp != NULL) {
3072 chained = call_chained_handler(actp, sig, siginfo, context);
3073 }
3074 }
3075 return chained;
3076 }
3077
3078 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3079 if ((((unsigned int)1 << sig) & sigs) != 0) {
3080 return &sigact[sig];
3081 }
3082 return NULL;
3083 }
3084
3085 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3086 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3087 sigact[sig] = oldAct;
3088 sigs |= (unsigned int)1 << sig;
3089 }
3090
3091 // for diagnostic
3092 int os::Aix::sigflags[MAXSIGNUM];
3093
3094 int os::Aix::get_our_sigflags(int sig) {
3095 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3096 return sigflags[sig];
3097 }
3098
3099 void os::Aix::set_our_sigflags(int sig, int flags) {
3100 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3101 sigflags[sig] = flags;
3102 }
3103
3104 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3105 // Check for overwrite.
3106 struct sigaction oldAct;
3107 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3108
3109 void* oldhand = oldAct.sa_sigaction
3110 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3111 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3112 // Renamed 'signalHandler' to avoid collision with other shared libs.
3113 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3114 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3115 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3116 if (AllowUserSignalHandlers || !set_installed) {
3117 // Do not overwrite; user takes responsibility to forward to us.
3118 return;
3119 } else if (UseSignalChaining) {
3120 // save the old handler in jvm
3121 save_preinstalled_handler(sig, oldAct);
3122 // libjsig also interposes the sigaction() call below and saves the
3123 // old sigaction on it own.
3124 } else {
3125 fatal(err_msg("Encountered unexpected pre-existing sigaction handler "
3126 "%#lx for signal %d.", (long)oldhand, sig));
3127 }
3128 }
3129
3130 struct sigaction sigAct;
3131 sigfillset(&(sigAct.sa_mask));
3132 if (!set_installed) {
3133 sigAct.sa_handler = SIG_DFL;
3134 sigAct.sa_flags = SA_RESTART;
3135 } else {
3136 // Renamed 'signalHandler' to avoid collision with other shared libs.
3137 sigAct.sa_sigaction = javaSignalHandler;
3138 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3139 }
3140 // Save flags, which are set by ours
3141 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
3142 sigflags[sig] = sigAct.sa_flags;
3143
3144 int ret = sigaction(sig, &sigAct, &oldAct);
3145 assert(ret == 0, "check");
3146
3147 void* oldhand2 = oldAct.sa_sigaction
3148 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3149 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3150 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3151 }
3152
3153 // install signal handlers for signals that HotSpot needs to
3154 // handle in order to support Java-level exception handling.
3155 void os::Aix::install_signal_handlers() {
3156 if (!signal_handlers_are_installed) {
3157 signal_handlers_are_installed = true;
3158
3159 // signal-chaining
3160 typedef void (*signal_setting_t)();
3161 signal_setting_t begin_signal_setting = NULL;
3162 signal_setting_t end_signal_setting = NULL;
3163 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3164 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3165 if (begin_signal_setting != NULL) {
3166 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3167 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3168 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3169 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3170 libjsig_is_loaded = true;
3171 assert(UseSignalChaining, "should enable signal-chaining");
3172 }
3173 if (libjsig_is_loaded) {
3174 // Tell libjsig jvm is setting signal handlers
3175 (*begin_signal_setting)();
3176 }
3177
3178 set_signal_handler(SIGSEGV, true);
3179 set_signal_handler(SIGPIPE, true);
3180 set_signal_handler(SIGBUS, true);
3181 set_signal_handler(SIGILL, true);
3182 set_signal_handler(SIGFPE, true);
3183 set_signal_handler(SIGTRAP, true);
3184 set_signal_handler(SIGXFSZ, true);
3185 set_signal_handler(SIGDANGER, true);
3186
3187 if (libjsig_is_loaded) {
3188 // Tell libjsig jvm finishes setting signal handlers.
3189 (*end_signal_setting)();
3190 }
3191
3192 // We don't activate signal checker if libjsig is in place, we trust ourselves
3193 // and if UserSignalHandler is installed all bets are off.
3194 // Log that signal checking is off only if -verbose:jni is specified.
3195 if (CheckJNICalls) {
3196 if (libjsig_is_loaded) {
3197 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3198 check_signals = false;
3199 }
3200 if (AllowUserSignalHandlers) {
3201 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3202 check_signals = false;
3203 }
3204 // Need to initialize check_signal_done.
3205 ::sigemptyset(&check_signal_done);
3206 }
3207 }
3208 }
3209
3210 static const char* get_signal_handler_name(address handler,
3211 char* buf, int buflen) {
3212 int offset;
3213 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3214 if (found) {
3215 // skip directory names
3216 const char *p1, *p2;
3217 p1 = buf;
3218 size_t len = strlen(os::file_separator());
3219 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3220 // The way os::dll_address_to_library_name is implemented on Aix
3221 // right now, it always returns -1 for the offset which is not
3222 // terribly informative.
3223 // Will fix that. For now, omit the offset.
3224 jio_snprintf(buf, buflen, "%s", p1);
3225 } else {
3226 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3227 }
3228 return buf;
3229 }
3230
3231 static void print_signal_handler(outputStream* st, int sig,
3232 char* buf, size_t buflen) {
3233 struct sigaction sa;
3234 sigaction(sig, NULL, &sa);
3235
3236 st->print("%s: ", os::exception_name(sig, buf, buflen));
3237
3238 address handler = (sa.sa_flags & SA_SIGINFO)
3239 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3240 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3241
3242 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3243 st->print("SIG_DFL");
3244 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3245 st->print("SIG_IGN");
3246 } else {
3247 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3248 }
3249
3250 // Print readable mask.
3251 st->print(", sa_mask[0]=");
3252 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3253
3254 address rh = VMError::get_resetted_sighandler(sig);
3255 // May be, handler was resetted by VMError?
3256 if (rh != NULL) {
3257 handler = rh;
3258 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3259 }
3260
3261 // Print textual representation of sa_flags.
3262 st->print(", sa_flags=");
3263 os::Posix::print_sa_flags(st, sa.sa_flags);
3264
3265 // Check: is it our handler?
3266 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3267 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3268 // It is our signal handler.
3269 // Check for flags, reset system-used one!
3270 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3271 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3272 os::Aix::get_our_sigflags(sig));
3273 }
3274 }
3275 st->cr();
3276 }
3277
3278 #define DO_SIGNAL_CHECK(sig) \
3279 if (!sigismember(&check_signal_done, sig)) \
3280 os::Aix::check_signal_handler(sig)
3281
3282 // This method is a periodic task to check for misbehaving JNI applications
3283 // under CheckJNI, we can add any periodic checks here
3284
3285 void os::run_periodic_checks() {
3286
3287 if (check_signals == false) return;
3288
3289 // SEGV and BUS if overridden could potentially prevent
3290 // generation of hs*.log in the event of a crash, debugging
3291 // such a case can be very challenging, so we absolutely
3292 // check the following for a good measure:
3293 DO_SIGNAL_CHECK(SIGSEGV);
3294 DO_SIGNAL_CHECK(SIGILL);
3295 DO_SIGNAL_CHECK(SIGFPE);
3296 DO_SIGNAL_CHECK(SIGBUS);
3297 DO_SIGNAL_CHECK(SIGPIPE);
3298 DO_SIGNAL_CHECK(SIGXFSZ);
3299 if (UseSIGTRAP) {
3300 DO_SIGNAL_CHECK(SIGTRAP);
3301 }
3302 DO_SIGNAL_CHECK(SIGDANGER);
3303
3304 // ReduceSignalUsage allows the user to override these handlers
3305 // see comments at the very top and jvm_solaris.h
3306 if (!ReduceSignalUsage) {
3307 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3308 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3309 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3310 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3311 }
3312
3313 DO_SIGNAL_CHECK(SR_signum);
3314 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL);
3315 }
3316
3317 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3318
3319 static os_sigaction_t os_sigaction = NULL;
3320
3321 void os::Aix::check_signal_handler(int sig) {
3322 char buf[O_BUFLEN];
3323 address jvmHandler = NULL;
3324
3325 struct sigaction act;
3326 if (os_sigaction == NULL) {
3327 // only trust the default sigaction, in case it has been interposed
3328 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction");
3329 if (os_sigaction == NULL) return;
3330 }
3331
3332 os_sigaction(sig, (struct sigaction*)NULL, &act);
3333
3334 address thisHandler = (act.sa_flags & SA_SIGINFO)
3335 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3336 : CAST_FROM_FN_PTR(address, act.sa_handler);
3337
3338 switch(sig) {
3339 case SIGSEGV:
3340 case SIGBUS:
3341 case SIGFPE:
3342 case SIGPIPE:
3343 case SIGILL:
3344 case SIGXFSZ:
3345 // Renamed 'signalHandler' to avoid collision with other shared libs.
3346 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3347 break;
3348
3349 case SHUTDOWN1_SIGNAL:
3350 case SHUTDOWN2_SIGNAL:
3351 case SHUTDOWN3_SIGNAL:
3352 case BREAK_SIGNAL:
3353 jvmHandler = (address)user_handler();
3354 break;
3355
3356 case INTERRUPT_SIGNAL:
3357 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL);
3358 break;
3359
3360 default:
3361 if (sig == SR_signum) {
3362 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3363 } else {
3364 return;
3365 }
3366 break;
3367 }
3368
3369 if (thisHandler != jvmHandler) {
3370 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3371 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3372 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3373 // No need to check this sig any longer
3374 sigaddset(&check_signal_done, sig);
3375 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3376 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3377 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3378 exception_name(sig, buf, O_BUFLEN));
3379 }
3380 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3381 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3382 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig));
3383 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags);
3384 // No need to check this sig any longer
3385 sigaddset(&check_signal_done, sig);
3386 }
3387
3388 // Dump all the signal
3389 if (sigismember(&check_signal_done, sig)) {
3390 print_signal_handlers(tty, buf, O_BUFLEN);
3391 }
3392 }
3393
3394 extern bool signal_name(int signo, char* buf, size_t len);
3395
3396 const char* os::exception_name(int exception_code, char* buf, size_t size) {
3397 if (0 < exception_code && exception_code <= SIGRTMAX) {
3398 // signal
3399 if (!signal_name(exception_code, buf, size)) {
3400 jio_snprintf(buf, size, "SIG%d", exception_code);
3401 }
3402 return buf;
3403 } else {
3404 return NULL;
3405 }
3406 }
3407
3408 // To install functions for atexit system call
3409 extern "C" {
3410 static void perfMemory_exit_helper() {
3411 perfMemory_exit();
3412 }
3413 }
3414
3415 // This is called _before_ the most of global arguments have been parsed.
3416 void os::init(void) {
3417 // This is basic, we want to know if that ever changes.
3418 // (Shared memory boundary is supposed to be a 256M aligned.)
3419 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3420
3421 // First off, we need to know whether we run on AIX or PASE, and
3422 // the OS level we run on.
3423 os::Aix::initialize_os_info();
3424
3425 // Scan environment (SPEC1170 behaviour, etc).
3426 os::Aix::scan_environment();
3427
3428 // Check which pages are supported by AIX.
3429 query_multipage_support();
3430
3431 // Act like we only have one page size by eliminating corner cases which
3432 // we did not support very well anyway.
3433 // We have two input conditions:
3434 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3435 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3436 // setting.
3437 // Data segment page size is important for us because it defines the thread stack page
3438 // size, which is needed for guard page handling, stack banging etc.
3439 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3440 // and should be allocated with 64k pages.
3441 //
3442 // So, we do the following:
3443 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3444 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3445 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3446 // 64k no --- AIX 5.2 ? ---
3447 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3448
3449 // We explicitly leave no option to change page size, because only upgrading would work,
3450 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3451
3452 if (g_multipage_support.datapsize == SIZE_4K) {
3453 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3454 if (g_multipage_support.can_use_64K_pages) {
3455 // .. but we are able to use 64K pages dynamically.
3456 // This would be typical for java launchers which are not linked
3457 // with datapsize=64K (like, any other launcher but our own).
3458 //
3459 // In this case it would be smart to allocate the java heap with 64K
3460 // to get the performance benefit, and to fake 64k pages for the
3461 // data segment (when dealing with thread stacks).
3462 //
3463 // However, leave a possibility to downgrade to 4K, using
3464 // -XX:-Use64KPages.
3465 if (Use64KPages) {
3466 trcVerbose("64K page mode (faked for data segment)");
3467 Aix::_page_size = SIZE_64K;
3468 } else {
3469 trcVerbose("4K page mode (Use64KPages=off)");
3470 Aix::_page_size = SIZE_4K;
3471 }
3472 } else {
3473 // .. and not able to allocate 64k pages dynamically. Here, just
3474 // fall back to 4K paged mode and use mmap for everything.
3475 trcVerbose("4K page mode");
3476 Aix::_page_size = SIZE_4K;
3477 FLAG_SET_ERGO(bool, Use64KPages, false);
3478 }
3479 } else {
3480 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3481 // This normally means that we can allocate 64k pages dynamically.
3482 // (There is one special case where this may be false: EXTSHM=on.
3483 // but we decided to not support that mode).
3484 assert0(g_multipage_support.can_use_64K_pages);
3485 Aix::_page_size = SIZE_64K;
3486 trcVerbose("64K page mode");
3487 FLAG_SET_ERGO(bool, Use64KPages, true);
3488 }
3489
3490 // Short-wire stack page size to base page size; if that works, we just remove
3491 // that stack page size altogether.
3492 Aix::_stack_page_size = Aix::_page_size;
3493
3494 // For now UseLargePages is just ignored.
3495 FLAG_SET_ERGO(bool, UseLargePages, false);
3496 _page_sizes[0] = 0;
3497
3498 // debug trace
3499 trcVerbose("os::vm_page_size %s\n", describe_pagesize(os::vm_page_size()));
3500
3501 // Next, we need to initialize libo4 and libperfstat libraries.
3502 if (os::Aix::on_pase()) {
3503 os::Aix::initialize_libo4();
3504 } else {
3505 os::Aix::initialize_libperfstat();
3506 }
3507
3508 // Reset the perfstat information provided by ODM.
3509 if (os::Aix::on_aix()) {
3510 libperfstat::perfstat_reset();
3511 }
3512
3513 // Now initialze basic system properties. Note that for some of the values we
3514 // need libperfstat etc.
3515 os::Aix::initialize_system_info();
3516
3517 _initial_pid = getpid();
3518
3519 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3520
3521 init_random(1234567);
3522
3523 ThreadCritical::initialize();
3524
3525 // Main_thread points to the aboriginal thread.
3526 Aix::_main_thread = pthread_self();
3527
3528 initial_time_count = os::elapsed_counter();
3529
3530 // If the pagesize of the VM is greater than 8K determine the appropriate
3531 // number of initial guard pages. The user can change this with the
3532 // command line arguments, if needed.
3533 if (vm_page_size() > (int)Aix::vm_default_page_size()) {
3534 StackYellowPages = 1;
3535 StackRedPages = 1;
3536 StackShadowPages = round_to((StackShadowPages*Aix::vm_default_page_size()), vm_page_size()) / vm_page_size();
3537 }
3538 }
3539
3540 // This is called _after_ the global arguments have been parsed.
3541 jint os::init_2(void) {
3542
3543 trcVerbose("processor count: %d", os::_processor_count);
3544 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3545
3546 // Initially build up the loaded dll map.
3547 LoadedLibraries::reload();
3548
3549 const int page_size = Aix::page_size();
3550 const int map_size = page_size;
3551
3552 address map_address = (address) MAP_FAILED;
3553 const int prot = PROT_READ;
3554 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3555
3556 // Use optimized addresses for the polling page,
3557 // e.g. map it to a special 32-bit address.
3558 if (OptimizePollingPageLocation) {
3559 // architecture-specific list of address wishes:
3560 address address_wishes[] = {
3561 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3562 // PPC64: all address wishes are non-negative 32 bit values where
3563 // the lower 16 bits are all zero. we can load these addresses
3564 // with a single ppc_lis instruction.
3565 (address) 0x30000000, (address) 0x31000000,
3566 (address) 0x32000000, (address) 0x33000000,
3567 (address) 0x40000000, (address) 0x41000000,
3568 (address) 0x42000000, (address) 0x43000000,
3569 (address) 0x50000000, (address) 0x51000000,
3570 (address) 0x52000000, (address) 0x53000000,
3571 (address) 0x60000000, (address) 0x61000000,
3572 (address) 0x62000000, (address) 0x63000000
3573 };
3574 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3575
3576 // iterate over the list of address wishes:
3577 for (int i=0; i<address_wishes_length; i++) {
3578 // Try to map with current address wish.
3579 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3580 // fail if the address is already mapped.
3581 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3582 map_size, prot,
3583 flags | MAP_FIXED,
3584 -1, 0);
3585 if (Verbose) {
3586 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n",
3587 address_wishes[i], map_address + (ssize_t)page_size);
3588 }
3589
3590 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3591 // Map succeeded and map_address is at wished address, exit loop.
3592 break;
3593 }
3594
3595 if (map_address != (address) MAP_FAILED) {
3596 // Map succeeded, but polling_page is not at wished address, unmap and continue.
3597 ::munmap(map_address, map_size);
3598 map_address = (address) MAP_FAILED;
3599 }
3600 // Map failed, continue loop.
3601 }
3602 } // end OptimizePollingPageLocation
3603
3604 if (map_address == (address) MAP_FAILED) {
3605 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3606 }
3607 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3608 os::set_polling_page(map_address);
3609
3610 if (!UseMembar) {
3611 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3612 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3613 os::set_memory_serialize_page(mem_serialize_page);
3614
3615 #ifndef PRODUCT
3616 if (Verbose && PrintMiscellaneous) {
3617 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page);
3618 }
3619 #endif
3620 }
3621
3622 // initialize suspend/resume support - must do this before signal_sets_init()
3623 if (SR_initialize() != 0) {
3624 perror("SR_initialize failed");
3625 return JNI_ERR;
3626 }
3627
3628 Aix::signal_sets_init();
3629 Aix::install_signal_handlers();
3630
3631 // Check minimum allowable stack size for thread creation and to initialize
3632 // the java system classes, including StackOverflowError - depends on page
3633 // size. Add a page for compiler2 recursion in main thread.
3634 // Add in 2*BytesPerWord times page size to account for VM stack during
3635 // class initialization depending on 32 or 64 bit VM.
3636 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed,
3637 (size_t)(StackYellowPages+StackRedPages+StackShadowPages) * Aix::page_size() +
3638 (2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::vm_default_page_size());
3639
3640 os::Aix::min_stack_allowed = align_size_up(os::Aix::min_stack_allowed, os::Aix::page_size());
3641
3642 size_t threadStackSizeInBytes = ThreadStackSize * K;
3643 if (threadStackSizeInBytes != 0 &&
3644 threadStackSizeInBytes < os::Aix::min_stack_allowed) {
3645 tty->print_cr("\nThe stack size specified is too small, "
3646 "Specify at least %dk",
3647 os::Aix::min_stack_allowed / K);
3648 return JNI_ERR;
3649 }
3650
3651 // Make the stack size a multiple of the page size so that
3652 // the yellow/red zones can be guarded.
3653 // Note that this can be 0, if no default stacksize was set.
3654 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size()));
3655
3656 Aix::libpthread_init();
3657
3658 if (MaxFDLimit) {
3659 // Set the number of file descriptors to max. print out error
3660 // if getrlimit/setrlimit fails but continue regardless.
3661 struct rlimit nbr_files;
3662 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3663 if (status != 0) {
3664 if (PrintMiscellaneous && (Verbose || WizardMode))
3665 perror("os::init_2 getrlimit failed");
3666 } else {
3667 nbr_files.rlim_cur = nbr_files.rlim_max;
3668 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3669 if (status != 0) {
3670 if (PrintMiscellaneous && (Verbose || WizardMode))
3671 perror("os::init_2 setrlimit failed");
3672 }
3673 }
3674 }
3675
3676 if (PerfAllowAtExitRegistration) {
3677 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3678 // Atexit functions can be delayed until process exit time, which
3679 // can be problematic for embedded VM situations. Embedded VMs should
3680 // call DestroyJavaVM() to assure that VM resources are released.
3681
3682 // Note: perfMemory_exit_helper atexit function may be removed in
3683 // the future if the appropriate cleanup code can be added to the
3684 // VM_Exit VMOperation's doit method.
3685 if (atexit(perfMemory_exit_helper) != 0) {
3686 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3687 }
3688 }
3689
3690 return JNI_OK;
3691 }
3692
3693 // Mark the polling page as unreadable
3694 void os::make_polling_page_unreadable(void) {
3695 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3696 fatal("Could not disable polling page");
3697 }
3698 };
3699
3700 // Mark the polling page as readable
3701 void os::make_polling_page_readable(void) {
3702 // Changed according to os_linux.cpp.
3703 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3704 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page));
3705 }
3706 };
3707
3708 int os::active_processor_count() {
3709 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3710 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3711 return online_cpus;
3712 }
3713
3714 void os::set_native_thread_name(const char *name) {
3715 // Not yet implemented.
3716 return;
3717 }
3718
3719 bool os::distribute_processes(uint length, uint* distribution) {
3720 // Not yet implemented.
3721 return false;
3722 }
3723
3724 bool os::bind_to_processor(uint processor_id) {
3725 // Not yet implemented.
3726 return false;
3727 }
3728
3729 void os::SuspendedThreadTask::internal_do_task() {
3730 if (do_suspend(_thread->osthread())) {
3731 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3732 do_task(context);
3733 do_resume(_thread->osthread());
3734 }
3735 }
3736
3737 class PcFetcher : public os::SuspendedThreadTask {
3738 public:
3739 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3740 ExtendedPC result();
3741 protected:
3742 void do_task(const os::SuspendedThreadTaskContext& context);
3743 private:
3744 ExtendedPC _epc;
3745 };
3746
3747 ExtendedPC PcFetcher::result() {
3748 guarantee(is_done(), "task is not done yet.");
3749 return _epc;
3750 }
3751
3752 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3753 Thread* thread = context.thread();
3754 OSThread* osthread = thread->osthread();
3755 if (osthread->ucontext() != NULL) {
3756 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext());
3757 } else {
3758 // NULL context is unexpected, double-check this is the VMThread.
3759 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3760 }
3761 }
3762
3763 // Suspends the target using the signal mechanism and then grabs the PC before
3764 // resuming the target. Used by the flat-profiler only
3765 ExtendedPC os::get_thread_pc(Thread* thread) {
3766 // Make sure that it is called by the watcher for the VMThread.
3767 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3768 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3769
3770 PcFetcher fetcher(thread);
3771 fetcher.run();
3772 return fetcher.result();
3773 }
3774
3775 ////////////////////////////////////////////////////////////////////////////////
3776 // debug support
3777
3778 static address same_page(address x, address y) {
3779 intptr_t page_bits = -os::vm_page_size();
3780 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits))
3781 return x;
3782 else if (x > y)
3783 return (address)(intptr_t(y) | ~page_bits) + 1;
3784 else
3785 return (address)(intptr_t(y) & page_bits);
3786 }
3787
3788 bool os::find(address addr, outputStream* st) {
3789
3790 st->print(PTR_FORMAT ": ", addr);
3791
3792 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr);
3793 if (lib) {
3794 lib->print(st);
3795 return true;
3796 } else {
3797 lib = LoadedLibraries::find_for_data_address(addr);
3798 if (lib) {
3799 lib->print(st);
3800 return true;
3801 } else {
3802 st->print_cr("(outside any module)");
3803 }
3804 }
3805
3806 return false;
3807 }
3808
3809 ////////////////////////////////////////////////////////////////////////////////
3810 // misc
3811
3812 // This does not do anything on Aix. This is basically a hook for being
3813 // able to use structured exception handling (thread-local exception filters)
3814 // on, e.g., Win32.
3815 void
3816 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
3817 JavaCallArguments* args, Thread* thread) {
3818 f(value, method, args, thread);
3819 }
3820
3821 void os::print_statistics() {
3822 }
3823
3824 int os::message_box(const char* title, const char* message) {
3825 int i;
3826 fdStream err(defaultStream::error_fd());
3827 for (i = 0; i < 78; i++) err.print_raw("=");
3828 err.cr();
3829 err.print_raw_cr(title);
3830 for (i = 0; i < 78; i++) err.print_raw("-");
3831 err.cr();
3832 err.print_raw_cr(message);
3833 for (i = 0; i < 78; i++) err.print_raw("=");
3834 err.cr();
3835
3836 char buf[16];
3837 // Prevent process from exiting upon "read error" without consuming all CPU
3838 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3839
3840 return buf[0] == 'y' || buf[0] == 'Y';
3841 }
3842
3843 int os::stat(const char *path, struct stat *sbuf) {
3844 char pathbuf[MAX_PATH];
3845 if (strlen(path) > MAX_PATH - 1) {
3846 errno = ENAMETOOLONG;
3847 return -1;
3848 }
3849 os::native_path(strcpy(pathbuf, path));
3850 return ::stat(pathbuf, sbuf);
3851 }
3852
3853 bool os::check_heap(bool force) {
3854 return true;
3855 }
3856
3857 // Is a (classpath) directory empty?
3858 bool os::dir_is_empty(const char* path) {
3859 DIR *dir = NULL;
3860 struct dirent *ptr;
3861
3862 dir = opendir(path);
3863 if (dir == NULL) return true;
3864
3865 /* Scan the directory */
3866 bool result = true;
3867 char buf[sizeof(struct dirent) + MAX_PATH];
3868 while (result && (ptr = ::readdir(dir)) != NULL) {
3869 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3870 result = false;
3871 }
3872 }
3873 closedir(dir);
3874 return result;
3875 }
3876
3877 // This code originates from JDK's sysOpen and open64_w
3878 // from src/solaris/hpi/src/system_md.c
3879
3880 int os::open(const char *path, int oflag, int mode) {
3881
3882 if (strlen(path) > MAX_PATH - 1) {
3883 errno = ENAMETOOLONG;
3884 return -1;
3885 }
3886 int fd;
3887
3888 fd = ::open64(path, oflag, mode);
3889 if (fd == -1) return -1;
3890
3891 // If the open succeeded, the file might still be a directory.
3892 {
3893 struct stat64 buf64;
3894 int ret = ::fstat64(fd, &buf64);
3895 int st_mode = buf64.st_mode;
3896
3897 if (ret != -1) {
3898 if ((st_mode & S_IFMT) == S_IFDIR) {
3899 errno = EISDIR;
3900 ::close(fd);
3901 return -1;
3902 }
3903 } else {
3904 ::close(fd);
3905 return -1;
3906 }
3907 }
3908
3909 // All file descriptors that are opened in the JVM and not
3910 // specifically destined for a subprocess should have the
3911 // close-on-exec flag set. If we don't set it, then careless 3rd
3912 // party native code might fork and exec without closing all
3913 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3914 // UNIXProcess.c), and this in turn might:
3915 //
3916 // - cause end-of-file to fail to be detected on some file
3917 // descriptors, resulting in mysterious hangs, or
3918 //
3919 // - might cause an fopen in the subprocess to fail on a system
3920 // suffering from bug 1085341.
3921 //
3922 // (Yes, the default setting of the close-on-exec flag is a Unix
3923 // design flaw.)
3924 //
3925 // See:
3926 // 1085341: 32-bit stdio routines should support file descriptors >255
3927 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3928 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3929 #ifdef FD_CLOEXEC
3930 {
3931 int flags = ::fcntl(fd, F_GETFD);
3932 if (flags != -1)
3933 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3934 }
3935 #endif
3936
3937 return fd;
3938 }
3939
3940 // create binary file, rewriting existing file if required
3941 int os::create_binary_file(const char* path, bool rewrite_existing) {
3942 int oflags = O_WRONLY | O_CREAT;
3943 if (!rewrite_existing) {
3944 oflags |= O_EXCL;
3945 }
3946 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3947 }
3948
3949 // return current position of file pointer
3950 jlong os::current_file_offset(int fd) {
3951 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3952 }
3953
3954 // move file pointer to the specified offset
3955 jlong os::seek_to_file_offset(int fd, jlong offset) {
3956 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3957 }
3958
3959 // This code originates from JDK's sysAvailable
3960 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3961
3962 int os::available(int fd, jlong *bytes) {
3963 jlong cur, end;
3964 int mode;
3965 struct stat64 buf64;
3966
3967 if (::fstat64(fd, &buf64) >= 0) {
3968 mode = buf64.st_mode;
3969 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3970 // XXX: is the following call interruptible? If so, this might
3971 // need to go through the INTERRUPT_IO() wrapper as for other
3972 // blocking, interruptible calls in this file.
3973 int n;
3974 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3975 *bytes = n;
3976 return 1;
3977 }
3978 }
3979 }
3980 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3981 return 0;
3982 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3983 return 0;
3984 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3985 return 0;
3986 }
3987 *bytes = end - cur;
3988 return 1;
3989 }
3990
3991 // Map a block of memory.
3992 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3993 char *addr, size_t bytes, bool read_only,
3994 bool allow_exec) {
3995 int prot;
3996 int flags = MAP_PRIVATE;
3997
3998 if (read_only) {
3999 prot = PROT_READ;
4000 flags = MAP_SHARED;
4001 } else {
4002 prot = PROT_READ | PROT_WRITE;
4003 flags = MAP_PRIVATE;
4004 }
4005
4006 if (allow_exec) {
4007 prot |= PROT_EXEC;
4008 }
4009
4010 if (addr != NULL) {
4011 flags |= MAP_FIXED;
4012 }
4013
4014 // Allow anonymous mappings if 'fd' is -1.
4015 if (fd == -1) {
4016 flags |= MAP_ANONYMOUS;
4017 }
4018
4019 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
4020 fd, file_offset);
4021 if (mapped_address == MAP_FAILED) {
4022 return NULL;
4023 }
4024 return mapped_address;
4025 }
4026
4027 // Remap a block of memory.
4028 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
4029 char *addr, size_t bytes, bool read_only,
4030 bool allow_exec) {
4031 // same as map_memory() on this OS
4032 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
4033 allow_exec);
4034 }
4035
4036 // Unmap a block of memory.
4037 bool os::pd_unmap_memory(char* addr, size_t bytes) {
4038 return munmap(addr, bytes) == 0;
4039 }
4040
4041 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
4042 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
4043 // of a thread.
4044 //
4045 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
4046 // the fast estimate available on the platform.
4047
4048 jlong os::current_thread_cpu_time() {
4049 // return user + sys since the cost is the same
4050 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
4051 assert(n >= 0, "negative CPU time");
4052 return n;
4053 }
4054
4055 jlong os::thread_cpu_time(Thread* thread) {
4056 // consistent with what current_thread_cpu_time() returns
4057 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
4058 assert(n >= 0, "negative CPU time");
4059 return n;
4060 }
4061
4062 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
4063 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
4064 assert(n >= 0, "negative CPU time");
4065 return n;
4066 }
4067
4068 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
4069 bool error = false;
4070
4071 jlong sys_time = 0;
4072 jlong user_time = 0;
4073
4074 // Reimplemented using getthrds64().
4075 //
4076 // Works like this:
4077 // For the thread in question, get the kernel thread id. Then get the
4078 // kernel thread statistics using that id.
4079 //
4080 // This only works of course when no pthread scheduling is used,
4081 // i.e. there is a 1:1 relationship to kernel threads.
4082 // On AIX, see AIXTHREAD_SCOPE variable.
4083
4084 pthread_t pthtid = thread->osthread()->pthread_id();
4085
4086 // retrieve kernel thread id for the pthread:
4087 tid64_t tid = 0;
4088 struct __pthrdsinfo pinfo;
4089 // I just love those otherworldly IBM APIs which force me to hand down
4090 // dummy buffers for stuff I dont care for...
4091 char dummy[1];
4092 int dummy_size = sizeof(dummy);
4093 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4094 dummy, &dummy_size) == 0) {
4095 tid = pinfo.__pi_tid;
4096 } else {
4097 tty->print_cr("pthread_getthrds_np failed.");
4098 error = true;
4099 }
4100
4101 // retrieve kernel timing info for that kernel thread
4102 if (!error) {
4103 struct thrdentry64 thrdentry;
4104 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4105 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4106 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4107 } else {
4108 tty->print_cr("pthread_getthrds_np failed.");
4109 error = true;
4110 }
4111 }
4112
4113 if (p_sys_time) {
4114 *p_sys_time = sys_time;
4115 }
4116
4117 if (p_user_time) {
4118 *p_user_time = user_time;
4119 }
4120
4121 if (error) {
4122 return false;
4123 }
4124
4125 return true;
4126 }
4127
4128 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4129 jlong sys_time;
4130 jlong user_time;
4131
4132 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4133 return -1;
4134 }
4135
4136 return user_sys_cpu_time ? sys_time + user_time : user_time;
4137 }
4138
4139 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4140 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4141 info_ptr->may_skip_backward = false; // elapsed time not wall time
4142 info_ptr->may_skip_forward = false; // elapsed time not wall time
4143 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4144 }
4145
4146 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4147 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4148 info_ptr->may_skip_backward = false; // elapsed time not wall time
4149 info_ptr->may_skip_forward = false; // elapsed time not wall time
4150 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4151 }
4152
4153 bool os::is_thread_cpu_time_supported() {
4154 return true;
4155 }
4156
4157 // System loadavg support. Returns -1 if load average cannot be obtained.
4158 // For now just return the system wide load average (no processor sets).
4159 int os::loadavg(double values[], int nelem) {
4160
4161 // Implemented using libperfstat on AIX.
4162
4163 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4164 guarantee(values, "argument error");
4165
4166 if (os::Aix::on_pase()) {
4167 Unimplemented();
4168 return -1;
4169 } else {
4170 // AIX: use libperfstat
4171 //
4172 // See also:
4173 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm
4174 // /usr/include/libperfstat.h:
4175
4176 // Use the already AIX version independent get_cpuinfo.
4177 os::Aix::cpuinfo_t ci;
4178 if (os::Aix::get_cpuinfo(&ci)) {
4179 for (int i = 0; i < nelem; i++) {
4180 values[i] = ci.loadavg[i];
4181 }
4182 } else {
4183 return -1;
4184 }
4185 return nelem;
4186 }
4187 }
4188
4189 void os::pause() {
4190 char filename[MAX_PATH];
4191 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4192 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4193 } else {
4194 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4195 }
4196
4197 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4198 if (fd != -1) {
4199 struct stat buf;
4200 ::close(fd);
4201 while (::stat(filename, &buf) == 0) {
4202 (void)::poll(NULL, 0, 100);
4203 }
4204 } else {
4205 jio_fprintf(stderr,
4206 "Could not open pause file '%s', continuing immediately.\n", filename);
4207 }
4208 }
4209
4210 bool os::Aix::is_primordial_thread() {
4211 if (pthread_self() == (pthread_t)1) {
4212 return true;
4213 } else {
4214 return false;
4215 }
4216 }
4217
4218 // OS recognitions (PASE/AIX, OS level) call this before calling any
4219 // one of Aix::on_pase(), Aix::os_version() static
4220 void os::Aix::initialize_os_info() {
4221
4222 assert(_on_pase == -1 && _os_version == -1, "already called.");
4223
4224 struct utsname uts;
4225 memset(&uts, 0, sizeof(uts));
4226 strcpy(uts.sysname, "?");
4227 if (::uname(&uts) == -1) {
4228 trc("uname failed (%d)", errno);
4229 guarantee(0, "Could not determine whether we run on AIX or PASE");
4230 } else {
4231 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4232 "node \"%s\" machine \"%s\"\n",
4233 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4234 const int major = atoi(uts.version);
4235 assert(major > 0, "invalid OS version");
4236 const int minor = atoi(uts.release);
4237 assert(minor > 0, "invalid OS release");
4238 _os_version = (major << 8) | minor;
4239 if (strcmp(uts.sysname, "OS400") == 0) {
4240 Unimplemented();
4241 } else if (strcmp(uts.sysname, "AIX") == 0) {
4242 // We run on AIX. We do not support versions older than AIX 5.3.
4243 _on_pase = 0;
4244 if (_os_version < 0x0503) {
4245 trc("AIX release older than AIX 5.3 not supported.");
4246 assert(false, "AIX release too old.");
4247 } else {
4248 trcVerbose("We run on AIX %d.%d\n", major, minor);
4249 }
4250 } else {
4251 assert(false, "unknown OS");
4252 }
4253 }
4254
4255 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4256 } // end: os::Aix::initialize_os_info()
4257
4258 // Scan environment for important settings which might effect the VM.
4259 // Trace out settings. Warn about invalid settings and/or correct them.
4260 //
4261 // Must run after os::Aix::initialue_os_info().
4262 void os::Aix::scan_environment() {
4263
4264 char* p;
4265 int rc;
4266
4267 // Warn explicity if EXTSHM=ON is used. That switch changes how
4268 // System V shared memory behaves. One effect is that page size of
4269 // shared memory cannot be change dynamically, effectivly preventing
4270 // large pages from working.
4271 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4272 // recommendation is (in OSS notes) to switch it off.
4273 p = ::getenv("EXTSHM");
4274 if (Verbose) {
4275 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>");
4276 }
4277 if (p && strcasecmp(p, "ON") == 0) {
4278 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n");
4279 _extshm = 1;
4280 } else {
4281 _extshm = 0;
4282 }
4283
4284 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4285 // Not tested, not supported.
4286 //
4287 // Note that it might be worth the trouble to test and to require it, if only to
4288 // get useful return codes for mprotect.
4289 //
4290 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4291 // exec() ? before loading the libjvm ? ....)
4292 p = ::getenv("XPG_SUS_ENV");
4293 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4294 if (p && strcmp(p, "ON") == 0) {
4295 _xpg_sus_mode = 1;
4296 trc("Unsupported setting: XPG_SUS_ENV=ON");
4297 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4298 // clobber address ranges. If we ever want to support that, we have to do some
4299 // testing first.
4300 guarantee(false, "XPG_SUS_ENV=ON not supported");
4301 } else {
4302 _xpg_sus_mode = 0;
4303 }
4304
4305 // Switch off AIX internal (pthread) guard pages. This has
4306 // immediate effect for any pthread_create calls which follow.
4307 p = ::getenv("AIXTHREAD_GUARDPAGES");
4308 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4309 rc = ::putenv("AIXTHREAD_GUARDPAGES=0");
4310 guarantee(rc == 0, "");
4311
4312 } // end: os::Aix::scan_environment()
4313
4314 // PASE: initialize the libo4 library (AS400 PASE porting library).
4315 void os::Aix::initialize_libo4() {
4316 Unimplemented();
4317 }
4318
4319 // AIX: initialize the libperfstat library (we load this dynamically
4320 // because it is only available on AIX.
4321 void os::Aix::initialize_libperfstat() {
4322
4323 assert(os::Aix::on_aix(), "AIX only");
4324
4325 if (!libperfstat::init()) {
4326 trc("libperfstat initialization failed.");
4327 assert(false, "libperfstat initialization failed");
4328 } else {
4329 if (Verbose) {
4330 fprintf(stderr, "libperfstat initialized.\n");
4331 }
4332 }
4333 } // end: os::Aix::initialize_libperfstat
4334
4335 /////////////////////////////////////////////////////////////////////////////
4336 // thread stack
4337
4338 // Function to query the current stack size using pthread_getthrds_np.
4339 static bool query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) {
4340 // This only works when invoked on a pthread. As we agreed not to use
4341 // primordial threads anyway, I assert here.
4342 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread");
4343
4344 // Information about this api can be found (a) in the pthread.h header and
4345 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm
4346 //
4347 // The use of this API to find out the current stack is kind of undefined.
4348 // But after a lot of tries and asking IBM about it, I concluded that it is safe
4349 // enough for cases where I let the pthread library create its stacks. For cases
4350 // where I create an own stack and pass this to pthread_create, it seems not to
4351 // work (the returned stack size in that case is 0).
4352
4353 pthread_t tid = pthread_self();
4354 struct __pthrdsinfo pinfo;
4355 char dummy[1]; // We only need this to satisfy the api and to not get E.
4356 int dummy_size = sizeof(dummy);
4357
4358 memset(&pinfo, 0, sizeof(pinfo));
4359
4360 const int rc = pthread_getthrds_np(&tid, PTHRDSINFO_QUERY_ALL, &pinfo,
4361 sizeof(pinfo), dummy, &dummy_size);
4362
4363 if (rc != 0) {
4364 assert0(false);
4365 trcVerbose("pthread_getthrds_np failed (%d)", rc);
4366 return false;
4367 }
4368 guarantee0(pinfo.__pi_stackend);
4369
4370 // The following can happen when invoking pthread_getthrds_np on a pthread running
4371 // on a user provided stack (when handing down a stack to pthread create, see
4372 // pthread_attr_setstackaddr).
4373 // Not sure what to do here - I feel inclined to forbid this use case completely.
4374 guarantee0(pinfo.__pi_stacksize);
4375
4376 // Note: the pthread stack on AIX seems to look like this:
4377 //
4378 // --------------------- real base ? at page border ?
4379 //
4380 // pthread internal data, like ~2K, see also
4381 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/thread_supp_tun_params.htm
4382 //
4383 // --------------------- __pi_stackend - not page aligned, (xxxxF890)
4384 //
4385 // stack
4386 // ....
4387 //
4388 // stack
4389 //
4390 // --------------------- __pi_stackend - __pi_stacksize
4391 //
4392 // padding due to AIX guard pages (?) see AIXTHREAD_GUARDPAGES
4393 // --------------------- __pi_stackaddr (page aligned if AIXTHREAD_GUARDPAGES > 0)
4394 //
4395 // AIX guard pages (?)
4396 //
4397
4398 // So, the safe thing to do is to use the area from __pi_stackend to __pi_stackaddr;
4399 // __pi_stackend however is almost never page aligned.
4400 //
4401
4402 if (p_stack_base) {
4403 (*p_stack_base) = (address) (pinfo.__pi_stackend);
4404 }
4405
4406 if (p_stack_size) {
4407 (*p_stack_size) = pinfo.__pi_stackend - pinfo.__pi_stackaddr;
4408 }
4409
4410 return true;
4411 }
4412
4413 // Get the current stack base from the OS (actually, the pthread library).
4414 address os::current_stack_base() {
4415 address p;
4416 query_stack_dimensions(&p, 0);
4417 return p;
4418 }
4419
4420 // Get the current stack size from the OS (actually, the pthread library).
4421 size_t os::current_stack_size() {
4422 size_t s;
4423 query_stack_dimensions(0, &s);
4424 return s;
4425 }
4426
4427 // Refer to the comments in os_solaris.cpp park-unpark.
4428 //
4429 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can
4430 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable.
4431 // For specifics regarding the bug see GLIBC BUGID 261237 :
4432 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html.
4433 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future
4434 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar
4435 // is used. (The simple C test-case provided in the GLIBC bug report manifests the
4436 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos()
4437 // and monitorenter when we're using 1-0 locking. All those operations may result in
4438 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version
4439 // of libpthread avoids the problem, but isn't practical.
4440 //
4441 // Possible remedies:
4442 //
4443 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work.
4444 // This is palliative and probabilistic, however. If the thread is preempted
4445 // between the call to compute_abstime() and pthread_cond_timedwait(), more
4446 // than the minimum period may have passed, and the abstime may be stale (in the
4447 // past) resultin in a hang. Using this technique reduces the odds of a hang
4448 // but the JVM is still vulnerable, particularly on heavily loaded systems.
4449 //
4450 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead
4451 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set
4452 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo)
4453 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant
4454 // thread.
4455 //
4456 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread
4457 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing
4458 // a timeout request to the chron thread and then blocking via pthread_cond_wait().
4459 // This also works well. In fact it avoids kernel-level scalability impediments
4460 // on certain platforms that don't handle lots of active pthread_cond_timedwait()
4461 // timers in a graceful fashion.
4462 //
4463 // 4. When the abstime value is in the past it appears that control returns
4464 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt.
4465 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we
4466 // can avoid the problem by reinitializing the condvar -- by cond_destroy()
4467 // followed by cond_init() -- after all calls to pthread_cond_timedwait().
4468 // It may be possible to avoid reinitialization by checking the return
4469 // value from pthread_cond_timedwait(). In addition to reinitializing the
4470 // condvar we must establish the invariant that cond_signal() is only called
4471 // within critical sections protected by the adjunct mutex. This prevents
4472 // cond_signal() from "seeing" a condvar that's in the midst of being
4473 // reinitialized or that is corrupt. Sadly, this invariant obviates the
4474 // desirable signal-after-unlock optimization that avoids futile context switching.
4475 //
4476 // I'm also concerned that some versions of NTPL might allocate an auxilliary
4477 // structure when a condvar is used or initialized. cond_destroy() would
4478 // release the helper structure. Our reinitialize-after-timedwait fix
4479 // put excessive stress on malloc/free and locks protecting the c-heap.
4480 //
4481 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag.
4482 // It may be possible to refine (4) by checking the kernel and NTPL verisons
4483 // and only enabling the work-around for vulnerable environments.
4484
4485 // utility to compute the abstime argument to timedwait:
4486 // millis is the relative timeout time
4487 // abstime will be the absolute timeout time
4488 // TODO: replace compute_abstime() with unpackTime()
4489
4490 static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
4491 if (millis < 0) millis = 0;
4492 struct timeval now;
4493 int status = gettimeofday(&now, NULL);
4494 assert(status == 0, "gettimeofday");
4495 jlong seconds = millis / 1000;
4496 millis %= 1000;
4497 if (seconds > 50000000) { // see man cond_timedwait(3T)
4498 seconds = 50000000;
4499 }
4500 abstime->tv_sec = now.tv_sec + seconds;
4501 long usec = now.tv_usec + millis * 1000;
4502 if (usec >= 1000000) {
4503 abstime->tv_sec += 1;
4504 usec -= 1000000;
4505 }
4506 abstime->tv_nsec = usec * 1000;
4507 return abstime;
4508 }
4509
4510 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately.
4511 // Conceptually TryPark() should be equivalent to park(0).
4512
4513 int os::PlatformEvent::TryPark() {
4514 for (;;) {
4515 const int v = _Event;
4516 guarantee ((v == 0) || (v == 1), "invariant");
4517 if (Atomic::cmpxchg (0, &_Event, v) == v) return v;
4518 }
4519 }
4520
4521 void os::PlatformEvent::park() { // AKA "down()"
4522 // Invariant: Only the thread associated with the Event/PlatformEvent
4523 // may call park().
4524 // TODO: assert that _Assoc != NULL or _Assoc == Self
4525 int v;
4526 for (;;) {
4527 v = _Event;
4528 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4529 }
4530 guarantee (v >= 0, "invariant");
4531 if (v == 0) {
4532 // Do this the hard way by blocking ...
4533 int status = pthread_mutex_lock(_mutex);
4534 assert_status(status == 0, status, "mutex_lock");
4535 guarantee (_nParked == 0, "invariant");
4536 ++ _nParked;
4537 while (_Event < 0) {
4538 status = pthread_cond_wait(_cond, _mutex);
4539 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait");
4540 }
4541 -- _nParked;
4542
4543 // In theory we could move the ST of 0 into _Event past the unlock(),
4544 // but then we'd need a MEMBAR after the ST.
4545 _Event = 0;
4546 status = pthread_mutex_unlock(_mutex);
4547 assert_status(status == 0, status, "mutex_unlock");
4548 }
4549 guarantee (_Event >= 0, "invariant");
4550 }
4551
4552 int os::PlatformEvent::park(jlong millis) {
4553 guarantee (_nParked == 0, "invariant");
4554
4555 int v;
4556 for (;;) {
4557 v = _Event;
4558 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break;
4559 }
4560 guarantee (v >= 0, "invariant");
4561 if (v != 0) return OS_OK;
4562
4563 // We do this the hard way, by blocking the thread.
4564 // Consider enforcing a minimum timeout value.
4565 struct timespec abst;
4566 compute_abstime(&abst, millis);
4567
4568 int ret = OS_TIMEOUT;
4569 int status = pthread_mutex_lock(_mutex);
4570 assert_status(status == 0, status, "mutex_lock");
4571 guarantee (_nParked == 0, "invariant");
4572 ++_nParked;
4573
4574 // Object.wait(timo) will return because of
4575 // (a) notification
4576 // (b) timeout
4577 // (c) thread.interrupt
4578 //
4579 // Thread.interrupt and object.notify{All} both call Event::set.
4580 // That is, we treat thread.interrupt as a special case of notification.
4581 // We ignore spurious OS wakeups unless FilterSpuriousWakeups is false.
4582 // We assume all ETIME returns are valid.
4583 //
4584 // TODO: properly differentiate simultaneous notify+interrupt.
4585 // In that case, we should propagate the notify to another waiter.
4586
4587 while (_Event < 0) {
4588 status = pthread_cond_timedwait(_cond, _mutex, &abst);
4589 assert_status(status == 0 || status == ETIMEDOUT,
4590 status, "cond_timedwait");
4591 if (!FilterSpuriousWakeups) break; // previous semantics
4592 if (status == ETIMEDOUT) break;
4593 // We consume and ignore EINTR and spurious wakeups.
4594 }
4595 --_nParked;
4596 if (_Event >= 0) {
4597 ret = OS_OK;
4598 }
4599 _Event = 0;
4600 status = pthread_mutex_unlock(_mutex);
4601 assert_status(status == 0, status, "mutex_unlock");
4602 assert (_nParked == 0, "invariant");
4603 return ret;
4604 }
4605
4606 void os::PlatformEvent::unpark() {
4607 int v, AnyWaiters;
4608 for (;;) {
4609 v = _Event;
4610 if (v > 0) {
4611 // The LD of _Event could have reordered or be satisfied
4612 // by a read-aside from this processor's write buffer.
4613 // To avoid problems execute a barrier and then
4614 // ratify the value.
4615 OrderAccess::fence();
4616 if (_Event == v) return;
4617 continue;
4618 }
4619 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break;
4620 }
4621 if (v < 0) {
4622 // Wait for the thread associated with the event to vacate
4623 int status = pthread_mutex_lock(_mutex);
4624 assert_status(status == 0, status, "mutex_lock");
4625 AnyWaiters = _nParked;
4626
4627 if (AnyWaiters != 0) {
4628 // We intentional signal *after* dropping the lock
4629 // to avoid a common class of futile wakeups.
4630 status = pthread_cond_signal(_cond);
4631 assert_status(status == 0, status, "cond_signal");
4632 }
4633 // Mutex should be locked for pthread_cond_signal(_cond).
4634 status = pthread_mutex_unlock(_mutex);
4635 assert_status(status == 0, status, "mutex_unlock");
4636 }
4637
4638 // Note that we signal() _after dropping the lock for "immortal" Events.
4639 // This is safe and avoids a common class of futile wakeups. In rare
4640 // circumstances this can cause a thread to return prematurely from
4641 // cond_{timed}wait() but the spurious wakeup is benign and the victim will
4642 // simply re-test the condition and re-park itself.
4643 }
4644
4645
4646 // JSR166
4647 // -------------------------------------------------------
4648
4649 //
4650 // The solaris and linux implementations of park/unpark are fairly
4651 // conservative for now, but can be improved. They currently use a
4652 // mutex/condvar pair, plus a a count.
4653 // Park decrements count if > 0, else does a condvar wait. Unpark
4654 // sets count to 1 and signals condvar. Only one thread ever waits
4655 // on the condvar. Contention seen when trying to park implies that someone
4656 // is unparking you, so don't wait. And spurious returns are fine, so there
4657 // is no need to track notifications.
4658 //
4659
4660 #define MAX_SECS 100000000
4661 //
4662 // This code is common to linux and solaris and will be moved to a
4663 // common place in dolphin.
4664 //
4665 // The passed in time value is either a relative time in nanoseconds
4666 // or an absolute time in milliseconds. Either way it has to be unpacked
4667 // into suitable seconds and nanoseconds components and stored in the
4668 // given timespec structure.
4669 // Given time is a 64-bit value and the time_t used in the timespec is only
4670 // a signed-32-bit value (except on 64-bit Linux) we have to watch for
4671 // overflow if times way in the future are given. Further on Solaris versions
4672 // prior to 10 there is a restriction (see cond_timedwait) that the specified
4673 // number of seconds, in abstime, is less than current_time + 100,000,000.
4674 // As it will be 28 years before "now + 100000000" will overflow we can
4675 // ignore overflow and just impose a hard-limit on seconds using the value
4676 // of "now + 100,000,000". This places a limit on the timeout of about 3.17
4677 // years from "now".
4678 //
4679
4680 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
4681 assert (time > 0, "convertTime");
4682
4683 struct timeval now;
4684 int status = gettimeofday(&now, NULL);
4685 assert(status == 0, "gettimeofday");
4686
4687 time_t max_secs = now.tv_sec + MAX_SECS;
4688
4689 if (isAbsolute) {
4690 jlong secs = time / 1000;
4691 if (secs > max_secs) {
4692 absTime->tv_sec = max_secs;
4693 }
4694 else {
4695 absTime->tv_sec = secs;
4696 }
4697 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC;
4698 }
4699 else {
4700 jlong secs = time / NANOSECS_PER_SEC;
4701 if (secs >= MAX_SECS) {
4702 absTime->tv_sec = max_secs;
4703 absTime->tv_nsec = 0;
4704 }
4705 else {
4706 absTime->tv_sec = now.tv_sec + secs;
4707 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000;
4708 if (absTime->tv_nsec >= NANOSECS_PER_SEC) {
4709 absTime->tv_nsec -= NANOSECS_PER_SEC;
4710 ++absTime->tv_sec; // note: this must be <= max_secs
4711 }
4712 }
4713 }
4714 assert(absTime->tv_sec >= 0, "tv_sec < 0");
4715 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs");
4716 assert(absTime->tv_nsec >= 0, "tv_nsec < 0");
4717 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec");
4718 }
4719
4720 void Parker::park(bool isAbsolute, jlong time) {
4721 // Optional fast-path check:
4722 // Return immediately if a permit is available.
4723 if (_counter > 0) {
4724 _counter = 0;
4725 OrderAccess::fence();
4726 return;
4727 }
4728
4729 Thread* thread = Thread::current();
4730 assert(thread->is_Java_thread(), "Must be JavaThread");
4731 JavaThread *jt = (JavaThread *)thread;
4732
4733 // Optional optimization -- avoid state transitions if there's an interrupt pending.
4734 // Check interrupt before trying to wait
4735 if (Thread::is_interrupted(thread, false)) {
4736 return;
4737 }
4738
4739 // Next, demultiplex/decode time arguments
4740 timespec absTime;
4741 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all
4742 return;
4743 }
4744 if (time > 0) {
4745 unpackTime(&absTime, isAbsolute, time);
4746 }
4747
4748 // Enter safepoint region
4749 // Beware of deadlocks such as 6317397.
4750 // The per-thread Parker:: mutex is a classic leaf-lock.
4751 // In particular a thread must never block on the Threads_lock while
4752 // holding the Parker:: mutex. If safepoints are pending both the
4753 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock.
4754 ThreadBlockInVM tbivm(jt);
4755
4756 // Don't wait if cannot get lock since interference arises from
4757 // unblocking. Also. check interrupt before trying wait
4758 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) {
4759 return;
4760 }
4761
4762 int status;
4763 if (_counter > 0) { // no wait needed
4764 _counter = 0;
4765 status = pthread_mutex_unlock(_mutex);
4766 assert (status == 0, "invariant");
4767 OrderAccess::fence();
4768 return;
4769 }
4770
4771 #ifdef ASSERT
4772 // Don't catch signals while blocked; let the running threads have the signals.
4773 // (This allows a debugger to break into the running thread.)
4774 sigset_t oldsigs;
4775 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals();
4776 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs);
4777 #endif
4778
4779 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
4780 jt->set_suspend_equivalent();
4781 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
4782
4783 if (time == 0) {
4784 status = pthread_cond_wait (_cond, _mutex);
4785 } else {
4786 status = pthread_cond_timedwait (_cond, _mutex, &absTime);
4787 if (status != 0 && WorkAroundNPTLTimedWaitHang) {
4788 pthread_cond_destroy (_cond);
4789 pthread_cond_init (_cond, NULL);
4790 }
4791 }
4792 assert_status(status == 0 || status == EINTR ||
4793 status == ETIME || status == ETIMEDOUT,
4794 status, "cond_timedwait");
4795
4796 #ifdef ASSERT
4797 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL);
4798 #endif
4799
4800 _counter = 0;
4801 status = pthread_mutex_unlock(_mutex);
4802 assert_status(status == 0, status, "invariant");
4803 // If externally suspended while waiting, re-suspend
4804 if (jt->handle_special_suspend_equivalent_condition()) {
4805 jt->java_suspend_self();
4806 }
4807
4808 OrderAccess::fence();
4809 }
4810
4811 void Parker::unpark() {
4812 int s, status;
4813 status = pthread_mutex_lock(_mutex);
4814 assert (status == 0, "invariant");
4815 s = _counter;
4816 _counter = 1;
4817 if (s < 1) {
4818 if (WorkAroundNPTLTimedWaitHang) {
4819 status = pthread_cond_signal (_cond);
4820 assert (status == 0, "invariant");
4821 status = pthread_mutex_unlock(_mutex);
4822 assert (status == 0, "invariant");
4823 } else {
4824 status = pthread_mutex_unlock(_mutex);
4825 assert (status == 0, "invariant");
4826 status = pthread_cond_signal (_cond);
4827 assert (status == 0, "invariant");
4828 }
4829 } else {
4830 pthread_mutex_unlock(_mutex);
4831 assert (status == 0, "invariant");
4832 }
4833 }
4834
4835 extern char** environ;
4836
4837 // Run the specified command in a separate process. Return its exit value,
4838 // or -1 on failure (e.g. can't fork a new process).
4839 // Unlike system(), this function can be called from signal handler. It
4840 // doesn't block SIGINT et al.
4841 int os::fork_and_exec(char* cmd) {
4842 char * argv[4] = {"sh", "-c", cmd, NULL};
4843
4844 pid_t pid = fork();
4845
4846 if (pid < 0) {
4847 // fork failed
4848 return -1;
4849
4850 } else if (pid == 0) {
4851 // child process
4852
4853 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4854 execve("/usr/bin/sh", argv, environ);
4855
4856 // execve failed
4857 _exit(-1);
4858
4859 } else {
4860 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4861 // care about the actual exit code, for now.
4862
4863 int status;
4864
4865 // Wait for the child process to exit. This returns immediately if
4866 // the child has already exited. */
4867 while (waitpid(pid, &status, 0) < 0) {
4868 switch (errno) {
4869 case ECHILD: return 0;
4870 case EINTR: break;
4871 default: return -1;
4872 }
4873 }
4874
4875 if (WIFEXITED(status)) {
4876 // The child exited normally; get its exit code.
4877 return WEXITSTATUS(status);
4878 } else if (WIFSIGNALED(status)) {
4879 // The child exited because of a signal.
4880 // The best value to return is 0x80 + signal number,
4881 // because that is what all Unix shells do, and because
4882 // it allows callers to distinguish between process exit and
4883 // process death by signal.
4884 return 0x80 + WTERMSIG(status);
4885 } else {
4886 // Unknown exit code; pass it through.
4887 return status;
4888 }
4889 }
4890 return -1;
4891 }
4892
4893 // is_headless_jre()
4894 //
4895 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4896 // in order to report if we are running in a headless jre.
4897 //
4898 // Since JDK8 xawt/libmawt.so is moved into the same directory
4899 // as libawt.so, and renamed libawt_xawt.so
4900 bool os::is_headless_jre() {
4901 struct stat statbuf;
4902 char buf[MAXPATHLEN];
4903 char libmawtpath[MAXPATHLEN];
4904 const char *xawtstr = "/xawt/libmawt.so";
4905 const char *new_xawtstr = "/libawt_xawt.so";
4906
4907 char *p;
4908
4909 // Get path to libjvm.so
4910 os::jvm_path(buf, sizeof(buf));
4911
4912 // Get rid of libjvm.so
4913 p = strrchr(buf, '/');
4914 if (p == NULL) return false;
4915 else *p = '\0';
4916
4917 // Get rid of client or server
4918 p = strrchr(buf, '/');
4919 if (p == NULL) return false;
4920 else *p = '\0';
4921
4922 // check xawt/libmawt.so
4923 strcpy(libmawtpath, buf);
4924 strcat(libmawtpath, xawtstr);
4925 if (::stat(libmawtpath, &statbuf) == 0) return false;
4926
4927 // check libawt_xawt.so
4928 strcpy(libmawtpath, buf);
4929 strcat(libmawtpath, new_xawtstr);
4930 if (::stat(libmawtpath, &statbuf) == 0) return false;
4931
4932 return true;
4933 }
4934
4935 // Get the default path to the core file
4936 // Returns the length of the string
4937 int os::get_core_path(char* buffer, size_t bufferSize) {
4938 const char* p = get_current_directory(buffer, bufferSize);
4939
4940 if (p == NULL) {
4941 assert(p != NULL, "failed to get current directory");
4942 return 0;
4943 }
4944
4945 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4946 p, current_process_id());
4947
4948 return strlen(buffer);
4949 }
4950
4951 #ifndef PRODUCT
4952 void TestReserveMemorySpecial_test() {
4953 // No tests available for this platform
4954 }
4955 #endif