Mercurial > hg > graal-jvmci-8
comparison src/os/aix/vm/os_aix.cpp @ 14415:666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
Reviewed-by: kvn
author | simonis |
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date | Fri, 06 Sep 2013 20:16:09 +0200 |
parents | |
children | 3068270ba476 |
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1 /* | |
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. | |
3 * Copyright 2012, 2013 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_share_aix.hpp" | |
46 #include "porting_aix.hpp" | |
47 #include "prims/jniFastGetField.hpp" | |
48 #include "prims/jvm.h" | |
49 #include "prims/jvm_misc.hpp" | |
50 #include "runtime/arguments.hpp" | |
51 #include "runtime/extendedPC.hpp" | |
52 #include "runtime/globals.hpp" | |
53 #include "runtime/interfaceSupport.hpp" | |
54 #include "runtime/java.hpp" | |
55 #include "runtime/javaCalls.hpp" | |
56 #include "runtime/mutexLocker.hpp" | |
57 #include "runtime/objectMonitor.hpp" | |
58 #include "runtime/osThread.hpp" | |
59 #include "runtime/perfMemory.hpp" | |
60 #include "runtime/sharedRuntime.hpp" | |
61 #include "runtime/statSampler.hpp" | |
62 #include "runtime/stubRoutines.hpp" | |
63 #include "runtime/threadCritical.hpp" | |
64 #include "runtime/timer.hpp" | |
65 #include "services/attachListener.hpp" | |
66 #include "services/runtimeService.hpp" | |
67 #include "thread_aix.inline.hpp" | |
68 #include "utilities/decoder.hpp" | |
69 #include "utilities/defaultStream.hpp" | |
70 #include "utilities/events.hpp" | |
71 #include "utilities/growableArray.hpp" | |
72 #include "utilities/vmError.hpp" | |
73 #ifdef TARGET_ARCH_ppc | |
74 # include "assembler_ppc.inline.hpp" | |
75 # include "nativeInst_ppc.hpp" | |
76 #endif | |
77 #ifdef COMPILER1 | |
78 #include "c1/c1_Runtime1.hpp" | |
79 #endif | |
80 #ifdef COMPILER2 | |
81 #include "opto/runtime.hpp" | |
82 #endif | |
83 | |
84 // put OS-includes here (sorted alphabetically) | |
85 #include <errno.h> | |
86 #include <fcntl.h> | |
87 #include <inttypes.h> | |
88 #include <poll.h> | |
89 #include <procinfo.h> | |
90 #include <pthread.h> | |
91 #include <pwd.h> | |
92 #include <semaphore.h> | |
93 #include <signal.h> | |
94 #include <stdint.h> | |
95 #include <stdio.h> | |
96 #include <string.h> | |
97 #include <unistd.h> | |
98 #include <sys/ioctl.h> | |
99 #include <sys/ipc.h> | |
100 #include <sys/mman.h> | |
101 #include <sys/resource.h> | |
102 #include <sys/select.h> | |
103 #include <sys/shm.h> | |
104 #include <sys/socket.h> | |
105 #include <sys/stat.h> | |
106 #include <sys/sysinfo.h> | |
107 #include <sys/systemcfg.h> | |
108 #include <sys/time.h> | |
109 #include <sys/times.h> | |
110 #include <sys/types.h> | |
111 #include <sys/utsname.h> | |
112 #include <sys/vminfo.h> | |
113 #include <sys/wait.h> | |
114 | |
115 // Add missing declarations (should be in procinfo.h but isn't until AIX 6.1). | |
116 #if !defined(_AIXVERSION_610) | |
117 extern "C" { | |
118 int getthrds64(pid_t ProcessIdentifier, | |
119 struct thrdentry64* ThreadBuffer, | |
120 int ThreadSize, | |
121 tid64_t* IndexPointer, | |
122 int Count); | |
123 } | |
124 #endif | |
125 | |
126 // Excerpts from systemcfg.h definitions newer than AIX 5.3 | |
127 #ifndef PV_7 | |
128 # define PV_7 0x200000 // Power PC 7 | |
129 # define PV_7_Compat 0x208000 // Power PC 7 | |
130 #endif | |
131 | |
132 #define MAX_PATH (2 * K) | |
133 | |
134 // for timer info max values which include all bits | |
135 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
136 // for multipage initialization error analysis (in 'g_multipage_error') | |
137 #define ERROR_MP_OS_TOO_OLD 100 | |
138 #define ERROR_MP_EXTSHM_ACTIVE 101 | |
139 #define ERROR_MP_VMGETINFO_FAILED 102 | |
140 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103 | |
141 | |
142 // the semantics in this file are thus that codeptr_t is a *real code ptr* | |
143 // This means that any function taking codeptr_t as arguments will assume | |
144 // a real codeptr and won't handle function descriptors (eg getFuncName), | |
145 // whereas functions taking address as args will deal with function | |
146 // descriptors (eg os::dll_address_to_library_name) | |
147 typedef unsigned int* codeptr_t; | |
148 | |
149 // typedefs for stackslots, stack pointers, pointers to op codes | |
150 typedef unsigned long stackslot_t; | |
151 typedef stackslot_t* stackptr_t; | |
152 | |
153 // query dimensions of the stack of the calling thread | |
154 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size); | |
155 | |
156 // function to check a given stack pointer against given stack limits | |
157 inline bool is_valid_stackpointer(stackptr_t sp, stackptr_t stack_base, size_t stack_size) { | |
158 if (((uintptr_t)sp) & 0x7) { | |
159 return false; | |
160 } | |
161 if (sp > stack_base) { | |
162 return false; | |
163 } | |
164 if (sp < (stackptr_t) ((address)stack_base - stack_size)) { | |
165 return false; | |
166 } | |
167 return true; | |
168 } | |
169 | |
170 // returns true if function is a valid codepointer | |
171 inline bool is_valid_codepointer(codeptr_t p) { | |
172 if (!p) { | |
173 return false; | |
174 } | |
175 if (((uintptr_t)p) & 0x3) { | |
176 return false; | |
177 } | |
178 if (LoadedLibraries::find_for_text_address((address)p) == NULL) { | |
179 return false; | |
180 } | |
181 return true; | |
182 } | |
183 | |
184 // macro to check a given stack pointer against given stack limits and to die if test fails | |
185 #define CHECK_STACK_PTR(sp, stack_base, stack_size) { \ | |
186 guarantee(is_valid_stackpointer((stackptr_t)(sp), (stackptr_t)(stack_base), stack_size), "Stack Pointer Invalid"); \ | |
187 } | |
188 | |
189 // macro to check the current stack pointer against given stacklimits | |
190 #define CHECK_CURRENT_STACK_PTR(stack_base, stack_size) { \ | |
191 address sp; \ | |
192 sp = os::current_stack_pointer(); \ | |
193 CHECK_STACK_PTR(sp, stack_base, stack_size); \ | |
194 } | |
195 | |
196 //////////////////////////////////////////////////////////////////////////////// | |
197 // global variables (for a description see os_aix.hpp) | |
198 | |
199 julong os::Aix::_physical_memory = 0; | |
200 pthread_t os::Aix::_main_thread = ((pthread_t)0); | |
201 int os::Aix::_page_size = -1; | |
202 int os::Aix::_on_pase = -1; | |
203 int os::Aix::_os_version = -1; | |
204 int os::Aix::_stack_page_size = -1; | |
205 size_t os::Aix::_shm_default_page_size = -1; | |
206 int os::Aix::_can_use_64K_pages = -1; | |
207 int os::Aix::_can_use_16M_pages = -1; | |
208 int os::Aix::_xpg_sus_mode = -1; | |
209 int os::Aix::_extshm = -1; | |
210 int os::Aix::_logical_cpus = -1; | |
211 | |
212 //////////////////////////////////////////////////////////////////////////////// | |
213 // local variables | |
214 | |
215 static int g_multipage_error = -1; // error analysis for multipage initialization | |
216 static jlong initial_time_count = 0; | |
217 static int clock_tics_per_sec = 100; | |
218 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks) | |
219 static bool check_signals = true; | |
220 static pid_t _initial_pid = 0; | |
221 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769) | |
222 static sigset_t SR_sigset; | |
223 static pthread_mutex_t dl_mutex; // Used to protect dlsym() calls */ | |
224 | |
225 julong os::available_memory() { | |
226 return Aix::available_memory(); | |
227 } | |
228 | |
229 julong os::Aix::available_memory() { | |
230 Unimplemented(); | |
231 return 0; | |
232 } | |
233 | |
234 julong os::physical_memory() { | |
235 return Aix::physical_memory(); | |
236 } | |
237 | |
238 //////////////////////////////////////////////////////////////////////////////// | |
239 // environment support | |
240 | |
241 bool os::getenv(const char* name, char* buf, int len) { | |
242 const char* val = ::getenv(name); | |
243 if (val != NULL && strlen(val) < (size_t)len) { | |
244 strcpy(buf, val); | |
245 return true; | |
246 } | |
247 if (len > 0) buf[0] = 0; // return a null string | |
248 return false; | |
249 } | |
250 | |
251 | |
252 // Return true if user is running as root. | |
253 | |
254 bool os::have_special_privileges() { | |
255 static bool init = false; | |
256 static bool privileges = false; | |
257 if (!init) { | |
258 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
259 init = true; | |
260 } | |
261 return privileges; | |
262 } | |
263 | |
264 // Helper function, emulates disclaim64 using multiple 32bit disclaims | |
265 // because we cannot use disclaim64() on AS/400 and old AIX releases. | |
266 static bool my_disclaim64(char* addr, size_t size) { | |
267 | |
268 if (size == 0) { | |
269 return true; | |
270 } | |
271 | |
272 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.) | |
273 const unsigned int maxDisclaimSize = 0x80000000; | |
274 | |
275 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize); | |
276 const unsigned int lastDisclaimSize = (size % maxDisclaimSize); | |
277 | |
278 char* p = addr; | |
279 | |
280 for (int i = 0; i < numFullDisclaimsNeeded; i ++) { | |
281 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) { | |
282 //if (Verbose) | |
283 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno); | |
284 return false; | |
285 } | |
286 p += maxDisclaimSize; | |
287 } | |
288 | |
289 if (lastDisclaimSize > 0) { | |
290 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) { | |
291 //if (Verbose) | |
292 fprintf(stderr, "Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno); | |
293 return false; | |
294 } | |
295 } | |
296 | |
297 return true; | |
298 } | |
299 | |
300 // Cpu architecture string | |
301 #if defined(PPC32) | |
302 static char cpu_arch[] = "ppc"; | |
303 #elif defined(PPC64) | |
304 static char cpu_arch[] = "ppc64"; | |
305 #else | |
306 #error Add appropriate cpu_arch setting | |
307 #endif | |
308 | |
309 | |
310 // Given an address, returns the size of the page backing that address. | |
311 size_t os::Aix::query_pagesize(void* addr) { | |
312 | |
313 vm_page_info pi; | |
314 pi.addr = (uint64_t)addr; | |
315 if (::vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) { | |
316 return pi.pagesize; | |
317 } else { | |
318 fprintf(stderr, "vmgetinfo failed to retrieve page size for address %p (errno %d).\n", addr, errno); | |
319 assert(false, "vmgetinfo failed to retrieve page size"); | |
320 return SIZE_4K; | |
321 } | |
322 | |
323 } | |
324 | |
325 // Returns the kernel thread id of the currently running thread. | |
326 pid_t os::Aix::gettid() { | |
327 return (pid_t) thread_self(); | |
328 } | |
329 | |
330 void os::Aix::initialize_system_info() { | |
331 | |
332 // get the number of online(logical) cpus instead of configured | |
333 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN); | |
334 assert(_processor_count > 0, "_processor_count must be > 0"); | |
335 | |
336 // retrieve total physical storage | |
337 os::Aix::meminfo_t mi; | |
338 if (!os::Aix::get_meminfo(&mi)) { | |
339 fprintf(stderr, "os::Aix::get_meminfo failed.\n"); fflush(stderr); | |
340 assert(false, "os::Aix::get_meminfo failed."); | |
341 } | |
342 _physical_memory = (julong) mi.real_total; | |
343 } | |
344 | |
345 // Helper function for tracing page sizes. | |
346 static const char* describe_pagesize(size_t pagesize) { | |
347 switch (pagesize) { | |
348 case SIZE_4K : return "4K"; | |
349 case SIZE_64K: return "64K"; | |
350 case SIZE_16M: return "16M"; | |
351 case SIZE_16G: return "16G"; | |
352 default: | |
353 assert(false, "surprise"); | |
354 return "??"; | |
355 } | |
356 } | |
357 | |
358 // Retrieve information about multipage size support. Will initialize | |
359 // Aix::_page_size, Aix::_stack_page_size, Aix::_can_use_64K_pages, | |
360 // Aix::_can_use_16M_pages. | |
361 // Must be called before calling os::large_page_init(). | |
362 void os::Aix::query_multipage_support() { | |
363 | |
364 guarantee(_page_size == -1 && | |
365 _stack_page_size == -1 && | |
366 _can_use_64K_pages == -1 && | |
367 _can_use_16M_pages == -1 && | |
368 g_multipage_error == -1, | |
369 "do not call twice"); | |
370 | |
371 _page_size = ::sysconf(_SC_PAGESIZE); | |
372 | |
373 // This really would surprise me. | |
374 assert(_page_size == SIZE_4K, "surprise!"); | |
375 | |
376 | |
377 // query default data page size (default page size for C-Heap, pthread stacks and .bss). | |
378 // Default data page size is influenced either by linker options (-bdatapsize) | |
379 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given, | |
380 // default should be 4K. | |
381 size_t data_page_size = SIZE_4K; | |
382 { | |
383 void* p = ::malloc(SIZE_16M); | |
384 data_page_size = os::Aix::query_pagesize(p); | |
385 ::free(p); | |
386 } | |
387 | |
388 // query default shm page size (LDR_CNTRL SHMPSIZE) | |
389 { | |
390 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR); | |
391 guarantee(shmid != -1, "shmget failed"); | |
392 void* p = ::shmat(shmid, NULL, 0); | |
393 ::shmctl(shmid, IPC_RMID, NULL); | |
394 guarantee(p != (void*) -1, "shmat failed"); | |
395 _shm_default_page_size = os::Aix::query_pagesize(p); | |
396 ::shmdt(p); | |
397 } | |
398 | |
399 // before querying the stack page size, make sure we are not running as primordial | |
400 // thread (because primordial thread's stack may have different page size than | |
401 // pthread thread stacks). Running a VM on the primordial thread won't work for a | |
402 // number of reasons so we may just as well guarantee it here | |
403 guarantee(!os::Aix::is_primordial_thread(), "Must not be called for primordial thread"); | |
404 | |
405 // query stack page size | |
406 { | |
407 int dummy = 0; | |
408 _stack_page_size = os::Aix::query_pagesize(&dummy); | |
409 // everything else would surprise me and should be looked into | |
410 guarantee(_stack_page_size == SIZE_4K || _stack_page_size == SIZE_64K, "Wrong page size"); | |
411 // also, just for completeness: pthread stacks are allocated from C heap, so | |
412 // stack page size should be the same as data page size | |
413 guarantee(_stack_page_size == data_page_size, "stack page size should be the same as data page size"); | |
414 } | |
415 | |
416 // EXTSHM is bad: among other things, it prevents setting pagesize dynamically | |
417 // for system V shm. | |
418 if (Aix::extshm()) { | |
419 if (Verbose) { | |
420 fprintf(stderr, "EXTSHM is active - will disable large page support.\n" | |
421 "Please make sure EXTSHM is OFF for large page support.\n"); | |
422 } | |
423 g_multipage_error = ERROR_MP_EXTSHM_ACTIVE; | |
424 _can_use_64K_pages = _can_use_16M_pages = 0; | |
425 goto query_multipage_support_end; | |
426 } | |
427 | |
428 // now check which page sizes the OS claims it supports, and of those, which actually can be used. | |
429 { | |
430 const int MAX_PAGE_SIZES = 4; | |
431 psize_t sizes[MAX_PAGE_SIZES]; | |
432 const int num_psizes = ::vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES); | |
433 if (num_psizes == -1) { | |
434 if (Verbose) { | |
435 fprintf(stderr, "vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)\n", errno); | |
436 fprintf(stderr, "disabling multipage support.\n"); | |
437 } | |
438 g_multipage_error = ERROR_MP_VMGETINFO_FAILED; | |
439 _can_use_64K_pages = _can_use_16M_pages = 0; | |
440 goto query_multipage_support_end; | |
441 } | |
442 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed."); | |
443 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?"); | |
444 if (Verbose) { | |
445 fprintf(stderr, "vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes); | |
446 for (int i = 0; i < num_psizes; i ++) { | |
447 fprintf(stderr, " %s ", describe_pagesize(sizes[i])); | |
448 } | |
449 fprintf(stderr, " .\n"); | |
450 } | |
451 | |
452 // Can we use 64K, 16M pages? | |
453 _can_use_64K_pages = 0; | |
454 _can_use_16M_pages = 0; | |
455 for (int i = 0; i < num_psizes; i ++) { | |
456 if (sizes[i] == SIZE_64K) { | |
457 _can_use_64K_pages = 1; | |
458 } else if (sizes[i] == SIZE_16M) { | |
459 _can_use_16M_pages = 1; | |
460 } | |
461 } | |
462 | |
463 if (!_can_use_64K_pages) { | |
464 g_multipage_error = ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K; | |
465 } | |
466 | |
467 // Double-check for 16M pages: Even if AIX claims to be able to use 16M pages, | |
468 // there must be an actual 16M page pool, and we must run with enough rights. | |
469 if (_can_use_16M_pages) { | |
470 const int shmid = ::shmget(IPC_PRIVATE, SIZE_16M, IPC_CREAT | S_IRUSR | S_IWUSR); | |
471 guarantee(shmid != -1, "shmget failed"); | |
472 struct shmid_ds shm_buf = { 0 }; | |
473 shm_buf.shm_pagesize = SIZE_16M; | |
474 const bool can_set_pagesize = ::shmctl(shmid, SHM_PAGESIZE, &shm_buf) == 0 ? true : false; | |
475 const int en = errno; | |
476 ::shmctl(shmid, IPC_RMID, NULL); | |
477 if (!can_set_pagesize) { | |
478 if (Verbose) { | |
479 fprintf(stderr, "Failed to allocate even one misely 16M page. shmctl failed with %d (%s).\n" | |
480 "Will deactivate 16M support.\n", en, strerror(en)); | |
481 } | |
482 _can_use_16M_pages = 0; | |
483 } | |
484 } | |
485 | |
486 } // end: check which pages can be used for shared memory | |
487 | |
488 query_multipage_support_end: | |
489 | |
490 guarantee(_page_size != -1 && | |
491 _stack_page_size != -1 && | |
492 _can_use_64K_pages != -1 && | |
493 _can_use_16M_pages != -1, "Page sizes not properly initialized"); | |
494 | |
495 if (_can_use_64K_pages) { | |
496 g_multipage_error = 0; | |
497 } | |
498 | |
499 if (Verbose) { | |
500 fprintf(stderr, "Data page size (C-Heap, bss, etc): %s\n", describe_pagesize(data_page_size)); | |
501 fprintf(stderr, "Thread stack page size (pthread): %s\n", describe_pagesize(_stack_page_size)); | |
502 fprintf(stderr, "Default shared memory page size: %s\n", describe_pagesize(_shm_default_page_size)); | |
503 fprintf(stderr, "Can use 64K pages dynamically with shared meory: %s\n", (_can_use_64K_pages ? "yes" :"no")); | |
504 fprintf(stderr, "Can use 16M pages dynamically with shared memory: %s\n", (_can_use_16M_pages ? "yes" :"no")); | |
505 fprintf(stderr, "Multipage error details: %d\n", g_multipage_error); | |
506 } | |
507 | |
508 } // end os::Aix::query_multipage_support() | |
509 | |
510 | |
511 // The code for this method was initially derived from the version in os_linux.cpp | |
512 void os::init_system_properties_values() { | |
513 // The next few definitions allow the code to be verbatim: | |
514 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) | |
515 #define DEFAULT_LIBPATH "/usr/lib:/lib" | |
516 #define EXTENSIONS_DIR "/lib/ext" | |
517 #define ENDORSED_DIR "/lib/endorsed" | |
518 | |
519 // sysclasspath, java_home, dll_dir | |
520 char *home_path; | |
521 char *dll_path; | |
522 char *pslash; | |
523 char buf[MAXPATHLEN]; | |
524 os::jvm_path(buf, sizeof(buf)); | |
525 | |
526 // Found the full path to libjvm.so. | |
527 // Now cut the path to <java_home>/jre if we can. | |
528 *(strrchr(buf, '/')) = '\0'; // get rid of /libjvm.so | |
529 pslash = strrchr(buf, '/'); | |
530 if (pslash != NULL) { | |
531 *pslash = '\0'; // get rid of /{client|server|hotspot} | |
532 } | |
533 | |
534 dll_path = malloc(strlen(buf) + 1); | |
535 strcpy(dll_path, buf); | |
536 Arguments::set_dll_dir(dll_path); | |
537 | |
538 if (pslash != NULL) { | |
539 pslash = strrchr(buf, '/'); | |
540 if (pslash != NULL) { | |
541 *pslash = '\0'; // get rid of /<arch> | |
542 pslash = strrchr(buf, '/'); | |
543 if (pslash != NULL) { | |
544 *pslash = '\0'; // get rid of /lib | |
545 } | |
546 } | |
547 } | |
548 | |
549 home_path = malloc(strlen(buf) + 1); | |
550 strcpy(home_path, buf); | |
551 Arguments::set_java_home(home_path); | |
552 | |
553 if (!set_boot_path('/', ':')) return; | |
554 | |
555 // Where to look for native libraries | |
556 | |
557 // On Aix we get the user setting of LIBPATH | |
558 // Eventually, all the library path setting will be done here. | |
559 char *ld_library_path; | |
560 | |
561 // Construct the invariant part of ld_library_path. | |
562 ld_library_path = (char *) malloc(sizeof(DEFAULT_LIBPATH)); | |
563 sprintf(ld_library_path, DEFAULT_LIBPATH); | |
564 | |
565 // Get the user setting of LIBPATH, and prepended it. | |
566 char *v = ::getenv("LIBPATH"); | |
567 if (v == NULL) { | |
568 v = ""; | |
569 } | |
570 | |
571 char *t = ld_library_path; | |
572 // That's +1 for the colon and +1 for the trailing '\0' | |
573 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
574 sprintf(ld_library_path, "%s:%s", v, t); | |
575 | |
576 Arguments::set_library_path(ld_library_path); | |
577 | |
578 // Extensions directories | |
579 char* cbuf = malloc(strlen(Arguments::get_java_home()) + sizeof(EXTENSIONS_DIR)); | |
580 sprintf(cbuf, "%s" EXTENSIONS_DIR, Arguments::get_java_home()); | |
581 Arguments::set_ext_dirs(cbuf); | |
582 | |
583 // Endorsed standards default directory. | |
584 cbuf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
585 sprintf(cbuf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
586 Arguments::set_endorsed_dirs(cbuf); | |
587 | |
588 #undef malloc | |
589 #undef DEFAULT_LIBPATH | |
590 #undef EXTENSIONS_DIR | |
591 #undef ENDORSED_DIR | |
592 } | |
593 | |
594 //////////////////////////////////////////////////////////////////////////////// | |
595 // breakpoint support | |
596 | |
597 void os::breakpoint() { | |
598 BREAKPOINT; | |
599 } | |
600 | |
601 extern "C" void breakpoint() { | |
602 // use debugger to set breakpoint here | |
603 } | |
604 | |
605 //////////////////////////////////////////////////////////////////////////////// | |
606 // signal support | |
607 | |
608 debug_only(static bool signal_sets_initialized = false); | |
609 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
610 | |
611 bool os::Aix::is_sig_ignored(int sig) { | |
612 struct sigaction oact; | |
613 sigaction(sig, (struct sigaction*)NULL, &oact); | |
614 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
615 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
616 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
617 return true; | |
618 else | |
619 return false; | |
620 } | |
621 | |
622 void os::Aix::signal_sets_init() { | |
623 // Should also have an assertion stating we are still single-threaded. | |
624 assert(!signal_sets_initialized, "Already initialized"); | |
625 // Fill in signals that are necessarily unblocked for all threads in | |
626 // the VM. Currently, we unblock the following signals: | |
627 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
628 // by -Xrs (=ReduceSignalUsage)); | |
629 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
630 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
631 // the dispositions or masks wrt these signals. | |
632 // Programs embedding the VM that want to use the above signals for their | |
633 // own purposes must, at this time, use the "-Xrs" option to prevent | |
634 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
635 // (See bug 4345157, and other related bugs). | |
636 // In reality, though, unblocking these signals is really a nop, since | |
637 // these signals are not blocked by default. | |
638 sigemptyset(&unblocked_sigs); | |
639 sigemptyset(&allowdebug_blocked_sigs); | |
640 sigaddset(&unblocked_sigs, SIGILL); | |
641 sigaddset(&unblocked_sigs, SIGSEGV); | |
642 sigaddset(&unblocked_sigs, SIGBUS); | |
643 sigaddset(&unblocked_sigs, SIGFPE); | |
644 sigaddset(&unblocked_sigs, SIGTRAP); | |
645 sigaddset(&unblocked_sigs, SIGDANGER); | |
646 sigaddset(&unblocked_sigs, SR_signum); | |
647 | |
648 if (!ReduceSignalUsage) { | |
649 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
650 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
651 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
652 } | |
653 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
654 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
655 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
656 } | |
657 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
658 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
659 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
660 } | |
661 } | |
662 // Fill in signals that are blocked by all but the VM thread. | |
663 sigemptyset(&vm_sigs); | |
664 if (!ReduceSignalUsage) | |
665 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
666 debug_only(signal_sets_initialized = true); | |
667 } | |
668 | |
669 // These are signals that are unblocked while a thread is running Java. | |
670 // (For some reason, they get blocked by default.) | |
671 sigset_t* os::Aix::unblocked_signals() { | |
672 assert(signal_sets_initialized, "Not initialized"); | |
673 return &unblocked_sigs; | |
674 } | |
675 | |
676 // These are the signals that are blocked while a (non-VM) thread is | |
677 // running Java. Only the VM thread handles these signals. | |
678 sigset_t* os::Aix::vm_signals() { | |
679 assert(signal_sets_initialized, "Not initialized"); | |
680 return &vm_sigs; | |
681 } | |
682 | |
683 // These are signals that are blocked during cond_wait to allow debugger in | |
684 sigset_t* os::Aix::allowdebug_blocked_signals() { | |
685 assert(signal_sets_initialized, "Not initialized"); | |
686 return &allowdebug_blocked_sigs; | |
687 } | |
688 | |
689 void os::Aix::hotspot_sigmask(Thread* thread) { | |
690 | |
691 //Save caller's signal mask before setting VM signal mask | |
692 sigset_t caller_sigmask; | |
693 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
694 | |
695 OSThread* osthread = thread->osthread(); | |
696 osthread->set_caller_sigmask(caller_sigmask); | |
697 | |
698 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL); | |
699 | |
700 if (!ReduceSignalUsage) { | |
701 if (thread->is_VM_thread()) { | |
702 // Only the VM thread handles BREAK_SIGNAL ... | |
703 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
704 } else { | |
705 // ... all other threads block BREAK_SIGNAL | |
706 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
707 } | |
708 } | |
709 } | |
710 | |
711 // retrieve memory information. | |
712 // Returns false if something went wrong; | |
713 // content of pmi undefined in this case. | |
714 bool os::Aix::get_meminfo(meminfo_t* pmi) { | |
715 | |
716 assert(pmi, "get_meminfo: invalid parameter"); | |
717 | |
718 memset(pmi, 0, sizeof(meminfo_t)); | |
719 | |
720 if (os::Aix::on_pase()) { | |
721 | |
722 Unimplemented(); | |
723 return false; | |
724 | |
725 } else { | |
726 | |
727 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics | |
728 // See: | |
729 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp | |
730 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm | |
731 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp | |
732 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm | |
733 | |
734 perfstat_memory_total_t psmt; | |
735 memset (&psmt, '\0', sizeof(psmt)); | |
736 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1); | |
737 if (rc == -1) { | |
738 fprintf(stderr, "perfstat_memory_total() failed (errno=%d)\n", errno); | |
739 assert(0, "perfstat_memory_total() failed"); | |
740 return false; | |
741 } | |
742 | |
743 assert(rc == 1, "perfstat_memory_total() - weird return code"); | |
744 | |
745 // excerpt from | |
746 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp | |
747 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm | |
748 // The fields of perfstat_memory_total_t: | |
749 // u_longlong_t virt_total Total virtual memory (in 4 KB pages). | |
750 // u_longlong_t real_total Total real memory (in 4 KB pages). | |
751 // u_longlong_t real_free Free real memory (in 4 KB pages). | |
752 // u_longlong_t pgsp_total Total paging space (in 4 KB pages). | |
753 // u_longlong_t pgsp_free Free paging space (in 4 KB pages). | |
754 | |
755 pmi->virt_total = psmt.virt_total * 4096; | |
756 pmi->real_total = psmt.real_total * 4096; | |
757 pmi->real_free = psmt.real_free * 4096; | |
758 pmi->pgsp_total = psmt.pgsp_total * 4096; | |
759 pmi->pgsp_free = psmt.pgsp_free * 4096; | |
760 | |
761 return true; | |
762 | |
763 } | |
764 } // end os::Aix::get_meminfo | |
765 | |
766 // Retrieve global cpu information. | |
767 // Returns false if something went wrong; | |
768 // the content of pci is undefined in this case. | |
769 bool os::Aix::get_cpuinfo(cpuinfo_t* pci) { | |
770 assert(pci, "get_cpuinfo: invalid parameter"); | |
771 memset(pci, 0, sizeof(cpuinfo_t)); | |
772 | |
773 perfstat_cpu_total_t psct; | |
774 memset (&psct, '\0', sizeof(psct)); | |
775 | |
776 if (-1 == libperfstat::perfstat_cpu_total(NULL, &psct, sizeof(perfstat_cpu_total_t), 1)) { | |
777 fprintf(stderr, "perfstat_cpu_total() failed (errno=%d)\n", errno); | |
778 assert(0, "perfstat_cpu_total() failed"); | |
779 return false; | |
780 } | |
781 | |
782 // global cpu information | |
783 strcpy (pci->description, psct.description); | |
784 pci->processorHZ = psct.processorHZ; | |
785 pci->ncpus = psct.ncpus; | |
786 os::Aix::_logical_cpus = psct.ncpus; | |
787 for (int i = 0; i < 3; i++) { | |
788 pci->loadavg[i] = (double) psct.loadavg[i] / (1 << SBITS); | |
789 } | |
790 | |
791 // get the processor version from _system_configuration | |
792 switch (_system_configuration.version) { | |
793 case PV_7: | |
794 strcpy(pci->version, "Power PC 7"); | |
795 break; | |
796 case PV_6_1: | |
797 strcpy(pci->version, "Power PC 6 DD1.x"); | |
798 break; | |
799 case PV_6: | |
800 strcpy(pci->version, "Power PC 6"); | |
801 break; | |
802 case PV_5: | |
803 strcpy(pci->version, "Power PC 5"); | |
804 break; | |
805 case PV_5_2: | |
806 strcpy(pci->version, "Power PC 5_2"); | |
807 break; | |
808 case PV_5_3: | |
809 strcpy(pci->version, "Power PC 5_3"); | |
810 break; | |
811 case PV_5_Compat: | |
812 strcpy(pci->version, "PV_5_Compat"); | |
813 break; | |
814 case PV_6_Compat: | |
815 strcpy(pci->version, "PV_6_Compat"); | |
816 break; | |
817 case PV_7_Compat: | |
818 strcpy(pci->version, "PV_7_Compat"); | |
819 break; | |
820 default: | |
821 strcpy(pci->version, "unknown"); | |
822 } | |
823 | |
824 return true; | |
825 | |
826 } //end os::Aix::get_cpuinfo | |
827 | |
828 ////////////////////////////////////////////////////////////////////////////// | |
829 // detecting pthread library | |
830 | |
831 void os::Aix::libpthread_init() { | |
832 return; | |
833 } | |
834 | |
835 ////////////////////////////////////////////////////////////////////////////// | |
836 // create new thread | |
837 | |
838 // Thread start routine for all newly created threads | |
839 static void *java_start(Thread *thread) { | |
840 | |
841 // find out my own stack dimensions | |
842 { | |
843 // actually, this should do exactly the same as thread->record_stack_base_and_size... | |
844 address base = 0; | |
845 size_t size = 0; | |
846 query_stack_dimensions(&base, &size); | |
847 thread->set_stack_base(base); | |
848 thread->set_stack_size(size); | |
849 } | |
850 | |
851 // Do some sanity checks. | |
852 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size()); | |
853 | |
854 // Try to randomize the cache line index of hot stack frames. | |
855 // This helps when threads of the same stack traces evict each other's | |
856 // cache lines. The threads can be either from the same JVM instance, or | |
857 // from different JVM instances. The benefit is especially true for | |
858 // processors with hyperthreading technology. | |
859 | |
860 static int counter = 0; | |
861 int pid = os::current_process_id(); | |
862 alloca(((pid ^ counter++) & 7) * 128); | |
863 | |
864 ThreadLocalStorage::set_thread(thread); | |
865 | |
866 OSThread* osthread = thread->osthread(); | |
867 | |
868 // thread_id is kernel thread id (similar to Solaris LWP id) | |
869 osthread->set_thread_id(os::Aix::gettid()); | |
870 | |
871 // initialize signal mask for this thread | |
872 os::Aix::hotspot_sigmask(thread); | |
873 | |
874 // initialize floating point control register | |
875 os::Aix::init_thread_fpu_state(); | |
876 | |
877 assert(osthread->get_state() == RUNNABLE, "invalid os thread state"); | |
878 | |
879 // call one more level start routine | |
880 thread->run(); | |
881 | |
882 return 0; | |
883 } | |
884 | |
885 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
886 | |
887 // We want the whole function to be synchronized. | |
888 ThreadCritical cs; | |
889 | |
890 assert(thread->osthread() == NULL, "caller responsible"); | |
891 | |
892 // Allocate the OSThread object | |
893 OSThread* osthread = new OSThread(NULL, NULL); | |
894 if (osthread == NULL) { | |
895 return false; | |
896 } | |
897 | |
898 // set the correct thread state | |
899 osthread->set_thread_type(thr_type); | |
900 | |
901 // Initial state is ALLOCATED but not INITIALIZED | |
902 osthread->set_state(ALLOCATED); | |
903 | |
904 thread->set_osthread(osthread); | |
905 | |
906 // init thread attributes | |
907 pthread_attr_t attr; | |
908 pthread_attr_init(&attr); | |
909 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???"); | |
910 | |
911 // Make sure we run in 1:1 kernel-user-thread mode. | |
912 if (os::Aix::on_aix()) { | |
913 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???"); | |
914 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???"); | |
915 } // end: aix | |
916 | |
917 // Start in suspended state, and in os::thread_start, wake the thread up. | |
918 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???"); | |
919 | |
920 // calculate stack size if it's not specified by caller | |
921 if (os::Aix::supports_variable_stack_size()) { | |
922 if (stack_size == 0) { | |
923 stack_size = os::Aix::default_stack_size(thr_type); | |
924 | |
925 switch (thr_type) { | |
926 case os::java_thread: | |
927 // Java threads use ThreadStackSize whose default value can be changed with the flag -Xss. | |
928 assert(JavaThread::stack_size_at_create() > 0, "this should be set"); | |
929 stack_size = JavaThread::stack_size_at_create(); | |
930 break; | |
931 case os::compiler_thread: | |
932 if (CompilerThreadStackSize > 0) { | |
933 stack_size = (size_t)(CompilerThreadStackSize * K); | |
934 break; | |
935 } // else fall through: | |
936 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
937 case os::vm_thread: | |
938 case os::pgc_thread: | |
939 case os::cgc_thread: | |
940 case os::watcher_thread: | |
941 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
942 break; | |
943 } | |
944 } | |
945 | |
946 stack_size = MAX2(stack_size, os::Aix::min_stack_allowed); | |
947 pthread_attr_setstacksize(&attr, stack_size); | |
948 } //else let thread_create() pick the default value (96 K on AIX) | |
949 | |
950 pthread_t tid; | |
951 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
952 | |
953 pthread_attr_destroy(&attr); | |
954 | |
955 if (ret != 0) { | |
956 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
957 perror("pthread_create()"); | |
958 } | |
959 // Need to clean up stuff we've allocated so far | |
960 thread->set_osthread(NULL); | |
961 delete osthread; | |
962 return false; | |
963 } | |
964 | |
965 // Store pthread info into the OSThread | |
966 osthread->set_pthread_id(tid); | |
967 | |
968 return true; | |
969 } | |
970 | |
971 ///////////////////////////////////////////////////////////////////////////// | |
972 // attach existing thread | |
973 | |
974 // bootstrap the main thread | |
975 bool os::create_main_thread(JavaThread* thread) { | |
976 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread"); | |
977 return create_attached_thread(thread); | |
978 } | |
979 | |
980 bool os::create_attached_thread(JavaThread* thread) { | |
981 #ifdef ASSERT | |
982 thread->verify_not_published(); | |
983 #endif | |
984 | |
985 // Allocate the OSThread object | |
986 OSThread* osthread = new OSThread(NULL, NULL); | |
987 | |
988 if (osthread == NULL) { | |
989 return false; | |
990 } | |
991 | |
992 // Store pthread info into the OSThread | |
993 osthread->set_thread_id(os::Aix::gettid()); | |
994 osthread->set_pthread_id(::pthread_self()); | |
995 | |
996 // initialize floating point control register | |
997 os::Aix::init_thread_fpu_state(); | |
998 | |
999 // some sanity checks | |
1000 CHECK_CURRENT_STACK_PTR(thread->stack_base(), thread->stack_size()); | |
1001 | |
1002 // Initial thread state is RUNNABLE | |
1003 osthread->set_state(RUNNABLE); | |
1004 | |
1005 thread->set_osthread(osthread); | |
1006 | |
1007 if (UseNUMA) { | |
1008 int lgrp_id = os::numa_get_group_id(); | |
1009 if (lgrp_id != -1) { | |
1010 thread->set_lgrp_id(lgrp_id); | |
1011 } | |
1012 } | |
1013 | |
1014 // initialize signal mask for this thread | |
1015 // and save the caller's signal mask | |
1016 os::Aix::hotspot_sigmask(thread); | |
1017 | |
1018 return true; | |
1019 } | |
1020 | |
1021 void os::pd_start_thread(Thread* thread) { | |
1022 int status = pthread_continue_np(thread->osthread()->pthread_id()); | |
1023 assert(status == 0, "thr_continue failed"); | |
1024 } | |
1025 | |
1026 // Free OS resources related to the OSThread | |
1027 void os::free_thread(OSThread* osthread) { | |
1028 assert(osthread != NULL, "osthread not set"); | |
1029 | |
1030 if (Thread::current()->osthread() == osthread) { | |
1031 // Restore caller's signal mask | |
1032 sigset_t sigmask = osthread->caller_sigmask(); | |
1033 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
1034 } | |
1035 | |
1036 delete osthread; | |
1037 } | |
1038 | |
1039 ////////////////////////////////////////////////////////////////////////////// | |
1040 // thread local storage | |
1041 | |
1042 int os::allocate_thread_local_storage() { | |
1043 pthread_key_t key; | |
1044 int rslt = pthread_key_create(&key, NULL); | |
1045 assert(rslt == 0, "cannot allocate thread local storage"); | |
1046 return (int)key; | |
1047 } | |
1048 | |
1049 // Note: This is currently not used by VM, as we don't destroy TLS key | |
1050 // on VM exit. | |
1051 void os::free_thread_local_storage(int index) { | |
1052 int rslt = pthread_key_delete((pthread_key_t)index); | |
1053 assert(rslt == 0, "invalid index"); | |
1054 } | |
1055 | |
1056 void os::thread_local_storage_at_put(int index, void* value) { | |
1057 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
1058 assert(rslt == 0, "pthread_setspecific failed"); | |
1059 } | |
1060 | |
1061 extern "C" Thread* get_thread() { | |
1062 return ThreadLocalStorage::thread(); | |
1063 } | |
1064 | |
1065 //////////////////////////////////////////////////////////////////////////////// | |
1066 // time support | |
1067 | |
1068 // Time since start-up in seconds to a fine granularity. | |
1069 // Used by VMSelfDestructTimer and the MemProfiler. | |
1070 double os::elapsedTime() { | |
1071 return (double)(os::elapsed_counter()) * 0.000001; | |
1072 } | |
1073 | |
1074 jlong os::elapsed_counter() { | |
1075 timeval time; | |
1076 int status = gettimeofday(&time, NULL); | |
1077 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
1078 } | |
1079 | |
1080 jlong os::elapsed_frequency() { | |
1081 return (1000 * 1000); | |
1082 } | |
1083 | |
1084 // For now, we say that linux does not support vtime. I have no idea | |
1085 // whether it can actually be made to (DLD, 9/13/05). | |
1086 | |
1087 bool os::supports_vtime() { return false; } | |
1088 bool os::enable_vtime() { return false; } | |
1089 bool os::vtime_enabled() { return false; } | |
1090 double os::elapsedVTime() { | |
1091 // better than nothing, but not much | |
1092 return elapsedTime(); | |
1093 } | |
1094 | |
1095 jlong os::javaTimeMillis() { | |
1096 timeval time; | |
1097 int status = gettimeofday(&time, NULL); | |
1098 assert(status != -1, "aix error at gettimeofday()"); | |
1099 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
1100 } | |
1101 | |
1102 // We need to manually declare mread_real_time, | |
1103 // because IBM didn't provide a prototype in time.h. | |
1104 // (they probably only ever tested in C, not C++) | |
1105 extern "C" | |
1106 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t); | |
1107 | |
1108 jlong os::javaTimeNanos() { | |
1109 if (os::Aix::on_pase()) { | |
1110 Unimplemented(); | |
1111 return 0; | |
1112 } | |
1113 else { | |
1114 // On AIX use the precision of processors real time clock | |
1115 // or time base registers. | |
1116 timebasestruct_t time; | |
1117 int rc; | |
1118 | |
1119 // If the CPU has a time register, it will be used and | |
1120 // we have to convert to real time first. After convertion we have following data: | |
1121 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970] | |
1122 // time.tb_low [nanoseconds after the last full second above] | |
1123 // We better use mread_real_time here instead of read_real_time | |
1124 // to ensure that we will get a monotonic increasing time. | |
1125 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) { | |
1126 rc = time_base_to_time(&time, TIMEBASE_SZ); | |
1127 assert(rc != -1, "aix error at time_base_to_time()"); | |
1128 } | |
1129 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low); | |
1130 } | |
1131 } | |
1132 | |
1133 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
1134 { | |
1135 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1136 info_ptr->max_value = ALL_64_BITS; | |
1137 | |
1138 // gettimeofday is a real time clock so it skips | |
1139 info_ptr->may_skip_backward = true; | |
1140 info_ptr->may_skip_forward = true; | |
1141 } | |
1142 | |
1143 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1144 } | |
1145 | |
1146 // Return the real, user, and system times in seconds from an | |
1147 // arbitrary fixed point in the past. | |
1148 bool os::getTimesSecs(double* process_real_time, | |
1149 double* process_user_time, | |
1150 double* process_system_time) { | |
1151 Unimplemented(); | |
1152 return false; | |
1153 } | |
1154 | |
1155 | |
1156 char * os::local_time_string(char *buf, size_t buflen) { | |
1157 struct tm t; | |
1158 time_t long_time; | |
1159 time(&long_time); | |
1160 localtime_r(&long_time, &t); | |
1161 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1162 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1163 t.tm_hour, t.tm_min, t.tm_sec); | |
1164 return buf; | |
1165 } | |
1166 | |
1167 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
1168 return localtime_r(clock, res); | |
1169 } | |
1170 | |
1171 //////////////////////////////////////////////////////////////////////////////// | |
1172 // runtime exit support | |
1173 | |
1174 // Note: os::shutdown() might be called very early during initialization, or | |
1175 // called from signal handler. Before adding something to os::shutdown(), make | |
1176 // sure it is async-safe and can handle partially initialized VM. | |
1177 void os::shutdown() { | |
1178 | |
1179 // allow PerfMemory to attempt cleanup of any persistent resources | |
1180 perfMemory_exit(); | |
1181 | |
1182 // needs to remove object in file system | |
1183 AttachListener::abort(); | |
1184 | |
1185 // flush buffered output, finish log files | |
1186 ostream_abort(); | |
1187 | |
1188 // Check for abort hook | |
1189 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1190 if (abort_hook != NULL) { | |
1191 abort_hook(); | |
1192 } | |
1193 | |
1194 } | |
1195 | |
1196 // Note: os::abort() might be called very early during initialization, or | |
1197 // called from signal handler. Before adding something to os::abort(), make | |
1198 // sure it is async-safe and can handle partially initialized VM. | |
1199 void os::abort(bool dump_core) { | |
1200 os::shutdown(); | |
1201 if (dump_core) { | |
1202 #ifndef PRODUCT | |
1203 fdStream out(defaultStream::output_fd()); | |
1204 out.print_raw("Current thread is "); | |
1205 char buf[16]; | |
1206 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1207 out.print_raw_cr(buf); | |
1208 out.print_raw_cr("Dumping core ..."); | |
1209 #endif | |
1210 ::abort(); // dump core | |
1211 } | |
1212 | |
1213 ::exit(1); | |
1214 } | |
1215 | |
1216 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1217 void os::die() { | |
1218 ::abort(); | |
1219 } | |
1220 | |
1221 // Unused on Aix for now. | |
1222 void os::set_error_file(const char *logfile) {} | |
1223 | |
1224 | |
1225 // This method is a copy of JDK's sysGetLastErrorString | |
1226 // from src/solaris/hpi/src/system_md.c | |
1227 | |
1228 size_t os::lasterror(char *buf, size_t len) { | |
1229 | |
1230 if (errno == 0) return 0; | |
1231 | |
1232 const char *s = ::strerror(errno); | |
1233 size_t n = ::strlen(s); | |
1234 if (n >= len) { | |
1235 n = len - 1; | |
1236 } | |
1237 ::strncpy(buf, s, n); | |
1238 buf[n] = '\0'; | |
1239 return n; | |
1240 } | |
1241 | |
1242 intx os::current_thread_id() { return (intx)pthread_self(); } | |
1243 int os::current_process_id() { | |
1244 | |
1245 // This implementation returns a unique pid, the pid of the | |
1246 // launcher thread that starts the vm 'process'. | |
1247 | |
1248 // Under POSIX, getpid() returns the same pid as the | |
1249 // launcher thread rather than a unique pid per thread. | |
1250 // Use gettid() if you want the old pre NPTL behaviour. | |
1251 | |
1252 // if you are looking for the result of a call to getpid() that | |
1253 // returns a unique pid for the calling thread, then look at the | |
1254 // OSThread::thread_id() method in osThread_linux.hpp file | |
1255 | |
1256 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1257 } | |
1258 | |
1259 // DLL functions | |
1260 | |
1261 const char* os::dll_file_extension() { return ".so"; } | |
1262 | |
1263 // This must be hard coded because it's the system's temporary | |
1264 // directory not the java application's temp directory, ala java.io.tmpdir. | |
1265 const char* os::get_temp_directory() { return "/tmp"; } | |
1266 | |
1267 static bool file_exists(const char* filename) { | |
1268 struct stat statbuf; | |
1269 if (filename == NULL || strlen(filename) == 0) { | |
1270 return false; | |
1271 } | |
1272 return os::stat(filename, &statbuf) == 0; | |
1273 } | |
1274 | |
1275 bool os::dll_build_name(char* buffer, size_t buflen, | |
1276 const char* pname, const char* fname) { | |
1277 bool retval = false; | |
1278 // Copied from libhpi | |
1279 const size_t pnamelen = pname ? strlen(pname) : 0; | |
1280 | |
1281 // Return error on buffer overflow. | |
1282 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { | |
1283 *buffer = '\0'; | |
1284 return retval; | |
1285 } | |
1286 | |
1287 if (pnamelen == 0) { | |
1288 snprintf(buffer, buflen, "lib%s.so", fname); | |
1289 retval = true; | |
1290 } else if (strchr(pname, *os::path_separator()) != NULL) { | |
1291 int n; | |
1292 char** pelements = split_path(pname, &n); | |
1293 for (int i = 0; i < n; i++) { | |
1294 // Really shouldn't be NULL, but check can't hurt | |
1295 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1296 continue; // skip the empty path values | |
1297 } | |
1298 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); | |
1299 if (file_exists(buffer)) { | |
1300 retval = true; | |
1301 break; | |
1302 } | |
1303 } | |
1304 // release the storage | |
1305 for (int i = 0; i < n; i++) { | |
1306 if (pelements[i] != NULL) { | |
1307 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); | |
1308 } | |
1309 } | |
1310 if (pelements != NULL) { | |
1311 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); | |
1312 } | |
1313 } else { | |
1314 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); | |
1315 retval = true; | |
1316 } | |
1317 return retval; | |
1318 } | |
1319 | |
1320 // Check if addr is inside libjvm.so. | |
1321 bool os::address_is_in_vm(address addr) { | |
1322 | |
1323 // Input could be a real pc or a function pointer literal. The latter | |
1324 // would be a function descriptor residing in the data segment of a module. | |
1325 | |
1326 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(addr); | |
1327 if (lib) { | |
1328 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) { | |
1329 return true; | |
1330 } else { | |
1331 return false; | |
1332 } | |
1333 } else { | |
1334 lib = LoadedLibraries::find_for_data_address(addr); | |
1335 if (lib) { | |
1336 if (strcmp(lib->get_shortname(), "libjvm.so") == 0) { | |
1337 return true; | |
1338 } else { | |
1339 return false; | |
1340 } | |
1341 } else { | |
1342 return false; | |
1343 } | |
1344 } | |
1345 } | |
1346 | |
1347 // Resolve an AIX function descriptor literal to a code pointer. | |
1348 // If the input is a valid code pointer to a text segment of a loaded module, | |
1349 // it is returned unchanged. | |
1350 // If the input is a valid AIX function descriptor, it is resolved to the | |
1351 // code entry point. | |
1352 // If the input is neither a valid function descriptor nor a valid code pointer, | |
1353 // NULL is returned. | |
1354 static address resolve_function_descriptor_to_code_pointer(address p) { | |
1355 | |
1356 const LoadedLibraryModule* lib = LoadedLibraries::find_for_text_address(p); | |
1357 if (lib) { | |
1358 // its a real code pointer | |
1359 return p; | |
1360 } else { | |
1361 lib = LoadedLibraries::find_for_data_address(p); | |
1362 if (lib) { | |
1363 // pointer to data segment, potential function descriptor | |
1364 address code_entry = (address)(((FunctionDescriptor*)p)->entry()); | |
1365 if (LoadedLibraries::find_for_text_address(code_entry)) { | |
1366 // Its a function descriptor | |
1367 return code_entry; | |
1368 } | |
1369 } | |
1370 } | |
1371 return NULL; | |
1372 } | |
1373 | |
1374 bool os::dll_address_to_function_name(address addr, char *buf, | |
1375 int buflen, int *offset) { | |
1376 if (offset) { | |
1377 *offset = -1; | |
1378 } | |
1379 if (buf) { | |
1380 buf[0] = '\0'; | |
1381 } | |
1382 | |
1383 // Resolve function ptr literals first. | |
1384 addr = resolve_function_descriptor_to_code_pointer(addr); | |
1385 if (!addr) { | |
1386 return false; | |
1387 } | |
1388 | |
1389 // Go through Decoder::decode to call getFuncName which reads the name from the traceback table. | |
1390 return Decoder::decode(addr, buf, buflen, offset); | |
1391 } | |
1392 | |
1393 static int getModuleName(codeptr_t pc, // [in] program counter | |
1394 char* p_name, size_t namelen, // [out] optional: function name | |
1395 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages | |
1396 ) { | |
1397 | |
1398 // initialize output parameters | |
1399 if (p_name && namelen > 0) { | |
1400 *p_name = '\0'; | |
1401 } | |
1402 if (p_errmsg && errmsglen > 0) { | |
1403 *p_errmsg = '\0'; | |
1404 } | |
1405 | |
1406 const LoadedLibraryModule* const lib = LoadedLibraries::find_for_text_address((address)pc); | |
1407 if (lib) { | |
1408 if (p_name && namelen > 0) { | |
1409 sprintf(p_name, "%.*s", namelen, lib->get_shortname()); | |
1410 } | |
1411 return 0; | |
1412 } | |
1413 | |
1414 if (Verbose) { | |
1415 fprintf(stderr, "pc outside any module"); | |
1416 } | |
1417 | |
1418 return -1; | |
1419 | |
1420 } | |
1421 | |
1422 bool os::dll_address_to_library_name(address addr, char* buf, | |
1423 int buflen, int* offset) { | |
1424 if (offset) { | |
1425 *offset = -1; | |
1426 } | |
1427 if (buf) { | |
1428 buf[0] = '\0'; | |
1429 } | |
1430 | |
1431 // Resolve function ptr literals first. | |
1432 addr = resolve_function_descriptor_to_code_pointer(addr); | |
1433 if (!addr) { | |
1434 return false; | |
1435 } | |
1436 | |
1437 if (::getModuleName((codeptr_t) addr, buf, buflen, 0, 0) == 0) { | |
1438 return true; | |
1439 } | |
1440 return false; | |
1441 } | |
1442 | |
1443 // Loads .dll/.so and in case of error it checks if .dll/.so was built | |
1444 // for the same architecture as Hotspot is running on | |
1445 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
1446 | |
1447 if (ebuf && ebuflen > 0) { | |
1448 ebuf[0] = '\0'; | |
1449 ebuf[ebuflen - 1] = '\0'; | |
1450 } | |
1451 | |
1452 if (!filename || strlen(filename) == 0) { | |
1453 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); | |
1454 return NULL; | |
1455 } | |
1456 | |
1457 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants. | |
1458 void * result= ::dlopen(filename, RTLD_LAZY); | |
1459 if (result != NULL) { | |
1460 // Reload dll cache. Don't do this in signal handling. | |
1461 LoadedLibraries::reload(); | |
1462 return result; | |
1463 } else { | |
1464 // error analysis when dlopen fails | |
1465 const char* const error_report = ::dlerror(); | |
1466 if (error_report && ebuf && ebuflen > 0) { | |
1467 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", | |
1468 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); | |
1469 } | |
1470 } | |
1471 return NULL; | |
1472 } | |
1473 | |
1474 // Glibc-2.0 libdl is not MT safe. If you are building with any glibc, | |
1475 // chances are you might want to run the generated bits against glibc-2.0 | |
1476 // libdl.so, so always use locking for any version of glibc. | |
1477 void* os::dll_lookup(void* handle, const char* name) { | |
1478 pthread_mutex_lock(&dl_mutex); | |
1479 void* res = dlsym(handle, name); | |
1480 pthread_mutex_unlock(&dl_mutex); | |
1481 return res; | |
1482 } | |
1483 | |
1484 void os::print_dll_info(outputStream *st) { | |
1485 st->print_cr("Dynamic libraries:"); | |
1486 LoadedLibraries::print(st); | |
1487 } | |
1488 | |
1489 void os::print_os_info(outputStream* st) { | |
1490 st->print("OS:"); | |
1491 | |
1492 st->print("uname:"); | |
1493 struct utsname name; | |
1494 uname(&name); | |
1495 st->print(name.sysname); st->print(" "); | |
1496 st->print(name.nodename); st->print(" "); | |
1497 st->print(name.release); st->print(" "); | |
1498 st->print(name.version); st->print(" "); | |
1499 st->print(name.machine); | |
1500 st->cr(); | |
1501 | |
1502 // rlimit | |
1503 st->print("rlimit:"); | |
1504 struct rlimit rlim; | |
1505 | |
1506 st->print(" STACK "); | |
1507 getrlimit(RLIMIT_STACK, &rlim); | |
1508 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
1509 else st->print("%uk", rlim.rlim_cur >> 10); | |
1510 | |
1511 st->print(", CORE "); | |
1512 getrlimit(RLIMIT_CORE, &rlim); | |
1513 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
1514 else st->print("%uk", rlim.rlim_cur >> 10); | |
1515 | |
1516 st->print(", NPROC "); | |
1517 st->print("%d", sysconf(_SC_CHILD_MAX)); | |
1518 | |
1519 st->print(", NOFILE "); | |
1520 getrlimit(RLIMIT_NOFILE, &rlim); | |
1521 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
1522 else st->print("%d", rlim.rlim_cur); | |
1523 | |
1524 st->print(", AS "); | |
1525 getrlimit(RLIMIT_AS, &rlim); | |
1526 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
1527 else st->print("%uk", rlim.rlim_cur >> 10); | |
1528 | |
1529 // Print limits on DATA, because it limits the C-heap. | |
1530 st->print(", DATA "); | |
1531 getrlimit(RLIMIT_DATA, &rlim); | |
1532 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); | |
1533 else st->print("%uk", rlim.rlim_cur >> 10); | |
1534 st->cr(); | |
1535 | |
1536 // load average | |
1537 st->print("load average:"); | |
1538 double loadavg[3] = {-1.L, -1.L, -1.L}; | |
1539 os::loadavg(loadavg, 3); | |
1540 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); | |
1541 st->cr(); | |
1542 } | |
1543 | |
1544 void os::print_memory_info(outputStream* st) { | |
1545 | |
1546 st->print_cr("Memory:"); | |
1547 | |
1548 st->print_cr(" default page size: %s", describe_pagesize(os::vm_page_size())); | |
1549 st->print_cr(" default stack page size: %s", describe_pagesize(os::vm_page_size())); | |
1550 st->print_cr(" default shm page size: %s", describe_pagesize(os::Aix::shm_default_page_size())); | |
1551 st->print_cr(" can use 64K pages dynamically: %s", (os::Aix::can_use_64K_pages() ? "yes" :"no")); | |
1552 st->print_cr(" can use 16M pages dynamically: %s", (os::Aix::can_use_16M_pages() ? "yes" :"no")); | |
1553 if (g_multipage_error != 0) { | |
1554 st->print_cr(" multipage error: %d", g_multipage_error); | |
1555 } | |
1556 | |
1557 // print out LDR_CNTRL because it affects the default page sizes | |
1558 const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); | |
1559 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>"); | |
1560 | |
1561 const char* const extshm = ::getenv("EXTSHM"); | |
1562 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>"); | |
1563 | |
1564 // Call os::Aix::get_meminfo() to retrieve memory statistics. | |
1565 os::Aix::meminfo_t mi; | |
1566 if (os::Aix::get_meminfo(&mi)) { | |
1567 char buffer[256]; | |
1568 if (os::Aix::on_aix()) { | |
1569 jio_snprintf(buffer, sizeof(buffer), | |
1570 " physical total : %llu\n" | |
1571 " physical free : %llu\n" | |
1572 " swap total : %llu\n" | |
1573 " swap free : %llu\n", | |
1574 mi.real_total, | |
1575 mi.real_free, | |
1576 mi.pgsp_total, | |
1577 mi.pgsp_free); | |
1578 } else { | |
1579 Unimplemented(); | |
1580 } | |
1581 st->print_raw(buffer); | |
1582 } else { | |
1583 st->print_cr(" (no more information available)"); | |
1584 } | |
1585 } | |
1586 | |
1587 void os::pd_print_cpu_info(outputStream* st) { | |
1588 // cpu | |
1589 st->print("CPU:"); | |
1590 st->print("total %d", os::processor_count()); | |
1591 // It's not safe to query number of active processors after crash | |
1592 // st->print("(active %d)", os::active_processor_count()); | |
1593 st->print(" %s", VM_Version::cpu_features()); | |
1594 st->cr(); | |
1595 } | |
1596 | |
1597 void os::print_siginfo(outputStream* st, void* siginfo) { | |
1598 // Use common posix version. | |
1599 os::Posix::print_siginfo_brief(st, (const siginfo_t*) siginfo); | |
1600 st->cr(); | |
1601 } | |
1602 | |
1603 | |
1604 static void print_signal_handler(outputStream* st, int sig, | |
1605 char* buf, size_t buflen); | |
1606 | |
1607 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
1608 st->print_cr("Signal Handlers:"); | |
1609 print_signal_handler(st, SIGSEGV, buf, buflen); | |
1610 print_signal_handler(st, SIGBUS , buf, buflen); | |
1611 print_signal_handler(st, SIGFPE , buf, buflen); | |
1612 print_signal_handler(st, SIGPIPE, buf, buflen); | |
1613 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
1614 print_signal_handler(st, SIGILL , buf, buflen); | |
1615 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
1616 print_signal_handler(st, SR_signum, buf, buflen); | |
1617 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
1618 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
1619 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
1620 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
1621 print_signal_handler(st, SIGTRAP, buf, buflen); | |
1622 print_signal_handler(st, SIGDANGER, buf, buflen); | |
1623 } | |
1624 | |
1625 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
1626 | |
1627 // Find the full path to the current module, libjvm.so or libjvm_g.so | |
1628 void os::jvm_path(char *buf, jint buflen) { | |
1629 // Error checking. | |
1630 if (buflen < MAXPATHLEN) { | |
1631 assert(false, "must use a large-enough buffer"); | |
1632 buf[0] = '\0'; | |
1633 return; | |
1634 } | |
1635 // Lazy resolve the path to current module. | |
1636 if (saved_jvm_path[0] != 0) { | |
1637 strcpy(buf, saved_jvm_path); | |
1638 return; | |
1639 } | |
1640 | |
1641 Dl_info dlinfo; | |
1642 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); | |
1643 assert(ret != 0, "cannot locate libjvm"); | |
1644 char* rp = realpath((char *)dlinfo.dli_fname, buf); | |
1645 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?"); | |
1646 | |
1647 strcpy(saved_jvm_path, buf); | |
1648 } | |
1649 | |
1650 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
1651 // no prefix required, not even "_" | |
1652 } | |
1653 | |
1654 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
1655 // no suffix required | |
1656 } | |
1657 | |
1658 //////////////////////////////////////////////////////////////////////////////// | |
1659 // sun.misc.Signal support | |
1660 | |
1661 static volatile jint sigint_count = 0; | |
1662 | |
1663 static void | |
1664 UserHandler(int sig, void *siginfo, void *context) { | |
1665 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
1666 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
1667 // don't want to flood the manager thread with sem_post requests. | |
1668 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
1669 return; | |
1670 | |
1671 // Ctrl-C is pressed during error reporting, likely because the error | |
1672 // handler fails to abort. Let VM die immediately. | |
1673 if (sig == SIGINT && is_error_reported()) { | |
1674 os::die(); | |
1675 } | |
1676 | |
1677 os::signal_notify(sig); | |
1678 } | |
1679 | |
1680 void* os::user_handler() { | |
1681 return CAST_FROM_FN_PTR(void*, UserHandler); | |
1682 } | |
1683 | |
1684 extern "C" { | |
1685 typedef void (*sa_handler_t)(int); | |
1686 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
1687 } | |
1688 | |
1689 void* os::signal(int signal_number, void* handler) { | |
1690 struct sigaction sigAct, oldSigAct; | |
1691 | |
1692 sigfillset(&(sigAct.sa_mask)); | |
1693 | |
1694 // Do not block out synchronous signals in the signal handler. | |
1695 // Blocking synchronous signals only makes sense if you can really | |
1696 // be sure that those signals won't happen during signal handling, | |
1697 // when the blocking applies. Normal signal handlers are lean and | |
1698 // do not cause signals. But our signal handlers tend to be "risky" | |
1699 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen. | |
1700 // On AIX, PASE there was a case where a SIGSEGV happened, followed | |
1701 // by a SIGILL, which was blocked due to the signal mask. The process | |
1702 // just hung forever. Better to crash from a secondary signal than to hang. | |
1703 sigdelset(&(sigAct.sa_mask), SIGSEGV); | |
1704 sigdelset(&(sigAct.sa_mask), SIGBUS); | |
1705 sigdelset(&(sigAct.sa_mask), SIGILL); | |
1706 sigdelset(&(sigAct.sa_mask), SIGFPE); | |
1707 sigdelset(&(sigAct.sa_mask), SIGTRAP); | |
1708 | |
1709 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
1710 | |
1711 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
1712 | |
1713 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
1714 // -1 means registration failed | |
1715 return (void *)-1; | |
1716 } | |
1717 | |
1718 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
1719 } | |
1720 | |
1721 void os::signal_raise(int signal_number) { | |
1722 ::raise(signal_number); | |
1723 } | |
1724 | |
1725 // | |
1726 // The following code is moved from os.cpp for making this | |
1727 // code platform specific, which it is by its very nature. | |
1728 // | |
1729 | |
1730 // Will be modified when max signal is changed to be dynamic | |
1731 int os::sigexitnum_pd() { | |
1732 return NSIG; | |
1733 } | |
1734 | |
1735 // a counter for each possible signal value | |
1736 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
1737 | |
1738 // Linux(POSIX) specific hand shaking semaphore. | |
1739 static sem_t sig_sem; | |
1740 | |
1741 void os::signal_init_pd() { | |
1742 // Initialize signal structures | |
1743 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
1744 | |
1745 // Initialize signal semaphore | |
1746 int rc = ::sem_init(&sig_sem, 0, 0); | |
1747 guarantee(rc != -1, "sem_init failed"); | |
1748 } | |
1749 | |
1750 void os::signal_notify(int sig) { | |
1751 Atomic::inc(&pending_signals[sig]); | |
1752 ::sem_post(&sig_sem); | |
1753 } | |
1754 | |
1755 static int check_pending_signals(bool wait) { | |
1756 Atomic::store(0, &sigint_count); | |
1757 for (;;) { | |
1758 for (int i = 0; i < NSIG + 1; i++) { | |
1759 jint n = pending_signals[i]; | |
1760 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
1761 return i; | |
1762 } | |
1763 } | |
1764 if (!wait) { | |
1765 return -1; | |
1766 } | |
1767 JavaThread *thread = JavaThread::current(); | |
1768 ThreadBlockInVM tbivm(thread); | |
1769 | |
1770 bool threadIsSuspended; | |
1771 do { | |
1772 thread->set_suspend_equivalent(); | |
1773 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
1774 | |
1775 ::sem_wait(&sig_sem); | |
1776 | |
1777 // were we externally suspended while we were waiting? | |
1778 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
1779 if (threadIsSuspended) { | |
1780 // | |
1781 // The semaphore has been incremented, but while we were waiting | |
1782 // another thread suspended us. We don't want to continue running | |
1783 // while suspended because that would surprise the thread that | |
1784 // suspended us. | |
1785 // | |
1786 ::sem_post(&sig_sem); | |
1787 | |
1788 thread->java_suspend_self(); | |
1789 } | |
1790 } while (threadIsSuspended); | |
1791 } | |
1792 } | |
1793 | |
1794 int os::signal_lookup() { | |
1795 return check_pending_signals(false); | |
1796 } | |
1797 | |
1798 int os::signal_wait() { | |
1799 return check_pending_signals(true); | |
1800 } | |
1801 | |
1802 //////////////////////////////////////////////////////////////////////////////// | |
1803 // Virtual Memory | |
1804 | |
1805 // AddrRange describes an immutable address range | |
1806 // | |
1807 // This is a helper class for the 'shared memory bookkeeping' below. | |
1808 class AddrRange { | |
1809 friend class ShmBkBlock; | |
1810 | |
1811 char* _start; | |
1812 size_t _size; | |
1813 | |
1814 public: | |
1815 | |
1816 AddrRange(char* start, size_t size) | |
1817 : _start(start), _size(size) | |
1818 {} | |
1819 | |
1820 AddrRange(const AddrRange& r) | |
1821 : _start(r.start()), _size(r.size()) | |
1822 {} | |
1823 | |
1824 char* start() const { return _start; } | |
1825 size_t size() const { return _size; } | |
1826 char* end() const { return _start + _size; } | |
1827 bool is_empty() const { return _size == 0 ? true : false; } | |
1828 | |
1829 static AddrRange empty_range() { return AddrRange(NULL, 0); } | |
1830 | |
1831 bool contains(const char* p) const { | |
1832 return start() <= p && end() > p; | |
1833 } | |
1834 | |
1835 bool contains(const AddrRange& range) const { | |
1836 return start() <= range.start() && end() >= range.end(); | |
1837 } | |
1838 | |
1839 bool intersects(const AddrRange& range) const { | |
1840 return (range.start() <= start() && range.end() > start()) || | |
1841 (range.start() < end() && range.end() >= end()) || | |
1842 contains(range); | |
1843 } | |
1844 | |
1845 bool is_same_range(const AddrRange& range) const { | |
1846 return start() == range.start() && size() == range.size(); | |
1847 } | |
1848 | |
1849 // return the closest inside range consisting of whole pages | |
1850 AddrRange find_closest_aligned_range(size_t pagesize) const { | |
1851 if (pagesize == 0 || is_empty()) { | |
1852 return empty_range(); | |
1853 } | |
1854 char* const from = (char*)align_size_up((intptr_t)_start, pagesize); | |
1855 char* const to = (char*)align_size_down((intptr_t)end(), pagesize); | |
1856 if (from > to) { | |
1857 return empty_range(); | |
1858 } | |
1859 return AddrRange(from, to - from); | |
1860 } | |
1861 }; | |
1862 | |
1863 //////////////////////////////////////////////////////////////////////////// | |
1864 // shared memory bookkeeping | |
1865 // | |
1866 // the os::reserve_memory() API and friends hand out different kind of memory, depending | |
1867 // on need and circumstances. Memory may be allocated with mmap() or with shmget/shmat. | |
1868 // | |
1869 // But these memory types have to be treated differently. For example, to uncommit | |
1870 // mmap-based memory, msync(MS_INVALIDATE) is needed, to uncommit shmat-based memory, | |
1871 // disclaim64() is needed. | |
1872 // | |
1873 // Therefore we need to keep track of the allocated memory segments and their | |
1874 // properties. | |
1875 | |
1876 // ShmBkBlock: base class for all blocks in the shared memory bookkeeping | |
1877 class ShmBkBlock { | |
1878 | |
1879 ShmBkBlock* _next; | |
1880 | |
1881 protected: | |
1882 | |
1883 AddrRange _range; | |
1884 const size_t _pagesize; | |
1885 const bool _pinned; | |
1886 | |
1887 public: | |
1888 | |
1889 ShmBkBlock(AddrRange range, size_t pagesize, bool pinned) | |
1890 : _range(range), _pagesize(pagesize), _pinned(pinned) , _next(NULL) { | |
1891 | |
1892 assert(_pagesize == SIZE_4K || _pagesize == SIZE_64K || _pagesize == SIZE_16M, "invalid page size"); | |
1893 assert(!_range.is_empty(), "invalid range"); | |
1894 } | |
1895 | |
1896 virtual void print(outputStream* st) const { | |
1897 st->print("0x%p ... 0x%p (%llu) - %d %s pages - %s", | |
1898 _range.start(), _range.end(), _range.size(), | |
1899 _range.size() / _pagesize, describe_pagesize(_pagesize), | |
1900 _pinned ? "pinned" : ""); | |
1901 } | |
1902 | |
1903 enum Type { MMAP, SHMAT }; | |
1904 virtual Type getType() = 0; | |
1905 | |
1906 char* base() const { return _range.start(); } | |
1907 size_t size() const { return _range.size(); } | |
1908 | |
1909 void setAddrRange(AddrRange range) { | |
1910 _range = range; | |
1911 } | |
1912 | |
1913 bool containsAddress(const char* p) const { | |
1914 return _range.contains(p); | |
1915 } | |
1916 | |
1917 bool containsRange(const char* p, size_t size) const { | |
1918 return _range.contains(AddrRange((char*)p, size)); | |
1919 } | |
1920 | |
1921 bool isSameRange(const char* p, size_t size) const { | |
1922 return _range.is_same_range(AddrRange((char*)p, size)); | |
1923 } | |
1924 | |
1925 virtual bool disclaim(char* p, size_t size) = 0; | |
1926 virtual bool release() = 0; | |
1927 | |
1928 // blocks live in a list. | |
1929 ShmBkBlock* next() const { return _next; } | |
1930 void set_next(ShmBkBlock* blk) { _next = blk; } | |
1931 | |
1932 }; // end: ShmBkBlock | |
1933 | |
1934 | |
1935 // ShmBkMappedBlock: describes an block allocated with mmap() | |
1936 class ShmBkMappedBlock : public ShmBkBlock { | |
1937 public: | |
1938 | |
1939 ShmBkMappedBlock(AddrRange range) | |
1940 : ShmBkBlock(range, SIZE_4K, false) {} // mmap: always 4K, never pinned | |
1941 | |
1942 void print(outputStream* st) const { | |
1943 ShmBkBlock::print(st); | |
1944 st->print_cr(" - mmap'ed"); | |
1945 } | |
1946 | |
1947 Type getType() { | |
1948 return MMAP; | |
1949 } | |
1950 | |
1951 bool disclaim(char* p, size_t size) { | |
1952 | |
1953 AddrRange r(p, size); | |
1954 | |
1955 guarantee(_range.contains(r), "invalid disclaim"); | |
1956 | |
1957 // only disclaim whole ranges. | |
1958 const AddrRange r2 = r.find_closest_aligned_range(_pagesize); | |
1959 if (r2.is_empty()) { | |
1960 return true; | |
1961 } | |
1962 | |
1963 const int rc = ::msync(r2.start(), r2.size(), MS_INVALIDATE); | |
1964 | |
1965 if (rc != 0) { | |
1966 warning("msync(0x%p, %llu, MS_INVALIDATE) failed (%d)\n", r2.start(), r2.size(), errno); | |
1967 } | |
1968 | |
1969 return rc == 0 ? true : false; | |
1970 } | |
1971 | |
1972 bool release() { | |
1973 // mmap'ed blocks are released using munmap | |
1974 if (::munmap(_range.start(), _range.size()) != 0) { | |
1975 warning("munmap(0x%p, %llu) failed (%d)\n", _range.start(), _range.size(), errno); | |
1976 return false; | |
1977 } | |
1978 return true; | |
1979 } | |
1980 }; // end: ShmBkMappedBlock | |
1981 | |
1982 // ShmBkShmatedBlock: describes an block allocated with shmget/shmat() | |
1983 class ShmBkShmatedBlock : public ShmBkBlock { | |
1984 public: | |
1985 | |
1986 ShmBkShmatedBlock(AddrRange range, size_t pagesize, bool pinned) | |
1987 : ShmBkBlock(range, pagesize, pinned) {} | |
1988 | |
1989 void print(outputStream* st) const { | |
1990 ShmBkBlock::print(st); | |
1991 st->print_cr(" - shmat'ed"); | |
1992 } | |
1993 | |
1994 Type getType() { | |
1995 return SHMAT; | |
1996 } | |
1997 | |
1998 bool disclaim(char* p, size_t size) { | |
1999 | |
2000 AddrRange r(p, size); | |
2001 | |
2002 if (_pinned) { | |
2003 return true; | |
2004 } | |
2005 | |
2006 // shmat'ed blocks are disclaimed using disclaim64 | |
2007 guarantee(_range.contains(r), "invalid disclaim"); | |
2008 | |
2009 // only disclaim whole ranges. | |
2010 const AddrRange r2 = r.find_closest_aligned_range(_pagesize); | |
2011 if (r2.is_empty()) { | |
2012 return true; | |
2013 } | |
2014 | |
2015 const bool rc = my_disclaim64(r2.start(), r2.size()); | |
2016 | |
2017 if (Verbose && !rc) { | |
2018 warning("failed to disclaim shm %p-%p\n", r2.start(), r2.end()); | |
2019 } | |
2020 | |
2021 return rc; | |
2022 } | |
2023 | |
2024 bool release() { | |
2025 bool rc = false; | |
2026 if (::shmdt(_range.start()) != 0) { | |
2027 warning("shmdt(0x%p) failed (%d)\n", _range.start(), errno); | |
2028 } else { | |
2029 rc = true; | |
2030 } | |
2031 return rc; | |
2032 } | |
2033 | |
2034 }; // end: ShmBkShmatedBlock | |
2035 | |
2036 static ShmBkBlock* g_shmbk_list = NULL; | |
2037 static volatile jint g_shmbk_table_lock = 0; | |
2038 | |
2039 // keep some usage statistics | |
2040 static struct { | |
2041 int nodes; // number of nodes in list | |
2042 size_t bytes; // reserved - not committed - bytes. | |
2043 int reserves; // how often reserve was called | |
2044 int lookups; // how often a lookup was made | |
2045 } g_shmbk_stats = { 0, 0, 0, 0 }; | |
2046 | |
2047 // add information about a shared memory segment to the bookkeeping | |
2048 static void shmbk_register(ShmBkBlock* p_block) { | |
2049 guarantee(p_block, "logic error"); | |
2050 p_block->set_next(g_shmbk_list); | |
2051 g_shmbk_list = p_block; | |
2052 g_shmbk_stats.reserves ++; | |
2053 g_shmbk_stats.bytes += p_block->size(); | |
2054 g_shmbk_stats.nodes ++; | |
2055 } | |
2056 | |
2057 // remove information about a shared memory segment by its starting address | |
2058 static void shmbk_unregister(ShmBkBlock* p_block) { | |
2059 ShmBkBlock* p = g_shmbk_list; | |
2060 ShmBkBlock* prev = NULL; | |
2061 while (p) { | |
2062 if (p == p_block) { | |
2063 if (prev) { | |
2064 prev->set_next(p->next()); | |
2065 } else { | |
2066 g_shmbk_list = p->next(); | |
2067 } | |
2068 g_shmbk_stats.nodes --; | |
2069 g_shmbk_stats.bytes -= p->size(); | |
2070 return; | |
2071 } | |
2072 prev = p; | |
2073 p = p->next(); | |
2074 } | |
2075 assert(false, "should not happen"); | |
2076 } | |
2077 | |
2078 // given a pointer, return shared memory bookkeeping record for the segment it points into | |
2079 // using the returned block info must happen under lock protection | |
2080 static ShmBkBlock* shmbk_find_by_containing_address(const char* addr) { | |
2081 g_shmbk_stats.lookups ++; | |
2082 ShmBkBlock* p = g_shmbk_list; | |
2083 while (p) { | |
2084 if (p->containsAddress(addr)) { | |
2085 return p; | |
2086 } | |
2087 p = p->next(); | |
2088 } | |
2089 return NULL; | |
2090 } | |
2091 | |
2092 // dump all information about all memory segments allocated with os::reserve_memory() | |
2093 void shmbk_dump_info() { | |
2094 tty->print_cr("-- shared mem bookkeeping (alive: %d segments, %llu bytes, " | |
2095 "total reserves: %d total lookups: %d)", | |
2096 g_shmbk_stats.nodes, g_shmbk_stats.bytes, g_shmbk_stats.reserves, g_shmbk_stats.lookups); | |
2097 const ShmBkBlock* p = g_shmbk_list; | |
2098 int i = 0; | |
2099 while (p) { | |
2100 p->print(tty); | |
2101 p = p->next(); | |
2102 i ++; | |
2103 } | |
2104 } | |
2105 | |
2106 #define LOCK_SHMBK { ThreadCritical _LOCK_SHMBK; | |
2107 #define UNLOCK_SHMBK } | |
2108 | |
2109 // End: shared memory bookkeeping | |
2110 //////////////////////////////////////////////////////////////////////////////////////////////////// | |
2111 | |
2112 int os::vm_page_size() { | |
2113 // Seems redundant as all get out | |
2114 assert(os::Aix::page_size() != -1, "must call os::init"); | |
2115 return os::Aix::page_size(); | |
2116 } | |
2117 | |
2118 // Aix allocates memory by pages. | |
2119 int os::vm_allocation_granularity() { | |
2120 assert(os::Aix::page_size() != -1, "must call os::init"); | |
2121 return os::Aix::page_size(); | |
2122 } | |
2123 | |
2124 int os::Aix::commit_memory_impl(char* addr, size_t size, bool exec) { | |
2125 | |
2126 // Commit is a noop. There is no explicit commit | |
2127 // needed on AIX. Memory is committed when touched. | |
2128 // | |
2129 // Debug : check address range for validity | |
2130 #ifdef ASSERT | |
2131 LOCK_SHMBK | |
2132 ShmBkBlock* const block = shmbk_find_by_containing_address(addr); | |
2133 if (!block) { | |
2134 fprintf(stderr, "invalid pointer: " INTPTR_FORMAT "\n", addr); | |
2135 shmbk_dump_info(); | |
2136 assert(false, "invalid pointer"); | |
2137 return false; | |
2138 } else if (!block->containsRange(addr, size)) { | |
2139 fprintf(stderr, "invalid range: " INTPTR_FORMAT " .. " INTPTR_FORMAT "\n", addr, addr + size); | |
2140 shmbk_dump_info(); | |
2141 assert(false, "invalid range"); | |
2142 return false; | |
2143 } | |
2144 UNLOCK_SHMBK | |
2145 #endif // ASSERT | |
2146 | |
2147 return 0; | |
2148 } | |
2149 | |
2150 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { | |
2151 return os::Aix::commit_memory_impl(addr, size, exec) == 0; | |
2152 } | |
2153 | |
2154 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, | |
2155 const char* mesg) { | |
2156 assert(mesg != NULL, "mesg must be specified"); | |
2157 os::Aix::commit_memory_impl(addr, size, exec); | |
2158 } | |
2159 | |
2160 int os::Aix::commit_memory_impl(char* addr, size_t size, | |
2161 size_t alignment_hint, bool exec) { | |
2162 return os::Aix::commit_memory_impl(addr, size, exec); | |
2163 } | |
2164 | |
2165 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, | |
2166 bool exec) { | |
2167 return os::Aix::commit_memory_impl(addr, size, alignment_hint, exec) == 0; | |
2168 } | |
2169 | |
2170 void os::pd_commit_memory_or_exit(char* addr, size_t size, | |
2171 size_t alignment_hint, bool exec, | |
2172 const char* mesg) { | |
2173 os::Aix::commit_memory_impl(addr, size, alignment_hint, exec); | |
2174 } | |
2175 | |
2176 bool os::pd_uncommit_memory(char* addr, size_t size) { | |
2177 | |
2178 // Delegate to ShmBkBlock class which knows how to uncommit its memory. | |
2179 | |
2180 bool rc = false; | |
2181 LOCK_SHMBK | |
2182 ShmBkBlock* const block = shmbk_find_by_containing_address(addr); | |
2183 if (!block) { | |
2184 fprintf(stderr, "invalid pointer: 0x%p.\n", addr); | |
2185 shmbk_dump_info(); | |
2186 assert(false, "invalid pointer"); | |
2187 return false; | |
2188 } else if (!block->containsRange(addr, size)) { | |
2189 fprintf(stderr, "invalid range: 0x%p .. 0x%p.\n", addr, addr + size); | |
2190 shmbk_dump_info(); | |
2191 assert(false, "invalid range"); | |
2192 return false; | |
2193 } | |
2194 rc = block->disclaim(addr, size); | |
2195 UNLOCK_SHMBK | |
2196 | |
2197 if (Verbose && !rc) { | |
2198 warning("failed to disclaim 0x%p .. 0x%p (0x%llX bytes).", addr, addr + size, size); | |
2199 } | |
2200 return rc; | |
2201 } | |
2202 | |
2203 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { | |
2204 return os::guard_memory(addr, size); | |
2205 } | |
2206 | |
2207 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
2208 return os::unguard_memory(addr, size); | |
2209 } | |
2210 | |
2211 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
2212 } | |
2213 | |
2214 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { | |
2215 } | |
2216 | |
2217 void os::numa_make_global(char *addr, size_t bytes) { | |
2218 } | |
2219 | |
2220 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2221 } | |
2222 | |
2223 bool os::numa_topology_changed() { | |
2224 return false; | |
2225 } | |
2226 | |
2227 size_t os::numa_get_groups_num() { | |
2228 return 1; | |
2229 } | |
2230 | |
2231 int os::numa_get_group_id() { | |
2232 return 0; | |
2233 } | |
2234 | |
2235 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
2236 if (size > 0) { | |
2237 ids[0] = 0; | |
2238 return 1; | |
2239 } | |
2240 return 0; | |
2241 } | |
2242 | |
2243 bool os::get_page_info(char *start, page_info* info) { | |
2244 return false; | |
2245 } | |
2246 | |
2247 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2248 return end; | |
2249 } | |
2250 | |
2251 // Flags for reserve_shmatted_memory: | |
2252 #define RESSHM_WISHADDR_OR_FAIL 1 | |
2253 #define RESSHM_TRY_16M_PAGES 2 | |
2254 #define RESSHM_16M_PAGES_OR_FAIL 4 | |
2255 | |
2256 // Result of reserve_shmatted_memory: | |
2257 struct shmatted_memory_info_t { | |
2258 char* addr; | |
2259 size_t pagesize; | |
2260 bool pinned; | |
2261 }; | |
2262 | |
2263 // Reserve a section of shmatted memory. | |
2264 // params: | |
2265 // bytes [in]: size of memory, in bytes | |
2266 // requested_addr [in]: wish address. | |
2267 // NULL = no wish. | |
2268 // If RESSHM_WISHADDR_OR_FAIL is set in flags and wish address cannot | |
2269 // be obtained, function will fail. Otherwise wish address is treated as hint and | |
2270 // another pointer is returned. | |
2271 // flags [in]: some flags. Valid flags are: | |
2272 // RESSHM_WISHADDR_OR_FAIL - fail if wish address is given and cannot be obtained. | |
2273 // RESSHM_TRY_16M_PAGES - try to allocate from 16M page pool | |
2274 // (requires UseLargePages and Use16MPages) | |
2275 // RESSHM_16M_PAGES_OR_FAIL - if you cannot allocate from 16M page pool, fail. | |
2276 // Otherwise any other page size will do. | |
2277 // p_info [out] : holds information about the created shared memory segment. | |
2278 static bool reserve_shmatted_memory(size_t bytes, char* requested_addr, int flags, shmatted_memory_info_t* p_info) { | |
2279 | |
2280 assert(p_info, "parameter error"); | |
2281 | |
2282 // init output struct. | |
2283 p_info->addr = NULL; | |
2284 | |
2285 // neither should we be here for EXTSHM=ON. | |
2286 if (os::Aix::extshm()) { | |
2287 ShouldNotReachHere(); | |
2288 } | |
2289 | |
2290 // extract flags. sanity checks. | |
2291 const bool wishaddr_or_fail = | |
2292 flags & RESSHM_WISHADDR_OR_FAIL; | |
2293 const bool try_16M_pages = | |
2294 flags & RESSHM_TRY_16M_PAGES; | |
2295 const bool f16M_pages_or_fail = | |
2296 flags & RESSHM_16M_PAGES_OR_FAIL; | |
2297 | |
2298 // first check: if a wish address is given and it is mandatory, but not aligned to segment boundary, | |
2299 // shmat will fail anyway, so save some cycles by failing right away | |
2300 if (requested_addr && ((uintptr_t)requested_addr % SIZE_256M == 0)) { | |
2301 if (wishaddr_or_fail) { | |
2302 return false; | |
2303 } else { | |
2304 requested_addr = NULL; | |
2305 } | |
2306 } | |
2307 | |
2308 char* addr = NULL; | |
2309 | |
2310 // Align size of shm up to the largest possible page size, to avoid errors later on when we try to change | |
2311 // pagesize dynamically. | |
2312 const size_t size = align_size_up(bytes, SIZE_16M); | |
2313 | |
2314 // reserve the shared segment | |
2315 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); | |
2316 if (shmid == -1) { | |
2317 warning("shmget(.., %lld, ..) failed (errno: %d).", size, errno); | |
2318 return false; | |
2319 } | |
2320 | |
2321 // Important note: | |
2322 // It is very important that we, upon leaving this function, do not leave a shm segment alive. | |
2323 // We must right after attaching it remove it from the system. System V shm segments are global and | |
2324 // survive the process. | |
2325 // So, from here on: Do not assert. Do not return. Always do a "goto cleanup_shm". | |
2326 | |
2327 // try forcing the page size | |
2328 size_t pagesize = -1; // unknown so far | |
2329 | |
2330 if (UseLargePages) { | |
2331 | |
2332 struct shmid_ds shmbuf; | |
2333 memset(&shmbuf, 0, sizeof(shmbuf)); | |
2334 | |
2335 // First, try to take from 16M page pool if... | |
2336 if (os::Aix::can_use_16M_pages() // we can ... | |
2337 && Use16MPages // we are not explicitly forbidden to do so (-XX:-Use16MPages).. | |
2338 && try_16M_pages) { // caller wants us to. | |
2339 shmbuf.shm_pagesize = SIZE_16M; | |
2340 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) { | |
2341 pagesize = SIZE_16M; | |
2342 } else { | |
2343 warning("Failed to allocate %d 16M pages. 16M page pool might be exhausted. (shmctl failed with %d)", | |
2344 size / SIZE_16M, errno); | |
2345 if (f16M_pages_or_fail) { | |
2346 goto cleanup_shm; | |
2347 } | |
2348 } | |
2349 } | |
2350 | |
2351 // Nothing yet? Try setting 64K pages. Note that I never saw this fail, but in theory it might, | |
2352 // because the 64K page pool may also be exhausted. | |
2353 if (pagesize == -1) { | |
2354 shmbuf.shm_pagesize = SIZE_64K; | |
2355 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) == 0) { | |
2356 pagesize = SIZE_64K; | |
2357 } else { | |
2358 warning("Failed to allocate %d 64K pages. (shmctl failed with %d)", | |
2359 size / SIZE_64K, errno); | |
2360 // here I give up. leave page_size -1 - later, after attaching, we will query the | |
2361 // real page size of the attached memory. (in theory, it may be something different | |
2362 // from 4K if LDR_CNTRL SHM_PSIZE is set) | |
2363 } | |
2364 } | |
2365 } | |
2366 | |
2367 // sanity point | |
2368 assert(pagesize == -1 || pagesize == SIZE_16M || pagesize == SIZE_64K, "wrong page size"); | |
2369 | |
2370 // Now attach the shared segment. | |
2371 addr = (char*) shmat(shmid, requested_addr, 0); | |
2372 if (addr == (char*)-1) { | |
2373 // How to handle attach failure: | |
2374 // If it failed for a specific wish address, tolerate this: in that case, if wish address was | |
2375 // mandatory, fail, if not, retry anywhere. | |
2376 // If it failed for any other reason, treat that as fatal error. | |
2377 addr = NULL; | |
2378 if (requested_addr) { | |
2379 if (wishaddr_or_fail) { | |
2380 goto cleanup_shm; | |
2381 } else { | |
2382 addr = (char*) shmat(shmid, NULL, 0); | |
2383 if (addr == (char*)-1) { // fatal | |
2384 addr = NULL; | |
2385 warning("shmat failed (errno: %d)", errno); | |
2386 goto cleanup_shm; | |
2387 } | |
2388 } | |
2389 } else { // fatal | |
2390 addr = NULL; | |
2391 warning("shmat failed (errno: %d)", errno); | |
2392 goto cleanup_shm; | |
2393 } | |
2394 } | |
2395 | |
2396 // sanity point | |
2397 assert(addr && addr != (char*) -1, "wrong address"); | |
2398 | |
2399 // after successful Attach remove the segment - right away. | |
2400 if (::shmctl(shmid, IPC_RMID, NULL) == -1) { | |
2401 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); | |
2402 guarantee(false, "failed to remove shared memory segment!"); | |
2403 } | |
2404 shmid = -1; | |
2405 | |
2406 // query the real page size. In case setting the page size did not work (see above), the system | |
2407 // may have given us something other then 4K (LDR_CNTRL) | |
2408 { | |
2409 const size_t real_pagesize = os::Aix::query_pagesize(addr); | |
2410 if (pagesize != -1) { | |
2411 assert(pagesize == real_pagesize, "unexpected pagesize after shmat"); | |
2412 } else { | |
2413 pagesize = real_pagesize; | |
2414 } | |
2415 } | |
2416 | |
2417 // Now register the reserved block with internal book keeping. | |
2418 LOCK_SHMBK | |
2419 const bool pinned = pagesize >= SIZE_16M ? true : false; | |
2420 ShmBkShmatedBlock* const p_block = new ShmBkShmatedBlock(AddrRange(addr, size), pagesize, pinned); | |
2421 assert(p_block, ""); | |
2422 shmbk_register(p_block); | |
2423 UNLOCK_SHMBK | |
2424 | |
2425 cleanup_shm: | |
2426 | |
2427 // if we have not done so yet, remove the shared memory segment. This is very important. | |
2428 if (shmid != -1) { | |
2429 if (::shmctl(shmid, IPC_RMID, NULL) == -1) { | |
2430 warning("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); | |
2431 guarantee(false, "failed to remove shared memory segment!"); | |
2432 } | |
2433 shmid = -1; | |
2434 } | |
2435 | |
2436 // trace | |
2437 if (Verbose && !addr) { | |
2438 if (requested_addr != NULL) { | |
2439 warning("failed to shm-allocate 0x%llX bytes at with address 0x%p.", size, requested_addr); | |
2440 } else { | |
2441 warning("failed to shm-allocate 0x%llX bytes at any address.", size); | |
2442 } | |
2443 } | |
2444 | |
2445 // hand info to caller | |
2446 if (addr) { | |
2447 p_info->addr = addr; | |
2448 p_info->pagesize = pagesize; | |
2449 p_info->pinned = pagesize == SIZE_16M ? true : false; | |
2450 } | |
2451 | |
2452 // sanity test: | |
2453 if (requested_addr && addr && wishaddr_or_fail) { | |
2454 guarantee(addr == requested_addr, "shmat error"); | |
2455 } | |
2456 | |
2457 // just one more test to really make sure we have no dangling shm segments. | |
2458 guarantee(shmid == -1, "dangling shm segments"); | |
2459 | |
2460 return addr ? true : false; | |
2461 | |
2462 } // end: reserve_shmatted_memory | |
2463 | |
2464 // Reserve memory using mmap. Behaves the same as reserve_shmatted_memory(): | |
2465 // will return NULL in case of an error. | |
2466 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr) { | |
2467 | |
2468 // if a wish address is given, but not aligned to 4K page boundary, mmap will fail. | |
2469 if (requested_addr && ((uintptr_t)requested_addr % os::vm_page_size() != 0)) { | |
2470 warning("Wish address 0x%p not aligned to page boundary.", requested_addr); | |
2471 return NULL; | |
2472 } | |
2473 | |
2474 const size_t size = align_size_up(bytes, SIZE_4K); | |
2475 | |
2476 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to | |
2477 // msync(MS_INVALIDATE) (see os::uncommit_memory) | |
2478 int flags = MAP_ANONYMOUS | MAP_SHARED; | |
2479 | |
2480 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what | |
2481 // it means if wishaddress is given but MAP_FIXED is not set. | |
2482 // | |
2483 // Note however that this changes semantics in SPEC1170 mode insofar as MAP_FIXED | |
2484 // clobbers the address range, which is probably not what the caller wants. That's | |
2485 // why I assert here (again) that the SPEC1170 compat mode is off. | |
2486 // If we want to be able to run under SPEC1170, we have to do some porting and | |
2487 // testing. | |
2488 if (requested_addr != NULL) { | |
2489 assert(!os::Aix::xpg_sus_mode(), "SPEC1170 mode not allowed."); | |
2490 flags |= MAP_FIXED; | |
2491 } | |
2492 | |
2493 char* addr = (char*)::mmap(requested_addr, size, PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); | |
2494 | |
2495 if (addr == MAP_FAILED) { | |
2496 // attach failed: tolerate for specific wish addresses. Not being able to attach | |
2497 // anywhere is a fatal error. | |
2498 if (requested_addr == NULL) { | |
2499 // It's ok to fail here if the machine has not enough memory. | |
2500 warning("mmap(NULL, 0x%llX, ..) failed (%d)", size, errno); | |
2501 } | |
2502 addr = NULL; | |
2503 goto cleanup_mmap; | |
2504 } | |
2505 | |
2506 // If we did request a specific address and that address was not available, fail. | |
2507 if (addr && requested_addr) { | |
2508 guarantee(addr == requested_addr, "unexpected"); | |
2509 } | |
2510 | |
2511 // register this mmap'ed segment with book keeping | |
2512 LOCK_SHMBK | |
2513 ShmBkMappedBlock* const p_block = new ShmBkMappedBlock(AddrRange(addr, size)); | |
2514 assert(p_block, ""); | |
2515 shmbk_register(p_block); | |
2516 UNLOCK_SHMBK | |
2517 | |
2518 cleanup_mmap: | |
2519 | |
2520 if (addr) { | |
2521 if (Verbose) { | |
2522 fprintf(stderr, "mmap-allocated 0x%p .. 0x%p (0x%llX bytes)\n", addr, addr + bytes, bytes); | |
2523 } | |
2524 } | |
2525 else { | |
2526 if (requested_addr != NULL) { | |
2527 warning("failed to mmap-allocate 0x%llX bytes at wish address 0x%p.", bytes, requested_addr); | |
2528 } else { | |
2529 warning("failed to mmap-allocate 0x%llX bytes at any address.", bytes); | |
2530 } | |
2531 } | |
2532 | |
2533 return addr; | |
2534 | |
2535 } // end: reserve_mmaped_memory | |
2536 | |
2537 // Reserves and attaches a shared memory segment. | |
2538 // Will assert if a wish address is given and could not be obtained. | |
2539 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { | |
2540 return os::attempt_reserve_memory_at(bytes, requested_addr); | |
2541 } | |
2542 | |
2543 bool os::pd_release_memory(char* addr, size_t size) { | |
2544 | |
2545 // delegate to ShmBkBlock class which knows how to uncommit its memory. | |
2546 | |
2547 bool rc = false; | |
2548 LOCK_SHMBK | |
2549 ShmBkBlock* const block = shmbk_find_by_containing_address(addr); | |
2550 if (!block) { | |
2551 fprintf(stderr, "invalid pointer: 0x%p.\n", addr); | |
2552 shmbk_dump_info(); | |
2553 assert(false, "invalid pointer"); | |
2554 return false; | |
2555 } | |
2556 else if (!block->isSameRange(addr, size)) { | |
2557 if (block->getType() == ShmBkBlock::MMAP) { | |
2558 // Release only the same range or a the beginning or the end of a range. | |
2559 if (block->base() == addr && size < block->size()) { | |
2560 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base() + size, block->size() - size)); | |
2561 assert(b, ""); | |
2562 shmbk_register(b); | |
2563 block->setAddrRange(AddrRange(addr, size)); | |
2564 } | |
2565 else if (addr > block->base() && addr + size == block->base() + block->size()) { | |
2566 ShmBkMappedBlock* const b = new ShmBkMappedBlock(AddrRange(block->base(), block->size() - size)); | |
2567 assert(b, ""); | |
2568 shmbk_register(b); | |
2569 block->setAddrRange(AddrRange(addr, size)); | |
2570 } | |
2571 else { | |
2572 fprintf(stderr, "invalid mmap range: 0x%p .. 0x%p.\n", addr, addr + size); | |
2573 shmbk_dump_info(); | |
2574 assert(false, "invalid mmap range"); | |
2575 return false; | |
2576 } | |
2577 } | |
2578 else { | |
2579 // Release only the same range. No partial release allowed. | |
2580 // Soften the requirement a bit, because the user may think he owns a smaller size | |
2581 // than the block is due to alignment etc. | |
2582 if (block->base() != addr || block->size() < size) { | |
2583 fprintf(stderr, "invalid shmget range: 0x%p .. 0x%p.\n", addr, addr + size); | |
2584 shmbk_dump_info(); | |
2585 assert(false, "invalid shmget range"); | |
2586 return false; | |
2587 } | |
2588 } | |
2589 } | |
2590 rc = block->release(); | |
2591 assert(rc, "release failed"); | |
2592 // remove block from bookkeeping | |
2593 shmbk_unregister(block); | |
2594 delete block; | |
2595 UNLOCK_SHMBK | |
2596 | |
2597 if (!rc) { | |
2598 warning("failed to released %lu bytes at 0x%p", size, addr); | |
2599 } | |
2600 | |
2601 return rc; | |
2602 } | |
2603 | |
2604 static bool checked_mprotect(char* addr, size_t size, int prot) { | |
2605 | |
2606 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will | |
2607 // not tell me if protection failed when trying to protect an un-protectable range. | |
2608 // | |
2609 // This means if the memory was allocated using shmget/shmat, protection wont work | |
2610 // but mprotect will still return 0: | |
2611 // | |
2612 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm | |
2613 | |
2614 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; | |
2615 | |
2616 if (!rc) { | |
2617 const char* const s_errno = strerror(errno); | |
2618 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno); | |
2619 return false; | |
2620 } | |
2621 | |
2622 // mprotect success check | |
2623 // | |
2624 // Mprotect said it changed the protection but can I believe it? | |
2625 // | |
2626 // To be sure I need to check the protection afterwards. Try to | |
2627 // read from protected memory and check whether that causes a segfault. | |
2628 // | |
2629 if (!os::Aix::xpg_sus_mode()) { | |
2630 | |
2631 if (StubRoutines::SafeFetch32_stub()) { | |
2632 | |
2633 const bool read_protected = | |
2634 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && | |
2635 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; | |
2636 | |
2637 if (prot & PROT_READ) { | |
2638 rc = !read_protected; | |
2639 } else { | |
2640 rc = read_protected; | |
2641 } | |
2642 } | |
2643 } | |
2644 if (!rc) { | |
2645 assert(false, "mprotect failed."); | |
2646 } | |
2647 return rc; | |
2648 } | |
2649 | |
2650 // Set protections specified | |
2651 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { | |
2652 unsigned int p = 0; | |
2653 switch (prot) { | |
2654 case MEM_PROT_NONE: p = PROT_NONE; break; | |
2655 case MEM_PROT_READ: p = PROT_READ; break; | |
2656 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
2657 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
2658 default: | |
2659 ShouldNotReachHere(); | |
2660 } | |
2661 // is_committed is unused. | |
2662 return checked_mprotect(addr, size, p); | |
2663 } | |
2664 | |
2665 bool os::guard_memory(char* addr, size_t size) { | |
2666 return checked_mprotect(addr, size, PROT_NONE); | |
2667 } | |
2668 | |
2669 bool os::unguard_memory(char* addr, size_t size) { | |
2670 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); | |
2671 } | |
2672 | |
2673 // Large page support | |
2674 | |
2675 static size_t _large_page_size = 0; | |
2676 | |
2677 // Enable large page support if OS allows that. | |
2678 void os::large_page_init() { | |
2679 | |
2680 // Note: os::Aix::query_multipage_support must run first. | |
2681 | |
2682 if (!UseLargePages) { | |
2683 return; | |
2684 } | |
2685 | |
2686 if (!Aix::can_use_64K_pages()) { | |
2687 assert(!Aix::can_use_16M_pages(), "64K is a precondition for 16M."); | |
2688 UseLargePages = false; | |
2689 return; | |
2690 } | |
2691 | |
2692 if (!Aix::can_use_16M_pages() && Use16MPages) { | |
2693 fprintf(stderr, "Cannot use 16M pages. Please ensure that there is a 16M page pool " | |
2694 " and that the VM runs with CAP_BYPASS_RAC_VMM and CAP_PROPAGATE capabilities.\n"); | |
2695 } | |
2696 | |
2697 // Do not report 16M page alignment as part of os::_page_sizes if we are | |
2698 // explicitly forbidden from using 16M pages. Doing so would increase the | |
2699 // alignment the garbage collector calculates with, slightly increasing | |
2700 // heap usage. We should only pay for 16M alignment if we really want to | |
2701 // use 16M pages. | |
2702 if (Use16MPages && Aix::can_use_16M_pages()) { | |
2703 _large_page_size = SIZE_16M; | |
2704 _page_sizes[0] = SIZE_16M; | |
2705 _page_sizes[1] = SIZE_64K; | |
2706 _page_sizes[2] = SIZE_4K; | |
2707 _page_sizes[3] = 0; | |
2708 } else if (Aix::can_use_64K_pages()) { | |
2709 _large_page_size = SIZE_64K; | |
2710 _page_sizes[0] = SIZE_64K; | |
2711 _page_sizes[1] = SIZE_4K; | |
2712 _page_sizes[2] = 0; | |
2713 } | |
2714 | |
2715 if (Verbose) { | |
2716 ("Default large page size is 0x%llX.", _large_page_size); | |
2717 } | |
2718 } // end: os::large_page_init() | |
2719 | |
2720 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { | |
2721 // "exec" is passed in but not used. Creating the shared image for | |
2722 // the code cache doesn't have an SHM_X executable permission to check. | |
2723 Unimplemented(); | |
2724 return 0; | |
2725 } | |
2726 | |
2727 bool os::release_memory_special(char* base, size_t bytes) { | |
2728 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
2729 Unimplemented(); | |
2730 return false; | |
2731 } | |
2732 | |
2733 size_t os::large_page_size() { | |
2734 return _large_page_size; | |
2735 } | |
2736 | |
2737 bool os::can_commit_large_page_memory() { | |
2738 // Well, sadly we cannot commit anything at all (see comment in | |
2739 // os::commit_memory) but we claim to so we can make use of large pages | |
2740 return true; | |
2741 } | |
2742 | |
2743 bool os::can_execute_large_page_memory() { | |
2744 // We can do that | |
2745 return true; | |
2746 } | |
2747 | |
2748 // Reserve memory at an arbitrary address, only if that area is | |
2749 // available (and not reserved for something else). | |
2750 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { | |
2751 | |
2752 bool use_mmap = false; | |
2753 | |
2754 // mmap: smaller graining, no large page support | |
2755 // shm: large graining (256M), large page support, limited number of shm segments | |
2756 // | |
2757 // Prefer mmap wherever we either do not need large page support or have OS limits | |
2758 | |
2759 if (!UseLargePages || bytes < SIZE_16M) { | |
2760 use_mmap = true; | |
2761 } | |
2762 | |
2763 char* addr = NULL; | |
2764 if (use_mmap) { | |
2765 addr = reserve_mmaped_memory(bytes, requested_addr); | |
2766 } else { | |
2767 // shmat: wish address is mandatory, and do not try 16M pages here. | |
2768 shmatted_memory_info_t info; | |
2769 const int flags = RESSHM_WISHADDR_OR_FAIL; | |
2770 if (reserve_shmatted_memory(bytes, requested_addr, flags, &info)) { | |
2771 addr = info.addr; | |
2772 } | |
2773 } | |
2774 | |
2775 return addr; | |
2776 } | |
2777 | |
2778 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
2779 return ::read(fd, buf, nBytes); | |
2780 } | |
2781 | |
2782 #define NANOSECS_PER_MILLISEC 1000000 | |
2783 | |
2784 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
2785 assert(thread == Thread::current(), "thread consistency check"); | |
2786 | |
2787 // Prevent nasty overflow in deadline calculation | |
2788 // by handling long sleeps similar to solaris or windows. | |
2789 const jlong limit = INT_MAX; | |
2790 int result; | |
2791 while (millis > limit) { | |
2792 if ((result = os::sleep(thread, limit, interruptible)) != OS_OK) { | |
2793 return result; | |
2794 } | |
2795 millis -= limit; | |
2796 } | |
2797 | |
2798 ParkEvent * const slp = thread->_SleepEvent; | |
2799 slp->reset(); | |
2800 OrderAccess::fence(); | |
2801 | |
2802 if (interruptible) { | |
2803 jlong prevtime = javaTimeNanos(); | |
2804 | |
2805 // Prevent precision loss and too long sleeps | |
2806 jlong deadline = prevtime + millis * NANOSECS_PER_MILLISEC; | |
2807 | |
2808 for (;;) { | |
2809 if (os::is_interrupted(thread, true)) { | |
2810 return OS_INTRPT; | |
2811 } | |
2812 | |
2813 jlong newtime = javaTimeNanos(); | |
2814 | |
2815 assert(newtime >= prevtime, "time moving backwards"); | |
2816 // Doing prevtime and newtime in microseconds doesn't help precision, | |
2817 // and trying to round up to avoid lost milliseconds can result in a | |
2818 // too-short delay. | |
2819 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; | |
2820 | |
2821 if (millis <= 0) { | |
2822 return OS_OK; | |
2823 } | |
2824 | |
2825 // Stop sleeping if we passed the deadline | |
2826 if (newtime >= deadline) { | |
2827 return OS_OK; | |
2828 } | |
2829 | |
2830 prevtime = newtime; | |
2831 | |
2832 { | |
2833 assert(thread->is_Java_thread(), "sanity check"); | |
2834 JavaThread *jt = (JavaThread *) thread; | |
2835 ThreadBlockInVM tbivm(jt); | |
2836 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
2837 | |
2838 jt->set_suspend_equivalent(); | |
2839 | |
2840 slp->park(millis); | |
2841 | |
2842 // were we externally suspended while we were waiting? | |
2843 jt->check_and_wait_while_suspended(); | |
2844 } | |
2845 } | |
2846 } else { | |
2847 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
2848 jlong prevtime = javaTimeNanos(); | |
2849 | |
2850 // Prevent precision loss and too long sleeps | |
2851 jlong deadline = prevtime + millis * NANOSECS_PER_MILLISEC; | |
2852 | |
2853 for (;;) { | |
2854 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
2855 // the 1st iteration ... | |
2856 jlong newtime = javaTimeNanos(); | |
2857 | |
2858 if (newtime - prevtime < 0) { | |
2859 // time moving backwards, should only happen if no monotonic clock | |
2860 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2861 // - HS14 Commented out as not implemented. | |
2862 // - TODO Maybe we should implement it? | |
2863 //assert(!Aix::supports_monotonic_clock(), "time moving backwards"); | |
2864 } else { | |
2865 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; | |
2866 } | |
2867 | |
2868 if (millis <= 0) break; | |
2869 | |
2870 if (newtime >= deadline) { | |
2871 break; | |
2872 } | |
2873 | |
2874 prevtime = newtime; | |
2875 slp->park(millis); | |
2876 } | |
2877 return OS_OK; | |
2878 } | |
2879 } | |
2880 | |
2881 int os::naked_sleep() { | |
2882 // %% make the sleep time an integer flag. for now use 1 millisec. | |
2883 return os::sleep(Thread::current(), 1, false); | |
2884 } | |
2885 | |
2886 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
2887 void os::infinite_sleep() { | |
2888 while (true) { // sleep forever ... | |
2889 ::sleep(100); // ... 100 seconds at a time | |
2890 } | |
2891 } | |
2892 | |
2893 // Used to convert frequent JVM_Yield() to nops | |
2894 bool os::dont_yield() { | |
2895 return DontYieldALot; | |
2896 } | |
2897 | |
2898 void os::yield() { | |
2899 sched_yield(); | |
2900 } | |
2901 | |
2902 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN; } | |
2903 | |
2904 void os::yield_all(int attempts) { | |
2905 // Yields to all threads, including threads with lower priorities | |
2906 // Threads on Linux are all with same priority. The Solaris style | |
2907 // os::yield_all() with nanosleep(1ms) is not necessary. | |
2908 sched_yield(); | |
2909 } | |
2910 | |
2911 // Called from the tight loops to possibly influence time-sharing heuristics | |
2912 void os::loop_breaker(int attempts) { | |
2913 os::yield_all(attempts); | |
2914 } | |
2915 | |
2916 //////////////////////////////////////////////////////////////////////////////// | |
2917 // thread priority support | |
2918 | |
2919 // From AIX manpage to pthread_setschedparam | |
2920 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? | |
2921 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): | |
2922 // | |
2923 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the | |
2924 // range from 40 to 80, where 40 is the least favored priority and 80 | |
2925 // is the most favored." | |
2926 // | |
2927 // (Actually, I doubt this even has an impact on AIX, as we do kernel | |
2928 // scheduling there; however, this still leaves iSeries.) | |
2929 // | |
2930 // We use the same values for AIX and PASE. | |
2931 int os::java_to_os_priority[CriticalPriority + 1] = { | |
2932 54, // 0 Entry should never be used | |
2933 | |
2934 55, // 1 MinPriority | |
2935 55, // 2 | |
2936 56, // 3 | |
2937 | |
2938 56, // 4 | |
2939 57, // 5 NormPriority | |
2940 57, // 6 | |
2941 | |
2942 58, // 7 | |
2943 58, // 8 | |
2944 59, // 9 NearMaxPriority | |
2945 | |
2946 60, // 10 MaxPriority | |
2947 | |
2948 60 // 11 CriticalPriority | |
2949 }; | |
2950 | |
2951 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
2952 if (!UseThreadPriorities) return OS_OK; | |
2953 pthread_t thr = thread->osthread()->pthread_id(); | |
2954 int policy = SCHED_OTHER; | |
2955 struct sched_param param; | |
2956 param.sched_priority = newpri; | |
2957 int ret = pthread_setschedparam(thr, policy, ¶m); | |
2958 | |
2959 if (Verbose) { | |
2960 if (ret == 0) { | |
2961 fprintf(stderr, "changed priority of thread %d to %d\n", (int)thr, newpri); | |
2962 } else { | |
2963 fprintf(stderr, "Could not changed priority for thread %d to %d (error %d, %s)\n", | |
2964 (int)thr, newpri, ret, strerror(ret)); | |
2965 } | |
2966 } | |
2967 return (ret == 0) ? OS_OK : OS_ERR; | |
2968 } | |
2969 | |
2970 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
2971 if (!UseThreadPriorities) { | |
2972 *priority_ptr = java_to_os_priority[NormPriority]; | |
2973 return OS_OK; | |
2974 } | |
2975 pthread_t thr = thread->osthread()->pthread_id(); | |
2976 int policy = SCHED_OTHER; | |
2977 struct sched_param param; | |
2978 int ret = pthread_getschedparam(thr, &policy, ¶m); | |
2979 *priority_ptr = param.sched_priority; | |
2980 | |
2981 return (ret == 0) ? OS_OK : OS_ERR; | |
2982 } | |
2983 | |
2984 // Hint to the underlying OS that a task switch would not be good. | |
2985 // Void return because it's a hint and can fail. | |
2986 void os::hint_no_preempt() {} | |
2987 | |
2988 //////////////////////////////////////////////////////////////////////////////// | |
2989 // suspend/resume support | |
2990 | |
2991 // the low-level signal-based suspend/resume support is a remnant from the | |
2992 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
2993 // within hotspot. Now there is a single use-case for this: | |
2994 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
2995 // that runs in the watcher thread. | |
2996 // The remaining code is greatly simplified from the more general suspension | |
2997 // code that used to be used. | |
2998 // | |
2999 // The protocol is quite simple: | |
3000 // - suspend: | |
3001 // - sends a signal to the target thread | |
3002 // - polls the suspend state of the osthread using a yield loop | |
3003 // - target thread signal handler (SR_handler) sets suspend state | |
3004 // and blocks in sigsuspend until continued | |
3005 // - resume: | |
3006 // - sets target osthread state to continue | |
3007 // - sends signal to end the sigsuspend loop in the SR_handler | |
3008 // | |
3009 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
3010 // | |
3011 | |
3012 static void resume_clear_context(OSThread *osthread) { | |
3013 osthread->set_ucontext(NULL); | |
3014 osthread->set_siginfo(NULL); | |
3015 } | |
3016 | |
3017 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
3018 osthread->set_ucontext(context); | |
3019 osthread->set_siginfo(siginfo); | |
3020 } | |
3021 | |
3022 // | |
3023 // Handler function invoked when a thread's execution is suspended or | |
3024 // resumed. We have to be careful that only async-safe functions are | |
3025 // called here (Note: most pthread functions are not async safe and | |
3026 // should be avoided.) | |
3027 // | |
3028 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
3029 // interface point of view, but sigwait() prevents the signal hander | |
3030 // from being run. libpthread would get very confused by not having | |
3031 // its signal handlers run and prevents sigwait()'s use with the | |
3032 // mutex granting granting signal. | |
3033 // | |
3034 // Currently only ever called on the VMThread and JavaThreads (PC sampling). | |
3035 // | |
3036 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
3037 // Save and restore errno to avoid confusing native code with EINTR | |
3038 // after sigsuspend. | |
3039 int old_errno = errno; | |
3040 | |
3041 Thread* thread = Thread::current(); | |
3042 OSThread* osthread = thread->osthread(); | |
3043 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); | |
3044 | |
3045 os::SuspendResume::State current = osthread->sr.state(); | |
3046 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
3047 suspend_save_context(osthread, siginfo, context); | |
3048 | |
3049 // attempt to switch the state, we assume we had a SUSPEND_REQUEST | |
3050 os::SuspendResume::State state = osthread->sr.suspended(); | |
3051 if (state == os::SuspendResume::SR_SUSPENDED) { | |
3052 sigset_t suspend_set; // signals for sigsuspend() | |
3053 | |
3054 // get current set of blocked signals and unblock resume signal | |
3055 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
3056 sigdelset(&suspend_set, SR_signum); | |
3057 | |
3058 // wait here until we are resumed | |
3059 while (1) { | |
3060 sigsuspend(&suspend_set); | |
3061 | |
3062 os::SuspendResume::State result = osthread->sr.running(); | |
3063 if (result == os::SuspendResume::SR_RUNNING) { | |
3064 break; | |
3065 } | |
3066 } | |
3067 | |
3068 } else if (state == os::SuspendResume::SR_RUNNING) { | |
3069 // request was cancelled, continue | |
3070 } else { | |
3071 ShouldNotReachHere(); | |
3072 } | |
3073 | |
3074 resume_clear_context(osthread); | |
3075 } else if (current == os::SuspendResume::SR_RUNNING) { | |
3076 // request was cancelled, continue | |
3077 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
3078 // ignore | |
3079 } else { | |
3080 ShouldNotReachHere(); | |
3081 } | |
3082 | |
3083 errno = old_errno; | |
3084 } | |
3085 | |
3086 | |
3087 static int SR_initialize() { | |
3088 struct sigaction act; | |
3089 char *s; | |
3090 // Get signal number to use for suspend/resume | |
3091 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
3092 int sig = ::strtol(s, 0, 10); | |
3093 if (sig > 0 || sig < NSIG) { | |
3094 SR_signum = sig; | |
3095 } | |
3096 } | |
3097 | |
3098 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
3099 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
3100 | |
3101 sigemptyset(&SR_sigset); | |
3102 sigaddset(&SR_sigset, SR_signum); | |
3103 | |
3104 // Set up signal handler for suspend/resume. | |
3105 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
3106 act.sa_handler = (void (*)(int)) SR_handler; | |
3107 | |
3108 // SR_signum is blocked by default. | |
3109 // 4528190 - We also need to block pthread restart signal (32 on all | |
3110 // supported Linux platforms). Note that LinuxThreads need to block | |
3111 // this signal for all threads to work properly. So we don't have | |
3112 // to use hard-coded signal number when setting up the mask. | |
3113 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
3114 | |
3115 if (sigaction(SR_signum, &act, 0) == -1) { | |
3116 return -1; | |
3117 } | |
3118 | |
3119 // Save signal flag | |
3120 os::Aix::set_our_sigflags(SR_signum, act.sa_flags); | |
3121 return 0; | |
3122 } | |
3123 | |
3124 static int SR_finalize() { | |
3125 return 0; | |
3126 } | |
3127 | |
3128 static int sr_notify(OSThread* osthread) { | |
3129 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
3130 assert_status(status == 0, status, "pthread_kill"); | |
3131 return status; | |
3132 } | |
3133 | |
3134 // "Randomly" selected value for how long we want to spin | |
3135 // before bailing out on suspending a thread, also how often | |
3136 // we send a signal to a thread we want to resume | |
3137 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
3138 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
3139 | |
3140 // returns true on success and false on error - really an error is fatal | |
3141 // but this seems the normal response to library errors | |
3142 static bool do_suspend(OSThread* osthread) { | |
3143 assert(osthread->sr.is_running(), "thread should be running"); | |
3144 // mark as suspended and send signal | |
3145 | |
3146 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { | |
3147 // failed to switch, state wasn't running? | |
3148 ShouldNotReachHere(); | |
3149 return false; | |
3150 } | |
3151 | |
3152 if (sr_notify(osthread) != 0) { | |
3153 // try to cancel, switch to running | |
3154 | |
3155 os::SuspendResume::State result = osthread->sr.cancel_suspend(); | |
3156 if (result == os::SuspendResume::SR_RUNNING) { | |
3157 // cancelled | |
3158 return false; | |
3159 } else if (result == os::SuspendResume::SR_SUSPENDED) { | |
3160 // somehow managed to suspend | |
3161 return true; | |
3162 } else { | |
3163 ShouldNotReachHere(); | |
3164 return false; | |
3165 } | |
3166 } | |
3167 | |
3168 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
3169 | |
3170 for (int n = 0; !osthread->sr.is_suspended(); n++) { | |
3171 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) { | |
3172 os::yield_all(i); | |
3173 } | |
3174 | |
3175 // timeout, try to cancel the request | |
3176 if (n >= RANDOMLY_LARGE_INTEGER) { | |
3177 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
3178 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
3179 return false; | |
3180 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
3181 return true; | |
3182 } else { | |
3183 ShouldNotReachHere(); | |
3184 return false; | |
3185 } | |
3186 } | |
3187 } | |
3188 | |
3189 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
3190 return true; | |
3191 } | |
3192 | |
3193 static void do_resume(OSThread* osthread) { | |
3194 //assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
3195 | |
3196 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
3197 // failed to switch to WAKEUP_REQUEST | |
3198 ShouldNotReachHere(); | |
3199 return; | |
3200 } | |
3201 | |
3202 while (!osthread->sr.is_running()) { | |
3203 if (sr_notify(osthread) == 0) { | |
3204 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) { | |
3205 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) { | |
3206 os::yield_all(i); | |
3207 } | |
3208 } | |
3209 } else { | |
3210 ShouldNotReachHere(); | |
3211 } | |
3212 } | |
3213 | |
3214 guarantee(osthread->sr.is_running(), "Must be running!"); | |
3215 } | |
3216 | |
3217 //////////////////////////////////////////////////////////////////////////////// | |
3218 // interrupt support | |
3219 | |
3220 void os::interrupt(Thread* thread) { | |
3221 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3222 "possibility of dangling Thread pointer"); | |
3223 | |
3224 OSThread* osthread = thread->osthread(); | |
3225 | |
3226 if (!osthread->interrupted()) { | |
3227 osthread->set_interrupted(true); | |
3228 // More than one thread can get here with the same value of osthread, | |
3229 // resulting in multiple notifications. We do, however, want the store | |
3230 // to interrupted() to be visible to other threads before we execute unpark(). | |
3231 OrderAccess::fence(); | |
3232 ParkEvent * const slp = thread->_SleepEvent; | |
3233 if (slp != NULL) slp->unpark(); | |
3234 } | |
3235 | |
3236 // For JSR166. Unpark even if interrupt status already was set | |
3237 if (thread->is_Java_thread()) | |
3238 ((JavaThread*)thread)->parker()->unpark(); | |
3239 | |
3240 ParkEvent * ev = thread->_ParkEvent; | |
3241 if (ev != NULL) ev->unpark(); | |
3242 | |
3243 } | |
3244 | |
3245 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
3246 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3247 "possibility of dangling Thread pointer"); | |
3248 | |
3249 OSThread* osthread = thread->osthread(); | |
3250 | |
3251 bool interrupted = osthread->interrupted(); | |
3252 | |
3253 if (interrupted && clear_interrupted) { | |
3254 osthread->set_interrupted(false); | |
3255 // consider thread->_SleepEvent->reset() ... optional optimization | |
3256 } | |
3257 | |
3258 return interrupted; | |
3259 } | |
3260 | |
3261 /////////////////////////////////////////////////////////////////////////////////// | |
3262 // signal handling (except suspend/resume) | |
3263 | |
3264 // This routine may be used by user applications as a "hook" to catch signals. | |
3265 // The user-defined signal handler must pass unrecognized signals to this | |
3266 // routine, and if it returns true (non-zero), then the signal handler must | |
3267 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
3268 // routine will never retun false (zero), but instead will execute a VM panic | |
3269 // routine kill the process. | |
3270 // | |
3271 // If this routine returns false, it is OK to call it again. This allows | |
3272 // the user-defined signal handler to perform checks either before or after | |
3273 // the VM performs its own checks. Naturally, the user code would be making | |
3274 // a serious error if it tried to handle an exception (such as a null check | |
3275 // or breakpoint) that the VM was generating for its own correct operation. | |
3276 // | |
3277 // This routine may recognize any of the following kinds of signals: | |
3278 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3279 // It should be consulted by handlers for any of those signals. | |
3280 // | |
3281 // The caller of this routine must pass in the three arguments supplied | |
3282 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3283 // field of the structure passed to sigaction(). This routine assumes that | |
3284 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3285 // | |
3286 // Note that the VM will print warnings if it detects conflicting signal | |
3287 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3288 // | |
3289 extern "C" JNIEXPORT int | |
3290 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); | |
3291 | |
3292 // Set thread signal mask (for some reason on AIX sigthreadmask() seems | |
3293 // to be the thing to call; documentation is not terribly clear about whether | |
3294 // pthread_sigmask also works, and if it does, whether it does the same. | |
3295 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) { | |
3296 const int rc = ::pthread_sigmask(how, set, oset); | |
3297 // return value semantics differ slightly for error case: | |
3298 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno | |
3299 // (so, pthread_sigmask is more theadsafe for error handling) | |
3300 // But success is always 0. | |
3301 return rc == 0 ? true : false; | |
3302 } | |
3303 | |
3304 // Function to unblock all signals which are, according | |
3305 // to POSIX, typical program error signals. If they happen while being blocked, | |
3306 // they typically will bring down the process immediately. | |
3307 bool unblock_program_error_signals() { | |
3308 sigset_t set; | |
3309 ::sigemptyset(&set); | |
3310 ::sigaddset(&set, SIGILL); | |
3311 ::sigaddset(&set, SIGBUS); | |
3312 ::sigaddset(&set, SIGFPE); | |
3313 ::sigaddset(&set, SIGSEGV); | |
3314 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL); | |
3315 } | |
3316 | |
3317 // Renamed from 'signalHandler' to avoid collision with other shared libs. | |
3318 void javaSignalHandler(int sig, siginfo_t* info, void* uc) { | |
3319 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
3320 | |
3321 // Never leave program error signals blocked; | |
3322 // on all our platforms they would bring down the process immediately when | |
3323 // getting raised while being blocked. | |
3324 unblock_program_error_signals(); | |
3325 | |
3326 JVM_handle_aix_signal(sig, info, uc, true); | |
3327 } | |
3328 | |
3329 | |
3330 // This boolean allows users to forward their own non-matching signals | |
3331 // to JVM_handle_aix_signal, harmlessly. | |
3332 bool os::Aix::signal_handlers_are_installed = false; | |
3333 | |
3334 // For signal-chaining | |
3335 struct sigaction os::Aix::sigact[MAXSIGNUM]; | |
3336 unsigned int os::Aix::sigs = 0; | |
3337 bool os::Aix::libjsig_is_loaded = false; | |
3338 typedef struct sigaction *(*get_signal_t)(int); | |
3339 get_signal_t os::Aix::get_signal_action = NULL; | |
3340 | |
3341 struct sigaction* os::Aix::get_chained_signal_action(int sig) { | |
3342 struct sigaction *actp = NULL; | |
3343 | |
3344 if (libjsig_is_loaded) { | |
3345 // Retrieve the old signal handler from libjsig | |
3346 actp = (*get_signal_action)(sig); | |
3347 } | |
3348 if (actp == NULL) { | |
3349 // Retrieve the preinstalled signal handler from jvm | |
3350 actp = get_preinstalled_handler(sig); | |
3351 } | |
3352 | |
3353 return actp; | |
3354 } | |
3355 | |
3356 static bool call_chained_handler(struct sigaction *actp, int sig, | |
3357 siginfo_t *siginfo, void *context) { | |
3358 Unimplemented(); | |
3359 return true; | |
3360 } | |
3361 | |
3362 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
3363 bool chained = false; | |
3364 // signal-chaining | |
3365 if (UseSignalChaining) { | |
3366 struct sigaction *actp = get_chained_signal_action(sig); | |
3367 if (actp != NULL) { | |
3368 chained = call_chained_handler(actp, sig, siginfo, context); | |
3369 } | |
3370 } | |
3371 return chained; | |
3372 } | |
3373 | |
3374 struct sigaction* os::Aix::get_preinstalled_handler(int sig) { | |
3375 if ((((unsigned int)1 << sig) & sigs) != 0) { | |
3376 return &sigact[sig]; | |
3377 } | |
3378 return NULL; | |
3379 } | |
3380 | |
3381 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
3382 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3383 sigact[sig] = oldAct; | |
3384 sigs |= (unsigned int)1 << sig; | |
3385 } | |
3386 | |
3387 // for diagnostic | |
3388 int os::Aix::sigflags[MAXSIGNUM]; | |
3389 | |
3390 int os::Aix::get_our_sigflags(int sig) { | |
3391 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3392 return sigflags[sig]; | |
3393 } | |
3394 | |
3395 void os::Aix::set_our_sigflags(int sig, int flags) { | |
3396 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3397 sigflags[sig] = flags; | |
3398 } | |
3399 | |
3400 void os::Aix::set_signal_handler(int sig, bool set_installed) { | |
3401 // Check for overwrite. | |
3402 struct sigaction oldAct; | |
3403 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
3404 | |
3405 void* oldhand = oldAct.sa_sigaction | |
3406 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3407 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3408 // Renamed 'signalHandler' to avoid collision with other shared libs. | |
3409 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
3410 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
3411 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) { | |
3412 if (AllowUserSignalHandlers || !set_installed) { | |
3413 // Do not overwrite; user takes responsibility to forward to us. | |
3414 return; | |
3415 } else if (UseSignalChaining) { | |
3416 // save the old handler in jvm | |
3417 save_preinstalled_handler(sig, oldAct); | |
3418 // libjsig also interposes the sigaction() call below and saves the | |
3419 // old sigaction on it own. | |
3420 } else { | |
3421 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
3422 "%#lx for signal %d.", (long)oldhand, sig)); | |
3423 } | |
3424 } | |
3425 | |
3426 struct sigaction sigAct; | |
3427 sigfillset(&(sigAct.sa_mask)); | |
3428 if (!set_installed) { | |
3429 sigAct.sa_handler = SIG_DFL; | |
3430 sigAct.sa_flags = SA_RESTART; | |
3431 } else { | |
3432 // Renamed 'signalHandler' to avoid collision with other shared libs. | |
3433 sigAct.sa_sigaction = javaSignalHandler; | |
3434 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3435 } | |
3436 // Save flags, which are set by ours | |
3437 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3438 sigflags[sig] = sigAct.sa_flags; | |
3439 | |
3440 int ret = sigaction(sig, &sigAct, &oldAct); | |
3441 assert(ret == 0, "check"); | |
3442 | |
3443 void* oldhand2 = oldAct.sa_sigaction | |
3444 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3445 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3446 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3447 } | |
3448 | |
3449 // install signal handlers for signals that HotSpot needs to | |
3450 // handle in order to support Java-level exception handling. | |
3451 void os::Aix::install_signal_handlers() { | |
3452 if (!signal_handlers_are_installed) { | |
3453 signal_handlers_are_installed = true; | |
3454 | |
3455 // signal-chaining | |
3456 typedef void (*signal_setting_t)(); | |
3457 signal_setting_t begin_signal_setting = NULL; | |
3458 signal_setting_t end_signal_setting = NULL; | |
3459 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3460 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3461 if (begin_signal_setting != NULL) { | |
3462 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3463 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3464 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3465 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3466 libjsig_is_loaded = true; | |
3467 assert(UseSignalChaining, "should enable signal-chaining"); | |
3468 } | |
3469 if (libjsig_is_loaded) { | |
3470 // Tell libjsig jvm is setting signal handlers | |
3471 (*begin_signal_setting)(); | |
3472 } | |
3473 | |
3474 set_signal_handler(SIGSEGV, true); | |
3475 set_signal_handler(SIGPIPE, true); | |
3476 set_signal_handler(SIGBUS, true); | |
3477 set_signal_handler(SIGILL, true); | |
3478 set_signal_handler(SIGFPE, true); | |
3479 set_signal_handler(SIGTRAP, true); | |
3480 set_signal_handler(SIGXFSZ, true); | |
3481 set_signal_handler(SIGDANGER, true); | |
3482 | |
3483 if (libjsig_is_loaded) { | |
3484 // Tell libjsig jvm finishes setting signal handlers | |
3485 (*end_signal_setting)(); | |
3486 } | |
3487 | |
3488 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3489 // and if UserSignalHandler is installed all bets are off. | |
3490 // Log that signal checking is off only if -verbose:jni is specified. | |
3491 if (CheckJNICalls) { | |
3492 if (libjsig_is_loaded) { | |
3493 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
3494 check_signals = false; | |
3495 } | |
3496 if (AllowUserSignalHandlers) { | |
3497 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
3498 check_signals = false; | |
3499 } | |
3500 // need to initialize check_signal_done | |
3501 ::sigemptyset(&check_signal_done); | |
3502 } | |
3503 } | |
3504 } | |
3505 | |
3506 static const char* get_signal_handler_name(address handler, | |
3507 char* buf, int buflen) { | |
3508 int offset; | |
3509 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3510 if (found) { | |
3511 // skip directory names | |
3512 const char *p1, *p2; | |
3513 p1 = buf; | |
3514 size_t len = strlen(os::file_separator()); | |
3515 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3516 // The way os::dll_address_to_library_name is implemented on Aix | |
3517 // right now, it always returns -1 for the offset which is not | |
3518 // terribly informative. | |
3519 // Will fix that. For now, omit the offset. | |
3520 jio_snprintf(buf, buflen, "%s", p1); | |
3521 } else { | |
3522 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3523 } | |
3524 return buf; | |
3525 } | |
3526 | |
3527 static void print_signal_handler(outputStream* st, int sig, | |
3528 char* buf, size_t buflen) { | |
3529 struct sigaction sa; | |
3530 sigaction(sig, NULL, &sa); | |
3531 | |
3532 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3533 | |
3534 address handler = (sa.sa_flags & SA_SIGINFO) | |
3535 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3536 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3537 | |
3538 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3539 st->print("SIG_DFL"); | |
3540 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3541 st->print("SIG_IGN"); | |
3542 } else { | |
3543 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3544 } | |
3545 | |
3546 // Print readable mask. | |
3547 st->print(", sa_mask[0]="); | |
3548 os::Posix::print_signal_set_short(st, &sa.sa_mask); | |
3549 | |
3550 address rh = VMError::get_resetted_sighandler(sig); | |
3551 // May be, handler was resetted by VMError? | |
3552 if (rh != NULL) { | |
3553 handler = rh; | |
3554 sa.sa_flags = VMError::get_resetted_sigflags(sig); | |
3555 } | |
3556 | |
3557 // Print textual representation of sa_flags. | |
3558 st->print(", sa_flags="); | |
3559 os::Posix::print_sa_flags(st, sa.sa_flags); | |
3560 | |
3561 // Check: is it our handler? | |
3562 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) || | |
3563 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3564 // It is our signal handler. | |
3565 // Check for flags, reset system-used one! | |
3566 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) { | |
3567 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3568 os::Aix::get_our_sigflags(sig)); | |
3569 } | |
3570 } | |
3571 st->cr(); | |
3572 } | |
3573 | |
3574 | |
3575 #define DO_SIGNAL_CHECK(sig) \ | |
3576 if (!sigismember(&check_signal_done, sig)) \ | |
3577 os::Aix::check_signal_handler(sig) | |
3578 | |
3579 // This method is a periodic task to check for misbehaving JNI applications | |
3580 // under CheckJNI, we can add any periodic checks here | |
3581 | |
3582 void os::run_periodic_checks() { | |
3583 | |
3584 if (check_signals == false) return; | |
3585 | |
3586 // SEGV and BUS if overridden could potentially prevent | |
3587 // generation of hs*.log in the event of a crash, debugging | |
3588 // such a case can be very challenging, so we absolutely | |
3589 // check the following for a good measure: | |
3590 DO_SIGNAL_CHECK(SIGSEGV); | |
3591 DO_SIGNAL_CHECK(SIGILL); | |
3592 DO_SIGNAL_CHECK(SIGFPE); | |
3593 DO_SIGNAL_CHECK(SIGBUS); | |
3594 DO_SIGNAL_CHECK(SIGPIPE); | |
3595 DO_SIGNAL_CHECK(SIGXFSZ); | |
3596 if (UseSIGTRAP) { | |
3597 DO_SIGNAL_CHECK(SIGTRAP); | |
3598 } | |
3599 DO_SIGNAL_CHECK(SIGDANGER); | |
3600 | |
3601 // ReduceSignalUsage allows the user to override these handlers | |
3602 // see comments at the very top and jvm_solaris.h | |
3603 if (!ReduceSignalUsage) { | |
3604 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3605 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3606 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3607 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3608 } | |
3609 | |
3610 DO_SIGNAL_CHECK(SR_signum); | |
3611 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3612 } | |
3613 | |
3614 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3615 | |
3616 static os_sigaction_t os_sigaction = NULL; | |
3617 | |
3618 void os::Aix::check_signal_handler(int sig) { | |
3619 char buf[O_BUFLEN]; | |
3620 address jvmHandler = NULL; | |
3621 | |
3622 struct sigaction act; | |
3623 if (os_sigaction == NULL) { | |
3624 // only trust the default sigaction, in case it has been interposed | |
3625 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3626 if (os_sigaction == NULL) return; | |
3627 } | |
3628 | |
3629 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3630 | |
3631 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3632 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3633 : CAST_FROM_FN_PTR(address, act.sa_handler); | |
3634 | |
3635 | |
3636 switch(sig) { | |
3637 case SIGSEGV: | |
3638 case SIGBUS: | |
3639 case SIGFPE: | |
3640 case SIGPIPE: | |
3641 case SIGILL: | |
3642 case SIGXFSZ: | |
3643 // Renamed 'signalHandler' to avoid collision with other shared libs. | |
3644 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler); | |
3645 break; | |
3646 | |
3647 case SHUTDOWN1_SIGNAL: | |
3648 case SHUTDOWN2_SIGNAL: | |
3649 case SHUTDOWN3_SIGNAL: | |
3650 case BREAK_SIGNAL: | |
3651 jvmHandler = (address)user_handler(); | |
3652 break; | |
3653 | |
3654 case INTERRUPT_SIGNAL: | |
3655 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3656 break; | |
3657 | |
3658 default: | |
3659 if (sig == SR_signum) { | |
3660 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3661 } else { | |
3662 return; | |
3663 } | |
3664 break; | |
3665 } | |
3666 | |
3667 if (thisHandler != jvmHandler) { | |
3668 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3669 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3670 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3671 // No need to check this sig any longer | |
3672 sigaddset(&check_signal_done, sig); | |
3673 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) { | |
3674 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3675 tty->print("expected:" PTR32_FORMAT, os::Aix::get_our_sigflags(sig)); | |
3676 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3677 // No need to check this sig any longer | |
3678 sigaddset(&check_signal_done, sig); | |
3679 } | |
3680 | |
3681 // Dump all the signal | |
3682 if (sigismember(&check_signal_done, sig)) { | |
3683 print_signal_handlers(tty, buf, O_BUFLEN); | |
3684 } | |
3685 } | |
3686 | |
3687 extern bool signal_name(int signo, char* buf, size_t len); | |
3688 | |
3689 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3690 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3691 // signal | |
3692 if (!signal_name(exception_code, buf, size)) { | |
3693 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3694 } | |
3695 return buf; | |
3696 } else { | |
3697 return NULL; | |
3698 } | |
3699 } | |
3700 | |
3701 // To install functions for atexit system call | |
3702 extern "C" { | |
3703 static void perfMemory_exit_helper() { | |
3704 perfMemory_exit(); | |
3705 } | |
3706 } | |
3707 | |
3708 // This is called _before_ the most of global arguments have been parsed. | |
3709 void os::init(void) { | |
3710 // This is basic, we want to know if that ever changes. | |
3711 // (shared memory boundary is supposed to be a 256M aligned) | |
3712 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); | |
3713 | |
3714 // First off, we need to know whether we run on AIX or PASE, and | |
3715 // the OS level we run on. | |
3716 os::Aix::initialize_os_info(); | |
3717 | |
3718 // Scan environment (SPEC1170 behaviour, etc) | |
3719 os::Aix::scan_environment(); | |
3720 | |
3721 // Check which pages are supported by AIX. | |
3722 os::Aix::query_multipage_support(); | |
3723 | |
3724 // Next, we need to initialize libo4 and libperfstat libraries. | |
3725 if (os::Aix::on_pase()) { | |
3726 os::Aix::initialize_libo4(); | |
3727 } else { | |
3728 os::Aix::initialize_libperfstat(); | |
3729 } | |
3730 | |
3731 // Reset the perfstat information provided by ODM. | |
3732 if (os::Aix::on_aix()) { | |
3733 libperfstat::perfstat_reset(); | |
3734 } | |
3735 | |
3736 // Now initialze basic system properties. Note that for some of the values we | |
3737 // need libperfstat etc. | |
3738 os::Aix::initialize_system_info(); | |
3739 | |
3740 // Initialize large page support. | |
3741 if (UseLargePages) { | |
3742 os::large_page_init(); | |
3743 if (!UseLargePages) { | |
3744 // initialize os::_page_sizes | |
3745 _page_sizes[0] = Aix::page_size(); | |
3746 _page_sizes[1] = 0; | |
3747 if (Verbose) { | |
3748 fprintf(stderr, "Large Page initialization failed: setting UseLargePages=0.\n"); | |
3749 } | |
3750 } | |
3751 } else { | |
3752 // initialize os::_page_sizes | |
3753 _page_sizes[0] = Aix::page_size(); | |
3754 _page_sizes[1] = 0; | |
3755 } | |
3756 | |
3757 // debug trace | |
3758 if (Verbose) { | |
3759 fprintf(stderr, "os::vm_page_size 0x%llX\n", os::vm_page_size()); | |
3760 fprintf(stderr, "os::large_page_size 0x%llX\n", os::large_page_size()); | |
3761 fprintf(stderr, "os::_page_sizes = ( "); | |
3762 for (int i = 0; _page_sizes[i]; i ++) { | |
3763 fprintf(stderr, " %s ", describe_pagesize(_page_sizes[i])); | |
3764 } | |
3765 fprintf(stderr, ")\n"); | |
3766 } | |
3767 | |
3768 _initial_pid = getpid(); | |
3769 | |
3770 clock_tics_per_sec = sysconf(_SC_CLK_TCK); | |
3771 | |
3772 init_random(1234567); | |
3773 | |
3774 ThreadCritical::initialize(); | |
3775 | |
3776 // Main_thread points to the aboriginal thread. | |
3777 Aix::_main_thread = pthread_self(); | |
3778 | |
3779 initial_time_count = os::elapsed_counter(); | |
3780 pthread_mutex_init(&dl_mutex, NULL); | |
3781 } | |
3782 | |
3783 // this is called _after_ the global arguments have been parsed | |
3784 jint os::init_2(void) { | |
3785 | |
3786 if (Verbose) { | |
3787 fprintf(stderr, "processor count: %d\n", os::_processor_count); | |
3788 fprintf(stderr, "physical memory: %lu\n", Aix::_physical_memory); | |
3789 } | |
3790 | |
3791 // initially build up the loaded dll map | |
3792 LoadedLibraries::reload(); | |
3793 | |
3794 const int page_size = Aix::page_size(); | |
3795 const int map_size = page_size; | |
3796 | |
3797 address map_address = (address) MAP_FAILED; | |
3798 const int prot = PROT_READ; | |
3799 const int flags = MAP_PRIVATE|MAP_ANONYMOUS; | |
3800 | |
3801 // use optimized addresses for the polling page, | |
3802 // e.g. map it to a special 32-bit address. | |
3803 if (OptimizePollingPageLocation) { | |
3804 // architecture-specific list of address wishes: | |
3805 address address_wishes[] = { | |
3806 // AIX: addresses lower than 0x30000000 don't seem to work on AIX. | |
3807 // PPC64: all address wishes are non-negative 32 bit values where | |
3808 // the lower 16 bits are all zero. we can load these addresses | |
3809 // with a single ppc_lis instruction. | |
3810 (address) 0x30000000, (address) 0x31000000, | |
3811 (address) 0x32000000, (address) 0x33000000, | |
3812 (address) 0x40000000, (address) 0x41000000, | |
3813 (address) 0x42000000, (address) 0x43000000, | |
3814 (address) 0x50000000, (address) 0x51000000, | |
3815 (address) 0x52000000, (address) 0x53000000, | |
3816 (address) 0x60000000, (address) 0x61000000, | |
3817 (address) 0x62000000, (address) 0x63000000 | |
3818 }; | |
3819 int address_wishes_length = sizeof(address_wishes)/sizeof(address); | |
3820 | |
3821 // iterate over the list of address wishes: | |
3822 for (int i=0; i<address_wishes_length; i++) { | |
3823 // try to map with current address wish. | |
3824 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will | |
3825 // fail if the address is already mapped. | |
3826 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size, | |
3827 map_size, prot, | |
3828 flags | MAP_FIXED, | |
3829 -1, 0); | |
3830 if (Verbose) { | |
3831 fprintf(stderr, "SafePoint Polling Page address: %p (wish) => %p\n", | |
3832 address_wishes[i], map_address + (ssize_t)page_size); | |
3833 } | |
3834 | |
3835 if (map_address + (ssize_t)page_size == address_wishes[i]) { | |
3836 // map succeeded and map_address is at wished address, exit loop. | |
3837 break; | |
3838 } | |
3839 | |
3840 if (map_address != (address) MAP_FAILED) { | |
3841 // map succeeded, but polling_page is not at wished address, unmap and continue. | |
3842 ::munmap(map_address, map_size); | |
3843 map_address = (address) MAP_FAILED; | |
3844 } | |
3845 // map failed, continue loop. | |
3846 } | |
3847 } // end OptimizePollingPageLocation | |
3848 | |
3849 if (map_address == (address) MAP_FAILED) { | |
3850 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0); | |
3851 } | |
3852 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page"); | |
3853 os::set_polling_page(map_address); | |
3854 | |
3855 if (!UseMembar) { | |
3856 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3857 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
3858 os::set_memory_serialize_page(mem_serialize_page); | |
3859 | |
3860 #ifndef PRODUCT | |
3861 if (Verbose && PrintMiscellaneous) | |
3862 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
3863 #endif | |
3864 } | |
3865 | |
3866 // initialize suspend/resume support - must do this before signal_sets_init() | |
3867 if (SR_initialize() != 0) { | |
3868 perror("SR_initialize failed"); | |
3869 return JNI_ERR; | |
3870 } | |
3871 | |
3872 Aix::signal_sets_init(); | |
3873 Aix::install_signal_handlers(); | |
3874 | |
3875 // Check minimum allowable stack size for thread creation and to initialize | |
3876 // the java system classes, including StackOverflowError - depends on page | |
3877 // size. Add a page for compiler2 recursion in main thread. | |
3878 // Add in 2*BytesPerWord times page size to account for VM stack during | |
3879 // class initialization depending on 32 or 64 bit VM. | |
3880 os::Aix::min_stack_allowed = MAX2(os::Aix::min_stack_allowed, | |
3881 (size_t)(StackYellowPages+StackRedPages+StackShadowPages + | |
3882 2*BytesPerWord COMPILER2_PRESENT(+1)) * Aix::page_size()); | |
3883 | |
3884 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
3885 if (threadStackSizeInBytes != 0 && | |
3886 threadStackSizeInBytes < os::Aix::min_stack_allowed) { | |
3887 tty->print_cr("\nThe stack size specified is too small, " | |
3888 "Specify at least %dk", | |
3889 os::Aix::min_stack_allowed / K); | |
3890 return JNI_ERR; | |
3891 } | |
3892 | |
3893 // Make the stack size a multiple of the page size so that | |
3894 // the yellow/red zones can be guarded. | |
3895 // note that this can be 0, if no default stacksize was set | |
3896 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, vm_page_size())); | |
3897 | |
3898 Aix::libpthread_init(); | |
3899 | |
3900 if (MaxFDLimit) { | |
3901 // set the number of file descriptors to max. print out error | |
3902 // if getrlimit/setrlimit fails but continue regardless. | |
3903 struct rlimit nbr_files; | |
3904 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
3905 if (status != 0) { | |
3906 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3907 perror("os::init_2 getrlimit failed"); | |
3908 } else { | |
3909 nbr_files.rlim_cur = nbr_files.rlim_max; | |
3910 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
3911 if (status != 0) { | |
3912 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3913 perror("os::init_2 setrlimit failed"); | |
3914 } | |
3915 } | |
3916 } | |
3917 | |
3918 if (PerfAllowAtExitRegistration) { | |
3919 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
3920 // atexit functions can be delayed until process exit time, which | |
3921 // can be problematic for embedded VM situations. Embedded VMs should | |
3922 // call DestroyJavaVM() to assure that VM resources are released. | |
3923 | |
3924 // note: perfMemory_exit_helper atexit function may be removed in | |
3925 // the future if the appropriate cleanup code can be added to the | |
3926 // VM_Exit VMOperation's doit method. | |
3927 if (atexit(perfMemory_exit_helper) != 0) { | |
3928 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); | |
3929 } | |
3930 } | |
3931 | |
3932 return JNI_OK; | |
3933 } | |
3934 | |
3935 // this is called at the end of vm_initialization | |
3936 void os::init_3(void) { | |
3937 return; | |
3938 } | |
3939 | |
3940 // Mark the polling page as unreadable | |
3941 void os::make_polling_page_unreadable(void) { | |
3942 if (!guard_memory((char*)_polling_page, Aix::page_size())) { | |
3943 fatal("Could not disable polling page"); | |
3944 } | |
3945 }; | |
3946 | |
3947 // Mark the polling page as readable | |
3948 void os::make_polling_page_readable(void) { | |
3949 // Changed according to os_linux.cpp. | |
3950 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) { | |
3951 fatal(err_msg("Could not enable polling page at " PTR_FORMAT, _polling_page)); | |
3952 } | |
3953 }; | |
3954 | |
3955 int os::active_processor_count() { | |
3956 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
3957 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
3958 return online_cpus; | |
3959 } | |
3960 | |
3961 void os::set_native_thread_name(const char *name) { | |
3962 // Not yet implemented. | |
3963 return; | |
3964 } | |
3965 | |
3966 bool os::distribute_processes(uint length, uint* distribution) { | |
3967 // Not yet implemented. | |
3968 return false; | |
3969 } | |
3970 | |
3971 bool os::bind_to_processor(uint processor_id) { | |
3972 // Not yet implemented. | |
3973 return false; | |
3974 } | |
3975 | |
3976 void os::SuspendedThreadTask::internal_do_task() { | |
3977 if (do_suspend(_thread->osthread())) { | |
3978 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
3979 do_task(context); | |
3980 do_resume(_thread->osthread()); | |
3981 } | |
3982 } | |
3983 | |
3984 class PcFetcher : public os::SuspendedThreadTask { | |
3985 public: | |
3986 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
3987 ExtendedPC result(); | |
3988 protected: | |
3989 void do_task(const os::SuspendedThreadTaskContext& context); | |
3990 private: | |
3991 ExtendedPC _epc; | |
3992 }; | |
3993 | |
3994 ExtendedPC PcFetcher::result() { | |
3995 guarantee(is_done(), "task is not done yet."); | |
3996 return _epc; | |
3997 } | |
3998 | |
3999 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
4000 Thread* thread = context.thread(); | |
4001 OSThread* osthread = thread->osthread(); | |
4002 if (osthread->ucontext() != NULL) { | |
4003 _epc = os::Aix::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
4004 } else { | |
4005 // NULL context is unexpected, double-check this is the VMThread. | |
4006 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
4007 } | |
4008 } | |
4009 | |
4010 // Suspends the target using the signal mechanism and then grabs the PC before | |
4011 // resuming the target. Used by the flat-profiler only | |
4012 ExtendedPC os::get_thread_pc(Thread* thread) { | |
4013 // Make sure that it is called by the watcher for the VMThread. | |
4014 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
4015 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
4016 | |
4017 PcFetcher fetcher(thread); | |
4018 fetcher.run(); | |
4019 return fetcher.result(); | |
4020 } | |
4021 | |
4022 // Not neede on Aix. | |
4023 // int os::Aix::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) { | |
4024 // } | |
4025 | |
4026 //////////////////////////////////////////////////////////////////////////////// | |
4027 // debug support | |
4028 | |
4029 static address same_page(address x, address y) { | |
4030 intptr_t page_bits = -os::vm_page_size(); | |
4031 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) | |
4032 return x; | |
4033 else if (x > y) | |
4034 return (address)(intptr_t(y) | ~page_bits) + 1; | |
4035 else | |
4036 return (address)(intptr_t(y) & page_bits); | |
4037 } | |
4038 | |
4039 bool os::find(address addr, outputStream* st) { | |
4040 Unimplemented(); | |
4041 return false; | |
4042 } | |
4043 | |
4044 //////////////////////////////////////////////////////////////////////////////// | |
4045 // misc | |
4046 | |
4047 // This does not do anything on Aix. This is basically a hook for being | |
4048 // able to use structured exception handling (thread-local exception filters) | |
4049 // on, e.g., Win32. | |
4050 void | |
4051 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
4052 JavaCallArguments* args, Thread* thread) { | |
4053 f(value, method, args, thread); | |
4054 } | |
4055 | |
4056 void os::print_statistics() { | |
4057 } | |
4058 | |
4059 int os::message_box(const char* title, const char* message) { | |
4060 int i; | |
4061 fdStream err(defaultStream::error_fd()); | |
4062 for (i = 0; i < 78; i++) err.print_raw("="); | |
4063 err.cr(); | |
4064 err.print_raw_cr(title); | |
4065 for (i = 0; i < 78; i++) err.print_raw("-"); | |
4066 err.cr(); | |
4067 err.print_raw_cr(message); | |
4068 for (i = 0; i < 78; i++) err.print_raw("="); | |
4069 err.cr(); | |
4070 | |
4071 char buf[16]; | |
4072 // Prevent process from exiting upon "read error" without consuming all CPU | |
4073 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
4074 | |
4075 return buf[0] == 'y' || buf[0] == 'Y'; | |
4076 } | |
4077 | |
4078 int os::stat(const char *path, struct stat *sbuf) { | |
4079 char pathbuf[MAX_PATH]; | |
4080 if (strlen(path) > MAX_PATH - 1) { | |
4081 errno = ENAMETOOLONG; | |
4082 return -1; | |
4083 } | |
4084 os::native_path(strcpy(pathbuf, path)); | |
4085 return ::stat(pathbuf, sbuf); | |
4086 } | |
4087 | |
4088 bool os::check_heap(bool force) { | |
4089 return true; | |
4090 } | |
4091 | |
4092 // int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
4093 // return ::vsnprintf(buf, count, format, args); | |
4094 // } | |
4095 | |
4096 // Is a (classpath) directory empty? | |
4097 bool os::dir_is_empty(const char* path) { | |
4098 Unimplemented(); | |
4099 return false; | |
4100 } | |
4101 | |
4102 // This code originates from JDK's sysOpen and open64_w | |
4103 // from src/solaris/hpi/src/system_md.c | |
4104 | |
4105 #ifndef O_DELETE | |
4106 #define O_DELETE 0x10000 | |
4107 #endif | |
4108 | |
4109 // Open a file. Unlink the file immediately after open returns | |
4110 // if the specified oflag has the O_DELETE flag set. | |
4111 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
4112 | |
4113 int os::open(const char *path, int oflag, int mode) { | |
4114 | |
4115 if (strlen(path) > MAX_PATH - 1) { | |
4116 errno = ENAMETOOLONG; | |
4117 return -1; | |
4118 } | |
4119 int fd; | |
4120 int o_delete = (oflag & O_DELETE); | |
4121 oflag = oflag & ~O_DELETE; | |
4122 | |
4123 fd = ::open64(path, oflag, mode); | |
4124 if (fd == -1) return -1; | |
4125 | |
4126 //If the open succeeded, the file might still be a directory | |
4127 { | |
4128 struct stat64 buf64; | |
4129 int ret = ::fstat64(fd, &buf64); | |
4130 int st_mode = buf64.st_mode; | |
4131 | |
4132 if (ret != -1) { | |
4133 if ((st_mode & S_IFMT) == S_IFDIR) { | |
4134 errno = EISDIR; | |
4135 ::close(fd); | |
4136 return -1; | |
4137 } | |
4138 } else { | |
4139 ::close(fd); | |
4140 return -1; | |
4141 } | |
4142 } | |
4143 | |
4144 // All file descriptors that are opened in the JVM and not | |
4145 // specifically destined for a subprocess should have the | |
4146 // close-on-exec flag set. If we don't set it, then careless 3rd | |
4147 // party native code might fork and exec without closing all | |
4148 // appropriate file descriptors (e.g. as we do in closeDescriptors in | |
4149 // UNIXProcess.c), and this in turn might: | |
4150 // | |
4151 // - cause end-of-file to fail to be detected on some file | |
4152 // descriptors, resulting in mysterious hangs, or | |
4153 // | |
4154 // - might cause an fopen in the subprocess to fail on a system | |
4155 // suffering from bug 1085341. | |
4156 // | |
4157 // (Yes, the default setting of the close-on-exec flag is a Unix | |
4158 // design flaw.) | |
4159 // | |
4160 // See: | |
4161 // 1085341: 32-bit stdio routines should support file descriptors >255 | |
4162 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
4163 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
4164 #ifdef FD_CLOEXEC | |
4165 { | |
4166 int flags = ::fcntl(fd, F_GETFD); | |
4167 if (flags != -1) | |
4168 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
4169 } | |
4170 #endif | |
4171 | |
4172 if (o_delete != 0) { | |
4173 ::unlink(path); | |
4174 } | |
4175 return fd; | |
4176 } | |
4177 | |
4178 | |
4179 // create binary file, rewriting existing file if required | |
4180 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
4181 Unimplemented(); | |
4182 return 0; | |
4183 } | |
4184 | |
4185 // return current position of file pointer | |
4186 jlong os::current_file_offset(int fd) { | |
4187 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); | |
4188 } | |
4189 | |
4190 // move file pointer to the specified offset | |
4191 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
4192 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); | |
4193 } | |
4194 | |
4195 // This code originates from JDK's sysAvailable | |
4196 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
4197 | |
4198 int os::available(int fd, jlong *bytes) { | |
4199 jlong cur, end; | |
4200 int mode; | |
4201 struct stat64 buf64; | |
4202 | |
4203 if (::fstat64(fd, &buf64) >= 0) { | |
4204 mode = buf64.st_mode; | |
4205 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
4206 // XXX: is the following call interruptible? If so, this might | |
4207 // need to go through the INTERRUPT_IO() wrapper as for other | |
4208 // blocking, interruptible calls in this file. | |
4209 int n; | |
4210 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
4211 *bytes = n; | |
4212 return 1; | |
4213 } | |
4214 } | |
4215 } | |
4216 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { | |
4217 return 0; | |
4218 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { | |
4219 return 0; | |
4220 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { | |
4221 return 0; | |
4222 } | |
4223 *bytes = end - cur; | |
4224 return 1; | |
4225 } | |
4226 | |
4227 int os::socket_available(int fd, jint *pbytes) { | |
4228 // Linux doc says EINTR not returned, unlike Solaris | |
4229 int ret = ::ioctl(fd, FIONREAD, pbytes); | |
4230 | |
4231 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
4232 // is expected to return 0 on failure and 1 on success to the jdk. | |
4233 return (ret < 0) ? 0 : 1; | |
4234 } | |
4235 | |
4236 // Map a block of memory. | |
4237 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, | |
4238 char *addr, size_t bytes, bool read_only, | |
4239 bool allow_exec) { | |
4240 Unimplemented(); | |
4241 return NULL; | |
4242 } | |
4243 | |
4244 | |
4245 // Remap a block of memory. | |
4246 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, | |
4247 char *addr, size_t bytes, bool read_only, | |
4248 bool allow_exec) { | |
4249 // same as map_memory() on this OS | |
4250 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
4251 allow_exec); | |
4252 } | |
4253 | |
4254 // Unmap a block of memory. | |
4255 bool os::pd_unmap_memory(char* addr, size_t bytes) { | |
4256 return munmap(addr, bytes) == 0; | |
4257 } | |
4258 | |
4259 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
4260 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
4261 // of a thread. | |
4262 // | |
4263 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
4264 // the fast estimate available on the platform. | |
4265 | |
4266 jlong os::current_thread_cpu_time() { | |
4267 // return user + sys since the cost is the same | |
4268 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
4269 assert(n >= 0, "negative CPU time"); | |
4270 return n; | |
4271 } | |
4272 | |
4273 jlong os::thread_cpu_time(Thread* thread) { | |
4274 // consistent with what current_thread_cpu_time() returns | |
4275 const jlong n = os::thread_cpu_time(thread, true /* user + sys */); | |
4276 assert(n >= 0, "negative CPU time"); | |
4277 return n; | |
4278 } | |
4279 | |
4280 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
4281 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
4282 assert(n >= 0, "negative CPU time"); | |
4283 return n; | |
4284 } | |
4285 | |
4286 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { | |
4287 bool error = false; | |
4288 | |
4289 jlong sys_time = 0; | |
4290 jlong user_time = 0; | |
4291 | |
4292 // reimplemented using getthrds64(). | |
4293 // | |
4294 // goes like this: | |
4295 // For the thread in question, get the kernel thread id. Then get the | |
4296 // kernel thread statistics using that id. | |
4297 // | |
4298 // This only works of course when no pthread scheduling is used, | |
4299 // ie there is a 1:1 relationship to kernel threads. | |
4300 // On AIX, see AIXTHREAD_SCOPE variable. | |
4301 | |
4302 pthread_t pthtid = thread->osthread()->pthread_id(); | |
4303 | |
4304 // retrieve kernel thread id for the pthread: | |
4305 tid64_t tid = 0; | |
4306 struct __pthrdsinfo pinfo; | |
4307 // I just love those otherworldly IBM APIs which force me to hand down | |
4308 // dummy buffers for stuff I dont care for... | |
4309 char dummy[1]; | |
4310 int dummy_size = sizeof(dummy); | |
4311 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), | |
4312 dummy, &dummy_size) == 0) { | |
4313 tid = pinfo.__pi_tid; | |
4314 } else { | |
4315 tty->print_cr("pthread_getthrds_np failed."); | |
4316 error = true; | |
4317 } | |
4318 | |
4319 // retrieve kernel timing info for that kernel thread | |
4320 if (!error) { | |
4321 struct thrdentry64 thrdentry; | |
4322 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { | |
4323 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; | |
4324 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; | |
4325 } else { | |
4326 tty->print_cr("pthread_getthrds_np failed."); | |
4327 error = true; | |
4328 } | |
4329 } | |
4330 | |
4331 if (p_sys_time) { | |
4332 *p_sys_time = sys_time; | |
4333 } | |
4334 | |
4335 if (p_user_time) { | |
4336 *p_user_time = user_time; | |
4337 } | |
4338 | |
4339 if (error) { | |
4340 return false; | |
4341 } | |
4342 | |
4343 return true; | |
4344 } | |
4345 | |
4346 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4347 jlong sys_time; | |
4348 jlong user_time; | |
4349 | |
4350 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { | |
4351 return -1; | |
4352 } | |
4353 | |
4354 return user_sys_cpu_time ? sys_time + user_time : user_time; | |
4355 } | |
4356 | |
4357 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4358 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4359 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4360 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4361 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4362 } | |
4363 | |
4364 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4365 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4366 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4367 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4368 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4369 } | |
4370 | |
4371 bool os::is_thread_cpu_time_supported() { | |
4372 return true; | |
4373 } | |
4374 | |
4375 // System loadavg support. Returns -1 if load average cannot be obtained. | |
4376 // For now just return the system wide load average (no processor sets). | |
4377 int os::loadavg(double values[], int nelem) { | |
4378 | |
4379 // Implemented using libperfstat on AIX. | |
4380 | |
4381 guarantee(nelem >= 0 && nelem <= 3, "argument error"); | |
4382 guarantee(values, "argument error"); | |
4383 | |
4384 if (os::Aix::on_pase()) { | |
4385 Unimplemented(); | |
4386 return -1; | |
4387 } else { | |
4388 // AIX: use libperfstat | |
4389 // | |
4390 // See also: | |
4391 // http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_cputot.htm | |
4392 // /usr/include/libperfstat.h: | |
4393 | |
4394 // Use the already AIX version independent get_cpuinfo. | |
4395 os::Aix::cpuinfo_t ci; | |
4396 if (os::Aix::get_cpuinfo(&ci)) { | |
4397 for (int i = 0; i < nelem; i++) { | |
4398 values[i] = ci.loadavg[i]; | |
4399 } | |
4400 } else { | |
4401 return -1; | |
4402 } | |
4403 return nelem; | |
4404 } | |
4405 } | |
4406 | |
4407 void os::pause() { | |
4408 char filename[MAX_PATH]; | |
4409 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
4410 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
4411 } else { | |
4412 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
4413 } | |
4414 | |
4415 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
4416 if (fd != -1) { | |
4417 struct stat buf; | |
4418 ::close(fd); | |
4419 while (::stat(filename, &buf) == 0) { | |
4420 (void)::poll(NULL, 0, 100); | |
4421 } | |
4422 } else { | |
4423 jio_fprintf(stderr, | |
4424 "Could not open pause file '%s', continuing immediately.\n", filename); | |
4425 } | |
4426 } | |
4427 | |
4428 bool os::Aix::is_primordial_thread() { | |
4429 if (pthread_self() == (pthread_t)1) { | |
4430 return true; | |
4431 } else { | |
4432 return false; | |
4433 } | |
4434 } | |
4435 | |
4436 // OS recognitions (PASE/AIX, OS level) call this before calling any | |
4437 // one of Aix::on_pase(), Aix::os_version() static | |
4438 void os::Aix::initialize_os_info() { | |
4439 | |
4440 assert(_on_pase == -1 && _os_version == -1, "already called."); | |
4441 | |
4442 struct utsname uts; | |
4443 memset(&uts, 0, sizeof(uts)); | |
4444 strcpy(uts.sysname, "?"); | |
4445 if (::uname(&uts) == -1) { | |
4446 fprintf(stderr, "uname failed (%d)\n", errno); | |
4447 guarantee(0, "Could not determine whether we run on AIX or PASE"); | |
4448 } else { | |
4449 if (Verbose) { | |
4450 fprintf(stderr,"uname says: sysname \"%s\" version \"%s\" release \"%s\" " | |
4451 "node \"%s\" machine \"%s\"\n", | |
4452 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); | |
4453 } | |
4454 const int major = atoi(uts.version); | |
4455 assert(major > 0, "invalid OS version"); | |
4456 const int minor = atoi(uts.release); | |
4457 assert(minor > 0, "invalid OS release"); | |
4458 _os_version = (major << 8) | minor; | |
4459 if (strcmp(uts.sysname, "OS400") == 0) { | |
4460 Unimplemented(); | |
4461 } else if (strcmp(uts.sysname, "AIX") == 0) { | |
4462 // We run on AIX. We do not support versions older than AIX 5.3. | |
4463 _on_pase = 0; | |
4464 if (_os_version < 0x0503) { | |
4465 fprintf(stderr, "AIX release older than AIX 5.3 not supported.\n"); | |
4466 assert(false, "AIX release too old."); | |
4467 } else { | |
4468 if (Verbose) { | |
4469 fprintf(stderr, "We run on AIX %d.%d\n", major, minor); | |
4470 } | |
4471 } | |
4472 } else { | |
4473 assert(false, "unknown OS"); | |
4474 } | |
4475 } | |
4476 | |
4477 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release"); | |
4478 | |
4479 } // end: os::Aix::initialize_os_info() | |
4480 | |
4481 // Scan environment for important settings which might effect the VM. | |
4482 // Trace out settings. Warn about invalid settings and/or correct them. | |
4483 // | |
4484 // Must run after os::Aix::initialue_os_info(). | |
4485 void os::Aix::scan_environment() { | |
4486 | |
4487 char* p; | |
4488 int rc; | |
4489 | |
4490 // Warn explicity if EXTSHM=ON is used. That switch changes how | |
4491 // System V shared memory behaves. One effect is that page size of | |
4492 // shared memory cannot be change dynamically, effectivly preventing | |
4493 // large pages from working. | |
4494 // This switch was needed on AIX 32bit, but on AIX 64bit the general | |
4495 // recommendation is (in OSS notes) to switch it off. | |
4496 p = ::getenv("EXTSHM"); | |
4497 if (Verbose) { | |
4498 fprintf(stderr, "EXTSHM=%s.\n", p ? p : "<unset>"); | |
4499 } | |
4500 if (p && strcmp(p, "ON") == 0) { | |
4501 fprintf(stderr, "Unsupported setting: EXTSHM=ON. Large Page support will be disabled.\n"); | |
4502 _extshm = 1; | |
4503 } else { | |
4504 _extshm = 0; | |
4505 } | |
4506 | |
4507 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. | |
4508 // Not tested, not supported. | |
4509 // | |
4510 // Note that it might be worth the trouble to test and to require it, if only to | |
4511 // get useful return codes for mprotect. | |
4512 // | |
4513 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before | |
4514 // exec() ? before loading the libjvm ? ....) | |
4515 p = ::getenv("XPG_SUS_ENV"); | |
4516 if (Verbose) { | |
4517 fprintf(stderr, "XPG_SUS_ENV=%s.\n", p ? p : "<unset>"); | |
4518 } | |
4519 if (p && strcmp(p, "ON") == 0) { | |
4520 _xpg_sus_mode = 1; | |
4521 fprintf(stderr, "Unsupported setting: XPG_SUS_ENV=ON\n"); | |
4522 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to | |
4523 // clobber address ranges. If we ever want to support that, we have to do some | |
4524 // testing first. | |
4525 guarantee(false, "XPG_SUS_ENV=ON not supported"); | |
4526 } else { | |
4527 _xpg_sus_mode = 0; | |
4528 } | |
4529 | |
4530 // Switch off AIX internal (pthread) guard pages. This has | |
4531 // immediate effect for any pthread_create calls which follow. | |
4532 p = ::getenv("AIXTHREAD_GUARDPAGES"); | |
4533 if (Verbose) { | |
4534 fprintf(stderr, "AIXTHREAD_GUARDPAGES=%s.\n", p ? p : "<unset>"); | |
4535 fprintf(stderr, "setting AIXTHREAD_GUARDPAGES=0.\n"); | |
4536 } | |
4537 rc = ::putenv("AIXTHREAD_GUARDPAGES=0"); | |
4538 guarantee(rc == 0, ""); | |
4539 | |
4540 } // end: os::Aix::scan_environment() | |
4541 | |
4542 // PASE: initialize the libo4 library (AS400 PASE porting library). | |
4543 void os::Aix::initialize_libo4() { | |
4544 Unimplemented(); | |
4545 } | |
4546 | |
4547 // AIX: initialize the libperfstat library (we load this dynamically | |
4548 // because it is only available on AIX. | |
4549 void os::Aix::initialize_libperfstat() { | |
4550 | |
4551 assert(os::Aix::on_aix(), "AIX only"); | |
4552 | |
4553 if (!libperfstat::init()) { | |
4554 fprintf(stderr, "libperfstat initialization failed.\n"); | |
4555 assert(false, "libperfstat initialization failed"); | |
4556 } else { | |
4557 if (Verbose) { | |
4558 fprintf(stderr, "libperfstat initialized.\n"); | |
4559 } | |
4560 } | |
4561 } // end: os::Aix::initialize_libperfstat | |
4562 | |
4563 ///////////////////////////////////////////////////////////////////////////// | |
4564 // thread stack | |
4565 | |
4566 // function to query the current stack size using pthread_getthrds_np | |
4567 // | |
4568 // ! do not change anything here unless you know what you are doing ! | |
4569 static void query_stack_dimensions(address* p_stack_base, size_t* p_stack_size) { | |
4570 | |
4571 // This only works when invoked on a pthread. As we agreed not to use | |
4572 // primordial threads anyway, I assert here | |
4573 guarantee(!os::Aix::is_primordial_thread(), "not allowed on the primordial thread"); | |
4574 | |
4575 // information about this api can be found (a) in the pthread.h header and | |
4576 // (b) in http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_getthrds_np.htm | |
4577 // | |
4578 // The use of this API to find out the current stack is kind of undefined. | |
4579 // But after a lot of tries and asking IBM about it, I concluded that it is safe | |
4580 // enough for cases where I let the pthread library create its stacks. For cases | |
4581 // where I create an own stack and pass this to pthread_create, it seems not to | |
4582 // work (the returned stack size in that case is 0). | |
4583 | |
4584 pthread_t tid = pthread_self(); | |
4585 struct __pthrdsinfo pinfo; | |
4586 char dummy[1]; // we only need this to satisfy the api and to not get E | |
4587 int dummy_size = sizeof(dummy); | |
4588 | |
4589 memset(&pinfo, 0, sizeof(pinfo)); | |
4590 | |
4591 const int rc = pthread_getthrds_np (&tid, PTHRDSINFO_QUERY_ALL, &pinfo, | |
4592 sizeof(pinfo), dummy, &dummy_size); | |
4593 | |
4594 if (rc != 0) { | |
4595 fprintf(stderr, "pthread_getthrds_np failed (%d)\n", rc); | |
4596 guarantee(0, "pthread_getthrds_np failed"); | |
4597 } | |
4598 | |
4599 guarantee(pinfo.__pi_stackend, "returned stack base invalid"); | |
4600 | |
4601 // the following can happen when invoking pthread_getthrds_np on a pthread running on a user provided stack | |
4602 // (when handing down a stack to pthread create, see pthread_attr_setstackaddr). | |
4603 // Not sure what to do here - I feel inclined to forbid this use case completely. | |
4604 guarantee(pinfo.__pi_stacksize, "returned stack size invalid"); | |
4605 | |
4606 // On AIX, stacks are not necessarily page aligned so round the base and size accordingly | |
4607 if (p_stack_base) { | |
4608 (*p_stack_base) = (address) align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()); | |
4609 } | |
4610 | |
4611 if (p_stack_size) { | |
4612 (*p_stack_size) = pinfo.__pi_stacksize - os::Aix::stack_page_size(); | |
4613 } | |
4614 | |
4615 #ifndef PRODUCT | |
4616 if (Verbose) { | |
4617 fprintf(stderr, | |
4618 "query_stack_dimensions() -> real stack_base=" INTPTR_FORMAT ", real stack_addr=" INTPTR_FORMAT | |
4619 ", real stack_size=" INTPTR_FORMAT | |
4620 ", stack_base=" INTPTR_FORMAT ", stack_size=" INTPTR_FORMAT "\n", | |
4621 (intptr_t)pinfo.__pi_stackend, (intptr_t)pinfo.__pi_stackaddr, pinfo.__pi_stacksize, | |
4622 (intptr_t)align_size_up((intptr_t)pinfo.__pi_stackend, os::Aix::stack_page_size()), | |
4623 pinfo.__pi_stacksize - os::Aix::stack_page_size()); | |
4624 } | |
4625 #endif | |
4626 | |
4627 } // end query_stack_dimensions | |
4628 | |
4629 // get the current stack base from the OS (actually, the pthread library) | |
4630 address os::current_stack_base() { | |
4631 address p; | |
4632 query_stack_dimensions(&p, 0); | |
4633 return p; | |
4634 } | |
4635 | |
4636 // get the current stack size from the OS (actually, the pthread library) | |
4637 size_t os::current_stack_size() { | |
4638 size_t s; | |
4639 query_stack_dimensions(0, &s); | |
4640 return s; | |
4641 } | |
4642 | |
4643 // Refer to the comments in os_solaris.cpp park-unpark. | |
4644 // | |
4645 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
4646 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
4647 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
4648 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
4649 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
4650 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
4651 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
4652 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
4653 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
4654 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
4655 // of libpthread avoids the problem, but isn't practical. | |
4656 // | |
4657 // Possible remedies: | |
4658 // | |
4659 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
4660 // This is palliative and probabilistic, however. If the thread is preempted | |
4661 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
4662 // than the minimum period may have passed, and the abstime may be stale (in the | |
4663 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
4664 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
4665 // | |
4666 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4667 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4668 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4669 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4670 // thread. | |
4671 // | |
4672 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4673 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4674 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4675 // This also works well. In fact it avoids kernel-level scalability impediments | |
4676 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4677 // timers in a graceful fashion. | |
4678 // | |
4679 // 4. When the abstime value is in the past it appears that control returns | |
4680 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4681 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4682 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4683 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4684 // It may be possible to avoid reinitialization by checking the return | |
4685 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4686 // condvar we must establish the invariant that cond_signal() is only called | |
4687 // within critical sections protected by the adjunct mutex. This prevents | |
4688 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4689 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4690 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4691 // | |
4692 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4693 // structure when a condvar is used or initialized. cond_destroy() would | |
4694 // release the helper structure. Our reinitialize-after-timedwait fix | |
4695 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4696 // | |
4697 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4698 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4699 // and only enabling the work-around for vulnerable environments. | |
4700 | |
4701 // utility to compute the abstime argument to timedwait: | |
4702 // millis is the relative timeout time | |
4703 // abstime will be the absolute timeout time | |
4704 // TODO: replace compute_abstime() with unpackTime() | |
4705 | |
4706 static struct timespec* compute_abstime(timespec* abstime, jlong millis) { | |
4707 if (millis < 0) millis = 0; | |
4708 struct timeval now; | |
4709 int status = gettimeofday(&now, NULL); | |
4710 assert(status == 0, "gettimeofday"); | |
4711 jlong seconds = millis / 1000; | |
4712 millis %= 1000; | |
4713 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4714 seconds = 50000000; | |
4715 } | |
4716 abstime->tv_sec = now.tv_sec + seconds; | |
4717 long usec = now.tv_usec + millis * 1000; | |
4718 if (usec >= 1000000) { | |
4719 abstime->tv_sec += 1; | |
4720 usec -= 1000000; | |
4721 } | |
4722 abstime->tv_nsec = usec * 1000; | |
4723 return abstime; | |
4724 } | |
4725 | |
4726 | |
4727 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4728 // Conceptually TryPark() should be equivalent to park(0). | |
4729 | |
4730 int os::PlatformEvent::TryPark() { | |
4731 for (;;) { | |
4732 const int v = _Event; | |
4733 guarantee ((v == 0) || (v == 1), "invariant"); | |
4734 if (Atomic::cmpxchg (0, &_Event, v) == v) return v; | |
4735 } | |
4736 } | |
4737 | |
4738 void os::PlatformEvent::park() { // AKA "down()" | |
4739 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4740 // may call park(). | |
4741 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4742 int v; | |
4743 for (;;) { | |
4744 v = _Event; | |
4745 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break; | |
4746 } | |
4747 guarantee (v >= 0, "invariant"); | |
4748 if (v == 0) { | |
4749 // Do this the hard way by blocking ... | |
4750 int status = pthread_mutex_lock(_mutex); | |
4751 assert_status(status == 0, status, "mutex_lock"); | |
4752 guarantee (_nParked == 0, "invariant"); | |
4753 ++ _nParked; | |
4754 while (_Event < 0) { | |
4755 status = pthread_cond_wait(_cond, _mutex); | |
4756 assert_status(status == 0 || status == ETIMEDOUT, status, "cond_timedwait"); | |
4757 } | |
4758 -- _nParked; | |
4759 | |
4760 // In theory we could move the ST of 0 into _Event past the unlock(), | |
4761 // but then we'd need a MEMBAR after the ST. | |
4762 _Event = 0; | |
4763 status = pthread_mutex_unlock(_mutex); | |
4764 assert_status(status == 0, status, "mutex_unlock"); | |
4765 } | |
4766 guarantee (_Event >= 0, "invariant"); | |
4767 } | |
4768 | |
4769 int os::PlatformEvent::park(jlong millis) { | |
4770 guarantee (_nParked == 0, "invariant"); | |
4771 | |
4772 int v; | |
4773 for (;;) { | |
4774 v = _Event; | |
4775 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break; | |
4776 } | |
4777 guarantee (v >= 0, "invariant"); | |
4778 if (v != 0) return OS_OK; | |
4779 | |
4780 // We do this the hard way, by blocking the thread. | |
4781 // Consider enforcing a minimum timeout value. | |
4782 struct timespec abst; | |
4783 compute_abstime(&abst, millis); | |
4784 | |
4785 int ret = OS_TIMEOUT; | |
4786 int status = pthread_mutex_lock(_mutex); | |
4787 assert_status(status == 0, status, "mutex_lock"); | |
4788 guarantee (_nParked == 0, "invariant"); | |
4789 ++_nParked; | |
4790 | |
4791 // Object.wait(timo) will return because of | |
4792 // (a) notification | |
4793 // (b) timeout | |
4794 // (c) thread.interrupt | |
4795 // | |
4796 // Thread.interrupt and object.notify{All} both call Event::set. | |
4797 // That is, we treat thread.interrupt as a special case of notification. | |
4798 // The underlying Solaris implementation, cond_timedwait, admits | |
4799 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4800 // JVM from making those visible to Java code. As such, we must | |
4801 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4802 // | |
4803 // TODO: properly differentiate simultaneous notify+interrupt. | |
4804 // In that case, we should propagate the notify to another waiter. | |
4805 | |
4806 while (_Event < 0) { | |
4807 status = pthread_cond_timedwait(_cond, _mutex, &abst); | |
4808 assert_status(status == 0 || status == ETIMEDOUT, | |
4809 status, "cond_timedwait"); | |
4810 if (!FilterSpuriousWakeups) break; // previous semantics | |
4811 if (status == ETIMEDOUT) break; | |
4812 // We consume and ignore EINTR and spurious wakeups. | |
4813 } | |
4814 --_nParked; | |
4815 if (_Event >= 0) { | |
4816 ret = OS_OK; | |
4817 } | |
4818 _Event = 0; | |
4819 status = pthread_mutex_unlock(_mutex); | |
4820 assert_status(status == 0, status, "mutex_unlock"); | |
4821 assert (_nParked == 0, "invariant"); | |
4822 return ret; | |
4823 } | |
4824 | |
4825 void os::PlatformEvent::unpark() { | |
4826 int v, AnyWaiters; | |
4827 for (;;) { | |
4828 v = _Event; | |
4829 if (v > 0) { | |
4830 // The LD of _Event could have reordered or be satisfied | |
4831 // by a read-aside from this processor's write buffer. | |
4832 // To avoid problems execute a barrier and then | |
4833 // ratify the value. | |
4834 OrderAccess::fence(); | |
4835 if (_Event == v) return; | |
4836 continue; | |
4837 } | |
4838 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break; | |
4839 } | |
4840 if (v < 0) { | |
4841 // Wait for the thread associated with the event to vacate | |
4842 int status = pthread_mutex_lock(_mutex); | |
4843 assert_status(status == 0, status, "mutex_lock"); | |
4844 AnyWaiters = _nParked; | |
4845 | |
4846 if (AnyWaiters != 0) { | |
4847 // We intentional signal *after* dropping the lock | |
4848 // to avoid a common class of futile wakeups. | |
4849 status = pthread_cond_signal(_cond); | |
4850 assert_status(status == 0, status, "cond_signal"); | |
4851 } | |
4852 // Mutex should be locked for pthread_cond_signal(_cond). | |
4853 status = pthread_mutex_unlock(_mutex); | |
4854 assert_status(status == 0, status, "mutex_unlock"); | |
4855 } | |
4856 | |
4857 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4858 // This is safe and avoids a common class of futile wakeups. In rare | |
4859 // circumstances this can cause a thread to return prematurely from | |
4860 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4861 // simply re-test the condition and re-park itself. | |
4862 } | |
4863 | |
4864 | |
4865 // JSR166 | |
4866 // ------------------------------------------------------- | |
4867 | |
4868 // | |
4869 // The solaris and linux implementations of park/unpark are fairly | |
4870 // conservative for now, but can be improved. They currently use a | |
4871 // mutex/condvar pair, plus a a count. | |
4872 // Park decrements count if > 0, else does a condvar wait. Unpark | |
4873 // sets count to 1 and signals condvar. Only one thread ever waits | |
4874 // on the condvar. Contention seen when trying to park implies that someone | |
4875 // is unparking you, so don't wait. And spurious returns are fine, so there | |
4876 // is no need to track notifications. | |
4877 // | |
4878 | |
4879 #define MAX_SECS 100000000 | |
4880 // | |
4881 // This code is common to linux and solaris and will be moved to a | |
4882 // common place in dolphin. | |
4883 // | |
4884 // The passed in time value is either a relative time in nanoseconds | |
4885 // or an absolute time in milliseconds. Either way it has to be unpacked | |
4886 // into suitable seconds and nanoseconds components and stored in the | |
4887 // given timespec structure. | |
4888 // Given time is a 64-bit value and the time_t used in the timespec is only | |
4889 // a signed-32-bit value (except on 64-bit Linux) we have to watch for | |
4890 // overflow if times way in the future are given. Further on Solaris versions | |
4891 // prior to 10 there is a restriction (see cond_timedwait) that the specified | |
4892 // number of seconds, in abstime, is less than current_time + 100,000,000. | |
4893 // As it will be 28 years before "now + 100000000" will overflow we can | |
4894 // ignore overflow and just impose a hard-limit on seconds using the value | |
4895 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
4896 // years from "now". | |
4897 // | |
4898 | |
4899 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { | |
4900 assert (time > 0, "convertTime"); | |
4901 | |
4902 struct timeval now; | |
4903 int status = gettimeofday(&now, NULL); | |
4904 assert(status == 0, "gettimeofday"); | |
4905 | |
4906 time_t max_secs = now.tv_sec + MAX_SECS; | |
4907 | |
4908 if (isAbsolute) { | |
4909 jlong secs = time / 1000; | |
4910 if (secs > max_secs) { | |
4911 absTime->tv_sec = max_secs; | |
4912 } | |
4913 else { | |
4914 absTime->tv_sec = secs; | |
4915 } | |
4916 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
4917 } | |
4918 else { | |
4919 jlong secs = time / NANOSECS_PER_SEC; | |
4920 if (secs >= MAX_SECS) { | |
4921 absTime->tv_sec = max_secs; | |
4922 absTime->tv_nsec = 0; | |
4923 } | |
4924 else { | |
4925 absTime->tv_sec = now.tv_sec + secs; | |
4926 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
4927 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
4928 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
4929 ++absTime->tv_sec; // note: this must be <= max_secs | |
4930 } | |
4931 } | |
4932 } | |
4933 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
4934 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
4935 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
4936 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
4937 } | |
4938 | |
4939 void Parker::park(bool isAbsolute, jlong time) { | |
4940 // Optional fast-path check: | |
4941 // Return immediately if a permit is available. | |
4942 if (_counter > 0) { | |
4943 _counter = 0; | |
4944 OrderAccess::fence(); | |
4945 return; | |
4946 } | |
4947 | |
4948 Thread* thread = Thread::current(); | |
4949 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
4950 JavaThread *jt = (JavaThread *)thread; | |
4951 | |
4952 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
4953 // Check interrupt before trying to wait | |
4954 if (Thread::is_interrupted(thread, false)) { | |
4955 return; | |
4956 } | |
4957 | |
4958 // Next, demultiplex/decode time arguments | |
4959 timespec absTime; | |
4960 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all | |
4961 return; | |
4962 } | |
4963 if (time > 0) { | |
4964 unpackTime(&absTime, isAbsolute, time); | |
4965 } | |
4966 | |
4967 | |
4968 // Enter safepoint region | |
4969 // Beware of deadlocks such as 6317397. | |
4970 // The per-thread Parker:: mutex is a classic leaf-lock. | |
4971 // In particular a thread must never block on the Threads_lock while | |
4972 // holding the Parker:: mutex. If safepoints are pending both the | |
4973 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
4974 ThreadBlockInVM tbivm(jt); | |
4975 | |
4976 // Don't wait if cannot get lock since interference arises from | |
4977 // unblocking. Also. check interrupt before trying wait | |
4978 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
4979 return; | |
4980 } | |
4981 | |
4982 int status; | |
4983 if (_counter > 0) { // no wait needed | |
4984 _counter = 0; | |
4985 status = pthread_mutex_unlock(_mutex); | |
4986 assert (status == 0, "invariant"); | |
4987 OrderAccess::fence(); | |
4988 return; | |
4989 } | |
4990 | |
4991 #ifdef ASSERT | |
4992 // Don't catch signals while blocked; let the running threads have the signals. | |
4993 // (This allows a debugger to break into the running thread.) | |
4994 sigset_t oldsigs; | |
4995 sigset_t* allowdebug_blocked = os::Aix::allowdebug_blocked_signals(); | |
4996 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
4997 #endif | |
4998 | |
4999 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
5000 jt->set_suspend_equivalent(); | |
5001 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
5002 | |
5003 if (time == 0) { | |
5004 status = pthread_cond_wait (_cond, _mutex); | |
5005 } else { | |
5006 status = pthread_cond_timedwait (_cond, _mutex, &absTime); | |
5007 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
5008 pthread_cond_destroy (_cond); | |
5009 pthread_cond_init (_cond, NULL); | |
5010 } | |
5011 } | |
5012 assert_status(status == 0 || status == EINTR || | |
5013 status == ETIME || status == ETIMEDOUT, | |
5014 status, "cond_timedwait"); | |
5015 | |
5016 #ifdef ASSERT | |
5017 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
5018 #endif | |
5019 | |
5020 _counter = 0; | |
5021 status = pthread_mutex_unlock(_mutex); | |
5022 assert_status(status == 0, status, "invariant"); | |
5023 // If externally suspended while waiting, re-suspend | |
5024 if (jt->handle_special_suspend_equivalent_condition()) { | |
5025 jt->java_suspend_self(); | |
5026 } | |
5027 | |
5028 OrderAccess::fence(); | |
5029 } | |
5030 | |
5031 void Parker::unpark() { | |
5032 int s, status; | |
5033 status = pthread_mutex_lock(_mutex); | |
5034 assert (status == 0, "invariant"); | |
5035 s = _counter; | |
5036 _counter = 1; | |
5037 if (s < 1) { | |
5038 if (WorkAroundNPTLTimedWaitHang) { | |
5039 status = pthread_cond_signal (_cond); | |
5040 assert (status == 0, "invariant"); | |
5041 status = pthread_mutex_unlock(_mutex); | |
5042 assert (status == 0, "invariant"); | |
5043 } else { | |
5044 status = pthread_mutex_unlock(_mutex); | |
5045 assert (status == 0, "invariant"); | |
5046 status = pthread_cond_signal (_cond); | |
5047 assert (status == 0, "invariant"); | |
5048 } | |
5049 } else { | |
5050 pthread_mutex_unlock(_mutex); | |
5051 assert (status == 0, "invariant"); | |
5052 } | |
5053 } | |
5054 | |
5055 | |
5056 extern char** environ; | |
5057 | |
5058 // Run the specified command in a separate process. Return its exit value, | |
5059 // or -1 on failure (e.g. can't fork a new process). | |
5060 // Unlike system(), this function can be called from signal handler. It | |
5061 // doesn't block SIGINT et al. | |
5062 int os::fork_and_exec(char* cmd) { | |
5063 Unimplemented(); | |
5064 return 0; | |
5065 } | |
5066 | |
5067 // is_headless_jre() | |
5068 // | |
5069 // Test for the existence of xawt/libmawt.so or libawt_xawt.so | |
5070 // in order to report if we are running in a headless jre. | |
5071 // | |
5072 // Since JDK8 xawt/libmawt.so is moved into the same directory | |
5073 // as libawt.so, and renamed libawt_xawt.so | |
5074 bool os::is_headless_jre() { | |
5075 struct stat statbuf; | |
5076 char buf[MAXPATHLEN]; | |
5077 char libmawtpath[MAXPATHLEN]; | |
5078 const char *xawtstr = "/xawt/libmawt.so"; | |
5079 const char *new_xawtstr = "/libawt_xawt.so"; | |
5080 | |
5081 char *p; | |
5082 | |
5083 // Get path to libjvm.so | |
5084 os::jvm_path(buf, sizeof(buf)); | |
5085 | |
5086 // Get rid of libjvm.so | |
5087 p = strrchr(buf, '/'); | |
5088 if (p == NULL) return false; | |
5089 else *p = '\0'; | |
5090 | |
5091 // Get rid of client or server | |
5092 p = strrchr(buf, '/'); | |
5093 if (p == NULL) return false; | |
5094 else *p = '\0'; | |
5095 | |
5096 // check xawt/libmawt.so | |
5097 strcpy(libmawtpath, buf); | |
5098 strcat(libmawtpath, xawtstr); | |
5099 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
5100 | |
5101 // check libawt_xawt.so | |
5102 strcpy(libmawtpath, buf); | |
5103 strcat(libmawtpath, new_xawtstr); | |
5104 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
5105 | |
5106 return true; | |
5107 } | |
5108 | |
5109 // Get the default path to the core file | |
5110 // Returns the length of the string | |
5111 int os::get_core_path(char* buffer, size_t bufferSize) { | |
5112 const char* p = get_current_directory(buffer, bufferSize); | |
5113 | |
5114 if (p == NULL) { | |
5115 assert(p != NULL, "failed to get current directory"); | |
5116 return 0; | |
5117 } | |
5118 | |
5119 return strlen(buffer); | |
5120 } | |
5121 | |
5122 #ifndef PRODUCT | |
5123 void TestReserveMemorySpecial_test() { | |
5124 // No tests available for this platform | |
5125 } | |
5126 #endif |