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