Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 17930:8c7ba9f705a1
8043308: new hotspot build - hs25.20-b16
Reviewed-by: jcoomes
author | amurillo |
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date | Fri, 16 May 2014 03:28:59 -0700 |
parents | 917873d2983d |
children | 78bbf4d43a14 |
rev | line source |
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3960 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
3960 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 // no precompiled headers | |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "classfile/vmSymbols.hpp" | |
29 #include "code/icBuffer.hpp" | |
30 #include "code/vtableStubs.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
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32 #include "compiler/disassembler.hpp" |
3960 | 33 #include "interpreter/interpreter.hpp" |
34 #include "jvm_bsd.h" | |
35 #include "memory/allocation.inline.hpp" | |
36 #include "memory/filemap.hpp" | |
37 #include "mutex_bsd.inline.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "os_share_bsd.hpp" | |
40 #include "prims/jniFastGetField.hpp" | |
41 #include "prims/jvm.h" | |
42 #include "prims/jvm_misc.hpp" | |
43 #include "runtime/arguments.hpp" | |
44 #include "runtime/extendedPC.hpp" | |
45 #include "runtime/globals.hpp" | |
46 #include "runtime/interfaceSupport.hpp" | |
47 #include "runtime/java.hpp" | |
48 #include "runtime/javaCalls.hpp" | |
49 #include "runtime/mutexLocker.hpp" | |
50 #include "runtime/objectMonitor.hpp" | |
51 #include "runtime/osThread.hpp" | |
52 #include "runtime/perfMemory.hpp" | |
53 #include "runtime/sharedRuntime.hpp" | |
54 #include "runtime/statSampler.hpp" | |
55 #include "runtime/stubRoutines.hpp" | |
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56 #include "runtime/thread.inline.hpp" |
3960 | 57 #include "runtime/threadCritical.hpp" |
58 #include "runtime/timer.hpp" | |
59 #include "services/attachListener.hpp" | |
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60 #include "services/memTracker.hpp" |
3960 | 61 #include "services/runtimeService.hpp" |
62 #include "utilities/decoder.hpp" | |
63 #include "utilities/defaultStream.hpp" | |
64 #include "utilities/events.hpp" | |
65 #include "utilities/growableArray.hpp" | |
66 #include "utilities/vmError.hpp" | |
67 | |
68 // put OS-includes here | |
69 # include <sys/types.h> | |
70 # include <sys/mman.h> | |
71 # include <sys/stat.h> | |
72 # include <sys/select.h> | |
73 # include <pthread.h> | |
74 # include <signal.h> | |
75 # include <errno.h> | |
76 # include <dlfcn.h> | |
77 # include <stdio.h> | |
78 # include <unistd.h> | |
79 # include <sys/resource.h> | |
80 # include <pthread.h> | |
81 # include <sys/stat.h> | |
82 # include <sys/time.h> | |
83 # include <sys/times.h> | |
84 # include <sys/utsname.h> | |
85 # include <sys/socket.h> | |
86 # include <sys/wait.h> | |
87 # include <time.h> | |
88 # include <pwd.h> | |
89 # include <poll.h> | |
90 # include <semaphore.h> | |
91 # include <fcntl.h> | |
92 # include <string.h> | |
93 # include <sys/param.h> | |
94 # include <sys/sysctl.h> | |
95 # include <sys/ipc.h> | |
96 # include <sys/shm.h> | |
97 #ifndef __APPLE__ | |
98 # include <link.h> | |
99 #endif | |
100 # include <stdint.h> | |
101 # include <inttypes.h> | |
102 # include <sys/ioctl.h> | |
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103 # include <sys/syscall.h> |
3960 | 104 |
105 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
106 # include <elf.h> | |
107 #endif | |
108 | |
109 #ifdef __APPLE__ | |
4006 | 110 # include <mach/mach.h> // semaphore_* API |
111 # include <mach-o/dyld.h> | |
112 # include <sys/proc_info.h> | |
113 # include <objc/objc-auto.h> | |
3960 | 114 #endif |
115 | |
116 #ifndef MAP_ANONYMOUS | |
117 #define MAP_ANONYMOUS MAP_ANON | |
118 #endif | |
119 | |
120 #define MAX_PATH (2 * K) | |
121 | |
122 // for timer info max values which include all bits | |
123 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
124 | |
125 #define LARGEPAGES_BIT (1 << 6) | |
126 //////////////////////////////////////////////////////////////////////////////// | |
127 // global variables | |
128 julong os::Bsd::_physical_memory = 0; | |
129 | |
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130 #ifdef __APPLE__ |
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131 mach_timebase_info_data_t os::Bsd::_timebase_info = {0, 0}; |
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132 volatile uint64_t os::Bsd::_max_abstime = 0; |
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133 #else |
3960 | 134 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; |
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135 #endif |
3960 | 136 pthread_t os::Bsd::_main_thread; |
137 int os::Bsd::_page_size = -1; | |
138 | |
139 static jlong initial_time_count=0; | |
140 | |
141 static int clock_tics_per_sec = 100; | |
142 | |
143 // For diagnostics to print a message once. see run_periodic_checks | |
144 static sigset_t check_signal_done; | |
6918 | 145 static bool check_signals = true; |
3960 | 146 |
147 static pid_t _initial_pid = 0; | |
148 | |
149 /* Signal number used to suspend/resume a thread */ | |
150 | |
151 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
152 static int SR_signum = SIGUSR2; | |
153 sigset_t SR_sigset; | |
154 | |
155 | |
156 //////////////////////////////////////////////////////////////////////////////// | |
157 // utility functions | |
158 | |
159 static int SR_initialize(); | |
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160 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); |
3960 | 161 |
162 julong os::available_memory() { | |
163 return Bsd::available_memory(); | |
164 } | |
165 | |
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166 // available here means free |
3960 | 167 julong os::Bsd::available_memory() { |
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168 uint64_t available = physical_memory() >> 2; |
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169 #ifdef __APPLE__ |
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170 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; |
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171 vm_statistics64_data_t vmstat; |
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172 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, |
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173 (host_info64_t)&vmstat, &count); |
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174 assert(kerr == KERN_SUCCESS, |
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175 "host_statistics64 failed - check mach_host_self() and count"); |
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176 if (kerr == KERN_SUCCESS) { |
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177 available = vmstat.free_count * os::vm_page_size(); |
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178 } |
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179 #endif |
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180 return available; |
3960 | 181 } |
182 | |
183 julong os::physical_memory() { | |
184 return Bsd::physical_memory(); | |
185 } | |
186 | |
187 //////////////////////////////////////////////////////////////////////////////// | |
188 // environment support | |
189 | |
190 bool os::getenv(const char* name, char* buf, int len) { | |
191 const char* val = ::getenv(name); | |
192 if (val != NULL && strlen(val) < (size_t)len) { | |
193 strcpy(buf, val); | |
194 return true; | |
195 } | |
196 if (len > 0) buf[0] = 0; // return a null string | |
197 return false; | |
198 } | |
199 | |
200 | |
201 // Return true if user is running as root. | |
202 | |
203 bool os::have_special_privileges() { | |
204 static bool init = false; | |
205 static bool privileges = false; | |
206 if (!init) { | |
207 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
208 init = true; | |
209 } | |
210 return privileges; | |
211 } | |
212 | |
213 | |
214 | |
215 // Cpu architecture string | |
216 #if defined(ZERO) | |
217 static char cpu_arch[] = ZERO_LIBARCH; | |
218 #elif defined(IA64) | |
219 static char cpu_arch[] = "ia64"; | |
220 #elif defined(IA32) | |
221 static char cpu_arch[] = "i386"; | |
222 #elif defined(AMD64) | |
223 static char cpu_arch[] = "amd64"; | |
224 #elif defined(ARM) | |
225 static char cpu_arch[] = "arm"; | |
14390 | 226 #elif defined(PPC32) |
3960 | 227 static char cpu_arch[] = "ppc"; |
228 #elif defined(SPARC) | |
229 # ifdef _LP64 | |
230 static char cpu_arch[] = "sparcv9"; | |
231 # else | |
232 static char cpu_arch[] = "sparc"; | |
233 # endif | |
234 #else | |
235 #error Add appropriate cpu_arch setting | |
236 #endif | |
237 | |
4846 | 238 // Compiler variant |
239 #ifdef COMPILER2 | |
240 #define COMPILER_VARIANT "server" | |
241 #else | |
242 #define COMPILER_VARIANT "client" | |
243 #endif | |
3960 | 244 |
6918 | 245 |
3960 | 246 void os::Bsd::initialize_system_info() { |
247 int mib[2]; | |
248 size_t len; | |
249 int cpu_val; | |
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250 julong mem_val; |
3960 | 251 |
252 /* get processors count via hw.ncpus sysctl */ | |
253 mib[0] = CTL_HW; | |
254 mib[1] = HW_NCPU; | |
255 len = sizeof(cpu_val); | |
256 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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257 assert(len == sizeof(cpu_val), "unexpected data size"); |
3960 | 258 set_processor_count(cpu_val); |
259 } | |
260 else { | |
261 set_processor_count(1); // fallback | |
262 } | |
263 | |
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264 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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265 * since it returns a 64 bit value) |
3960 | 266 */ |
267 mib[0] = CTL_HW; | |
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268 |
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269 #if defined (HW_MEMSIZE) // Apple |
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270 mib[1] = HW_MEMSIZE; |
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271 #elif defined(HW_PHYSMEM) // Most of BSD |
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272 mib[1] = HW_PHYSMEM; |
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273 #elif defined(HW_REALMEM) // Old FreeBSD |
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274 mib[1] = HW_REALMEM; |
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275 #else |
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276 #error No ways to get physmem |
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277 #endif |
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278 |
3960 | 279 len = sizeof(mem_val); |
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280 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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281 assert(len == sizeof(mem_val), "unexpected data size"); |
3960 | 282 _physical_memory = mem_val; |
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283 } else { |
3960 | 284 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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285 } |
3960 | 286 |
287 #ifdef __OpenBSD__ | |
288 { | |
289 // limit _physical_memory memory view on OpenBSD since | |
290 // datasize rlimit restricts us anyway. | |
291 struct rlimit limits; | |
292 getrlimit(RLIMIT_DATA, &limits); | |
293 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
294 } | |
295 #endif | |
296 } | |
297 | |
4006 | 298 #ifdef __APPLE__ |
299 static const char *get_home() { | |
300 const char *home_dir = ::getenv("HOME"); | |
301 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
302 struct passwd *passwd_info = getpwuid(geteuid()); | |
303 if (passwd_info != NULL) { | |
304 home_dir = passwd_info->pw_dir; | |
305 } | |
306 } | |
307 | |
308 return home_dir; | |
309 } | |
310 #endif | |
311 | |
3960 | 312 void os::init_system_properties_values() { |
313 // The next steps are taken in the product version: | |
314 // | |
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315 // Obtain the JAVA_HOME value from the location of libjvm.so. |
3960 | 316 // This library should be located at: |
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317 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
3960 | 318 // |
319 // If "/jre/lib/" appears at the right place in the path, then we | |
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320 // assume libjvm.so is installed in a JDK and we use this path. |
3960 | 321 // |
322 // Otherwise exit with message: "Could not create the Java virtual machine." | |
323 // | |
324 // The following extra steps are taken in the debugging version: | |
325 // | |
326 // If "/jre/lib/" does NOT appear at the right place in the path | |
327 // instead of exit check for $JAVA_HOME environment variable. | |
328 // | |
329 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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330 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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331 // it looks like libjvm.so is installed there |
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332 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
3960 | 333 // |
334 // Otherwise exit. | |
335 // | |
336 // Important note: if the location of libjvm.so changes this | |
337 // code needs to be changed accordingly. | |
338 | |
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339 // See ld(1): |
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340 // The linker uses the following search paths to locate required |
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341 // shared libraries: |
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342 // 1: ... |
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343 // ... |
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344 // 7: The default directories, normally /lib and /usr/lib. |
3960 | 345 #ifndef DEFAULT_LIBPATH |
346 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
347 #endif | |
348 | |
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349 // Base path of extensions installed on the system. |
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350 #define SYS_EXT_DIR "/usr/java/packages" |
3960 | 351 #define EXTENSIONS_DIR "/lib/ext" |
352 #define ENDORSED_DIR "/lib/endorsed" | |
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353 |
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354 #ifndef __APPLE__ |
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355 |
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356 // Buffer that fits several sprintfs. |
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357 // Note that the space for the colon and the trailing null are provided |
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358 // by the nulls included by the sizeof operator. |
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359 const size_t bufsize = |
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360 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. |
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361 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir |
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362 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir |
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363 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
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364 |
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365 // sysclasspath, java_home, dll_dir |
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366 { |
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367 char *pslash; |
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368 os::jvm_path(buf, bufsize); |
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369 |
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370 // Found the full path to libjvm.so. |
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371 // Now cut the path to <java_home>/jre if we can. |
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372 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
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373 pslash = strrchr(buf, '/'); |
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374 if (pslash != NULL) { |
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375 *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
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376 } |
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377 Arguments::set_dll_dir(buf); |
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378 |
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379 if (pslash != NULL) { |
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380 pslash = strrchr(buf, '/'); |
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381 if (pslash != NULL) { |
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382 *pslash = '\0'; // Get rid of /<arch>. |
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383 pslash = strrchr(buf, '/'); |
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384 if (pslash != NULL) { |
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385 *pslash = '\0'; // Get rid of /lib. |
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386 } |
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387 } |
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388 } |
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389 Arguments::set_java_home(buf); |
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390 set_boot_path('/', ':'); |
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391 } |
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392 |
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393 // Where to look for native libraries. |
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394 // |
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395 // Note: Due to a legacy implementation, most of the library path |
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396 // is set in the launcher. This was to accomodate linking restrictions |
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397 // on legacy Bsd implementations (which are no longer supported). |
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398 // Eventually, all the library path setting will be done here. |
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399 // |
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400 // However, to prevent the proliferation of improperly built native |
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401 // libraries, the new path component /usr/java/packages is added here. |
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402 // Eventually, all the library path setting will be done here. |
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403 { |
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404 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
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405 // should always exist (until the legacy problem cited above is |
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406 // addressed). |
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407 const char *v = ::getenv("LD_LIBRARY_PATH"); |
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408 const char *v_colon = ":"; |
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409 if (v == NULL) { v = ""; v_colon = ""; } |
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410 // That's +1 for the colon and +1 for the trailing '\0'. |
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411 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
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412 strlen(v) + 1 + |
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413 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, |
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414 mtInternal); |
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415 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); |
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416 Arguments::set_library_path(ld_library_path); |
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417 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal); |
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418 } |
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419 |
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420 // Extensions directories. |
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421 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); |
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422 Arguments::set_ext_dirs(buf); |
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423 |
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424 // Endorsed standards default directory. |
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425 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); |
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426 Arguments::set_endorsed_dirs(buf); |
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427 |
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428 FREE_C_HEAP_ARRAY(char, buf, mtInternal); |
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429 |
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430 #else // __APPLE__ |
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431 |
4006 | 432 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" |
433 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
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434 |
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435 const char *user_home_dir = get_home(); |
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436 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. |
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437 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + |
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438 sizeof(SYS_EXTENSIONS_DIRS); |
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439 |
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440 // Buffer that fits several sprintfs. |
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441 // Note that the space for the colon and the trailing null are provided |
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442 // by the nulls included by the sizeof operator. |
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443 const size_t bufsize = |
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444 MAX3((size_t)MAXPATHLEN, // for dll_dir & friends. |
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445 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size, // extensions dir |
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446 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir |
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447 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
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448 |
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449 // sysclasspath, java_home, dll_dir |
3960 | 450 { |
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451 char *pslash; |
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452 os::jvm_path(buf, bufsize); |
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453 |
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454 // Found the full path to libjvm.so. |
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455 // Now cut the path to <java_home>/jre if we can. |
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456 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
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457 pslash = strrchr(buf, '/'); |
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458 if (pslash != NULL) { |
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459 *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
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460 } |
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461 Arguments::set_dll_dir(buf); |
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462 |
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463 if (pslash != NULL) { |
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464 pslash = strrchr(buf, '/'); |
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465 if (pslash != NULL) { |
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466 *pslash = '\0'; // Get rid of /lib. |
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467 } |
3960 | 468 } |
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469 Arguments::set_java_home(buf); |
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470 set_boot_path('/', ':'); |
3960 | 471 } |
472 | |
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473 // Where to look for native libraries. |
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474 // |
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475 // Note: Due to a legacy implementation, most of the library path |
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476 // is set in the launcher. This was to accomodate linking restrictions |
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477 // on legacy Bsd implementations (which are no longer supported). |
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478 // Eventually, all the library path setting will be done here. |
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479 // |
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480 // However, to prevent the proliferation of improperly built native |
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481 // libraries, the new path component /usr/java/packages is added here. |
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482 // Eventually, all the library path setting will be done here. |
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483 { |
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484 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
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485 // should always exist (until the legacy problem cited above is |
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486 // addressed). |
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487 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code |
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488 // can specify a directory inside an app wrapper |
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489 const char *l = ::getenv("JAVA_LIBRARY_PATH"); |
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490 const char *l_colon = ":"; |
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491 if (l == NULL) { l = ""; l_colon = ""; } |
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492 |
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493 const char *v = ::getenv("DYLD_LIBRARY_PATH"); |
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494 const char *v_colon = ":"; |
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495 if (v == NULL) { v = ""; v_colon = ""; } |
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496 |
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497 // Apple's Java6 has "." at the beginning of java.library.path. |
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498 // OpenJDK on Windows has "." at the end of java.library.path. |
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499 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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500 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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501 // "." is appended to the end of java.library.path. Yes, this |
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502 // could cause a change in behavior, but Apple's Java6 behavior |
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503 // can be achieved by putting "." at the beginning of the |
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504 // JAVA_LIBRARY_PATH environment variable. |
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505 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
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506 strlen(v) + 1 + strlen(l) + 1 + |
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507 system_ext_size + 3, |
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508 mtInternal); |
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509 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", |
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510 v, v_colon, l, l_colon, user_home_dir); |
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511 Arguments::set_library_path(ld_library_path); |
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512 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal); |
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513 } |
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514 |
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515 // Extensions directories. |
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516 // |
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517 // Note that the space for the colon and the trailing null are provided |
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518 // by the nulls included by the sizeof operator (so actually one byte more |
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519 // than necessary is allocated). |
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520 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, |
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521 user_home_dir, Arguments::get_java_home()); |
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522 Arguments::set_ext_dirs(buf); |
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523 |
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524 // Endorsed standards default directory. |
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525 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); |
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526 Arguments::set_endorsed_dirs(buf); |
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527 |
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528 FREE_C_HEAP_ARRAY(char, buf, mtInternal); |
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529 |
4006 | 530 #undef SYS_EXTENSIONS_DIR |
17848
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531 #undef SYS_EXTENSIONS_DIRS |
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532 |
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533 #endif // __APPLE__ |
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534 |
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535 #undef SYS_EXT_DIR |
3960 | 536 #undef EXTENSIONS_DIR |
537 #undef ENDORSED_DIR | |
538 } | |
539 | |
540 //////////////////////////////////////////////////////////////////////////////// | |
541 // breakpoint support | |
542 | |
543 void os::breakpoint() { | |
544 BREAKPOINT; | |
545 } | |
546 | |
547 extern "C" void breakpoint() { | |
548 // use debugger to set breakpoint here | |
549 } | |
550 | |
551 //////////////////////////////////////////////////////////////////////////////// | |
552 // signal support | |
553 | |
554 debug_only(static bool signal_sets_initialized = false); | |
555 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
556 | |
557 bool os::Bsd::is_sig_ignored(int sig) { | |
558 struct sigaction oact; | |
559 sigaction(sig, (struct sigaction*)NULL, &oact); | |
560 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
561 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
562 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
563 return true; | |
564 else | |
565 return false; | |
566 } | |
567 | |
568 void os::Bsd::signal_sets_init() { | |
569 // Should also have an assertion stating we are still single-threaded. | |
570 assert(!signal_sets_initialized, "Already initialized"); | |
571 // Fill in signals that are necessarily unblocked for all threads in | |
572 // the VM. Currently, we unblock the following signals: | |
573 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
574 // by -Xrs (=ReduceSignalUsage)); | |
575 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
576 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
577 // the dispositions or masks wrt these signals. | |
578 // Programs embedding the VM that want to use the above signals for their | |
579 // own purposes must, at this time, use the "-Xrs" option to prevent | |
580 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
581 // (See bug 4345157, and other related bugs). | |
582 // In reality, though, unblocking these signals is really a nop, since | |
583 // these signals are not blocked by default. | |
584 sigemptyset(&unblocked_sigs); | |
585 sigemptyset(&allowdebug_blocked_sigs); | |
586 sigaddset(&unblocked_sigs, SIGILL); | |
587 sigaddset(&unblocked_sigs, SIGSEGV); | |
588 sigaddset(&unblocked_sigs, SIGBUS); | |
589 sigaddset(&unblocked_sigs, SIGFPE); | |
590 sigaddset(&unblocked_sigs, SR_signum); | |
591 | |
592 if (!ReduceSignalUsage) { | |
593 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
594 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
595 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
596 } | |
597 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
598 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
599 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
600 } | |
601 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
602 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
603 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
604 } | |
605 } | |
606 // Fill in signals that are blocked by all but the VM thread. | |
607 sigemptyset(&vm_sigs); | |
608 if (!ReduceSignalUsage) | |
609 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
610 debug_only(signal_sets_initialized = true); | |
611 | |
612 } | |
613 | |
614 // These are signals that are unblocked while a thread is running Java. | |
615 // (For some reason, they get blocked by default.) | |
616 sigset_t* os::Bsd::unblocked_signals() { | |
617 assert(signal_sets_initialized, "Not initialized"); | |
618 return &unblocked_sigs; | |
619 } | |
620 | |
621 // These are the signals that are blocked while a (non-VM) thread is | |
622 // running Java. Only the VM thread handles these signals. | |
623 sigset_t* os::Bsd::vm_signals() { | |
624 assert(signal_sets_initialized, "Not initialized"); | |
625 return &vm_sigs; | |
626 } | |
627 | |
628 // These are signals that are blocked during cond_wait to allow debugger in | |
629 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
630 assert(signal_sets_initialized, "Not initialized"); | |
631 return &allowdebug_blocked_sigs; | |
632 } | |
633 | |
634 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
635 | |
636 //Save caller's signal mask before setting VM signal mask | |
637 sigset_t caller_sigmask; | |
638 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
639 | |
640 OSThread* osthread = thread->osthread(); | |
641 osthread->set_caller_sigmask(caller_sigmask); | |
642 | |
643 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
644 | |
645 if (!ReduceSignalUsage) { | |
646 if (thread->is_VM_thread()) { | |
647 // Only the VM thread handles BREAK_SIGNAL ... | |
648 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
649 } else { | |
650 // ... all other threads block BREAK_SIGNAL | |
651 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
652 } | |
653 } | |
654 } | |
655 | |
656 | |
657 ////////////////////////////////////////////////////////////////////////////// | |
658 // create new thread | |
659 | |
660 // check if it's safe to start a new thread | |
661 static bool _thread_safety_check(Thread* thread) { | |
6918 | 662 return true; |
3960 | 663 } |
664 | |
4006 | 665 #ifdef __APPLE__ |
666 // library handle for calling objc_registerThreadWithCollector() | |
667 // without static linking to the libobjc library | |
668 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
669 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
670 typedef void (*objc_registerThreadWithCollector_t)(); | |
671 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
672 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
673 #endif | |
674 | |
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675 #ifdef __APPLE__ |
12095 | 676 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { |
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677 // Additional thread_id used to correlate threads in SA |
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678 thread_identifier_info_data_t m_ident_info; |
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679 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
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680 |
12095 | 681 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, |
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682 (thread_info_t) &m_ident_info, &count); |
12095 | 683 |
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684 return m_ident_info.thread_id; |
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685 } |
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686 #endif |
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687 |
3960 | 688 // Thread start routine for all newly created threads |
689 static void *java_start(Thread *thread) { | |
690 // Try to randomize the cache line index of hot stack frames. | |
691 // This helps when threads of the same stack traces evict each other's | |
692 // cache lines. The threads can be either from the same JVM instance, or | |
693 // from different JVM instances. The benefit is especially true for | |
694 // processors with hyperthreading technology. | |
695 static int counter = 0; | |
696 int pid = os::current_process_id(); | |
697 alloca(((pid ^ counter++) & 7) * 128); | |
698 | |
699 ThreadLocalStorage::set_thread(thread); | |
700 | |
701 OSThread* osthread = thread->osthread(); | |
702 Monitor* sync = osthread->startThread_lock(); | |
703 | |
704 // non floating stack BsdThreads needs extra check, see above | |
705 if (!_thread_safety_check(thread)) { | |
706 // notify parent thread | |
707 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
708 osthread->set_state(ZOMBIE); | |
709 sync->notify_all(); | |
710 return NULL; | |
711 } | |
712 | |
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713 osthread->set_thread_id(os::Bsd::gettid()); |
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714 |
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715 #ifdef __APPLE__ |
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716 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
12095 | 717 guarantee(unique_thread_id != 0, "unique thread id was not found"); |
718 osthread->set_unique_thread_id(unique_thread_id); | |
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719 #endif |
3960 | 720 // initialize signal mask for this thread |
721 os::Bsd::hotspot_sigmask(thread); | |
722 | |
723 // initialize floating point control register | |
724 os::Bsd::init_thread_fpu_state(); | |
725 | |
4006 | 726 #ifdef __APPLE__ |
727 // register thread with objc gc | |
728 if (objc_registerThreadWithCollectorFunction != NULL) { | |
729 objc_registerThreadWithCollectorFunction(); | |
730 } | |
731 #endif | |
732 | |
3960 | 733 // handshaking with parent thread |
734 { | |
735 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
736 | |
737 // notify parent thread | |
738 osthread->set_state(INITIALIZED); | |
739 sync->notify_all(); | |
740 | |
741 // wait until os::start_thread() | |
742 while (osthread->get_state() == INITIALIZED) { | |
743 sync->wait(Mutex::_no_safepoint_check_flag); | |
744 } | |
745 } | |
746 | |
747 // call one more level start routine | |
748 thread->run(); | |
749 | |
750 return 0; | |
751 } | |
752 | |
753 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
754 assert(thread->osthread() == NULL, "caller responsible"); | |
755 | |
756 // Allocate the OSThread object | |
757 OSThread* osthread = new OSThread(NULL, NULL); | |
758 if (osthread == NULL) { | |
759 return false; | |
760 } | |
761 | |
762 // set the correct thread state | |
763 osthread->set_thread_type(thr_type); | |
764 | |
765 // Initial state is ALLOCATED but not INITIALIZED | |
766 osthread->set_state(ALLOCATED); | |
767 | |
768 thread->set_osthread(osthread); | |
769 | |
770 // init thread attributes | |
771 pthread_attr_t attr; | |
772 pthread_attr_init(&attr); | |
773 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
774 | |
775 // stack size | |
776 if (os::Bsd::supports_variable_stack_size()) { | |
777 // calculate stack size if it's not specified by caller | |
778 if (stack_size == 0) { | |
779 stack_size = os::Bsd::default_stack_size(thr_type); | |
780 | |
781 switch (thr_type) { | |
782 case os::java_thread: | |
783 // Java threads use ThreadStackSize which default value can be | |
784 // changed with the flag -Xss | |
785 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
786 stack_size = JavaThread::stack_size_at_create(); | |
787 break; | |
788 case os::compiler_thread: | |
789 if (CompilerThreadStackSize > 0) { | |
790 stack_size = (size_t)(CompilerThreadStackSize * K); | |
791 break; | |
792 } // else fall through: | |
793 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
794 case os::vm_thread: | |
795 case os::pgc_thread: | |
796 case os::cgc_thread: | |
797 case os::watcher_thread: | |
798 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
799 break; | |
800 } | |
801 } | |
802 | |
803 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
804 pthread_attr_setstacksize(&attr, stack_size); | |
805 } else { | |
806 // let pthread_create() pick the default value. | |
807 } | |
808 | |
809 ThreadState state; | |
810 | |
811 { | |
812 pthread_t tid; | |
813 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
814 | |
815 pthread_attr_destroy(&attr); | |
816 | |
817 if (ret != 0) { | |
818 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
819 perror("pthread_create()"); | |
820 } | |
821 // Need to clean up stuff we've allocated so far | |
822 thread->set_osthread(NULL); | |
823 delete osthread; | |
824 return false; | |
825 } | |
826 | |
827 // Store pthread info into the OSThread | |
828 osthread->set_pthread_id(tid); | |
829 | |
830 // Wait until child thread is either initialized or aborted | |
831 { | |
832 Monitor* sync_with_child = osthread->startThread_lock(); | |
833 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
834 while ((state = osthread->get_state()) == ALLOCATED) { | |
835 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
836 } | |
837 } | |
838 | |
839 } | |
840 | |
841 // Aborted due to thread limit being reached | |
842 if (state == ZOMBIE) { | |
843 thread->set_osthread(NULL); | |
844 delete osthread; | |
845 return false; | |
846 } | |
847 | |
848 // The thread is returned suspended (in state INITIALIZED), | |
849 // and is started higher up in the call chain | |
850 assert(state == INITIALIZED, "race condition"); | |
851 return true; | |
852 } | |
853 | |
854 ///////////////////////////////////////////////////////////////////////////// | |
855 // attach existing thread | |
856 | |
857 // bootstrap the main thread | |
858 bool os::create_main_thread(JavaThread* thread) { | |
859 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
860 return create_attached_thread(thread); | |
861 } | |
862 | |
863 bool os::create_attached_thread(JavaThread* thread) { | |
864 #ifdef ASSERT | |
865 thread->verify_not_published(); | |
866 #endif | |
867 | |
868 // Allocate the OSThread object | |
869 OSThread* osthread = new OSThread(NULL, NULL); | |
870 | |
871 if (osthread == NULL) { | |
872 return false; | |
873 } | |
874 | |
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875 osthread->set_thread_id(os::Bsd::gettid()); |
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876 |
3960 | 877 // Store pthread info into the OSThread |
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878 #ifdef __APPLE__ |
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879 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
12095 | 880 guarantee(unique_thread_id != 0, "just checking"); |
881 osthread->set_unique_thread_id(unique_thread_id); | |
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882 #endif |
3960 | 883 osthread->set_pthread_id(::pthread_self()); |
884 | |
885 // initialize floating point control register | |
886 os::Bsd::init_thread_fpu_state(); | |
887 | |
888 // Initial thread state is RUNNABLE | |
889 osthread->set_state(RUNNABLE); | |
890 | |
891 thread->set_osthread(osthread); | |
892 | |
893 // initialize signal mask for this thread | |
894 // and save the caller's signal mask | |
895 os::Bsd::hotspot_sigmask(thread); | |
896 | |
897 return true; | |
898 } | |
899 | |
900 void os::pd_start_thread(Thread* thread) { | |
901 OSThread * osthread = thread->osthread(); | |
902 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
903 Monitor* sync_with_child = osthread->startThread_lock(); | |
904 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
905 sync_with_child->notify(); | |
906 } | |
907 | |
908 // Free Bsd resources related to the OSThread | |
909 void os::free_thread(OSThread* osthread) { | |
910 assert(osthread != NULL, "osthread not set"); | |
911 | |
912 if (Thread::current()->osthread() == osthread) { | |
913 // Restore caller's signal mask | |
914 sigset_t sigmask = osthread->caller_sigmask(); | |
915 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
916 } | |
917 | |
918 delete osthread; | |
919 } | |
920 | |
921 ////////////////////////////////////////////////////////////////////////////// | |
922 // thread local storage | |
923 | |
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924 // Restore the thread pointer if the destructor is called. This is in case |
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925 // someone from JNI code sets up a destructor with pthread_key_create to run |
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926 // detachCurrentThread on thread death. Unless we restore the thread pointer we |
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927 // will hang or crash. When detachCurrentThread is called the key will be set |
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928 // to null and we will not be called again. If detachCurrentThread is never |
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929 // called we could loop forever depending on the pthread implementation. |
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930 static void restore_thread_pointer(void* p) { |
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931 Thread* thread = (Thread*) p; |
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932 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); |
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933 } |
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934 |
3960 | 935 int os::allocate_thread_local_storage() { |
936 pthread_key_t key; | |
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937 int rslt = pthread_key_create(&key, restore_thread_pointer); |
3960 | 938 assert(rslt == 0, "cannot allocate thread local storage"); |
939 return (int)key; | |
940 } | |
941 | |
942 // Note: This is currently not used by VM, as we don't destroy TLS key | |
943 // on VM exit. | |
944 void os::free_thread_local_storage(int index) { | |
945 int rslt = pthread_key_delete((pthread_key_t)index); | |
946 assert(rslt == 0, "invalid index"); | |
947 } | |
948 | |
949 void os::thread_local_storage_at_put(int index, void* value) { | |
950 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
951 assert(rslt == 0, "pthread_setspecific failed"); | |
952 } | |
953 | |
954 extern "C" Thread* get_thread() { | |
955 return ThreadLocalStorage::thread(); | |
956 } | |
957 | |
958 | |
959 //////////////////////////////////////////////////////////////////////////////// | |
960 // time support | |
961 | |
962 // Time since start-up in seconds to a fine granularity. | |
963 // Used by VMSelfDestructTimer and the MemProfiler. | |
964 double os::elapsedTime() { | |
965 | |
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966 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); |
3960 | 967 } |
968 | |
969 jlong os::elapsed_counter() { | |
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970 return javaTimeNanos() - initial_time_count; |
3960 | 971 } |
972 | |
973 jlong os::elapsed_frequency() { | |
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974 return NANOSECS_PER_SEC; // nanosecond resolution |
3960 | 975 } |
976 | |
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977 bool os::supports_vtime() { return true; } |
3960 | 978 bool os::enable_vtime() { return false; } |
979 bool os::vtime_enabled() { return false; } | |
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980 |
3960 | 981 double os::elapsedVTime() { |
982 // better than nothing, but not much | |
983 return elapsedTime(); | |
984 } | |
985 | |
986 jlong os::javaTimeMillis() { | |
987 timeval time; | |
988 int status = gettimeofday(&time, NULL); | |
989 assert(status != -1, "bsd error"); | |
990 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
991 } | |
992 | |
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993 #ifndef __APPLE__ |
3960 | 994 #ifndef CLOCK_MONOTONIC |
995 #define CLOCK_MONOTONIC (1) | |
996 #endif | |
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997 #endif |
3960 | 998 |
999 #ifdef __APPLE__ | |
1000 void os::Bsd::clock_init() { | |
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1001 mach_timebase_info(&_timebase_info); |
3960 | 1002 } |
6918 | 1003 #else |
3960 | 1004 void os::Bsd::clock_init() { |
1005 struct timespec res; | |
1006 struct timespec tp; | |
1007 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
1008 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
1009 // yes, monotonic clock is supported | |
1010 _clock_gettime = ::clock_gettime; | |
1011 } | |
1012 } | |
1013 #endif | |
1014 | |
1015 | |
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1016 #ifdef __APPLE__ |
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1017 |
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1018 jlong os::javaTimeNanos() { |
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1019 const uint64_t tm = mach_absolute_time(); |
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1020 const uint64_t now = (tm * Bsd::_timebase_info.numer) / Bsd::_timebase_info.denom; |
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1021 const uint64_t prev = Bsd::_max_abstime; |
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1022 if (now <= prev) { |
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1023 return prev; // same or retrograde time; |
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1024 } |
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1025 const uint64_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&Bsd::_max_abstime, prev); |
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1026 assert(obsv >= prev, "invariant"); // Monotonicity |
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1027 // If the CAS succeeded then we're done and return "now". |
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1028 // If the CAS failed and the observed value "obsv" is >= now then |
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1029 // we should return "obsv". If the CAS failed and now > obsv > prv then |
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1030 // some other thread raced this thread and installed a new value, in which case |
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1031 // we could either (a) retry the entire operation, (b) retry trying to install now |
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1032 // or (c) just return obsv. We use (c). No loop is required although in some cases |
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1033 // we might discard a higher "now" value in deference to a slightly lower but freshly |
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1034 // installed obsv value. That's entirely benign -- it admits no new orderings compared |
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1035 // to (a) or (b) -- and greatly reduces coherence traffic. |
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1036 // We might also condition (c) on the magnitude of the delta between obsv and now. |
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1037 // Avoiding excessive CAS operations to hot RW locations is critical. |
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1038 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate |
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1039 return (prev == obsv) ? now : obsv; |
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1040 } |
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1041 |
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1042 #else // __APPLE__ |
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1043 |
3960 | 1044 jlong os::javaTimeNanos() { |
1045 if (Bsd::supports_monotonic_clock()) { | |
1046 struct timespec tp; | |
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1047 int status = Bsd::_clock_gettime(CLOCK_MONOTONIC, &tp); |
3960 | 1048 assert(status == 0, "gettime error"); |
1049 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1050 return result; | |
1051 } else { | |
1052 timeval time; | |
1053 int status = gettimeofday(&time, NULL); | |
1054 assert(status != -1, "bsd error"); | |
1055 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1056 return 1000 * usecs; | |
1057 } | |
1058 } | |
1059 | |
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1060 #endif // __APPLE__ |
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1061 |
3960 | 1062 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { |
1063 if (Bsd::supports_monotonic_clock()) { | |
1064 info_ptr->max_value = ALL_64_BITS; | |
1065 | |
1066 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1067 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1068 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1069 } else { | |
1070 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1071 info_ptr->max_value = ALL_64_BITS; | |
1072 | |
1073 // gettimeofday is a real time clock so it skips | |
1074 info_ptr->may_skip_backward = true; | |
1075 info_ptr->may_skip_forward = true; | |
1076 } | |
1077 | |
1078 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1079 } | |
1080 | |
1081 // Return the real, user, and system times in seconds from an | |
1082 // arbitrary fixed point in the past. | |
1083 bool os::getTimesSecs(double* process_real_time, | |
1084 double* process_user_time, | |
1085 double* process_system_time) { | |
1086 struct tms ticks; | |
1087 clock_t real_ticks = times(&ticks); | |
1088 | |
1089 if (real_ticks == (clock_t) (-1)) { | |
1090 return false; | |
1091 } else { | |
1092 double ticks_per_second = (double) clock_tics_per_sec; | |
1093 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1094 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1095 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1096 | |
1097 return true; | |
1098 } | |
1099 } | |
1100 | |
1101 | |
1102 char * os::local_time_string(char *buf, size_t buflen) { | |
1103 struct tm t; | |
1104 time_t long_time; | |
1105 time(&long_time); | |
1106 localtime_r(&long_time, &t); | |
1107 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1108 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1109 t.tm_hour, t.tm_min, t.tm_sec); | |
1110 return buf; | |
1111 } | |
1112 | |
1113 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
1114 return localtime_r(clock, res); | |
1115 } | |
1116 | |
1117 //////////////////////////////////////////////////////////////////////////////// | |
1118 // runtime exit support | |
1119 | |
1120 // Note: os::shutdown() might be called very early during initialization, or | |
1121 // called from signal handler. Before adding something to os::shutdown(), make | |
1122 // sure it is async-safe and can handle partially initialized VM. | |
1123 void os::shutdown() { | |
1124 | |
1125 // allow PerfMemory to attempt cleanup of any persistent resources | |
1126 perfMemory_exit(); | |
1127 | |
1128 // needs to remove object in file system | |
1129 AttachListener::abort(); | |
1130 | |
1131 // flush buffered output, finish log files | |
1132 ostream_abort(); | |
1133 | |
1134 // Check for abort hook | |
1135 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1136 if (abort_hook != NULL) { | |
1137 abort_hook(); | |
1138 } | |
1139 | |
1140 } | |
1141 | |
1142 // Note: os::abort() might be called very early during initialization, or | |
1143 // called from signal handler. Before adding something to os::abort(), make | |
1144 // sure it is async-safe and can handle partially initialized VM. | |
1145 void os::abort(bool dump_core) { | |
1146 os::shutdown(); | |
1147 if (dump_core) { | |
1148 #ifndef PRODUCT | |
1149 fdStream out(defaultStream::output_fd()); | |
1150 out.print_raw("Current thread is "); | |
1151 char buf[16]; | |
1152 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1153 out.print_raw_cr(buf); | |
1154 out.print_raw_cr("Dumping core ..."); | |
1155 #endif | |
1156 ::abort(); // dump core | |
1157 } | |
1158 | |
1159 ::exit(1); | |
1160 } | |
1161 | |
1162 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1163 void os::die() { | |
1164 // _exit() on BsdThreads only kills current thread | |
1165 ::abort(); | |
1166 } | |
1167 | |
1168 // unused on bsd for now. | |
1169 void os::set_error_file(const char *logfile) {} | |
1170 | |
1171 | |
1172 // This method is a copy of JDK's sysGetLastErrorString | |
1173 // from src/solaris/hpi/src/system_md.c | |
1174 | |
1175 size_t os::lasterror(char *buf, size_t len) { | |
1176 | |
1177 if (errno == 0) return 0; | |
1178 | |
1179 const char *s = ::strerror(errno); | |
1180 size_t n = ::strlen(s); | |
1181 if (n >= len) { | |
1182 n = len - 1; | |
1183 } | |
1184 ::strncpy(buf, s, n); | |
1185 buf[n] = '\0'; | |
1186 return n; | |
1187 } | |
1188 | |
12809
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1189 // Information of current thread in variety of formats |
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1190 pid_t os::Bsd::gettid() { |
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1191 int retval = -1; |
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1192 |
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1193 #ifdef __APPLE__ //XNU kernel |
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1194 // despite the fact mach port is actually not a thread id use it |
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1195 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 |
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1196 retval = ::pthread_mach_thread_np(::pthread_self()); |
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1197 guarantee(retval != 0, "just checking"); |
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1198 return retval; |
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|
1199 |
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1200 #elif __FreeBSD__ |
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1201 retval = syscall(SYS_thr_self); |
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1202 #elif __OpenBSD__ |
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1203 retval = syscall(SYS_getthrid); |
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1204 #elif __NetBSD__ |
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1205 retval = (pid_t) syscall(SYS__lwp_self); |
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1206 #endif |
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1207 |
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1208 if (retval == -1) { |
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1209 return getpid(); |
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|
1210 } |
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1211 } |
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1212 |
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1213 intx os::current_thread_id() { |
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1214 #ifdef __APPLE__ |
12095 | 1215 return (intx)::pthread_mach_thread_np(::pthread_self()); |
4961
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1216 #else |
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1217 return (intx)::pthread_self(); |
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1218 #endif |
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1219 } |
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1220 |
3960 | 1221 int os::current_process_id() { |
1222 | |
1223 // Under the old bsd thread library, bsd gives each thread | |
1224 // its own process id. Because of this each thread will return | |
1225 // a different pid if this method were to return the result | |
1226 // of getpid(2). Bsd provides no api that returns the pid | |
1227 // of the launcher thread for the vm. This implementation | |
1228 // returns a unique pid, the pid of the launcher thread | |
1229 // that starts the vm 'process'. | |
1230 | |
1231 // Under the NPTL, getpid() returns the same pid as the | |
1232 // launcher thread rather than a unique pid per thread. | |
1233 // Use gettid() if you want the old pre NPTL behaviour. | |
1234 | |
1235 // if you are looking for the result of a call to getpid() that | |
1236 // returns a unique pid for the calling thread, then look at the | |
1237 // OSThread::thread_id() method in osThread_bsd.hpp file | |
1238 | |
1239 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1240 } | |
1241 | |
1242 // DLL functions | |
1243 | |
1244 #define JNI_LIB_PREFIX "lib" | |
1245 #ifdef __APPLE__ | |
1246 #define JNI_LIB_SUFFIX ".dylib" | |
1247 #else | |
1248 #define JNI_LIB_SUFFIX ".so" | |
1249 #endif | |
1250 | |
1251 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
1252 | |
1253 // This must be hard coded because it's the system's temporary | |
1254 // directory not the java application's temp directory, ala java.io.tmpdir. | |
4006 | 1255 #ifdef __APPLE__ |
1256 // macosx has a secure per-user temporary directory | |
1257 char temp_path_storage[PATH_MAX]; | |
1258 const char* os::get_temp_directory() { | |
1259 static char *temp_path = NULL; | |
1260 if (temp_path == NULL) { | |
1261 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
1262 if (pathSize == 0 || pathSize > PATH_MAX) { | |
1263 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
1264 } | |
1265 temp_path = temp_path_storage; | |
1266 } | |
1267 return temp_path; | |
1268 } | |
1269 #else /* __APPLE__ */ | |
3960 | 1270 const char* os::get_temp_directory() { return "/tmp"; } |
4006 | 1271 #endif /* __APPLE__ */ |
3960 | 1272 |
1273 static bool file_exists(const char* filename) { | |
1274 struct stat statbuf; | |
1275 if (filename == NULL || strlen(filename) == 0) { | |
1276 return false; | |
1277 } | |
1278 return os::stat(filename, &statbuf) == 0; | |
1279 } | |
1280 | |
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1281 bool os::dll_build_name(char* buffer, size_t buflen, |
3960 | 1282 const char* pname, const char* fname) { |
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1283 bool retval = false; |
3960 | 1284 // Copied from libhpi |
1285 const size_t pnamelen = pname ? strlen(pname) : 0; | |
1286 | |
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1287 // Return error on buffer overflow. |
3960 | 1288 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1289 return retval; |
3960 | 1290 } |
1291 | |
1292 if (pnamelen == 0) { | |
1293 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1294 retval = true; |
3960 | 1295 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1296 int n; | |
1297 char** pelements = split_path(pname, &n); | |
9059
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1298 if (pelements == NULL) { |
9062 | 1299 return false; |
9059
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|
1300 } |
3960 | 1301 for (int i = 0 ; i < n ; i++) { |
1302 // Really shouldn't be NULL, but check can't hurt | |
1303 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1304 continue; // skip the empty path values | |
1305 } | |
1306 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
1307 pelements[i], fname); | |
1308 if (file_exists(buffer)) { | |
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1309 retval = true; |
3960 | 1310 break; |
1311 } | |
1312 } | |
1313 // release the storage | |
1314 for (int i = 0 ; i < n ; i++) { | |
1315 if (pelements[i] != NULL) { | |
6197 | 1316 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
3960 | 1317 } |
1318 } | |
1319 if (pelements != NULL) { | |
6197 | 1320 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
3960 | 1321 } |
1322 } else { | |
1323 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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1324 retval = true; |
3960 | 1325 } |
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1326 return retval; |
3960 | 1327 } |
1328 | |
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1329 // check if addr is inside libjvm.so |
3960 | 1330 bool os::address_is_in_vm(address addr) { |
1331 static address libjvm_base_addr; | |
1332 Dl_info dlinfo; | |
1333 | |
1334 if (libjvm_base_addr == NULL) { | |
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1335 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
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1336 libjvm_base_addr = (address)dlinfo.dli_fbase; |
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1337 } |
3960 | 1338 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
1339 } | |
1340 | |
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1341 if (dladdr((void *)addr, &dlinfo) != 0) { |
3960 | 1342 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
1343 } | |
1344 | |
1345 return false; | |
1346 } | |
1347 | |
6258 | 1348 |
1349 #define MACH_MAXSYMLEN 256 | |
1350 | |
3960 | 1351 bool os::dll_address_to_function_name(address addr, char *buf, |
1352 int buflen, int *offset) { | |
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1353 // buf is not optional, but offset is optional |
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1354 assert(buf != NULL, "sanity check"); |
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1355 |
3960 | 1356 Dl_info dlinfo; |
6258 | 1357 char localbuf[MACH_MAXSYMLEN]; |
1358 | |
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1359 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1360 // see if we have a matching symbol |
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1361 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
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1362 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
3960 | 1363 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
1364 } | |
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1365 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
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1366 return true; |
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|
1367 } |
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1368 // no matching symbol so try for just file info |
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1369 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
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1370 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
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1371 buf, buflen, offset, dlinfo.dli_fname)) { |
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1372 return true; |
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|
1373 } |
3960 | 1374 } |
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1375 |
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1376 // Handle non-dynamic manually: |
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1377 if (dlinfo.dli_fbase != NULL && |
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1378 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, |
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1379 dlinfo.dli_fbase)) { |
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1380 if (!Decoder::demangle(localbuf, buf, buflen)) { |
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1381 jio_snprintf(buf, buflen, "%s", localbuf); |
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1382 } |
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1383 return true; |
3960 | 1384 } |
1385 } | |
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|
1386 buf[0] = '\0'; |
3960 | 1387 if (offset != NULL) *offset = -1; |
1388 return false; | |
1389 } | |
1390 | |
1391 // ported from solaris version | |
1392 bool os::dll_address_to_library_name(address addr, char* buf, | |
1393 int buflen, int* offset) { | |
11092
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1394 // buf is not optional, but offset is optional |
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|
1395 assert(buf != NULL, "sanity check"); |
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|
1396 |
3960 | 1397 Dl_info dlinfo; |
1398 | |
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1399 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1400 if (dlinfo.dli_fname != NULL) { |
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|
1401 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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|
1402 } |
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|
1403 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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|
1404 *offset = addr - (address)dlinfo.dli_fbase; |
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|
1405 } |
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|
1406 return true; |
3960 | 1407 } |
11092
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|
1408 |
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|
1409 buf[0] = '\0'; |
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|
1410 if (offset) *offset = -1; |
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|
1411 return false; |
3960 | 1412 } |
6918 | 1413 |
1414 // Loads .dll/.so and | |
1415 // in case of error it checks if .dll/.so was built for the | |
1416 // same architecture as Hotspot is running on | |
3960 | 1417 |
1418 #ifdef __APPLE__ | |
1419 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
1420 void * result= ::dlopen(filename, RTLD_LAZY); | |
1421 if (result != NULL) { | |
1422 // Successful loading | |
1423 return result; | |
1424 } | |
1425 | |
1426 // Read system error message into ebuf | |
1427 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1428 ebuf[ebuflen-1]='\0'; | |
1429 | |
1430 return NULL; | |
1431 } | |
1432 #else | |
1433 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
1434 { | |
1435 void * result= ::dlopen(filename, RTLD_LAZY); | |
1436 if (result != NULL) { | |
1437 // Successful loading | |
1438 return result; | |
1439 } | |
1440 | |
1441 Elf32_Ehdr elf_head; | |
1442 | |
1443 // Read system error message into ebuf | |
1444 // It may or may not be overwritten below | |
1445 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1446 ebuf[ebuflen-1]='\0'; | |
1447 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1448 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1449 | |
1450 if (diag_msg_max_length==0) { | |
1451 // No more space in ebuf for additional diagnostics message | |
1452 return NULL; | |
1453 } | |
1454 | |
1455 | |
1456 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1457 | |
1458 if (file_descriptor < 0) { | |
1459 // Can't open library, report dlerror() message | |
1460 return NULL; | |
1461 } | |
1462 | |
1463 bool failed_to_read_elf_head= | |
1464 (sizeof(elf_head)!= | |
1465 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1466 | |
1467 ::close(file_descriptor); | |
1468 if (failed_to_read_elf_head) { | |
1469 // file i/o error - report dlerror() msg | |
1470 return NULL; | |
1471 } | |
1472 | |
1473 typedef struct { | |
1474 Elf32_Half code; // Actual value as defined in elf.h | |
1475 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1476 char elf_class; // 32 or 64 bit | |
1477 char endianess; // MSB or LSB | |
1478 char* name; // String representation | |
1479 } arch_t; | |
1480 | |
1481 #ifndef EM_486 | |
1482 #define EM_486 6 /* Intel 80486 */ | |
1483 #endif | |
1484 | |
1485 #ifndef EM_MIPS_RS3_LE | |
1486 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
1487 #endif | |
1488 | |
1489 #ifndef EM_PPC64 | |
1490 #define EM_PPC64 21 /* PowerPC64 */ | |
1491 #endif | |
1492 | |
1493 #ifndef EM_S390 | |
1494 #define EM_S390 22 /* IBM System/390 */ | |
1495 #endif | |
1496 | |
1497 #ifndef EM_IA_64 | |
1498 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
1499 #endif | |
1500 | |
1501 #ifndef EM_X86_64 | |
1502 #define EM_X86_64 62 /* AMD x86-64 */ | |
1503 #endif | |
1504 | |
1505 static const arch_t arch_array[]={ | |
1506 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1507 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1508 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1509 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1510 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1511 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1512 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1513 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1514 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
1515 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1516 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1517 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1518 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1519 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1520 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1521 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
1522 }; | |
1523 | |
1524 #if (defined IA32) | |
1525 static Elf32_Half running_arch_code=EM_386; | |
1526 #elif (defined AMD64) | |
1527 static Elf32_Half running_arch_code=EM_X86_64; | |
1528 #elif (defined IA64) | |
1529 static Elf32_Half running_arch_code=EM_IA_64; | |
1530 #elif (defined __sparc) && (defined _LP64) | |
1531 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1532 #elif (defined __sparc) && (!defined _LP64) | |
1533 static Elf32_Half running_arch_code=EM_SPARC; | |
1534 #elif (defined __powerpc64__) | |
1535 static Elf32_Half running_arch_code=EM_PPC64; | |
1536 #elif (defined __powerpc__) | |
1537 static Elf32_Half running_arch_code=EM_PPC; | |
1538 #elif (defined ARM) | |
1539 static Elf32_Half running_arch_code=EM_ARM; | |
1540 #elif (defined S390) | |
1541 static Elf32_Half running_arch_code=EM_S390; | |
1542 #elif (defined ALPHA) | |
1543 static Elf32_Half running_arch_code=EM_ALPHA; | |
1544 #elif (defined MIPSEL) | |
1545 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1546 #elif (defined PARISC) | |
1547 static Elf32_Half running_arch_code=EM_PARISC; | |
1548 #elif (defined MIPS) | |
1549 static Elf32_Half running_arch_code=EM_MIPS; | |
1550 #elif (defined M68K) | |
1551 static Elf32_Half running_arch_code=EM_68K; | |
1552 #else | |
1553 #error Method os::dll_load requires that one of following is defined:\ | |
1554 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
1555 #endif | |
1556 | |
1557 // Identify compatability class for VM's architecture and library's architecture | |
1558 // Obtain string descriptions for architectures | |
1559 | |
1560 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1561 int running_arch_index=-1; | |
1562 | |
1563 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1564 if (running_arch_code == arch_array[i].code) { | |
1565 running_arch_index = i; | |
1566 } | |
1567 if (lib_arch.code == arch_array[i].code) { | |
1568 lib_arch.compat_class = arch_array[i].compat_class; | |
1569 lib_arch.name = arch_array[i].name; | |
1570 } | |
1571 } | |
1572 | |
1573 assert(running_arch_index != -1, | |
1574 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1575 if (running_arch_index == -1) { | |
1576 // Even though running architecture detection failed | |
1577 // we may still continue with reporting dlerror() message | |
1578 return NULL; | |
1579 } | |
1580 | |
1581 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1582 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1583 return NULL; | |
1584 } | |
1585 | |
1586 #ifndef S390 | |
1587 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
1588 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1589 return NULL; | |
1590 } | |
1591 #endif // !S390 | |
1592 | |
1593 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1594 if ( lib_arch.name!=NULL ) { | |
1595 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1596 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1597 lib_arch.name, arch_array[running_arch_index].name); | |
1598 } else { | |
1599 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1600 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1601 lib_arch.code, | |
1602 arch_array[running_arch_index].name); | |
1603 } | |
1604 } | |
1605 | |
1606 return NULL; | |
1607 } | |
1608 #endif /* !__APPLE__ */ | |
1609 | |
17684
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|
1610 void* os::get_default_process_handle() { |
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|
1611 #ifdef __APPLE__ |
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|
1612 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY |
d1621038becf
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|
1613 // to avoid finding unexpected symbols on second (or later) |
d1621038becf
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|
1614 // loads of a library. |
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|
1615 return (void*)::dlopen(NULL, RTLD_FIRST); |
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|
1616 #else |
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|
1617 return (void*)::dlopen(NULL, RTLD_LAZY); |
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|
1618 #endif |
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|
1619 } |
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|
1620 |
3960 | 1621 // XXX: Do we need a lock around this as per Linux? |
1622 void* os::dll_lookup(void* handle, const char* name) { | |
1623 return dlsym(handle, name); | |
1624 } | |
1625 | |
1626 | |
1627 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
1628 int fd = ::open(filename, O_RDONLY); | |
1629 if (fd == -1) { | |
1630 return false; | |
1631 } | |
1632 | |
1633 char buf[32]; | |
1634 int bytes; | |
1635 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
1636 st->print_raw(buf, bytes); | |
1637 } | |
1638 | |
1639 ::close(fd); | |
1640 | |
1641 return true; | |
1642 } | |
1643 | |
1644 void os::print_dll_info(outputStream *st) { | |
11092
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|
1645 st->print_cr("Dynamic libraries:"); |
3960 | 1646 #ifdef RTLD_DI_LINKMAP |
11092
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|
1647 Dl_info dli; |
59b052799158
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|
1648 void *handle; |
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|
1649 Link_map *map; |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1650 Link_map *p; |
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|
1651 |
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|
1652 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || |
59b052799158
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|
1653 dli.dli_fname == NULL) { |
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dcubed
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|
1654 st->print_cr("Error: Cannot print dynamic libraries."); |
59b052799158
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|
1655 return; |
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|
1656 } |
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|
1657 handle = dlopen(dli.dli_fname, RTLD_LAZY); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1658 if (handle == NULL) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
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|
1659 st->print_cr("Error: Cannot print dynamic libraries."); |
59b052799158
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|
1660 return; |
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|
1661 } |
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|
1662 dlinfo(handle, RTLD_DI_LINKMAP, &map); |
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|
1663 if (map == NULL) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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changeset
|
1664 st->print_cr("Error: Cannot print dynamic libraries."); |
59b052799158
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|
1665 return; |
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diff
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|
1666 } |
59b052799158
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|
1667 |
59b052799158
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|
1668 while (map->l_prev != NULL) |
59b052799158
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|
1669 map = map->l_prev; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1670 |
59b052799158
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|
1671 while (map != NULL) { |
59b052799158
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|
1672 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); |
59b052799158
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|
1673 map = map->l_next; |
59b052799158
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|
1674 } |
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|
1675 |
59b052799158
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|
1676 dlclose(handle); |
3960 | 1677 #elif defined(__APPLE__) |
11092
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|
1678 uint32_t count; |
59b052799158
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|
1679 uint32_t i; |
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|
1680 |
59b052799158
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|
1681 count = _dyld_image_count(); |
59b052799158
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|
1682 for (i = 1; i < count; i++) { |
59b052799158
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|
1683 const char *name = _dyld_get_image_name(i); |
59b052799158
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|
1684 intptr_t slide = _dyld_get_image_vmaddr_slide(i); |
59b052799158
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changeset
|
1685 st->print_cr(PTR_FORMAT " \t%s", slide, name); |
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|
1686 } |
3960 | 1687 #else |
11092
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1688 st->print_cr("Error: Cannot print dynamic libraries."); |
3960 | 1689 #endif |
1690 } | |
1691 | |
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1692 void os::print_os_info_brief(outputStream* st) { |
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1693 st->print("Bsd"); |
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1694 |
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1695 os::Posix::print_uname_info(st); |
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1696 } |
3960 | 1697 |
1698 void os::print_os_info(outputStream* st) { | |
1699 st->print("OS:"); | |
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1700 st->print("Bsd"); |
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1701 |
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1702 os::Posix::print_uname_info(st); |
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1703 |
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1704 os::Posix::print_rlimit_info(st); |
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1705 |
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1706 os::Posix::print_load_average(st); |
3960 | 1707 } |
1708 | |
1709 void os::pd_print_cpu_info(outputStream* st) { | |
1710 // Nothing to do for now. | |
1711 } | |
1712 | |
1713 void os::print_memory_info(outputStream* st) { | |
1714 | |
1715 st->print("Memory:"); | |
1716 st->print(" %dk page", os::vm_page_size()>>10); | |
1717 | |
1718 st->print(", physical " UINT64_FORMAT "k", | |
1719 os::physical_memory() >> 10); | |
1720 st->print("(" UINT64_FORMAT "k free)", | |
1721 os::available_memory() >> 10); | |
1722 st->cr(); | |
1723 | |
1724 // meminfo | |
1725 st->print("\n/proc/meminfo:\n"); | |
1726 _print_ascii_file("/proc/meminfo", st); | |
1727 st->cr(); | |
1728 } | |
1729 | |
1730 void os::print_siginfo(outputStream* st, void* siginfo) { | |
14410 | 1731 const siginfo_t* si = (const siginfo_t*)siginfo; |
1732 | |
1733 os::Posix::print_siginfo_brief(st, si); | |
1734 | |
1735 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
3960 | 1736 UseSharedSpaces) { |
1737 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
1738 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
1739 st->print("\n\nError accessing class data sharing archive." \ | |
1740 " Mapped file inaccessible during execution, " \ | |
1741 " possible disk/network problem."); | |
1742 } | |
1743 } | |
1744 st->cr(); | |
1745 } | |
1746 | |
1747 | |
1748 static void print_signal_handler(outputStream* st, int sig, | |
1749 char* buf, size_t buflen); | |
1750 | |
1751 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
1752 st->print_cr("Signal Handlers:"); | |
1753 print_signal_handler(st, SIGSEGV, buf, buflen); | |
1754 print_signal_handler(st, SIGBUS , buf, buflen); | |
1755 print_signal_handler(st, SIGFPE , buf, buflen); | |
1756 print_signal_handler(st, SIGPIPE, buf, buflen); | |
1757 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
1758 print_signal_handler(st, SIGILL , buf, buflen); | |
1759 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
1760 print_signal_handler(st, SR_signum, buf, buflen); | |
1761 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
1762 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
1763 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
1764 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
1765 } | |
1766 | |
1767 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
1768 | |
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1769 // Find the full path to the current module, libjvm |
3960 | 1770 void os::jvm_path(char *buf, jint buflen) { |
1771 // Error checking. | |
1772 if (buflen < MAXPATHLEN) { | |
1773 assert(false, "must use a large-enough buffer"); | |
1774 buf[0] = '\0'; | |
1775 return; | |
1776 } | |
1777 // Lazy resolve the path to current module. | |
1778 if (saved_jvm_path[0] != 0) { | |
1779 strcpy(buf, saved_jvm_path); | |
1780 return; | |
1781 } | |
1782 | |
1783 char dli_fname[MAXPATHLEN]; | |
1784 bool ret = dll_address_to_library_name( | |
1785 CAST_FROM_FN_PTR(address, os::jvm_path), | |
1786 dli_fname, sizeof(dli_fname), NULL); | |
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1787 assert(ret, "cannot locate libjvm"); |
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1788 char *rp = NULL; |
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1789 if (ret && dli_fname[0] != '\0') { |
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1790 rp = realpath(dli_fname, buf); |
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1791 } |
3960 | 1792 if (rp == NULL) |
1793 return; | |
1794 | |
1795 if (Arguments::created_by_gamma_launcher()) { | |
1796 // Support for the gamma launcher. Typical value for buf is | |
4846 | 1797 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
3960 | 1798 // the right place in the string, then assume we are installed in a JDK and |
4846 | 1799 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
1800 // construct a path to the JVM being overridden. | |
1801 | |
3960 | 1802 const char *p = buf + strlen(buf) - 1; |
1803 for (int count = 0; p > buf && count < 5; ++count) { | |
1804 for (--p; p > buf && *p != '/'; --p) | |
1805 /* empty */ ; | |
1806 } | |
1807 | |
1808 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
1809 // Look for JAVA_HOME in the environment. | |
1810 char* java_home_var = ::getenv("JAVA_HOME"); | |
1811 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1812 char* jrelib_p; | |
1813 int len; | |
1814 | |
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1815 // Check the current module name "libjvm" |
3960 | 1816 p = strrchr(buf, '/'); |
1817 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
1818 | |
1819 rp = realpath(java_home_var, buf); | |
1820 if (rp == NULL) | |
1821 return; | |
1822 | |
1823 // determine if this is a legacy image or modules image | |
1824 // modules image doesn't have "jre" subdirectory | |
1825 len = strlen(buf); | |
1826 jrelib_p = buf + len; | |
4846 | 1827 |
1828 // Add the appropriate library subdir | |
1829 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
3960 | 1830 if (0 != access(buf, F_OK)) { |
4846 | 1831 snprintf(jrelib_p, buflen-len, "/lib"); |
3960 | 1832 } |
1833 | |
4846 | 1834 // Add the appropriate client or server subdir |
1835 len = strlen(buf); | |
1836 jrelib_p = buf + len; | |
1837 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
1838 if (0 != access(buf, F_OK)) { | |
1839 snprintf(jrelib_p, buflen-len, ""); | |
1840 } | |
1841 | |
1842 // If the path exists within JAVA_HOME, add the JVM library name | |
1843 // to complete the path to JVM being overridden. Otherwise fallback | |
1844 // to the path to the current library. | |
3960 | 1845 if (0 == access(buf, F_OK)) { |
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1846 // Use current module name "libjvm" |
3960 | 1847 len = strlen(buf); |
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1848 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
3960 | 1849 } else { |
4846 | 1850 // Fall back to path of current library |
3960 | 1851 rp = realpath(dli_fname, buf); |
1852 if (rp == NULL) | |
1853 return; | |
1854 } | |
1855 } | |
1856 } | |
1857 } | |
1858 | |
1859 strcpy(saved_jvm_path, buf); | |
1860 } | |
1861 | |
1862 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
1863 // no prefix required, not even "_" | |
1864 } | |
1865 | |
1866 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
1867 // no suffix required | |
1868 } | |
1869 | |
1870 //////////////////////////////////////////////////////////////////////////////// | |
1871 // sun.misc.Signal support | |
1872 | |
1873 static volatile jint sigint_count = 0; | |
1874 | |
1875 static void | |
1876 UserHandler(int sig, void *siginfo, void *context) { | |
1877 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
1878 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
1879 // don't want to flood the manager thread with sem_post requests. | |
1880 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
1881 return; | |
1882 | |
1883 // Ctrl-C is pressed during error reporting, likely because the error | |
1884 // handler fails to abort. Let VM die immediately. | |
1885 if (sig == SIGINT && is_error_reported()) { | |
1886 os::die(); | |
1887 } | |
1888 | |
1889 os::signal_notify(sig); | |
1890 } | |
1891 | |
1892 void* os::user_handler() { | |
1893 return CAST_FROM_FN_PTR(void*, UserHandler); | |
1894 } | |
1895 | |
1896 extern "C" { | |
1897 typedef void (*sa_handler_t)(int); | |
1898 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
1899 } | |
1900 | |
1901 void* os::signal(int signal_number, void* handler) { | |
1902 struct sigaction sigAct, oldSigAct; | |
1903 | |
1904 sigfillset(&(sigAct.sa_mask)); | |
1905 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
1906 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
1907 | |
1908 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
1909 // -1 means registration failed | |
1910 return (void *)-1; | |
1911 } | |
1912 | |
1913 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
1914 } | |
1915 | |
1916 void os::signal_raise(int signal_number) { | |
1917 ::raise(signal_number); | |
1918 } | |
1919 | |
1920 /* | |
1921 * The following code is moved from os.cpp for making this | |
1922 * code platform specific, which it is by its very nature. | |
1923 */ | |
1924 | |
1925 // Will be modified when max signal is changed to be dynamic | |
1926 int os::sigexitnum_pd() { | |
1927 return NSIG; | |
1928 } | |
1929 | |
1930 // a counter for each possible signal value | |
1931 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
1932 | |
1933 // Bsd(POSIX) specific hand shaking semaphore. | |
1934 #ifdef __APPLE__ | |
10405 | 1935 typedef semaphore_t os_semaphore_t; |
3960 | 1936 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) |
10405 | 1937 #define SEM_WAIT(sem) semaphore_wait(sem) |
1938 #define SEM_POST(sem) semaphore_signal(sem) | |
1939 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) | |
3960 | 1940 #else |
10405 | 1941 typedef sem_t os_semaphore_t; |
3960 | 1942 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) |
10405 | 1943 #define SEM_WAIT(sem) sem_wait(&sem) |
1944 #define SEM_POST(sem) sem_post(&sem) | |
1945 #define SEM_DESTROY(sem) sem_destroy(&sem) | |
3960 | 1946 #endif |
1947 | |
10405 | 1948 class Semaphore : public StackObj { |
1949 public: | |
1950 Semaphore(); | |
1951 ~Semaphore(); | |
1952 void signal(); | |
1953 void wait(); | |
1954 bool trywait(); | |
1955 bool timedwait(unsigned int sec, int nsec); | |
1956 private: | |
1957 jlong currenttime() const; | |
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1958 os_semaphore_t _semaphore; |
10405 | 1959 }; |
1960 | |
1961 Semaphore::Semaphore() : _semaphore(0) { | |
1962 SEM_INIT(_semaphore, 0); | |
1963 } | |
1964 | |
1965 Semaphore::~Semaphore() { | |
1966 SEM_DESTROY(_semaphore); | |
1967 } | |
1968 | |
1969 void Semaphore::signal() { | |
1970 SEM_POST(_semaphore); | |
1971 } | |
1972 | |
1973 void Semaphore::wait() { | |
1974 SEM_WAIT(_semaphore); | |
1975 } | |
1976 | |
1977 jlong Semaphore::currenttime() const { | |
1978 struct timeval tv; | |
1979 gettimeofday(&tv, NULL); | |
1980 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); | |
1981 } | |
1982 | |
1983 #ifdef __APPLE__ | |
1984 bool Semaphore::trywait() { | |
1985 return timedwait(0, 0); | |
1986 } | |
1987 | |
1988 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
1989 kern_return_t kr = KERN_ABORTED; | |
1990 mach_timespec_t waitspec; | |
1991 waitspec.tv_sec = sec; | |
1992 waitspec.tv_nsec = nsec; | |
1993 | |
1994 jlong starttime = currenttime(); | |
1995 | |
1996 kr = semaphore_timedwait(_semaphore, waitspec); | |
1997 while (kr == KERN_ABORTED) { | |
1998 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; | |
1999 | |
2000 jlong current = currenttime(); | |
2001 jlong passedtime = current - starttime; | |
2002 | |
2003 if (passedtime >= totalwait) { | |
2004 waitspec.tv_sec = 0; | |
2005 waitspec.tv_nsec = 0; | |
2006 } else { | |
2007 jlong waittime = totalwait - (current - starttime); | |
2008 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; | |
2009 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; | |
2010 } | |
2011 | |
2012 kr = semaphore_timedwait(_semaphore, waitspec); | |
2013 } | |
2014 | |
2015 return kr == KERN_SUCCESS; | |
2016 } | |
2017 | |
2018 #else | |
2019 | |
2020 bool Semaphore::trywait() { | |
2021 return sem_trywait(&_semaphore) == 0; | |
2022 } | |
2023 | |
2024 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
2025 struct timespec ts; | |
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2026 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); |
10405 | 2027 |
2028 while (1) { | |
2029 int result = sem_timedwait(&_semaphore, &ts); | |
2030 if (result == 0) { | |
2031 return true; | |
2032 } else if (errno == EINTR) { | |
2033 continue; | |
2034 } else if (errno == ETIMEDOUT) { | |
2035 return false; | |
2036 } else { | |
2037 return false; | |
2038 } | |
2039 } | |
2040 } | |
2041 | |
2042 #endif // __APPLE__ | |
2043 | |
2044 static os_semaphore_t sig_sem; | |
2045 static Semaphore sr_semaphore; | |
2046 | |
3960 | 2047 void os::signal_init_pd() { |
2048 // Initialize signal structures | |
2049 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2050 | |
2051 // Initialize signal semaphore | |
2052 ::SEM_INIT(sig_sem, 0); | |
2053 } | |
2054 | |
2055 void os::signal_notify(int sig) { | |
2056 Atomic::inc(&pending_signals[sig]); | |
2057 ::SEM_POST(sig_sem); | |
2058 } | |
2059 | |
2060 static int check_pending_signals(bool wait) { | |
2061 Atomic::store(0, &sigint_count); | |
2062 for (;;) { | |
2063 for (int i = 0; i < NSIG + 1; i++) { | |
2064 jint n = pending_signals[i]; | |
2065 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2066 return i; | |
2067 } | |
2068 } | |
2069 if (!wait) { | |
2070 return -1; | |
2071 } | |
2072 JavaThread *thread = JavaThread::current(); | |
2073 ThreadBlockInVM tbivm(thread); | |
2074 | |
2075 bool threadIsSuspended; | |
2076 do { | |
2077 thread->set_suspend_equivalent(); | |
2078 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2079 ::SEM_WAIT(sig_sem); | |
2080 | |
2081 // were we externally suspended while we were waiting? | |
2082 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2083 if (threadIsSuspended) { | |
2084 // | |
2085 // The semaphore has been incremented, but while we were waiting | |
2086 // another thread suspended us. We don't want to continue running | |
2087 // while suspended because that would surprise the thread that | |
2088 // suspended us. | |
2089 // | |
2090 ::SEM_POST(sig_sem); | |
2091 | |
2092 thread->java_suspend_self(); | |
2093 } | |
2094 } while (threadIsSuspended); | |
2095 } | |
2096 } | |
2097 | |
2098 int os::signal_lookup() { | |
2099 return check_pending_signals(false); | |
2100 } | |
2101 | |
2102 int os::signal_wait() { | |
2103 return check_pending_signals(true); | |
2104 } | |
2105 | |
2106 //////////////////////////////////////////////////////////////////////////////// | |
2107 // Virtual Memory | |
2108 | |
2109 int os::vm_page_size() { | |
2110 // Seems redundant as all get out | |
2111 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
2112 return os::Bsd::page_size(); | |
2113 } | |
2114 | |
2115 // Solaris allocates memory by pages. | |
2116 int os::vm_allocation_granularity() { | |
2117 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
2118 return os::Bsd::page_size(); | |
2119 } | |
2120 | |
2121 // Rationale behind this function: | |
2122 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2123 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2124 // samples for JITted code. Here we create private executable mapping over the code cache | |
2125 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2126 // info for the reporting script by storing timestamp and location of symbol | |
2127 void bsd_wrap_code(char* base, size_t size) { | |
2128 static volatile jint cnt = 0; | |
2129 | |
2130 if (!UseOprofile) { | |
2131 return; | |
2132 } | |
2133 | |
2134 char buf[PATH_MAX + 1]; | |
2135 int num = Atomic::add(1, &cnt); | |
2136 | |
2137 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
2138 os::get_temp_directory(), os::current_process_id(), num); | |
2139 unlink(buf); | |
2140 | |
2141 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
2142 | |
2143 if (fd != -1) { | |
2144 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
2145 if (rv != (off_t)-1) { | |
2146 if (::write(fd, "", 1) == 1) { | |
2147 mmap(base, size, | |
2148 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2149 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2150 } | |
2151 } | |
2152 ::close(fd); | |
2153 unlink(buf); | |
2154 } | |
2155 } | |
2156 | |
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2157 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
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2158 int err) { |
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2159 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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|
2160 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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2161 strerror(err), err); |
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2162 } |
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2163 |
3960 | 2164 // NOTE: Bsd kernel does not really reserve the pages for us. |
2165 // All it does is to check if there are enough free pages | |
2166 // left at the time of mmap(). This could be a potential | |
2167 // problem. | |
6197 | 2168 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
3960 | 2169 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2170 #ifdef __OpenBSD__ | |
2171 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
10969
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2172 if (::mprotect(addr, size, prot) == 0) { |
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2173 return true; |
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2174 } |
3960 | 2175 #else |
2176 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
2177 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
10969
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2178 if (res != (uintptr_t) MAP_FAILED) { |
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2179 return true; |
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2180 } |
3960 | 2181 #endif |
10969
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2182 |
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2183 // Warn about any commit errors we see in non-product builds just |
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2184 // in case mmap() doesn't work as described on the man page. |
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2185 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) |
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2186 |
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2187 return false; |
3960 | 2188 } |
2189 | |
6197 | 2190 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
3960 | 2191 bool exec) { |
10969
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2192 // alignment_hint is ignored on this OS |
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2193 return pd_commit_memory(addr, size, exec); |
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2194 } |
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2195 |
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2196 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
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2197 const char* mesg) { |
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2198 assert(mesg != NULL, "mesg must be specified"); |
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2199 if (!pd_commit_memory(addr, size, exec)) { |
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2200 // add extra info in product mode for vm_exit_out_of_memory(): |
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2201 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) |
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2202 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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2203 } |
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2204 } |
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2205 |
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2206 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
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2207 size_t alignment_hint, bool exec, |
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2208 const char* mesg) { |
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2209 // alignment_hint is ignored on this OS |
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2210 pd_commit_memory_or_exit(addr, size, exec, mesg); |
3960 | 2211 } |
2212 | |
6197 | 2213 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2214 } |
2215 | |
6197 | 2216 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2217 ::madvise(addr, bytes, MADV_DONTNEED); |
2218 } | |
2219 | |
2220 void os::numa_make_global(char *addr, size_t bytes) { | |
2221 } | |
2222 | |
2223 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2224 } | |
2225 | |
2226 bool os::numa_topology_changed() { return false; } | |
2227 | |
2228 size_t os::numa_get_groups_num() { | |
2229 return 1; | |
2230 } | |
2231 | |
2232 int os::numa_get_group_id() { | |
2233 return 0; | |
2234 } | |
2235 | |
2236 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
2237 if (size > 0) { | |
2238 ids[0] = 0; | |
2239 return 1; | |
2240 } | |
2241 return 0; | |
2242 } | |
2243 | |
2244 bool os::get_page_info(char *start, page_info* info) { | |
2245 return false; | |
2246 } | |
2247 | |
2248 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2249 return end; | |
2250 } | |
2251 | |
2252 | |
6197 | 2253 bool os::pd_uncommit_memory(char* addr, size_t size) { |
3960 | 2254 #ifdef __OpenBSD__ |
2255 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
2256 return ::mprotect(addr, size, PROT_NONE) == 0; | |
2257 #else | |
2258 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
2259 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
2260 return res != (uintptr_t) MAP_FAILED; | |
2261 #endif | |
2262 } | |
2263 | |
6197 | 2264 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
10969
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2265 return os::commit_memory(addr, size, !ExecMem); |
3960 | 2266 } |
2267 | |
2268 // If this is a growable mapping, remove the guard pages entirely by | |
2269 // munmap()ping them. If not, just call uncommit_memory(). | |
2270 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
2271 return os::uncommit_memory(addr, size); | |
2272 } | |
2273 | |
2274 static address _highest_vm_reserved_address = NULL; | |
2275 | |
2276 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2277 // at 'requested_addr'. If there are existing memory mappings at the same | |
2278 // location, however, they will be overwritten. If 'fixed' is false, | |
2279 // 'requested_addr' is only treated as a hint, the return value may or | |
2280 // may not start from the requested address. Unlike Bsd mmap(), this | |
2281 // function returns NULL to indicate failure. | |
2282 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2283 char * addr; | |
2284 int flags; | |
2285 | |
2286 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2287 if (fixed) { | |
2288 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
2289 flags |= MAP_FIXED; | |
2290 } | |
2291 | |
10157 | 2292 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
2293 // touch an uncommitted page. Otherwise, the read/write might | |
2294 // succeed if we have enough swap space to back the physical page. | |
2295 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
3960 | 2296 flags, -1, 0); |
2297 | |
2298 if (addr != MAP_FAILED) { | |
2299 // anon_mmap() should only get called during VM initialization, | |
2300 // don't need lock (actually we can skip locking even it can be called | |
2301 // from multiple threads, because _highest_vm_reserved_address is just a | |
2302 // hint about the upper limit of non-stack memory regions.) | |
2303 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2304 _highest_vm_reserved_address = (address)addr + bytes; | |
2305 } | |
2306 } | |
2307 | |
2308 return addr == MAP_FAILED ? NULL : addr; | |
2309 } | |
2310 | |
2311 // Don't update _highest_vm_reserved_address, because there might be memory | |
2312 // regions above addr + size. If so, releasing a memory region only creates | |
2313 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2314 // | |
2315 static int anon_munmap(char * addr, size_t size) { | |
2316 return ::munmap(addr, size) == 0; | |
2317 } | |
2318 | |
6197 | 2319 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
3960 | 2320 size_t alignment_hint) { |
2321 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2322 } | |
2323 | |
6197 | 2324 bool os::pd_release_memory(char* addr, size_t size) { |
3960 | 2325 return anon_munmap(addr, size); |
2326 } | |
2327 | |
2328 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
2329 // Bsd wants the mprotect address argument to be page aligned. | |
2330 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
2331 | |
2332 // According to SUSv3, mprotect() should only be used with mappings | |
2333 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2334 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2335 // protection of malloc'ed or statically allocated memory). Check the | |
2336 // caller if you hit this assert. | |
2337 assert(addr == bottom, "sanity check"); | |
2338 | |
2339 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
2340 return ::mprotect(bottom, size, prot) == 0; | |
2341 } | |
2342 | |
2343 // Set protections specified | |
2344 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
2345 bool is_committed) { | |
2346 unsigned int p = 0; | |
2347 switch (prot) { | |
2348 case MEM_PROT_NONE: p = PROT_NONE; break; | |
2349 case MEM_PROT_READ: p = PROT_READ; break; | |
2350 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
2351 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
2352 default: | |
2353 ShouldNotReachHere(); | |
2354 } | |
2355 // is_committed is unused. | |
2356 return bsd_mprotect(addr, bytes, p); | |
2357 } | |
2358 | |
2359 bool os::guard_memory(char* addr, size_t size) { | |
2360 return bsd_mprotect(addr, size, PROT_NONE); | |
2361 } | |
2362 | |
2363 bool os::unguard_memory(char* addr, size_t size) { | |
2364 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
2365 } | |
2366 | |
2367 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
6918 | 2368 return false; |
3960 | 2369 } |
2370 | |
2371 // Large page support | |
2372 | |
2373 static size_t _large_page_size = 0; | |
2374 | |
2375 void os::large_page_init() { | |
2376 } | |
2377 | |
2378 | |
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2379 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
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2380 fatal("This code is not used or maintained."); |
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2381 |
3960 | 2382 // "exec" is passed in but not used. Creating the shared image for |
2383 // the code cache doesn't have an SHM_X executable permission to check. | |
2384 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
2385 | |
2386 key_t key = IPC_PRIVATE; | |
2387 char *addr; | |
2388 | |
2389 bool warn_on_failure = UseLargePages && | |
2390 (!FLAG_IS_DEFAULT(UseLargePages) || | |
2391 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
2392 ); | |
2393 char msg[128]; | |
2394 | |
2395 // Create a large shared memory region to attach to based on size. | |
2396 // Currently, size is the total size of the heap | |
2397 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
2398 if (shmid == -1) { | |
2399 // Possible reasons for shmget failure: | |
2400 // 1. shmmax is too small for Java heap. | |
2401 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
2402 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
2403 // 2. not enough large page memory. | |
2404 // > check available large pages: cat /proc/meminfo | |
2405 // > increase amount of large pages: | |
2406 // echo new_value > /proc/sys/vm/nr_hugepages | |
2407 // Note 1: different Bsd may use different name for this property, | |
2408 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
2409 // Note 2: it's possible there's enough physical memory available but | |
2410 // they are so fragmented after a long run that they can't | |
2411 // coalesce into large pages. Try to reserve large pages when | |
2412 // the system is still "fresh". | |
2413 if (warn_on_failure) { | |
2414 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
2415 warning(msg); | |
2416 } | |
2417 return NULL; | |
2418 } | |
2419 | |
2420 // attach to the region | |
2421 addr = (char*)shmat(shmid, req_addr, 0); | |
2422 int err = errno; | |
2423 | |
2424 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
2425 // will be deleted when it's detached by shmdt() or when the process | |
2426 // terminates. If shmat() is not successful this will remove the shared | |
2427 // segment immediately. | |
2428 shmctl(shmid, IPC_RMID, NULL); | |
2429 | |
2430 if ((intptr_t)addr == -1) { | |
2431 if (warn_on_failure) { | |
2432 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
2433 warning(msg); | |
2434 } | |
2435 return NULL; | |
2436 } | |
2437 | |
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2438 // The memory is committed |
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2439 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
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2440 |
3960 | 2441 return addr; |
2442 } | |
2443 | |
2444 bool os::release_memory_special(char* base, size_t bytes) { | |
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2445 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
3960 | 2446 // detaching the SHM segment will also delete it, see reserve_memory_special() |
2447 int rslt = shmdt(base); | |
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2448 if (rslt == 0) { |
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2449 tkr.record((address)base, bytes); |
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2450 return true; |
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2451 } else { |
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2452 tkr.discard(); |
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2453 return false; |
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2454 } |
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2455 |
3960 | 2456 } |
2457 | |
2458 size_t os::large_page_size() { | |
2459 return _large_page_size; | |
2460 } | |
2461 | |
2462 // HugeTLBFS allows application to commit large page memory on demand; | |
2463 // with SysV SHM the entire memory region must be allocated as shared | |
2464 // memory. | |
2465 bool os::can_commit_large_page_memory() { | |
2466 return UseHugeTLBFS; | |
2467 } | |
2468 | |
2469 bool os::can_execute_large_page_memory() { | |
2470 return UseHugeTLBFS; | |
2471 } | |
2472 | |
2473 // Reserve memory at an arbitrary address, only if that area is | |
2474 // available (and not reserved for something else). | |
2475 | |
6197 | 2476 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
3960 | 2477 const int max_tries = 10; |
2478 char* base[max_tries]; | |
2479 size_t size[max_tries]; | |
2480 const size_t gap = 0x000000; | |
2481 | |
2482 // Assert only that the size is a multiple of the page size, since | |
2483 // that's all that mmap requires, and since that's all we really know | |
2484 // about at this low abstraction level. If we need higher alignment, | |
2485 // we can either pass an alignment to this method or verify alignment | |
2486 // in one of the methods further up the call chain. See bug 5044738. | |
2487 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
2488 | |
2489 // Repeatedly allocate blocks until the block is allocated at the | |
2490 // right spot. Give up after max_tries. Note that reserve_memory() will | |
2491 // automatically update _highest_vm_reserved_address if the call is | |
2492 // successful. The variable tracks the highest memory address every reserved | |
2493 // by JVM. It is used to detect heap-stack collision if running with | |
2494 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
2495 // space than needed, it could confuse the collision detecting code. To | |
2496 // solve the problem, save current _highest_vm_reserved_address and | |
2497 // calculate the correct value before return. | |
2498 address old_highest = _highest_vm_reserved_address; | |
2499 | |
2500 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
2501 // if kernel honors the hint then we can return immediately. | |
2502 char * addr = anon_mmap(requested_addr, bytes, false); | |
2503 if (addr == requested_addr) { | |
2504 return requested_addr; | |
2505 } | |
2506 | |
2507 if (addr != NULL) { | |
2508 // mmap() is successful but it fails to reserve at the requested address | |
2509 anon_munmap(addr, bytes); | |
2510 } | |
2511 | |
2512 int i; | |
2513 for (i = 0; i < max_tries; ++i) { | |
2514 base[i] = reserve_memory(bytes); | |
2515 | |
2516 if (base[i] != NULL) { | |
2517 // Is this the block we wanted? | |
2518 if (base[i] == requested_addr) { | |
2519 size[i] = bytes; | |
2520 break; | |
2521 } | |
2522 | |
2523 // Does this overlap the block we wanted? Give back the overlapped | |
2524 // parts and try again. | |
2525 | |
2526 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
2527 if (top_overlap >= 0 && top_overlap < bytes) { | |
2528 unmap_memory(base[i], top_overlap); | |
2529 base[i] += top_overlap; | |
2530 size[i] = bytes - top_overlap; | |
2531 } else { | |
2532 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
2533 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
2534 unmap_memory(requested_addr, bottom_overlap); | |
2535 size[i] = bytes - bottom_overlap; | |
2536 } else { | |
2537 size[i] = bytes; | |
2538 } | |
2539 } | |
2540 } | |
2541 } | |
2542 | |
2543 // Give back the unused reserved pieces. | |
2544 | |
2545 for (int j = 0; j < i; ++j) { | |
2546 if (base[j] != NULL) { | |
2547 unmap_memory(base[j], size[j]); | |
2548 } | |
2549 } | |
2550 | |
2551 if (i < max_tries) { | |
2552 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
2553 return requested_addr; | |
2554 } else { | |
2555 _highest_vm_reserved_address = old_highest; | |
2556 return NULL; | |
2557 } | |
2558 } | |
2559 | |
2560 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
2561 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
2562 } | |
2563 | |
2564 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
2565 // Solaris uses poll(), bsd uses park(). | |
2566 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
2567 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
2568 // SIGSEGV, see 4355769. | |
2569 | |
2570 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
2571 assert(thread == Thread::current(), "thread consistency check"); | |
2572 | |
2573 ParkEvent * const slp = thread->_SleepEvent ; | |
2574 slp->reset() ; | |
2575 OrderAccess::fence() ; | |
2576 | |
2577 if (interruptible) { | |
2578 jlong prevtime = javaTimeNanos(); | |
2579 | |
2580 for (;;) { | |
2581 if (os::is_interrupted(thread, true)) { | |
2582 return OS_INTRPT; | |
2583 } | |
2584 | |
2585 jlong newtime = javaTimeNanos(); | |
2586 | |
2587 if (newtime - prevtime < 0) { | |
2588 // time moving backwards, should only happen if no monotonic clock | |
2589 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2590 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2591 } else { | |
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2592 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2593 } |
2594 | |
2595 if(millis <= 0) { | |
2596 return OS_OK; | |
2597 } | |
2598 | |
2599 prevtime = newtime; | |
2600 | |
2601 { | |
2602 assert(thread->is_Java_thread(), "sanity check"); | |
2603 JavaThread *jt = (JavaThread *) thread; | |
2604 ThreadBlockInVM tbivm(jt); | |
2605 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
2606 | |
2607 jt->set_suspend_equivalent(); | |
2608 // cleared by handle_special_suspend_equivalent_condition() or | |
2609 // java_suspend_self() via check_and_wait_while_suspended() | |
2610 | |
2611 slp->park(millis); | |
2612 | |
2613 // were we externally suspended while we were waiting? | |
2614 jt->check_and_wait_while_suspended(); | |
2615 } | |
2616 } | |
2617 } else { | |
2618 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
2619 jlong prevtime = javaTimeNanos(); | |
2620 | |
2621 for (;;) { | |
2622 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
2623 // the 1st iteration ... | |
2624 jlong newtime = javaTimeNanos(); | |
2625 | |
2626 if (newtime - prevtime < 0) { | |
2627 // time moving backwards, should only happen if no monotonic clock | |
2628 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2629 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2630 } else { | |
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2631 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2632 } |
2633 | |
2634 if(millis <= 0) break ; | |
2635 | |
2636 prevtime = newtime; | |
2637 slp->park(millis); | |
2638 } | |
2639 return OS_OK ; | |
2640 } | |
2641 } | |
2642 | |
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2643 void os::naked_short_sleep(jlong ms) { |
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2644 struct timespec req; |
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2645 |
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2646 assert(ms < 1000, "Un-interruptable sleep, short time use only"); |
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2647 req.tv_sec = 0; |
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2648 if (ms > 0) { |
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2649 req.tv_nsec = (ms % 1000) * 1000000; |
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2650 } |
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2651 else { |
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2652 req.tv_nsec = 1; |
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2653 } |
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2654 |
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2655 nanosleep(&req, NULL); |
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2656 |
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2657 return; |
3960 | 2658 } |
2659 | |
2660 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
2661 void os::infinite_sleep() { | |
2662 while (true) { // sleep forever ... | |
2663 ::sleep(100); // ... 100 seconds at a time | |
2664 } | |
2665 } | |
2666 | |
2667 // Used to convert frequent JVM_Yield() to nops | |
2668 bool os::dont_yield() { | |
2669 return DontYieldALot; | |
2670 } | |
2671 | |
2672 void os::yield() { | |
2673 sched_yield(); | |
2674 } | |
2675 | |
2676 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
2677 | |
2678 void os::yield_all(int attempts) { | |
2679 // Yields to all threads, including threads with lower priorities | |
2680 // Threads on Bsd are all with same priority. The Solaris style | |
2681 // os::yield_all() with nanosleep(1ms) is not necessary. | |
2682 sched_yield(); | |
2683 } | |
2684 | |
2685 // Called from the tight loops to possibly influence time-sharing heuristics | |
2686 void os::loop_breaker(int attempts) { | |
2687 os::yield_all(attempts); | |
2688 } | |
2689 | |
2690 //////////////////////////////////////////////////////////////////////////////// | |
2691 // thread priority support | |
2692 | |
2693 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
2694 // only supports dynamic priority, static priority must be zero. For real-time | |
2695 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
2696 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
2697 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
2698 // of 5 runs - Sep 2005). | |
2699 // | |
2700 // The following code actually changes the niceness of kernel-thread/LWP. It | |
2701 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
2702 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
2703 // threads. It has always been the case, but could change in the future. For | |
2704 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
2705 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
2706 | |
6918 | 2707 #if !defined(__APPLE__) |
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2708 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2709 19, // 0 Entry should never be used |
2710 | |
2711 0, // 1 MinPriority | |
2712 3, // 2 | |
2713 6, // 3 | |
2714 | |
4854
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2715 10, // 4 |
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2716 15, // 5 NormPriority |
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2717 18, // 6 |
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2718 |
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2719 21, // 7 |
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2720 25, // 8 |
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2721 28, // 9 NearMaxPriority |
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2722 |
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2723 31, // 10 MaxPriority |
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2724 |
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2725 31 // 11 CriticalPriority |
3960 | 2726 }; |
6918 | 2727 #else |
3960 | 2728 /* Using Mach high-level priority assignments */ |
4854
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2729 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2730 0, // 0 Entry should never be used (MINPRI_USER) |
2731 | |
2732 27, // 1 MinPriority | |
2733 28, // 2 | |
2734 29, // 3 | |
2735 | |
2736 30, // 4 | |
2737 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
2738 32, // 6 | |
2739 | |
2740 33, // 7 | |
2741 34, // 8 | |
2742 35, // 9 NearMaxPriority | |
2743 | |
4854
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2744 36, // 10 MaxPriority |
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2745 |
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2746 36 // 11 CriticalPriority |
3960 | 2747 }; |
2748 #endif | |
2749 | |
2750 static int prio_init() { | |
2751 if (ThreadPriorityPolicy == 1) { | |
2752 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
2753 // if effective uid is not root. Perhaps, a more elegant way of doing | |
2754 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
2755 if (geteuid() != 0) { | |
2756 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
2757 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
2758 } | |
2759 ThreadPriorityPolicy = 0; | |
2760 } | |
2761 } | |
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2762 if (UseCriticalJavaThreadPriority) { |
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2763 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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2764 } |
3960 | 2765 return 0; |
2766 } | |
2767 | |
2768 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
2769 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
2770 | |
2771 #ifdef __OpenBSD__ | |
2772 // OpenBSD pthread_setprio starves low priority threads | |
2773 return OS_OK; | |
2774 #elif defined(__FreeBSD__) | |
2775 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
2776 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2777 struct sched_param sp; | |
2778 int policy; | |
2779 pthread_t self = pthread_self(); | |
2780 | |
2781 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
2782 return OS_ERR; | |
2783 | |
2784 sp.sched_priority = newpri; | |
2785 if (pthread_setschedparam(self, policy, &sp) != 0) | |
2786 return OS_ERR; | |
2787 | |
2788 return OS_OK; | |
2789 #else | |
2790 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
2791 return (ret == 0) ? OS_OK : OS_ERR; | |
2792 #endif | |
2793 } | |
2794 | |
2795 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
2796 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
2797 *priority_ptr = java_to_os_priority[NormPriority]; | |
2798 return OS_OK; | |
2799 } | |
2800 | |
2801 errno = 0; | |
2802 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
2803 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
2804 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2805 int policy; | |
2806 struct sched_param sp; | |
2807 | |
2808 pthread_getschedparam(pthread_self(), &policy, &sp); | |
2809 *priority_ptr = sp.sched_priority; | |
2810 #else | |
2811 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
2812 #endif | |
2813 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
2814 } | |
2815 | |
2816 // Hint to the underlying OS that a task switch would not be good. | |
2817 // Void return because it's a hint and can fail. | |
2818 void os::hint_no_preempt() {} | |
2819 | |
2820 //////////////////////////////////////////////////////////////////////////////// | |
2821 // suspend/resume support | |
2822 | |
2823 // the low-level signal-based suspend/resume support is a remnant from the | |
2824 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
2825 // within hotspot. Now there is a single use-case for this: | |
2826 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
2827 // that runs in the watcher thread. | |
2828 // The remaining code is greatly simplified from the more general suspension | |
2829 // code that used to be used. | |
2830 // | |
2831 // The protocol is quite simple: | |
2832 // - suspend: | |
2833 // - sends a signal to the target thread | |
2834 // - polls the suspend state of the osthread using a yield loop | |
2835 // - target thread signal handler (SR_handler) sets suspend state | |
2836 // and blocks in sigsuspend until continued | |
2837 // - resume: | |
2838 // - sets target osthread state to continue | |
2839 // - sends signal to end the sigsuspend loop in the SR_handler | |
2840 // | |
2841 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
2842 // | |
2843 | |
2844 static void resume_clear_context(OSThread *osthread) { | |
2845 osthread->set_ucontext(NULL); | |
2846 osthread->set_siginfo(NULL); | |
2847 } | |
2848 | |
2849 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
2850 osthread->set_ucontext(context); | |
2851 osthread->set_siginfo(siginfo); | |
2852 } | |
2853 | |
2854 // | |
2855 // Handler function invoked when a thread's execution is suspended or | |
2856 // resumed. We have to be careful that only async-safe functions are | |
2857 // called here (Note: most pthread functions are not async safe and | |
2858 // should be avoided.) | |
2859 // | |
2860 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
2861 // interface point of view, but sigwait() prevents the signal hander | |
2862 // from being run. libpthread would get very confused by not having | |
2863 // its signal handlers run and prevents sigwait()'s use with the | |
2864 // mutex granting granting signal. | |
2865 // | |
10405 | 2866 // Currently only ever called on the VMThread or JavaThread |
3960 | 2867 // |
2868 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
2869 // Save and restore errno to avoid confusing native code with EINTR | |
2870 // after sigsuspend. | |
2871 int old_errno = errno; | |
2872 | |
2873 Thread* thread = Thread::current(); | |
2874 OSThread* osthread = thread->osthread(); | |
10405 | 2875 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
2876 | |
2877 os::SuspendResume::State current = osthread->sr.state(); | |
2878 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
3960 | 2879 suspend_save_context(osthread, siginfo, context); |
2880 | |
10405 | 2881 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
2882 os::SuspendResume::State state = osthread->sr.suspended(); | |
2883 if (state == os::SuspendResume::SR_SUSPENDED) { | |
2884 sigset_t suspend_set; // signals for sigsuspend() | |
2885 | |
2886 // get current set of blocked signals and unblock resume signal | |
2887 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
2888 sigdelset(&suspend_set, SR_signum); | |
2889 | |
2890 sr_semaphore.signal(); | |
2891 // wait here until we are resumed | |
2892 while (1) { | |
2893 sigsuspend(&suspend_set); | |
2894 | |
2895 os::SuspendResume::State result = osthread->sr.running(); | |
2896 if (result == os::SuspendResume::SR_RUNNING) { | |
2897 sr_semaphore.signal(); | |
2898 break; | |
2899 } else if (result != os::SuspendResume::SR_SUSPENDED) { | |
2900 ShouldNotReachHere(); | |
2901 } | |
2902 } | |
2903 | |
2904 } else if (state == os::SuspendResume::SR_RUNNING) { | |
2905 // request was cancelled, continue | |
2906 } else { | |
2907 ShouldNotReachHere(); | |
2908 } | |
3960 | 2909 |
2910 resume_clear_context(osthread); | |
10405 | 2911 } else if (current == os::SuspendResume::SR_RUNNING) { |
2912 // request was cancelled, continue | |
2913 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
2914 // ignore | |
3960 | 2915 } else { |
10405 | 2916 // ignore |
3960 | 2917 } |
2918 | |
2919 errno = old_errno; | |
2920 } | |
2921 | |
2922 | |
2923 static int SR_initialize() { | |
2924 struct sigaction act; | |
2925 char *s; | |
2926 /* Get signal number to use for suspend/resume */ | |
2927 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
2928 int sig = ::strtol(s, 0, 10); | |
2929 if (sig > 0 || sig < NSIG) { | |
2930 SR_signum = sig; | |
2931 } | |
2932 } | |
2933 | |
2934 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
2935 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
2936 | |
2937 sigemptyset(&SR_sigset); | |
2938 sigaddset(&SR_sigset, SR_signum); | |
2939 | |
2940 /* Set up signal handler for suspend/resume */ | |
2941 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
2942 act.sa_handler = (void (*)(int)) SR_handler; | |
2943 | |
2944 // SR_signum is blocked by default. | |
2945 // 4528190 - We also need to block pthread restart signal (32 on all | |
2946 // supported Bsd platforms). Note that BsdThreads need to block | |
2947 // this signal for all threads to work properly. So we don't have | |
2948 // to use hard-coded signal number when setting up the mask. | |
2949 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
2950 | |
2951 if (sigaction(SR_signum, &act, 0) == -1) { | |
2952 return -1; | |
2953 } | |
2954 | |
2955 // Save signal flag | |
2956 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
2957 return 0; | |
2958 } | |
2959 | |
10405 | 2960 static int sr_notify(OSThread* osthread) { |
2961 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2962 assert_status(status == 0, status, "pthread_kill"); | |
2963 return status; | |
2964 } | |
2965 | |
2966 // "Randomly" selected value for how long we want to spin | |
2967 // before bailing out on suspending a thread, also how often | |
2968 // we send a signal to a thread we want to resume | |
2969 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
2970 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
3960 | 2971 |
2972 // returns true on success and false on error - really an error is fatal | |
2973 // but this seems the normal response to library errors | |
2974 static bool do_suspend(OSThread* osthread) { | |
10405 | 2975 assert(osthread->sr.is_running(), "thread should be running"); |
2976 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
2977 | |
3960 | 2978 // mark as suspended and send signal |
10405 | 2979 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
2980 // failed to switch, state wasn't running? | |
2981 ShouldNotReachHere(); | |
3960 | 2982 return false; |
2983 } | |
10405 | 2984 |
2985 if (sr_notify(osthread) != 0) { | |
2986 ShouldNotReachHere(); | |
2987 } | |
2988 | |
2989 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
2990 while (true) { | |
2991 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
2992 break; | |
2993 } else { | |
2994 // timeout | |
2995 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
2996 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
2997 return false; | |
2998 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
2999 // make sure that we consume the signal on the semaphore as well | |
3000 sr_semaphore.wait(); | |
3001 break; | |
3002 } else { | |
3003 ShouldNotReachHere(); | |
3004 return false; | |
3005 } | |
3006 } | |
3007 } | |
3008 | |
3009 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
3010 return true; | |
3960 | 3011 } |
3012 | |
3013 static void do_resume(OSThread* osthread) { | |
3014 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 3015 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
3016 | |
3017 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
3018 // failed to switch to WAKEUP_REQUEST | |
3019 ShouldNotReachHere(); | |
3020 return; | |
3021 } | |
3022 | |
3023 while (true) { | |
3024 if (sr_notify(osthread) == 0) { | |
3025 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
3026 if (osthread->sr.is_running()) { | |
3027 return; | |
3028 } | |
3029 } | |
3030 } else { | |
3031 ShouldNotReachHere(); | |
3960 | 3032 } |
3033 } | |
10405 | 3034 |
3035 guarantee(osthread->sr.is_running(), "Must be running!"); | |
3960 | 3036 } |
3037 | |
3038 //////////////////////////////////////////////////////////////////////////////// | |
3039 // interrupt support | |
3040 | |
3041 void os::interrupt(Thread* thread) { | |
3042 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3043 "possibility of dangling Thread pointer"); | |
3044 | |
3045 OSThread* osthread = thread->osthread(); | |
3046 | |
3047 if (!osthread->interrupted()) { | |
3048 osthread->set_interrupted(true); | |
3049 // More than one thread can get here with the same value of osthread, | |
3050 // resulting in multiple notifications. We do, however, want the store | |
3051 // to interrupted() to be visible to other threads before we execute unpark(). | |
3052 OrderAccess::fence(); | |
3053 ParkEvent * const slp = thread->_SleepEvent ; | |
3054 if (slp != NULL) slp->unpark() ; | |
3055 } | |
3056 | |
3057 // For JSR166. Unpark even if interrupt status already was set | |
3058 if (thread->is_Java_thread()) | |
3059 ((JavaThread*)thread)->parker()->unpark(); | |
3060 | |
3061 ParkEvent * ev = thread->_ParkEvent ; | |
3062 if (ev != NULL) ev->unpark() ; | |
3063 | |
3064 } | |
3065 | |
3066 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
3067 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3068 "possibility of dangling Thread pointer"); | |
3069 | |
3070 OSThread* osthread = thread->osthread(); | |
3071 | |
3072 bool interrupted = osthread->interrupted(); | |
3073 | |
3074 if (interrupted && clear_interrupted) { | |
3075 osthread->set_interrupted(false); | |
3076 // consider thread->_SleepEvent->reset() ... optional optimization | |
3077 } | |
3078 | |
3079 return interrupted; | |
3080 } | |
3081 | |
3082 /////////////////////////////////////////////////////////////////////////////////// | |
3083 // signal handling (except suspend/resume) | |
3084 | |
3085 // This routine may be used by user applications as a "hook" to catch signals. | |
3086 // The user-defined signal handler must pass unrecognized signals to this | |
3087 // routine, and if it returns true (non-zero), then the signal handler must | |
3088 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
3089 // routine will never retun false (zero), but instead will execute a VM panic | |
3090 // routine kill the process. | |
3091 // | |
3092 // If this routine returns false, it is OK to call it again. This allows | |
3093 // the user-defined signal handler to perform checks either before or after | |
3094 // the VM performs its own checks. Naturally, the user code would be making | |
3095 // a serious error if it tried to handle an exception (such as a null check | |
3096 // or breakpoint) that the VM was generating for its own correct operation. | |
3097 // | |
3098 // This routine may recognize any of the following kinds of signals: | |
3099 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3100 // It should be consulted by handlers for any of those signals. | |
3101 // | |
3102 // The caller of this routine must pass in the three arguments supplied | |
3103 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3104 // field of the structure passed to sigaction(). This routine assumes that | |
3105 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3106 // | |
3107 // Note that the VM will print warnings if it detects conflicting signal | |
3108 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3109 // | |
3110 extern "C" JNIEXPORT int | |
3111 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
3112 void* ucontext, int abort_if_unrecognized); | |
3113 | |
3114 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
3115 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 3116 int orig_errno = errno; // Preserve errno value over signal handler. |
3960 | 3117 JVM_handle_bsd_signal(sig, info, uc, true); |
8067 | 3118 errno = orig_errno; |
3960 | 3119 } |
3120 | |
3121 | |
3122 // This boolean allows users to forward their own non-matching signals | |
3123 // to JVM_handle_bsd_signal, harmlessly. | |
3124 bool os::Bsd::signal_handlers_are_installed = false; | |
3125 | |
3126 // For signal-chaining | |
3127 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
3128 unsigned int os::Bsd::sigs = 0; | |
3129 bool os::Bsd::libjsig_is_loaded = false; | |
3130 typedef struct sigaction *(*get_signal_t)(int); | |
3131 get_signal_t os::Bsd::get_signal_action = NULL; | |
3132 | |
3133 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
3134 struct sigaction *actp = NULL; | |
3135 | |
3136 if (libjsig_is_loaded) { | |
3137 // Retrieve the old signal handler from libjsig | |
3138 actp = (*get_signal_action)(sig); | |
3139 } | |
3140 if (actp == NULL) { | |
3141 // Retrieve the preinstalled signal handler from jvm | |
3142 actp = get_preinstalled_handler(sig); | |
3143 } | |
3144 | |
3145 return actp; | |
3146 } | |
3147 | |
3148 static bool call_chained_handler(struct sigaction *actp, int sig, | |
3149 siginfo_t *siginfo, void *context) { | |
3150 // Call the old signal handler | |
3151 if (actp->sa_handler == SIG_DFL) { | |
3152 // It's more reasonable to let jvm treat it as an unexpected exception | |
3153 // instead of taking the default action. | |
3154 return false; | |
3155 } else if (actp->sa_handler != SIG_IGN) { | |
3156 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
3157 // automaticlly block the signal | |
3158 sigaddset(&(actp->sa_mask), sig); | |
3159 } | |
3160 | |
3161 sa_handler_t hand; | |
3162 sa_sigaction_t sa; | |
3163 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
3164 // retrieve the chained handler | |
3165 if (siginfo_flag_set) { | |
3166 sa = actp->sa_sigaction; | |
3167 } else { | |
3168 hand = actp->sa_handler; | |
3169 } | |
3170 | |
3171 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
3172 actp->sa_handler = SIG_DFL; | |
3173 } | |
3174 | |
3175 // try to honor the signal mask | |
3176 sigset_t oset; | |
3177 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
3178 | |
3179 // call into the chained handler | |
3180 if (siginfo_flag_set) { | |
3181 (*sa)(sig, siginfo, context); | |
3182 } else { | |
3183 (*hand)(sig); | |
3184 } | |
3185 | |
3186 // restore the signal mask | |
3187 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
3188 } | |
3189 // Tell jvm's signal handler the signal is taken care of. | |
3190 return true; | |
3191 } | |
3192 | |
3193 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
3194 bool chained = false; | |
3195 // signal-chaining | |
3196 if (UseSignalChaining) { | |
3197 struct sigaction *actp = get_chained_signal_action(sig); | |
3198 if (actp != NULL) { | |
3199 chained = call_chained_handler(actp, sig, siginfo, context); | |
3200 } | |
3201 } | |
3202 return chained; | |
3203 } | |
3204 | |
3205 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
3206 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
3207 return &sigact[sig]; | |
3208 } | |
3209 return NULL; | |
3210 } | |
3211 | |
3212 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
3213 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3214 sigact[sig] = oldAct; | |
3215 sigs |= (unsigned int)1 << sig; | |
3216 } | |
3217 | |
3218 // for diagnostic | |
3219 int os::Bsd::sigflags[MAXSIGNUM]; | |
3220 | |
3221 int os::Bsd::get_our_sigflags(int sig) { | |
3222 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3223 return sigflags[sig]; | |
3224 } | |
3225 | |
3226 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
3227 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3228 sigflags[sig] = flags; | |
3229 } | |
3230 | |
3231 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
3232 // Check for overwrite. | |
3233 struct sigaction oldAct; | |
3234 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
3235 | |
3236 void* oldhand = oldAct.sa_sigaction | |
3237 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3238 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3239 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
3240 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
3241 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
3242 if (AllowUserSignalHandlers || !set_installed) { | |
3243 // Do not overwrite; user takes responsibility to forward to us. | |
3244 return; | |
3245 } else if (UseSignalChaining) { | |
3246 // save the old handler in jvm | |
3247 save_preinstalled_handler(sig, oldAct); | |
3248 // libjsig also interposes the sigaction() call below and saves the | |
3249 // old sigaction on it own. | |
3250 } else { | |
3251 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
3252 "%#lx for signal %d.", (long)oldhand, sig)); | |
3253 } | |
3254 } | |
3255 | |
3256 struct sigaction sigAct; | |
3257 sigfillset(&(sigAct.sa_mask)); | |
3258 sigAct.sa_handler = SIG_DFL; | |
3259 if (!set_installed) { | |
3260 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3261 } else { | |
3262 sigAct.sa_sigaction = signalHandler; | |
3263 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3264 } | |
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3265 #ifdef __APPLE__ |
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3266 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV |
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3267 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" |
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3268 // if the signal handler declares it will handle it on alternate stack. |
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3269 // Notice we only declare we will handle it on alt stack, but we are not |
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3270 // actually going to use real alt stack - this is just a workaround. |
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3271 // Please see ux_exception.c, method catch_mach_exception_raise for details |
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3272 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c |
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3273 if (sig == SIGSEGV) { |
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3274 sigAct.sa_flags |= SA_ONSTACK; |
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3275 } |
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3276 #endif |
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3277 |
3960 | 3278 // Save flags, which are set by ours |
3279 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3280 sigflags[sig] = sigAct.sa_flags; | |
3281 | |
3282 int ret = sigaction(sig, &sigAct, &oldAct); | |
3283 assert(ret == 0, "check"); | |
3284 | |
3285 void* oldhand2 = oldAct.sa_sigaction | |
3286 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3287 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3288 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3289 } | |
3290 | |
3291 // install signal handlers for signals that HotSpot needs to | |
3292 // handle in order to support Java-level exception handling. | |
3293 | |
3294 void os::Bsd::install_signal_handlers() { | |
3295 if (!signal_handlers_are_installed) { | |
3296 signal_handlers_are_installed = true; | |
3297 | |
3298 // signal-chaining | |
3299 typedef void (*signal_setting_t)(); | |
3300 signal_setting_t begin_signal_setting = NULL; | |
3301 signal_setting_t end_signal_setting = NULL; | |
3302 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3303 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3304 if (begin_signal_setting != NULL) { | |
3305 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3306 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3307 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3308 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3309 libjsig_is_loaded = true; | |
3310 assert(UseSignalChaining, "should enable signal-chaining"); | |
3311 } | |
3312 if (libjsig_is_loaded) { | |
3313 // Tell libjsig jvm is setting signal handlers | |
3314 (*begin_signal_setting)(); | |
3315 } | |
3316 | |
3317 set_signal_handler(SIGSEGV, true); | |
3318 set_signal_handler(SIGPIPE, true); | |
3319 set_signal_handler(SIGBUS, true); | |
3320 set_signal_handler(SIGILL, true); | |
3321 set_signal_handler(SIGFPE, true); | |
3322 set_signal_handler(SIGXFSZ, true); | |
3323 | |
3324 #if defined(__APPLE__) | |
3325 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
3326 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
3327 // signal handler that's placed on our process by CrashReporter. This disables | |
3328 // CrashReporter-based reporting. | |
3329 // | |
3330 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
3331 // on caught fatal signals. | |
3332 // | |
3333 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
3334 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
3335 // exception handling, while leaving the standard BSD signal handlers functional. | |
3336 kern_return_t kr; | |
3337 kr = task_set_exception_ports(mach_task_self(), | |
3338 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
3339 MACH_PORT_NULL, | |
3340 EXCEPTION_STATE_IDENTITY, | |
3341 MACHINE_THREAD_STATE); | |
3342 | |
3343 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
3344 #endif | |
3345 | |
3346 if (libjsig_is_loaded) { | |
3347 // Tell libjsig jvm finishes setting signal handlers | |
3348 (*end_signal_setting)(); | |
3349 } | |
3350 | |
3351 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3352 // and if UserSignalHandler is installed all bets are off | |
3353 if (CheckJNICalls) { | |
3354 if (libjsig_is_loaded) { | |
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3355 if (PrintJNIResolving) { |
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3356 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
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3357 } |
3960 | 3358 check_signals = false; |
3359 } | |
3360 if (AllowUserSignalHandlers) { | |
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3361 if (PrintJNIResolving) { |
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3362 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
3a57fa7a4cd0
7121403: [TESTBUG] runtime/7051189/Xchecksig.sh fails on 64bit solaris
hseigel
parents:
12095
diff
changeset
|
3363 } |
3960 | 3364 check_signals = false; |
3365 } | |
3366 } | |
3367 } | |
3368 } | |
3369 | |
3370 | |
3371 ///// | |
3372 // glibc on Bsd platform uses non-documented flag | |
3373 // to indicate, that some special sort of signal | |
3374 // trampoline is used. | |
3375 // We will never set this flag, and we should | |
3376 // ignore this flag in our diagnostic | |
3377 #ifdef SIGNIFICANT_SIGNAL_MASK | |
3378 #undef SIGNIFICANT_SIGNAL_MASK | |
3379 #endif | |
3380 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
3381 | |
3382 static const char* get_signal_handler_name(address handler, | |
3383 char* buf, int buflen) { | |
3384 int offset; | |
3385 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3386 if (found) { | |
3387 // skip directory names | |
3388 const char *p1, *p2; | |
3389 p1 = buf; | |
3390 size_t len = strlen(os::file_separator()); | |
3391 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3392 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
3393 } else { | |
3394 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3395 } | |
3396 return buf; | |
3397 } | |
3398 | |
3399 static void print_signal_handler(outputStream* st, int sig, | |
3400 char* buf, size_t buflen) { | |
3401 struct sigaction sa; | |
3402 | |
3403 sigaction(sig, NULL, &sa); | |
3404 | |
3405 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
3406 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3407 | |
3408 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3409 | |
3410 address handler = (sa.sa_flags & SA_SIGINFO) | |
3411 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3412 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3413 | |
3414 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3415 st->print("SIG_DFL"); | |
3416 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3417 st->print("SIG_IGN"); | |
3418 } else { | |
3419 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3420 } | |
3421 | |
14410 | 3422 st->print(", sa_mask[0]="); |
3423 os::Posix::print_signal_set_short(st, &sa.sa_mask); | |
3960 | 3424 |
3425 address rh = VMError::get_resetted_sighandler(sig); | |
3426 // May be, handler was resetted by VMError? | |
3427 if(rh != NULL) { | |
3428 handler = rh; | |
3429 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
3430 } | |
3431 | |
14410 | 3432 st->print(", sa_flags="); |
3433 os::Posix::print_sa_flags(st, sa.sa_flags); | |
3960 | 3434 |
3435 // Check: is it our handler? | |
3436 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
3437 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3438 // It is our signal handler | |
3439 // check for flags, reset system-used one! | |
3440 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3441 st->print( | |
3442 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3443 os::Bsd::get_our_sigflags(sig)); | |
3444 } | |
3445 } | |
3446 st->cr(); | |
3447 } | |
3448 | |
3449 | |
3450 #define DO_SIGNAL_CHECK(sig) \ | |
3451 if (!sigismember(&check_signal_done, sig)) \ | |
3452 os::Bsd::check_signal_handler(sig) | |
3453 | |
3454 // This method is a periodic task to check for misbehaving JNI applications | |
3455 // under CheckJNI, we can add any periodic checks here | |
3456 | |
3457 void os::run_periodic_checks() { | |
3458 | |
3459 if (check_signals == false) return; | |
3460 | |
3461 // SEGV and BUS if overridden could potentially prevent | |
3462 // generation of hs*.log in the event of a crash, debugging | |
3463 // such a case can be very challenging, so we absolutely | |
3464 // check the following for a good measure: | |
3465 DO_SIGNAL_CHECK(SIGSEGV); | |
3466 DO_SIGNAL_CHECK(SIGILL); | |
3467 DO_SIGNAL_CHECK(SIGFPE); | |
3468 DO_SIGNAL_CHECK(SIGBUS); | |
3469 DO_SIGNAL_CHECK(SIGPIPE); | |
3470 DO_SIGNAL_CHECK(SIGXFSZ); | |
3471 | |
3472 | |
3473 // ReduceSignalUsage allows the user to override these handlers | |
3474 // see comments at the very top and jvm_solaris.h | |
3475 if (!ReduceSignalUsage) { | |
3476 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3477 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3478 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3479 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3480 } | |
3481 | |
3482 DO_SIGNAL_CHECK(SR_signum); | |
3483 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3484 } | |
3485 | |
3486 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3487 | |
3488 static os_sigaction_t os_sigaction = NULL; | |
3489 | |
3490 void os::Bsd::check_signal_handler(int sig) { | |
3491 char buf[O_BUFLEN]; | |
3492 address jvmHandler = NULL; | |
3493 | |
3494 | |
3495 struct sigaction act; | |
3496 if (os_sigaction == NULL) { | |
3497 // only trust the default sigaction, in case it has been interposed | |
3498 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3499 if (os_sigaction == NULL) return; | |
3500 } | |
3501 | |
3502 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3503 | |
3504 | |
3505 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3506 | |
3507 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3508 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3509 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
3510 | |
3511 | |
3512 switch(sig) { | |
3513 case SIGSEGV: | |
3514 case SIGBUS: | |
3515 case SIGFPE: | |
3516 case SIGPIPE: | |
3517 case SIGILL: | |
3518 case SIGXFSZ: | |
3519 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
3520 break; | |
3521 | |
3522 case SHUTDOWN1_SIGNAL: | |
3523 case SHUTDOWN2_SIGNAL: | |
3524 case SHUTDOWN3_SIGNAL: | |
3525 case BREAK_SIGNAL: | |
3526 jvmHandler = (address)user_handler(); | |
3527 break; | |
3528 | |
3529 case INTERRUPT_SIGNAL: | |
3530 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3531 break; | |
3532 | |
3533 default: | |
3534 if (sig == SR_signum) { | |
3535 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3536 } else { | |
3537 return; | |
3538 } | |
3539 break; | |
3540 } | |
3541 | |
3542 if (thisHandler != jvmHandler) { | |
3543 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3544 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3545 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3546 // No need to check this sig any longer | |
3547 sigaddset(&check_signal_done, sig); | |
3548 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3549 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3550 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
3551 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3552 // No need to check this sig any longer | |
3553 sigaddset(&check_signal_done, sig); | |
3554 } | |
3555 | |
3556 // Dump all the signal | |
3557 if (sigismember(&check_signal_done, sig)) { | |
3558 print_signal_handlers(tty, buf, O_BUFLEN); | |
3559 } | |
3560 } | |
3561 | |
3562 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
3563 | |
3564 extern bool signal_name(int signo, char* buf, size_t len); | |
3565 | |
3566 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3567 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3568 // signal | |
3569 if (!signal_name(exception_code, buf, size)) { | |
3570 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3571 } | |
3572 return buf; | |
3573 } else { | |
3574 return NULL; | |
3575 } | |
3576 } | |
3577 | |
3578 // this is called _before_ the most of global arguments have been parsed | |
3579 void os::init(void) { | |
3580 char dummy; /* used to get a guess on initial stack address */ | |
3581 // first_hrtime = gethrtime(); | |
3582 | |
3583 // With BsdThreads the JavaMain thread pid (primordial thread) | |
3584 // is different than the pid of the java launcher thread. | |
3585 // So, on Bsd, the launcher thread pid is passed to the VM | |
3586 // via the sun.java.launcher.pid property. | |
3587 // Use this property instead of getpid() if it was correctly passed. | |
3588 // See bug 6351349. | |
3589 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
3590 | |
3591 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
3592 | |
3593 clock_tics_per_sec = CLK_TCK; | |
3594 | |
3595 init_random(1234567); | |
3596 | |
3597 ThreadCritical::initialize(); | |
3598 | |
3599 Bsd::set_page_size(getpagesize()); | |
3600 if (Bsd::page_size() == -1) { | |
3601 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
3602 strerror(errno))); | |
3603 } | |
3604 init_page_sizes((size_t) Bsd::page_size()); | |
3605 | |
3606 Bsd::initialize_system_info(); | |
3607 | |
3608 // main_thread points to the aboriginal thread | |
3609 Bsd::_main_thread = pthread_self(); | |
3610 | |
3611 Bsd::clock_init(); | |
12997
e4f478e7781b
8027294: Prepare hotspot for non TOD based uptime counter
jbachorik
parents:
12856
diff
changeset
|
3612 initial_time_count = javaTimeNanos(); |
3960 | 3613 |
3614 #ifdef __APPLE__ | |
3615 // XXXDARWIN | |
3616 // Work around the unaligned VM callbacks in hotspot's | |
3617 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
3618 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
3619 // alignment when doing symbol lookup. To work around this, we force early | |
3620 // binding of all symbols now, thus binding when alignment is known-good. | |
3621 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
3622 #endif | |
3623 } | |
3624 | |
3625 // To install functions for atexit system call | |
3626 extern "C" { | |
3627 static void perfMemory_exit_helper() { | |
3628 perfMemory_exit(); | |
3629 } | |
3630 } | |
3631 | |
3632 // this is called _after_ the global arguments have been parsed | |
3633 jint os::init_2(void) | |
3634 { | |
3635 // Allocate a single page and mark it as readable for safepoint polling | |
3636 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3637 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
3638 | |
3639 os::set_polling_page( polling_page ); | |
3640 | |
3641 #ifndef PRODUCT | |
3642 if(Verbose && PrintMiscellaneous) | |
3643 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
3644 #endif | |
3645 | |
3646 if (!UseMembar) { | |
3647 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
10969
a837fa3d3f86
8013057: assert(_needs_gc || SafepointSynchronize::is_at_safepoint()) failed: only read at safepoint
dcubed
parents:
10405
diff
changeset
|
3648 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
3960 | 3649 os::set_memory_serialize_page( mem_serialize_page ); |
3650 | |
3651 #ifndef PRODUCT | |
3652 if(Verbose && PrintMiscellaneous) | |
3653 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
3654 #endif | |
3655 } | |
3656 | |
3657 // initialize suspend/resume support - must do this before signal_sets_init() | |
3658 if (SR_initialize() != 0) { | |
3659 perror("SR_initialize failed"); | |
3660 return JNI_ERR; | |
3661 } | |
3662 | |
3663 Bsd::signal_sets_init(); | |
3664 Bsd::install_signal_handlers(); | |
3665 | |
3666 // Check minimum allowable stack size for thread creation and to initialize | |
3667 // the java system classes, including StackOverflowError - depends on page | |
3668 // size. Add a page for compiler2 recursion in main thread. | |
3669 // Add in 2*BytesPerWord times page size to account for VM stack during | |
3670 // class initialization depending on 32 or 64 bit VM. | |
3671 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
3672 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
3673 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
3674 | |
3675 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
3676 if (threadStackSizeInBytes != 0 && | |
3677 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
3678 tty->print_cr("\nThe stack size specified is too small, " | |
3679 "Specify at least %dk", | |
3680 os::Bsd::min_stack_allowed/ K); | |
3681 return JNI_ERR; | |
3682 } | |
3683 | |
3684 // Make the stack size a multiple of the page size so that | |
3685 // the yellow/red zones can be guarded. | |
3686 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
3687 vm_page_size())); | |
3688 | |
3689 if (MaxFDLimit) { | |
3690 // set the number of file descriptors to max. print out error | |
3691 // if getrlimit/setrlimit fails but continue regardless. | |
3692 struct rlimit nbr_files; | |
3693 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
3694 if (status != 0) { | |
3695 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3696 perror("os::init_2 getrlimit failed"); | |
3697 } else { | |
3698 nbr_files.rlim_cur = nbr_files.rlim_max; | |
3699 | |
3700 #ifdef __APPLE__ | |
3701 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
3702 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
3703 // be used instead | |
3704 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
3705 #endif | |
3706 | |
3707 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
3708 if (status != 0) { | |
3709 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3710 perror("os::init_2 setrlimit failed"); | |
3711 } | |
3712 } | |
3713 } | |
3714 | |
3715 // at-exit methods are called in the reverse order of their registration. | |
3716 // atexit functions are called on return from main or as a result of a | |
3717 // call to exit(3C). There can be only 32 of these functions registered | |
3718 // and atexit() does not set errno. | |
3719 | |
3720 if (PerfAllowAtExitRegistration) { | |
3721 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
3722 // atexit functions can be delayed until process exit time, which | |
3723 // can be problematic for embedded VM situations. Embedded VMs should | |
3724 // call DestroyJavaVM() to assure that VM resources are released. | |
3725 | |
3726 // note: perfMemory_exit_helper atexit function may be removed in | |
3727 // the future if the appropriate cleanup code can be added to the | |
3728 // VM_Exit VMOperation's doit method. | |
3729 if (atexit(perfMemory_exit_helper) != 0) { | |
3730 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
3731 } | |
3732 } | |
3733 | |
3734 // initialize thread priority policy | |
3735 prio_init(); | |
3736 | |
4006 | 3737 #ifdef __APPLE__ |
3738 // dynamically link to objective c gc registration | |
3739 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
3740 if (handleLibObjc != NULL) { | |
3741 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
3742 } | |
3743 #endif | |
3744 | |
3960 | 3745 return JNI_OK; |
3746 } | |
3747 | |
3748 // this is called at the end of vm_initialization | |
3749 void os::init_3(void) { } | |
3750 | |
3751 // Mark the polling page as unreadable | |
3752 void os::make_polling_page_unreadable(void) { | |
3753 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
3754 fatal("Could not disable polling page"); | |
3755 }; | |
3756 | |
3757 // Mark the polling page as readable | |
3758 void os::make_polling_page_readable(void) { | |
3759 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
3760 fatal("Could not enable polling page"); | |
3761 } | |
3762 }; | |
3763 | |
3764 int os::active_processor_count() { | |
3765 return _processor_count; | |
3766 } | |
3767 | |
4006 | 3768 void os::set_native_thread_name(const char *name) { |
3769 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
3770 // This is only supported in Snow Leopard and beyond | |
3771 if (name != NULL) { | |
3772 // Add a "Java: " prefix to the name | |
3773 char buf[MAXTHREADNAMESIZE]; | |
3774 snprintf(buf, sizeof(buf), "Java: %s", name); | |
3775 pthread_setname_np(buf); | |
3776 } | |
3777 #endif | |
3778 } | |
3779 | |
3960 | 3780 bool os::distribute_processes(uint length, uint* distribution) { |
3781 // Not yet implemented. | |
3782 return false; | |
3783 } | |
3784 | |
3785 bool os::bind_to_processor(uint processor_id) { | |
3786 // Not yet implemented. | |
3787 return false; | |
3788 } | |
3789 | |
10405 | 3790 void os::SuspendedThreadTask::internal_do_task() { |
3791 if (do_suspend(_thread->osthread())) { | |
3792 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
3793 do_task(context); | |
3794 do_resume(_thread->osthread()); | |
3795 } | |
3796 } | |
3797 | |
3960 | 3798 /// |
10405 | 3799 class PcFetcher : public os::SuspendedThreadTask { |
3800 public: | |
3801 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
3802 ExtendedPC result(); | |
3803 protected: | |
3804 void do_task(const os::SuspendedThreadTaskContext& context); | |
3805 private: | |
3806 ExtendedPC _epc; | |
3807 }; | |
3808 | |
3809 ExtendedPC PcFetcher::result() { | |
3810 guarantee(is_done(), "task is not done yet."); | |
3811 return _epc; | |
3812 } | |
3813 | |
3814 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
3815 Thread* thread = context.thread(); | |
3816 OSThread* osthread = thread->osthread(); | |
3817 if (osthread->ucontext() != NULL) { | |
3818 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
3819 } else { | |
3820 // NULL context is unexpected, double-check this is the VMThread | |
3821 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
3822 } | |
3823 } | |
3960 | 3824 |
3825 // Suspends the target using the signal mechanism and then grabs the PC before | |
3826 // resuming the target. Used by the flat-profiler only | |
3827 ExtendedPC os::get_thread_pc(Thread* thread) { | |
3828 // Make sure that it is called by the watcher for the VMThread | |
3829 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
3830 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
3831 | |
10405 | 3832 PcFetcher fetcher(thread); |
3833 fetcher.run(); | |
3834 return fetcher.result(); | |
3960 | 3835 } |
3836 | |
3837 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
3838 { | |
3839 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
3840 } | |
3841 | |
3842 //////////////////////////////////////////////////////////////////////////////// | |
3843 // debug support | |
3844 | |
3845 bool os::find(address addr, outputStream* st) { | |
3846 Dl_info dlinfo; | |
3847 memset(&dlinfo, 0, sizeof(dlinfo)); | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3848 if (dladdr(addr, &dlinfo) != 0) { |
3960 | 3849 st->print(PTR_FORMAT ": ", addr); |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3850 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
3960 | 3851 st->print("%s+%#x", dlinfo.dli_sname, |
3852 addr - (intptr_t)dlinfo.dli_saddr); | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3853 } else if (dlinfo.dli_fbase != NULL) { |
3960 | 3854 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
3855 } else { | |
3856 st->print("<absolute address>"); | |
3857 } | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3858 if (dlinfo.dli_fname != NULL) { |
3960 | 3859 st->print(" in %s", dlinfo.dli_fname); |
3860 } | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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3861 if (dlinfo.dli_fbase != NULL) { |
3960 | 3862 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
3863 } | |
3864 st->cr(); | |
3865 | |
3866 if (Verbose) { | |
3867 // decode some bytes around the PC | |
9060
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3868 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
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3869 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
3960 | 3870 address lowest = (address) dlinfo.dli_sname; |
3871 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
3872 if (begin < lowest) begin = lowest; | |
3873 Dl_info dlinfo2; | |
11092
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3874 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
3960 | 3875 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
3876 end = (address) dlinfo2.dli_saddr; | |
3877 Disassembler::decode(begin, end, st); | |
3878 } | |
3879 return true; | |
3880 } | |
3881 return false; | |
3882 } | |
3883 | |
3884 //////////////////////////////////////////////////////////////////////////////// | |
3885 // misc | |
3886 | |
3887 // This does not do anything on Bsd. This is basically a hook for being | |
3888 // able to use structured exception handling (thread-local exception filters) | |
3889 // on, e.g., Win32. | |
3890 void | |
3891 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
3892 JavaCallArguments* args, Thread* thread) { | |
3893 f(value, method, args, thread); | |
3894 } | |
3895 | |
3896 void os::print_statistics() { | |
3897 } | |
3898 | |
3899 int os::message_box(const char* title, const char* message) { | |
3900 int i; | |
3901 fdStream err(defaultStream::error_fd()); | |
3902 for (i = 0; i < 78; i++) err.print_raw("="); | |
3903 err.cr(); | |
3904 err.print_raw_cr(title); | |
3905 for (i = 0; i < 78; i++) err.print_raw("-"); | |
3906 err.cr(); | |
3907 err.print_raw_cr(message); | |
3908 for (i = 0; i < 78; i++) err.print_raw("="); | |
3909 err.cr(); | |
3910 | |
3911 char buf[16]; | |
3912 // Prevent process from exiting upon "read error" without consuming all CPU | |
3913 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
3914 | |
3915 return buf[0] == 'y' || buf[0] == 'Y'; | |
3916 } | |
3917 | |
3918 int os::stat(const char *path, struct stat *sbuf) { | |
3919 char pathbuf[MAX_PATH]; | |
3920 if (strlen(path) > MAX_PATH - 1) { | |
3921 errno = ENAMETOOLONG; | |
3922 return -1; | |
3923 } | |
3924 os::native_path(strcpy(pathbuf, path)); | |
3925 return ::stat(pathbuf, sbuf); | |
3926 } | |
3927 | |
3928 bool os::check_heap(bool force) { | |
3929 return true; | |
3930 } | |
3931 | |
3932 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
3933 return ::vsnprintf(buf, count, format, args); | |
3934 } | |
3935 | |
3936 // Is a (classpath) directory empty? | |
3937 bool os::dir_is_empty(const char* path) { | |
3938 DIR *dir = NULL; | |
3939 struct dirent *ptr; | |
3940 | |
3941 dir = opendir(path); | |
3942 if (dir == NULL) return true; | |
3943 | |
3944 /* Scan the directory */ | |
3945 bool result = true; | |
3946 char buf[sizeof(struct dirent) + MAX_PATH]; | |
3947 while (result && (ptr = ::readdir(dir)) != NULL) { | |
3948 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
3949 result = false; | |
3950 } | |
3951 } | |
3952 closedir(dir); | |
3953 return result; | |
3954 } | |
3955 | |
3956 // This code originates from JDK's sysOpen and open64_w | |
3957 // from src/solaris/hpi/src/system_md.c | |
3958 | |
3959 #ifndef O_DELETE | |
3960 #define O_DELETE 0x10000 | |
3961 #endif | |
3962 | |
3963 // Open a file. Unlink the file immediately after open returns | |
3964 // if the specified oflag has the O_DELETE flag set. | |
3965 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
3966 | |
3967 int os::open(const char *path, int oflag, int mode) { | |
3968 | |
3969 if (strlen(path) > MAX_PATH - 1) { | |
3970 errno = ENAMETOOLONG; | |
3971 return -1; | |
3972 } | |
3973 int fd; | |
3974 int o_delete = (oflag & O_DELETE); | |
3975 oflag = oflag & ~O_DELETE; | |
3976 | |
3977 fd = ::open(path, oflag, mode); | |
3978 if (fd == -1) return -1; | |
3979 | |
3980 //If the open succeeded, the file might still be a directory | |
3981 { | |
3982 struct stat buf; | |
3983 int ret = ::fstat(fd, &buf); | |
3984 int st_mode = buf.st_mode; | |
3985 | |
3986 if (ret != -1) { | |
3987 if ((st_mode & S_IFMT) == S_IFDIR) { | |
3988 errno = EISDIR; | |
3989 ::close(fd); | |
3990 return -1; | |
3991 } | |
3992 } else { | |
3993 ::close(fd); | |
3994 return -1; | |
3995 } | |
3996 } | |
3997 | |
3998 /* | |
3999 * All file descriptors that are opened in the JVM and not | |
4000 * specifically destined for a subprocess should have the | |
4001 * close-on-exec flag set. If we don't set it, then careless 3rd | |
4002 * party native code might fork and exec without closing all | |
4003 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
4004 * UNIXProcess.c), and this in turn might: | |
4005 * | |
4006 * - cause end-of-file to fail to be detected on some file | |
4007 * descriptors, resulting in mysterious hangs, or | |
4008 * | |
4009 * - might cause an fopen in the subprocess to fail on a system | |
4010 * suffering from bug 1085341. | |
4011 * | |
4012 * (Yes, the default setting of the close-on-exec flag is a Unix | |
4013 * design flaw) | |
4014 * | |
4015 * See: | |
4016 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
4017 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
4018 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
4019 */ | |
4020 #ifdef FD_CLOEXEC | |
4021 { | |
4022 int flags = ::fcntl(fd, F_GETFD); | |
4023 if (flags != -1) | |
4024 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
4025 } | |
4026 #endif | |
4027 | |
4028 if (o_delete != 0) { | |
4029 ::unlink(path); | |
4030 } | |
4031 return fd; | |
4032 } | |
4033 | |
4034 | |
4035 // create binary file, rewriting existing file if required | |
4036 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
4037 int oflags = O_WRONLY | O_CREAT; | |
4038 if (!rewrite_existing) { | |
4039 oflags |= O_EXCL; | |
4040 } | |
4041 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
4042 } | |
4043 | |
4044 // return current position of file pointer | |
4045 jlong os::current_file_offset(int fd) { | |
4046 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
4047 } | |
4048 | |
4049 // move file pointer to the specified offset | |
4050 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
4051 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
4052 } | |
4053 | |
4054 // This code originates from JDK's sysAvailable | |
4055 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
4056 | |
4057 int os::available(int fd, jlong *bytes) { | |
4058 jlong cur, end; | |
4059 int mode; | |
4060 struct stat buf; | |
4061 | |
4062 if (::fstat(fd, &buf) >= 0) { | |
4063 mode = buf.st_mode; | |
4064 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
4065 /* | |
4066 * XXX: is the following call interruptible? If so, this might | |
4067 * need to go through the INTERRUPT_IO() wrapper as for other | |
4068 * blocking, interruptible calls in this file. | |
4069 */ | |
4070 int n; | |
4071 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
4072 *bytes = n; | |
4073 return 1; | |
4074 } | |
4075 } | |
4076 } | |
4077 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
4078 return 0; | |
4079 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
4080 return 0; | |
4081 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
4082 return 0; | |
4083 } | |
4084 *bytes = end - cur; | |
4085 return 1; | |
4086 } | |
4087 | |
4088 int os::socket_available(int fd, jint *pbytes) { | |
4089 if (fd < 0) | |
4090 return OS_OK; | |
4091 | |
4092 int ret; | |
4093 | |
4094 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
4095 | |
4096 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
4097 // is expected to return 0 on failure and 1 on success to the jdk. | |
4098 | |
4099 return (ret == OS_ERR) ? 0 : 1; | |
4100 } | |
4101 | |
4102 // Map a block of memory. | |
6197 | 4103 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 4104 char *addr, size_t bytes, bool read_only, |
4105 bool allow_exec) { | |
4106 int prot; | |
4107 int flags; | |
4108 | |
4109 if (read_only) { | |
4110 prot = PROT_READ; | |
4111 flags = MAP_SHARED; | |
4112 } else { | |
4113 prot = PROT_READ | PROT_WRITE; | |
4114 flags = MAP_PRIVATE; | |
4115 } | |
4116 | |
4117 if (allow_exec) { | |
4118 prot |= PROT_EXEC; | |
4119 } | |
4120 | |
4121 if (addr != NULL) { | |
4122 flags |= MAP_FIXED; | |
4123 } | |
4124 | |
4125 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
4126 fd, file_offset); | |
4127 if (mapped_address == MAP_FAILED) { | |
4128 return NULL; | |
4129 } | |
4130 return mapped_address; | |
4131 } | |
4132 | |
4133 | |
4134 // Remap a block of memory. | |
6197 | 4135 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 4136 char *addr, size_t bytes, bool read_only, |
4137 bool allow_exec) { | |
4138 // same as map_memory() on this OS | |
4139 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
4140 allow_exec); | |
4141 } | |
4142 | |
4143 | |
4144 // Unmap a block of memory. | |
6197 | 4145 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
3960 | 4146 return munmap(addr, bytes) == 0; |
4147 } | |
4148 | |
4149 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
4150 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
4151 // of a thread. | |
4152 // | |
4153 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
4154 // the fast estimate available on the platform. | |
4155 | |
4156 jlong os::current_thread_cpu_time() { | |
4157 #ifdef __APPLE__ | |
4158 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
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|
4159 #else |
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|
4160 Unimplemented(); |
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4161 return 0; |
3960 | 4162 #endif |
4163 } | |
4164 | |
4165 jlong os::thread_cpu_time(Thread* thread) { | |
8689
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4166 #ifdef __APPLE__ |
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4167 return os::thread_cpu_time(thread, true /* user + sys */); |
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|
4168 #else |
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|
4169 Unimplemented(); |
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4170 return 0; |
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|
4171 #endif |
3960 | 4172 } |
4173 | |
4174 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
4175 #ifdef __APPLE__ | |
4176 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
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4177 #else |
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4178 Unimplemented(); |
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4179 return 0; |
3960 | 4180 #endif |
4181 } | |
4182 | |
4183 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4184 #ifdef __APPLE__ | |
4185 struct thread_basic_info tinfo; | |
4186 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
4187 kern_return_t kr; | |
4961
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4188 thread_t mach_thread; |
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4189 |
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4190 mach_thread = thread->osthread()->thread_id(); |
3960 | 4191 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
4192 if (kr != KERN_SUCCESS) | |
4193 return -1; | |
4194 | |
4195 if (user_sys_cpu_time) { | |
4196 jlong nanos; | |
4197 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
4198 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
4199 return nanos; | |
4200 } else { | |
4201 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
4202 } | |
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4203 #else |
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4204 Unimplemented(); |
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4205 return 0; |
3960 | 4206 #endif |
4207 } | |
4208 | |
4209 | |
4210 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4211 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4212 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4213 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4214 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4215 } | |
4216 | |
4217 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4218 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4219 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4220 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4221 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4222 } | |
4223 | |
4224 bool os::is_thread_cpu_time_supported() { | |
4225 #ifdef __APPLE__ | |
4226 return true; | |
6918 | 4227 #else |
3960 | 4228 return false; |
4229 #endif | |
4230 } | |
4231 | |
4232 // System loadavg support. Returns -1 if load average cannot be obtained. | |
4233 // Bsd doesn't yet have a (official) notion of processor sets, | |
4234 // so just return the system wide load average. | |
4235 int os::loadavg(double loadavg[], int nelem) { | |
4236 return ::getloadavg(loadavg, nelem); | |
4237 } | |
4238 | |
4239 void os::pause() { | |
4240 char filename[MAX_PATH]; | |
4241 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
4242 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
4243 } else { | |
4244 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
4245 } | |
4246 | |
4247 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
4248 if (fd != -1) { | |
4249 struct stat buf; | |
4250 ::close(fd); | |
4251 while (::stat(filename, &buf) == 0) { | |
4252 (void)::poll(NULL, 0, 100); | |
4253 } | |
4254 } else { | |
4255 jio_fprintf(stderr, | |
4256 "Could not open pause file '%s', continuing immediately.\n", filename); | |
4257 } | |
4258 } | |
4259 | |
4260 | |
4261 // Refer to the comments in os_solaris.cpp park-unpark. | |
4262 // | |
4263 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
4264 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
4265 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
4266 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
4267 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
4268 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
4269 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
4270 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
4271 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
4272 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
4273 // of libpthread avoids the problem, but isn't practical. | |
4274 // | |
4275 // Possible remedies: | |
4276 // | |
4277 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
4278 // This is palliative and probabilistic, however. If the thread is preempted | |
4279 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
4280 // than the minimum period may have passed, and the abstime may be stale (in the | |
4281 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
4282 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
4283 // | |
4284 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4285 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4286 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4287 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4288 // thread. | |
4289 // | |
4290 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4291 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4292 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4293 // This also works well. In fact it avoids kernel-level scalability impediments | |
4294 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4295 // timers in a graceful fashion. | |
4296 // | |
4297 // 4. When the abstime value is in the past it appears that control returns | |
4298 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4299 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4300 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4301 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4302 // It may be possible to avoid reinitialization by checking the return | |
4303 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4304 // condvar we must establish the invariant that cond_signal() is only called | |
4305 // within critical sections protected by the adjunct mutex. This prevents | |
4306 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4307 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4308 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4309 // | |
4310 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4311 // structure when a condvar is used or initialized. cond_destroy() would | |
4312 // release the helper structure. Our reinitialize-after-timedwait fix | |
4313 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4314 // | |
4315 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4316 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4317 // and only enabling the work-around for vulnerable environments. | |
4318 | |
4319 // utility to compute the abstime argument to timedwait: | |
4320 // millis is the relative timeout time | |
4321 // abstime will be the absolute timeout time | |
4322 // TODO: replace compute_abstime() with unpackTime() | |
4323 | |
4324 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
4325 if (millis < 0) millis = 0; | |
4326 struct timeval now; | |
4327 int status = gettimeofday(&now, NULL); | |
4328 assert(status == 0, "gettimeofday"); | |
4329 jlong seconds = millis / 1000; | |
4330 millis %= 1000; | |
4331 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4332 seconds = 50000000; | |
4333 } | |
4334 abstime->tv_sec = now.tv_sec + seconds; | |
4335 long usec = now.tv_usec + millis * 1000; | |
4336 if (usec >= 1000000) { | |
4337 abstime->tv_sec += 1; | |
4338 usec -= 1000000; | |
4339 } | |
4340 abstime->tv_nsec = usec * 1000; | |
4341 return abstime; | |
4342 } | |
4343 | |
4344 | |
4345 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4346 // Conceptually TryPark() should be equivalent to park(0). | |
4347 | |
4348 int os::PlatformEvent::TryPark() { | |
4349 for (;;) { | |
4350 const int v = _Event ; | |
4351 guarantee ((v == 0) || (v == 1), "invariant") ; | |
4352 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
4353 } | |
4354 } | |
4355 | |
4356 void os::PlatformEvent::park() { // AKA "down()" | |
4357 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4358 // may call park(). | |
4359 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4360 int v ; | |
4361 for (;;) { | |
4362 v = _Event ; | |
4363 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4364 } | |
4365 guarantee (v >= 0, "invariant") ; | |
4366 if (v == 0) { | |
4367 // Do this the hard way by blocking ... | |
4368 int status = pthread_mutex_lock(_mutex); | |
4369 assert_status(status == 0, status, "mutex_lock"); | |
4370 guarantee (_nParked == 0, "invariant") ; | |
4371 ++ _nParked ; | |
4372 while (_Event < 0) { | |
4373 status = pthread_cond_wait(_cond, _mutex); | |
4374 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
4375 // Treat this the same as if the wait was interrupted | |
4376 if (status == ETIMEDOUT) { status = EINTR; } | |
4377 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
4378 } | |
4379 -- _nParked ; | |
4380 | |
4381 _Event = 0 ; | |
4382 status = pthread_mutex_unlock(_mutex); | |
4383 assert_status(status == 0, status, "mutex_unlock"); | |
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4384 // Paranoia to ensure our locked and lock-free paths interact |
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4385 // correctly with each other. |
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4386 OrderAccess::fence(); |
3960 | 4387 } |
4388 guarantee (_Event >= 0, "invariant") ; | |
4389 } | |
4390 | |
4391 int os::PlatformEvent::park(jlong millis) { | |
4392 guarantee (_nParked == 0, "invariant") ; | |
4393 | |
4394 int v ; | |
4395 for (;;) { | |
4396 v = _Event ; | |
4397 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4398 } | |
4399 guarantee (v >= 0, "invariant") ; | |
4400 if (v != 0) return OS_OK ; | |
4401 | |
4402 // We do this the hard way, by blocking the thread. | |
4403 // Consider enforcing a minimum timeout value. | |
4404 struct timespec abst; | |
4405 compute_abstime(&abst, millis); | |
4406 | |
4407 int ret = OS_TIMEOUT; | |
4408 int status = pthread_mutex_lock(_mutex); | |
4409 assert_status(status == 0, status, "mutex_lock"); | |
4410 guarantee (_nParked == 0, "invariant") ; | |
4411 ++_nParked ; | |
4412 | |
4413 // Object.wait(timo) will return because of | |
4414 // (a) notification | |
4415 // (b) timeout | |
4416 // (c) thread.interrupt | |
4417 // | |
4418 // Thread.interrupt and object.notify{All} both call Event::set. | |
4419 // That is, we treat thread.interrupt as a special case of notification. | |
4420 // The underlying Solaris implementation, cond_timedwait, admits | |
4421 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4422 // JVM from making those visible to Java code. As such, we must | |
4423 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4424 // | |
4425 // TODO: properly differentiate simultaneous notify+interrupt. | |
4426 // In that case, we should propagate the notify to another waiter. | |
4427 | |
4428 while (_Event < 0) { | |
4429 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
4430 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4431 pthread_cond_destroy (_cond); | |
4432 pthread_cond_init (_cond, NULL) ; | |
4433 } | |
4434 assert_status(status == 0 || status == EINTR || | |
4435 status == ETIMEDOUT, | |
4436 status, "cond_timedwait"); | |
4437 if (!FilterSpuriousWakeups) break ; // previous semantics | |
4438 if (status == ETIMEDOUT) break ; | |
4439 // We consume and ignore EINTR and spurious wakeups. | |
4440 } | |
4441 --_nParked ; | |
4442 if (_Event >= 0) { | |
4443 ret = OS_OK; | |
4444 } | |
4445 _Event = 0 ; | |
4446 status = pthread_mutex_unlock(_mutex); | |
4447 assert_status(status == 0, status, "mutex_unlock"); | |
4448 assert (_nParked == 0, "invariant") ; | |
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4449 // Paranoia to ensure our locked and lock-free paths interact |
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4450 // correctly with each other. |
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4451 OrderAccess::fence(); |
3960 | 4452 return ret; |
4453 } | |
4454 | |
4455 void os::PlatformEvent::unpark() { | |
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4456 // Transitions for _Event: |
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4457 // 0 :=> 1 |
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4458 // 1 :=> 1 |
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4459 // -1 :=> either 0 or 1; must signal target thread |
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4460 // That is, we can safely transition _Event from -1 to either |
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4461 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4462 // unpark() calls. |
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4463 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4464 // |
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4465 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4466 // that it will take two back-to-back park() calls for the owning |
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4467 // thread to block. This has the benefit of forcing a spurious return |
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4468 // from the first park() call after an unpark() call which will help |
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4469 // shake out uses of park() and unpark() without condition variables. |
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4470 |
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4471 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4472 |
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4473 // Wait for the thread associated with the event to vacate |
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4474 int status = pthread_mutex_lock(_mutex); |
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4475 assert_status(status == 0, status, "mutex_lock"); |
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4476 int AnyWaiters = _nParked; |
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4477 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4478 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4479 AnyWaiters = 0; |
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4480 pthread_cond_signal(_cond); |
3960 | 4481 } |
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4482 status = pthread_mutex_unlock(_mutex); |
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4483 assert_status(status == 0, status, "mutex_unlock"); |
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4484 if (AnyWaiters != 0) { |
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4485 status = pthread_cond_signal(_cond); |
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4486 assert_status(status == 0, status, "cond_signal"); |
3960 | 4487 } |
4488 | |
4489 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4490 // This is safe and avoids a common class of futile wakeups. In rare | |
4491 // circumstances this can cause a thread to return prematurely from | |
4492 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4493 // simply re-test the condition and re-park itself. | |
4494 } | |
4495 | |
4496 | |
4497 // JSR166 | |
4498 // ------------------------------------------------------- | |
4499 | |
4500 /* | |
4501 * The solaris and bsd implementations of park/unpark are fairly | |
4502 * conservative for now, but can be improved. They currently use a | |
4503 * mutex/condvar pair, plus a a count. | |
4504 * Park decrements count if > 0, else does a condvar wait. Unpark | |
4505 * sets count to 1 and signals condvar. Only one thread ever waits | |
4506 * on the condvar. Contention seen when trying to park implies that someone | |
4507 * is unparking you, so don't wait. And spurious returns are fine, so there | |
4508 * is no need to track notifications. | |
4509 */ | |
4510 | |
4511 #define MAX_SECS 100000000 | |
4512 /* | |
4513 * This code is common to bsd and solaris and will be moved to a | |
4514 * common place in dolphin. | |
4515 * | |
4516 * The passed in time value is either a relative time in nanoseconds | |
4517 * or an absolute time in milliseconds. Either way it has to be unpacked | |
4518 * into suitable seconds and nanoseconds components and stored in the | |
4519 * given timespec structure. | |
4520 * Given time is a 64-bit value and the time_t used in the timespec is only | |
4521 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
4522 * overflow if times way in the future are given. Further on Solaris versions | |
4523 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
4524 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
4525 * As it will be 28 years before "now + 100000000" will overflow we can | |
4526 * ignore overflow and just impose a hard-limit on seconds using the value | |
4527 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
4528 * years from "now". | |
4529 */ | |
4530 | |
4531 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
4532 assert (time > 0, "convertTime"); | |
4533 | |
4534 struct timeval now; | |
4535 int status = gettimeofday(&now, NULL); | |
4536 assert(status == 0, "gettimeofday"); | |
4537 | |
4538 time_t max_secs = now.tv_sec + MAX_SECS; | |
4539 | |
4540 if (isAbsolute) { | |
4541 jlong secs = time / 1000; | |
4542 if (secs > max_secs) { | |
4543 absTime->tv_sec = max_secs; | |
4544 } | |
4545 else { | |
4546 absTime->tv_sec = secs; | |
4547 } | |
4548 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
4549 } | |
4550 else { | |
4551 jlong secs = time / NANOSECS_PER_SEC; | |
4552 if (secs >= MAX_SECS) { | |
4553 absTime->tv_sec = max_secs; | |
4554 absTime->tv_nsec = 0; | |
4555 } | |
4556 else { | |
4557 absTime->tv_sec = now.tv_sec + secs; | |
4558 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
4559 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
4560 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
4561 ++absTime->tv_sec; // note: this must be <= max_secs | |
4562 } | |
4563 } | |
4564 } | |
4565 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
4566 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
4567 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
4568 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
4569 } | |
4570 | |
4571 void Parker::park(bool isAbsolute, jlong time) { | |
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4572 // Ideally we'd do something useful while spinning, such |
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4573 // as calling unpackTime(). |
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4574 |
3960 | 4575 // Optional fast-path check: |
4576 // Return immediately if a permit is available. | |
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4577 // We depend on Atomic::xchg() having full barrier semantics |
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4578 // since we are doing a lock-free update to _counter. |
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4579 if (Atomic::xchg(0, &_counter) > 0) return; |
3960 | 4580 |
4581 Thread* thread = Thread::current(); | |
4582 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
4583 JavaThread *jt = (JavaThread *)thread; | |
4584 | |
4585 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
4586 // Check interrupt before trying to wait | |
4587 if (Thread::is_interrupted(thread, false)) { | |
4588 return; | |
4589 } | |
4590 | |
4591 // Next, demultiplex/decode time arguments | |
4592 struct timespec absTime; | |
4593 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
4594 return; | |
4595 } | |
4596 if (time > 0) { | |
4597 unpackTime(&absTime, isAbsolute, time); | |
4598 } | |
4599 | |
4600 | |
4601 // Enter safepoint region | |
4602 // Beware of deadlocks such as 6317397. | |
4603 // The per-thread Parker:: mutex is a classic leaf-lock. | |
4604 // In particular a thread must never block on the Threads_lock while | |
4605 // holding the Parker:: mutex. If safepoints are pending both the | |
4606 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
4607 ThreadBlockInVM tbivm(jt); | |
4608 | |
4609 // Don't wait if cannot get lock since interference arises from | |
4610 // unblocking. Also. check interrupt before trying wait | |
4611 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
4612 return; | |
4613 } | |
4614 | |
4615 int status ; | |
4616 if (_counter > 0) { // no wait needed | |
4617 _counter = 0; | |
4618 status = pthread_mutex_unlock(_mutex); | |
4619 assert (status == 0, "invariant") ; | |
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4620 // Paranoia to ensure our locked and lock-free paths interact |
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4621 // correctly with each other and Java-level accesses. |
3960 | 4622 OrderAccess::fence(); |
4623 return; | |
4624 } | |
4625 | |
4626 #ifdef ASSERT | |
4627 // Don't catch signals while blocked; let the running threads have the signals. | |
4628 // (This allows a debugger to break into the running thread.) | |
4629 sigset_t oldsigs; | |
4630 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
4631 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
4632 #endif | |
4633 | |
4634 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
4635 jt->set_suspend_equivalent(); | |
4636 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
4637 | |
4638 if (time == 0) { | |
4639 status = pthread_cond_wait (_cond, _mutex) ; | |
4640 } else { | |
4641 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
4642 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4643 pthread_cond_destroy (_cond) ; | |
4644 pthread_cond_init (_cond, NULL); | |
4645 } | |
4646 } | |
4647 assert_status(status == 0 || status == EINTR || | |
4648 status == ETIMEDOUT, | |
4649 status, "cond_timedwait"); | |
4650 | |
4651 #ifdef ASSERT | |
4652 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
4653 #endif | |
4654 | |
4655 _counter = 0 ; | |
4656 status = pthread_mutex_unlock(_mutex) ; | |
4657 assert_status(status == 0, status, "invariant") ; | |
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4658 // Paranoia to ensure our locked and lock-free paths interact |
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4659 // correctly with each other and Java-level accesses. |
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4660 OrderAccess::fence(); |
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4661 |
3960 | 4662 // If externally suspended while waiting, re-suspend |
4663 if (jt->handle_special_suspend_equivalent_condition()) { | |
4664 jt->java_suspend_self(); | |
4665 } | |
4666 } | |
4667 | |
4668 void Parker::unpark() { | |
4669 int s, status ; | |
4670 status = pthread_mutex_lock(_mutex); | |
4671 assert (status == 0, "invariant") ; | |
4672 s = _counter; | |
4673 _counter = 1; | |
4674 if (s < 1) { | |
4675 if (WorkAroundNPTLTimedWaitHang) { | |
4676 status = pthread_cond_signal (_cond) ; | |
4677 assert (status == 0, "invariant") ; | |
4678 status = pthread_mutex_unlock(_mutex); | |
4679 assert (status == 0, "invariant") ; | |
4680 } else { | |
4681 status = pthread_mutex_unlock(_mutex); | |
4682 assert (status == 0, "invariant") ; | |
4683 status = pthread_cond_signal (_cond) ; | |
4684 assert (status == 0, "invariant") ; | |
4685 } | |
4686 } else { | |
4687 pthread_mutex_unlock(_mutex); | |
4688 assert (status == 0, "invariant") ; | |
4689 } | |
4690 } | |
4691 | |
4692 | |
4693 /* Darwin has no "environ" in a dynamic library. */ | |
4694 #ifdef __APPLE__ | |
4695 #include <crt_externs.h> | |
4696 #define environ (*_NSGetEnviron()) | |
4697 #else | |
4698 extern char** environ; | |
4699 #endif | |
4700 | |
4701 // Run the specified command in a separate process. Return its exit value, | |
4702 // or -1 on failure (e.g. can't fork a new process). | |
4703 // Unlike system(), this function can be called from signal handler. It | |
4704 // doesn't block SIGINT et al. | |
4705 int os::fork_and_exec(char* cmd) { | |
4706 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
4707 | |
4708 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
4709 // pthread_atfork handlers and reset pthread library. All we need is a | |
4710 // separate process to execve. Make a direct syscall to fork process. | |
4711 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
4712 // the best... | |
4713 pid_t pid = fork(); | |
4714 | |
4715 if (pid < 0) { | |
4716 // fork failed | |
4717 return -1; | |
4718 | |
4719 } else if (pid == 0) { | |
4720 // child process | |
4721 | |
4722 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
4723 // first to kill every thread on the thread list. Because this list is | |
4724 // not reset by fork() (see notes above), execve() will instead kill | |
4725 // every thread in the parent process. We know this is the only thread | |
4726 // in the new process, so make a system call directly. | |
4727 // IA64 should use normal execve() from glibc to match the glibc fork() | |
4728 // above. | |
4729 execve("/bin/sh", (char* const*)argv, environ); | |
4730 | |
4731 // execve failed | |
4732 _exit(-1); | |
4733 | |
4734 } else { | |
4735 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
4736 // care about the actual exit code, for now. | |
4737 | |
4738 int status; | |
4739 | |
4740 // Wait for the child process to exit. This returns immediately if | |
4741 // the child has already exited. */ | |
4742 while (waitpid(pid, &status, 0) < 0) { | |
4743 switch (errno) { | |
4744 case ECHILD: return 0; | |
4745 case EINTR: break; | |
4746 default: return -1; | |
4747 } | |
4748 } | |
4749 | |
4750 if (WIFEXITED(status)) { | |
4751 // The child exited normally; get its exit code. | |
4752 return WEXITSTATUS(status); | |
4753 } else if (WIFSIGNALED(status)) { | |
4754 // The child exited because of a signal | |
4755 // The best value to return is 0x80 + signal number, | |
4756 // because that is what all Unix shells do, and because | |
4757 // it allows callers to distinguish between process exit and | |
4758 // process death by signal. | |
4759 return 0x80 + WTERMSIG(status); | |
4760 } else { | |
4761 // Unknown exit code; pass it through | |
4762 return status; | |
4763 } | |
4764 } | |
4765 } | |
4766 | |
4767 // is_headless_jre() | |
4768 // | |
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4769 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
3960 | 4770 // in order to report if we are running in a headless jre |
4771 // | |
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4772 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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4773 // as libawt.so, and renamed libawt_xawt.so |
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4774 // |
3960 | 4775 bool os::is_headless_jre() { |
12990 | 4776 #ifdef __APPLE__ |
4777 // We no longer build headless-only on Mac OS X | |
4778 return false; | |
4779 #else | |
3960 | 4780 struct stat statbuf; |
4781 char buf[MAXPATHLEN]; | |
4782 char libmawtpath[MAXPATHLEN]; | |
4006 | 4783 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
5921 | 4784 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
3960 | 4785 char *p; |
4786 | |
4787 // Get path to libjvm.so | |
4788 os::jvm_path(buf, sizeof(buf)); | |
4789 | |
4790 // Get rid of libjvm.so | |
4791 p = strrchr(buf, '/'); | |
4792 if (p == NULL) return false; | |
4793 else *p = '\0'; | |
4794 | |
4795 // Get rid of client or server | |
4796 p = strrchr(buf, '/'); | |
4797 if (p == NULL) return false; | |
4798 else *p = '\0'; | |
4799 | |
4800 // check xawt/libmawt.so | |
4801 strcpy(libmawtpath, buf); | |
4802 strcat(libmawtpath, xawtstr); | |
4803 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
4804 | |
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4805 // check libawt_xawt.so |
3960 | 4806 strcpy(libmawtpath, buf); |
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4807 strcat(libmawtpath, new_xawtstr); |
3960 | 4808 if (::stat(libmawtpath, &statbuf) == 0) return false; |
4809 | |
4810 return true; | |
12990 | 4811 #endif |
3960 | 4812 } |
6200
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4813 |
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4814 // Get the default path to the core file |
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4815 // Returns the length of the string |
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|
4816 int os::get_core_path(char* buffer, size_t bufferSize) { |
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4817 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
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4818 |
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4819 // Truncate if theoretical string was longer than bufferSize |
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4820 n = MIN2(n, (int)bufferSize); |
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4821 |
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4822 return n; |
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|
4823 } |
10405 | 4824 |
12110
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|
4825 #ifndef PRODUCT |
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|
4826 void TestReserveMemorySpecial_test() { |
4c84d351cca9
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|
4827 // No tests available for this platform |
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|
4828 } |
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|
4829 #endif |