Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 17905:4e03f6196358
8041947: new hotspot build - hs25.20-b13
Reviewed-by: jcoomes
author | amurillo |
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date | Fri, 25 Apr 2014 09:22:42 -0700 |
parents | 6048424d3865 |
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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 | |
130 | |
131 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
132 pthread_t os::Bsd::_main_thread; | |
133 int os::Bsd::_page_size = -1; | |
134 | |
135 static jlong initial_time_count=0; | |
136 | |
137 static int clock_tics_per_sec = 100; | |
138 | |
139 // For diagnostics to print a message once. see run_periodic_checks | |
140 static sigset_t check_signal_done; | |
6918 | 141 static bool check_signals = true; |
3960 | 142 |
143 static pid_t _initial_pid = 0; | |
144 | |
145 /* Signal number used to suspend/resume a thread */ | |
146 | |
147 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
148 static int SR_signum = SIGUSR2; | |
149 sigset_t SR_sigset; | |
150 | |
151 | |
152 //////////////////////////////////////////////////////////////////////////////// | |
153 // utility functions | |
154 | |
155 static int SR_initialize(); | |
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156 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); |
3960 | 157 |
158 julong os::available_memory() { | |
159 return Bsd::available_memory(); | |
160 } | |
161 | |
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162 // available here means free |
3960 | 163 julong os::Bsd::available_memory() { |
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164 uint64_t available = physical_memory() >> 2; |
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165 #ifdef __APPLE__ |
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166 mach_msg_type_number_t count = HOST_VM_INFO64_COUNT; |
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167 vm_statistics64_data_t vmstat; |
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168 kern_return_t kerr = host_statistics64(mach_host_self(), HOST_VM_INFO64, |
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169 (host_info64_t)&vmstat, &count); |
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170 assert(kerr == KERN_SUCCESS, |
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171 "host_statistics64 failed - check mach_host_self() and count"); |
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172 if (kerr == KERN_SUCCESS) { |
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173 available = vmstat.free_count * os::vm_page_size(); |
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174 } |
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175 #endif |
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176 return available; |
3960 | 177 } |
178 | |
179 julong os::physical_memory() { | |
180 return Bsd::physical_memory(); | |
181 } | |
182 | |
183 //////////////////////////////////////////////////////////////////////////////// | |
184 // environment support | |
185 | |
186 bool os::getenv(const char* name, char* buf, int len) { | |
187 const char* val = ::getenv(name); | |
188 if (val != NULL && strlen(val) < (size_t)len) { | |
189 strcpy(buf, val); | |
190 return true; | |
191 } | |
192 if (len > 0) buf[0] = 0; // return a null string | |
193 return false; | |
194 } | |
195 | |
196 | |
197 // Return true if user is running as root. | |
198 | |
199 bool os::have_special_privileges() { | |
200 static bool init = false; | |
201 static bool privileges = false; | |
202 if (!init) { | |
203 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
204 init = true; | |
205 } | |
206 return privileges; | |
207 } | |
208 | |
209 | |
210 | |
211 // Cpu architecture string | |
212 #if defined(ZERO) | |
213 static char cpu_arch[] = ZERO_LIBARCH; | |
214 #elif defined(IA64) | |
215 static char cpu_arch[] = "ia64"; | |
216 #elif defined(IA32) | |
217 static char cpu_arch[] = "i386"; | |
218 #elif defined(AMD64) | |
219 static char cpu_arch[] = "amd64"; | |
220 #elif defined(ARM) | |
221 static char cpu_arch[] = "arm"; | |
14390 | 222 #elif defined(PPC32) |
3960 | 223 static char cpu_arch[] = "ppc"; |
224 #elif defined(SPARC) | |
225 # ifdef _LP64 | |
226 static char cpu_arch[] = "sparcv9"; | |
227 # else | |
228 static char cpu_arch[] = "sparc"; | |
229 # endif | |
230 #else | |
231 #error Add appropriate cpu_arch setting | |
232 #endif | |
233 | |
4846 | 234 // Compiler variant |
235 #ifdef COMPILER2 | |
236 #define COMPILER_VARIANT "server" | |
237 #else | |
238 #define COMPILER_VARIANT "client" | |
239 #endif | |
3960 | 240 |
6918 | 241 |
3960 | 242 void os::Bsd::initialize_system_info() { |
243 int mib[2]; | |
244 size_t len; | |
245 int cpu_val; | |
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246 julong mem_val; |
3960 | 247 |
248 /* get processors count via hw.ncpus sysctl */ | |
249 mib[0] = CTL_HW; | |
250 mib[1] = HW_NCPU; | |
251 len = sizeof(cpu_val); | |
252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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253 assert(len == sizeof(cpu_val), "unexpected data size"); |
3960 | 254 set_processor_count(cpu_val); |
255 } | |
256 else { | |
257 set_processor_count(1); // fallback | |
258 } | |
259 | |
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260 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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261 * since it returns a 64 bit value) |
3960 | 262 */ |
263 mib[0] = CTL_HW; | |
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264 |
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265 #if defined (HW_MEMSIZE) // Apple |
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266 mib[1] = HW_MEMSIZE; |
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267 #elif defined(HW_PHYSMEM) // Most of BSD |
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268 mib[1] = HW_PHYSMEM; |
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269 #elif defined(HW_REALMEM) // Old FreeBSD |
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270 mib[1] = HW_REALMEM; |
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271 #else |
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272 #error No ways to get physmem |
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273 #endif |
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274 |
3960 | 275 len = sizeof(mem_val); |
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276 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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277 assert(len == sizeof(mem_val), "unexpected data size"); |
3960 | 278 _physical_memory = mem_val; |
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279 } else { |
3960 | 280 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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281 } |
3960 | 282 |
283 #ifdef __OpenBSD__ | |
284 { | |
285 // limit _physical_memory memory view on OpenBSD since | |
286 // datasize rlimit restricts us anyway. | |
287 struct rlimit limits; | |
288 getrlimit(RLIMIT_DATA, &limits); | |
289 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
290 } | |
291 #endif | |
292 } | |
293 | |
4006 | 294 #ifdef __APPLE__ |
295 static const char *get_home() { | |
296 const char *home_dir = ::getenv("HOME"); | |
297 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
298 struct passwd *passwd_info = getpwuid(geteuid()); | |
299 if (passwd_info != NULL) { | |
300 home_dir = passwd_info->pw_dir; | |
301 } | |
302 } | |
303 | |
304 return home_dir; | |
305 } | |
306 #endif | |
307 | |
3960 | 308 void os::init_system_properties_values() { |
309 // The next steps are taken in the product version: | |
310 // | |
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311 // Obtain the JAVA_HOME value from the location of libjvm.so. |
3960 | 312 // This library should be located at: |
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313 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
3960 | 314 // |
315 // If "/jre/lib/" appears at the right place in the path, then we | |
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316 // assume libjvm.so is installed in a JDK and we use this path. |
3960 | 317 // |
318 // Otherwise exit with message: "Could not create the Java virtual machine." | |
319 // | |
320 // The following extra steps are taken in the debugging version: | |
321 // | |
322 // If "/jre/lib/" does NOT appear at the right place in the path | |
323 // instead of exit check for $JAVA_HOME environment variable. | |
324 // | |
325 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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326 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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327 // it looks like libjvm.so is installed there |
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328 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
3960 | 329 // |
330 // Otherwise exit. | |
331 // | |
332 // Important note: if the location of libjvm.so changes this | |
333 // code needs to be changed accordingly. | |
334 | |
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335 // See ld(1): |
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336 // The linker uses the following search paths to locate required |
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337 // shared libraries: |
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338 // 1: ... |
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339 // ... |
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340 // 7: The default directories, normally /lib and /usr/lib. |
3960 | 341 #ifndef DEFAULT_LIBPATH |
342 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
343 #endif | |
344 | |
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345 // Base path of extensions installed on the system. |
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346 #define SYS_EXT_DIR "/usr/java/packages" |
3960 | 347 #define EXTENSIONS_DIR "/lib/ext" |
348 #define ENDORSED_DIR "/lib/endorsed" | |
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349 |
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350 #ifndef __APPLE__ |
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351 |
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352 // Buffer that fits several sprintfs. |
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353 // Note that the space for the colon and the trailing null are provided |
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354 // by the nulls included by the sizeof operator. |
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355 const size_t bufsize = |
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356 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. |
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357 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR), // extensions dir |
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358 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir |
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359 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
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360 |
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361 // sysclasspath, java_home, dll_dir |
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362 { |
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363 char *pslash; |
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364 os::jvm_path(buf, bufsize); |
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365 |
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366 // Found the full path to libjvm.so. |
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367 // Now cut the path to <java_home>/jre if we can. |
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368 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
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369 pslash = strrchr(buf, '/'); |
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370 if (pslash != NULL) { |
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371 *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
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372 } |
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373 Arguments::set_dll_dir(buf); |
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374 |
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375 if (pslash != NULL) { |
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376 pslash = strrchr(buf, '/'); |
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377 if (pslash != NULL) { |
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378 *pslash = '\0'; // Get rid of /<arch>. |
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379 pslash = strrchr(buf, '/'); |
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380 if (pslash != NULL) { |
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381 *pslash = '\0'; // Get rid of /lib. |
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382 } |
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383 } |
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384 } |
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385 Arguments::set_java_home(buf); |
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386 set_boot_path('/', ':'); |
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387 } |
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388 |
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389 // Where to look for native libraries. |
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390 // |
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391 // Note: Due to a legacy implementation, most of the library path |
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392 // is set in the launcher. This was to accomodate linking restrictions |
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393 // on legacy Bsd implementations (which are no longer supported). |
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394 // Eventually, all the library path setting will be done here. |
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395 // |
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396 // However, to prevent the proliferation of improperly built native |
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397 // libraries, the new path component /usr/java/packages is added here. |
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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 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
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401 // should always exist (until the legacy problem cited above is |
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402 // addressed). |
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403 const char *v = ::getenv("LD_LIBRARY_PATH"); |
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404 const char *v_colon = ":"; |
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405 if (v == NULL) { v = ""; v_colon = ""; } |
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406 // That's +1 for the colon and +1 for the trailing '\0'. |
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407 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
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408 strlen(v) + 1 + |
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409 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH) + 1, |
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410 mtInternal); |
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411 sprintf(ld_library_path, "%s%s" SYS_EXT_DIR "/lib/%s:" DEFAULT_LIBPATH, v, v_colon, cpu_arch); |
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412 Arguments::set_library_path(ld_library_path); |
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413 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal); |
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414 } |
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415 |
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416 // Extensions directories. |
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417 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); |
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418 Arguments::set_ext_dirs(buf); |
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419 |
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420 // Endorsed standards default directory. |
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421 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); |
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422 Arguments::set_endorsed_dirs(buf); |
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423 |
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424 FREE_C_HEAP_ARRAY(char, buf, mtInternal); |
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425 |
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426 #else // __APPLE__ |
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427 |
4006 | 428 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" |
429 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
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430 |
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431 const char *user_home_dir = get_home(); |
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432 // The null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir. |
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433 size_t system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + |
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434 sizeof(SYS_EXTENSIONS_DIRS); |
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435 |
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436 // Buffer that fits several sprintfs. |
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437 // Note that the space for the colon and the trailing null are provided |
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438 // by the nulls included by the sizeof operator. |
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439 const size_t bufsize = |
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440 MAX3((size_t)MAXPATHLEN, // for dll_dir & friends. |
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441 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + system_ext_size, // extensions dir |
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442 (size_t)MAXPATHLEN + sizeof(ENDORSED_DIR)); // endorsed dir |
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443 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); |
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444 |
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445 // sysclasspath, java_home, dll_dir |
3960 | 446 { |
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447 char *pslash; |
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448 os::jvm_path(buf, bufsize); |
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449 |
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450 // Found the full path to libjvm.so. |
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451 // Now cut the path to <java_home>/jre if we can. |
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452 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. |
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453 pslash = strrchr(buf, '/'); |
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454 if (pslash != NULL) { |
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455 *pslash = '\0'; // Get rid of /{client|server|hotspot}. |
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456 } |
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457 Arguments::set_dll_dir(buf); |
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458 |
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459 if (pslash != NULL) { |
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460 pslash = strrchr(buf, '/'); |
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461 if (pslash != NULL) { |
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462 *pslash = '\0'; // Get rid of /lib. |
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463 } |
3960 | 464 } |
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465 Arguments::set_java_home(buf); |
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466 set_boot_path('/', ':'); |
3960 | 467 } |
468 | |
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469 // Where to look for native libraries. |
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470 // |
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471 // Note: Due to a legacy implementation, most of the library path |
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472 // is set in the launcher. This was to accomodate linking restrictions |
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473 // on legacy Bsd implementations (which are no longer supported). |
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474 // Eventually, all the library path setting will be done here. |
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475 // |
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476 // However, to prevent the proliferation of improperly built native |
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477 // libraries, the new path component /usr/java/packages is added here. |
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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 // Get the user setting of LD_LIBRARY_PATH, and prepended it. It |
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481 // should always exist (until the legacy problem cited above is |
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482 // addressed). |
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483 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code |
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484 // can specify a directory inside an app wrapper |
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485 const char *l = ::getenv("JAVA_LIBRARY_PATH"); |
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486 const char *l_colon = ":"; |
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487 if (l == NULL) { l = ""; l_colon = ""; } |
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488 |
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489 const char *v = ::getenv("DYLD_LIBRARY_PATH"); |
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490 const char *v_colon = ":"; |
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491 if (v == NULL) { v = ""; v_colon = ""; } |
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492 |
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493 // Apple's Java6 has "." at the beginning of java.library.path. |
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494 // OpenJDK on Windows has "." at the end of java.library.path. |
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495 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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496 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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497 // "." is appended to the end of java.library.path. Yes, this |
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498 // could cause a change in behavior, but Apple's Java6 behavior |
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499 // can be achieved by putting "." at the beginning of the |
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500 // JAVA_LIBRARY_PATH environment variable. |
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501 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, |
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502 strlen(v) + 1 + strlen(l) + 1 + |
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503 system_ext_size + 3, |
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504 mtInternal); |
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505 sprintf(ld_library_path, "%s%s%s%s%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS ":.", |
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506 v, v_colon, l, l_colon, user_home_dir); |
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507 Arguments::set_library_path(ld_library_path); |
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508 FREE_C_HEAP_ARRAY(char, ld_library_path, mtInternal); |
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509 } |
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510 |
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511 // Extensions directories. |
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512 // |
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513 // Note that the space for the colon and the trailing null are provided |
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514 // by the nulls included by the sizeof operator (so actually one byte more |
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515 // than necessary is allocated). |
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516 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, |
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517 user_home_dir, Arguments::get_java_home()); |
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518 Arguments::set_ext_dirs(buf); |
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519 |
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520 // Endorsed standards default directory. |
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521 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); |
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522 Arguments::set_endorsed_dirs(buf); |
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523 |
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524 FREE_C_HEAP_ARRAY(char, buf, mtInternal); |
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525 |
4006 | 526 #undef SYS_EXTENSIONS_DIR |
17848
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527 #undef SYS_EXTENSIONS_DIRS |
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528 |
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529 #endif // __APPLE__ |
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530 |
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531 #undef SYS_EXT_DIR |
3960 | 532 #undef EXTENSIONS_DIR |
533 #undef ENDORSED_DIR | |
534 } | |
535 | |
536 //////////////////////////////////////////////////////////////////////////////// | |
537 // breakpoint support | |
538 | |
539 void os::breakpoint() { | |
540 BREAKPOINT; | |
541 } | |
542 | |
543 extern "C" void breakpoint() { | |
544 // use debugger to set breakpoint here | |
545 } | |
546 | |
547 //////////////////////////////////////////////////////////////////////////////// | |
548 // signal support | |
549 | |
550 debug_only(static bool signal_sets_initialized = false); | |
551 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
552 | |
553 bool os::Bsd::is_sig_ignored(int sig) { | |
554 struct sigaction oact; | |
555 sigaction(sig, (struct sigaction*)NULL, &oact); | |
556 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
557 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
558 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
559 return true; | |
560 else | |
561 return false; | |
562 } | |
563 | |
564 void os::Bsd::signal_sets_init() { | |
565 // Should also have an assertion stating we are still single-threaded. | |
566 assert(!signal_sets_initialized, "Already initialized"); | |
567 // Fill in signals that are necessarily unblocked for all threads in | |
568 // the VM. Currently, we unblock the following signals: | |
569 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
570 // by -Xrs (=ReduceSignalUsage)); | |
571 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
572 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
573 // the dispositions or masks wrt these signals. | |
574 // Programs embedding the VM that want to use the above signals for their | |
575 // own purposes must, at this time, use the "-Xrs" option to prevent | |
576 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
577 // (See bug 4345157, and other related bugs). | |
578 // In reality, though, unblocking these signals is really a nop, since | |
579 // these signals are not blocked by default. | |
580 sigemptyset(&unblocked_sigs); | |
581 sigemptyset(&allowdebug_blocked_sigs); | |
582 sigaddset(&unblocked_sigs, SIGILL); | |
583 sigaddset(&unblocked_sigs, SIGSEGV); | |
584 sigaddset(&unblocked_sigs, SIGBUS); | |
585 sigaddset(&unblocked_sigs, SIGFPE); | |
586 sigaddset(&unblocked_sigs, SR_signum); | |
587 | |
588 if (!ReduceSignalUsage) { | |
589 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
590 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
591 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
592 } | |
593 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
594 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
595 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
596 } | |
597 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
598 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
599 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
600 } | |
601 } | |
602 // Fill in signals that are blocked by all but the VM thread. | |
603 sigemptyset(&vm_sigs); | |
604 if (!ReduceSignalUsage) | |
605 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
606 debug_only(signal_sets_initialized = true); | |
607 | |
608 } | |
609 | |
610 // These are signals that are unblocked while a thread is running Java. | |
611 // (For some reason, they get blocked by default.) | |
612 sigset_t* os::Bsd::unblocked_signals() { | |
613 assert(signal_sets_initialized, "Not initialized"); | |
614 return &unblocked_sigs; | |
615 } | |
616 | |
617 // These are the signals that are blocked while a (non-VM) thread is | |
618 // running Java. Only the VM thread handles these signals. | |
619 sigset_t* os::Bsd::vm_signals() { | |
620 assert(signal_sets_initialized, "Not initialized"); | |
621 return &vm_sigs; | |
622 } | |
623 | |
624 // These are signals that are blocked during cond_wait to allow debugger in | |
625 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
626 assert(signal_sets_initialized, "Not initialized"); | |
627 return &allowdebug_blocked_sigs; | |
628 } | |
629 | |
630 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
631 | |
632 //Save caller's signal mask before setting VM signal mask | |
633 sigset_t caller_sigmask; | |
634 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
635 | |
636 OSThread* osthread = thread->osthread(); | |
637 osthread->set_caller_sigmask(caller_sigmask); | |
638 | |
639 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
640 | |
641 if (!ReduceSignalUsage) { | |
642 if (thread->is_VM_thread()) { | |
643 // Only the VM thread handles BREAK_SIGNAL ... | |
644 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
645 } else { | |
646 // ... all other threads block BREAK_SIGNAL | |
647 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
648 } | |
649 } | |
650 } | |
651 | |
652 | |
653 ////////////////////////////////////////////////////////////////////////////// | |
654 // create new thread | |
655 | |
656 // check if it's safe to start a new thread | |
657 static bool _thread_safety_check(Thread* thread) { | |
6918 | 658 return true; |
3960 | 659 } |
660 | |
4006 | 661 #ifdef __APPLE__ |
662 // library handle for calling objc_registerThreadWithCollector() | |
663 // without static linking to the libobjc library | |
664 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
665 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
666 typedef void (*objc_registerThreadWithCollector_t)(); | |
667 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
668 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
669 #endif | |
670 | |
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671 #ifdef __APPLE__ |
12095 | 672 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { |
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673 // Additional thread_id used to correlate threads in SA |
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674 thread_identifier_info_data_t m_ident_info; |
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675 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
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676 |
12095 | 677 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, |
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678 (thread_info_t) &m_ident_info, &count); |
12095 | 679 |
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680 return m_ident_info.thread_id; |
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681 } |
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682 #endif |
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683 |
3960 | 684 // Thread start routine for all newly created threads |
685 static void *java_start(Thread *thread) { | |
686 // Try to randomize the cache line index of hot stack frames. | |
687 // This helps when threads of the same stack traces evict each other's | |
688 // cache lines. The threads can be either from the same JVM instance, or | |
689 // from different JVM instances. The benefit is especially true for | |
690 // processors with hyperthreading technology. | |
691 static int counter = 0; | |
692 int pid = os::current_process_id(); | |
693 alloca(((pid ^ counter++) & 7) * 128); | |
694 | |
695 ThreadLocalStorage::set_thread(thread); | |
696 | |
697 OSThread* osthread = thread->osthread(); | |
698 Monitor* sync = osthread->startThread_lock(); | |
699 | |
700 // non floating stack BsdThreads needs extra check, see above | |
701 if (!_thread_safety_check(thread)) { | |
702 // notify parent thread | |
703 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
704 osthread->set_state(ZOMBIE); | |
705 sync->notify_all(); | |
706 return NULL; | |
707 } | |
708 | |
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709 osthread->set_thread_id(os::Bsd::gettid()); |
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710 |
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711 #ifdef __APPLE__ |
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712 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
12095 | 713 guarantee(unique_thread_id != 0, "unique thread id was not found"); |
714 osthread->set_unique_thread_id(unique_thread_id); | |
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715 #endif |
3960 | 716 // initialize signal mask for this thread |
717 os::Bsd::hotspot_sigmask(thread); | |
718 | |
719 // initialize floating point control register | |
720 os::Bsd::init_thread_fpu_state(); | |
721 | |
4006 | 722 #ifdef __APPLE__ |
723 // register thread with objc gc | |
724 if (objc_registerThreadWithCollectorFunction != NULL) { | |
725 objc_registerThreadWithCollectorFunction(); | |
726 } | |
727 #endif | |
728 | |
3960 | 729 // handshaking with parent thread |
730 { | |
731 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
732 | |
733 // notify parent thread | |
734 osthread->set_state(INITIALIZED); | |
735 sync->notify_all(); | |
736 | |
737 // wait until os::start_thread() | |
738 while (osthread->get_state() == INITIALIZED) { | |
739 sync->wait(Mutex::_no_safepoint_check_flag); | |
740 } | |
741 } | |
742 | |
743 // call one more level start routine | |
744 thread->run(); | |
745 | |
746 return 0; | |
747 } | |
748 | |
749 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
750 assert(thread->osthread() == NULL, "caller responsible"); | |
751 | |
752 // Allocate the OSThread object | |
753 OSThread* osthread = new OSThread(NULL, NULL); | |
754 if (osthread == NULL) { | |
755 return false; | |
756 } | |
757 | |
758 // set the correct thread state | |
759 osthread->set_thread_type(thr_type); | |
760 | |
761 // Initial state is ALLOCATED but not INITIALIZED | |
762 osthread->set_state(ALLOCATED); | |
763 | |
764 thread->set_osthread(osthread); | |
765 | |
766 // init thread attributes | |
767 pthread_attr_t attr; | |
768 pthread_attr_init(&attr); | |
769 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
770 | |
771 // stack size | |
772 if (os::Bsd::supports_variable_stack_size()) { | |
773 // calculate stack size if it's not specified by caller | |
774 if (stack_size == 0) { | |
775 stack_size = os::Bsd::default_stack_size(thr_type); | |
776 | |
777 switch (thr_type) { | |
778 case os::java_thread: | |
779 // Java threads use ThreadStackSize which default value can be | |
780 // changed with the flag -Xss | |
781 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
782 stack_size = JavaThread::stack_size_at_create(); | |
783 break; | |
784 case os::compiler_thread: | |
785 if (CompilerThreadStackSize > 0) { | |
786 stack_size = (size_t)(CompilerThreadStackSize * K); | |
787 break; | |
788 } // else fall through: | |
789 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
790 case os::vm_thread: | |
791 case os::pgc_thread: | |
792 case os::cgc_thread: | |
793 case os::watcher_thread: | |
794 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
795 break; | |
796 } | |
797 } | |
798 | |
799 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
800 pthread_attr_setstacksize(&attr, stack_size); | |
801 } else { | |
802 // let pthread_create() pick the default value. | |
803 } | |
804 | |
805 ThreadState state; | |
806 | |
807 { | |
808 pthread_t tid; | |
809 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
810 | |
811 pthread_attr_destroy(&attr); | |
812 | |
813 if (ret != 0) { | |
814 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
815 perror("pthread_create()"); | |
816 } | |
817 // Need to clean up stuff we've allocated so far | |
818 thread->set_osthread(NULL); | |
819 delete osthread; | |
820 return false; | |
821 } | |
822 | |
823 // Store pthread info into the OSThread | |
824 osthread->set_pthread_id(tid); | |
825 | |
826 // Wait until child thread is either initialized or aborted | |
827 { | |
828 Monitor* sync_with_child = osthread->startThread_lock(); | |
829 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
830 while ((state = osthread->get_state()) == ALLOCATED) { | |
831 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
832 } | |
833 } | |
834 | |
835 } | |
836 | |
837 // Aborted due to thread limit being reached | |
838 if (state == ZOMBIE) { | |
839 thread->set_osthread(NULL); | |
840 delete osthread; | |
841 return false; | |
842 } | |
843 | |
844 // The thread is returned suspended (in state INITIALIZED), | |
845 // and is started higher up in the call chain | |
846 assert(state == INITIALIZED, "race condition"); | |
847 return true; | |
848 } | |
849 | |
850 ///////////////////////////////////////////////////////////////////////////// | |
851 // attach existing thread | |
852 | |
853 // bootstrap the main thread | |
854 bool os::create_main_thread(JavaThread* thread) { | |
855 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
856 return create_attached_thread(thread); | |
857 } | |
858 | |
859 bool os::create_attached_thread(JavaThread* thread) { | |
860 #ifdef ASSERT | |
861 thread->verify_not_published(); | |
862 #endif | |
863 | |
864 // Allocate the OSThread object | |
865 OSThread* osthread = new OSThread(NULL, NULL); | |
866 | |
867 if (osthread == NULL) { | |
868 return false; | |
869 } | |
870 | |
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871 osthread->set_thread_id(os::Bsd::gettid()); |
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872 |
3960 | 873 // Store pthread info into the OSThread |
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874 #ifdef __APPLE__ |
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875 uint64_t unique_thread_id = locate_unique_thread_id(osthread->thread_id()); |
12095 | 876 guarantee(unique_thread_id != 0, "just checking"); |
877 osthread->set_unique_thread_id(unique_thread_id); | |
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878 #endif |
3960 | 879 osthread->set_pthread_id(::pthread_self()); |
880 | |
881 // initialize floating point control register | |
882 os::Bsd::init_thread_fpu_state(); | |
883 | |
884 // Initial thread state is RUNNABLE | |
885 osthread->set_state(RUNNABLE); | |
886 | |
887 thread->set_osthread(osthread); | |
888 | |
889 // initialize signal mask for this thread | |
890 // and save the caller's signal mask | |
891 os::Bsd::hotspot_sigmask(thread); | |
892 | |
893 return true; | |
894 } | |
895 | |
896 void os::pd_start_thread(Thread* thread) { | |
897 OSThread * osthread = thread->osthread(); | |
898 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
899 Monitor* sync_with_child = osthread->startThread_lock(); | |
900 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
901 sync_with_child->notify(); | |
902 } | |
903 | |
904 // Free Bsd resources related to the OSThread | |
905 void os::free_thread(OSThread* osthread) { | |
906 assert(osthread != NULL, "osthread not set"); | |
907 | |
908 if (Thread::current()->osthread() == osthread) { | |
909 // Restore caller's signal mask | |
910 sigset_t sigmask = osthread->caller_sigmask(); | |
911 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
912 } | |
913 | |
914 delete osthread; | |
915 } | |
916 | |
917 ////////////////////////////////////////////////////////////////////////////// | |
918 // thread local storage | |
919 | |
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920 // Restore the thread pointer if the destructor is called. This is in case |
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921 // someone from JNI code sets up a destructor with pthread_key_create to run |
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922 // detachCurrentThread on thread death. Unless we restore the thread pointer we |
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923 // will hang or crash. When detachCurrentThread is called the key will be set |
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924 // to null and we will not be called again. If detachCurrentThread is never |
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925 // called we could loop forever depending on the pthread implementation. |
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926 static void restore_thread_pointer(void* p) { |
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927 Thread* thread = (Thread*) p; |
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928 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); |
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929 } |
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930 |
3960 | 931 int os::allocate_thread_local_storage() { |
932 pthread_key_t key; | |
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933 int rslt = pthread_key_create(&key, restore_thread_pointer); |
3960 | 934 assert(rslt == 0, "cannot allocate thread local storage"); |
935 return (int)key; | |
936 } | |
937 | |
938 // Note: This is currently not used by VM, as we don't destroy TLS key | |
939 // on VM exit. | |
940 void os::free_thread_local_storage(int index) { | |
941 int rslt = pthread_key_delete((pthread_key_t)index); | |
942 assert(rslt == 0, "invalid index"); | |
943 } | |
944 | |
945 void os::thread_local_storage_at_put(int index, void* value) { | |
946 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
947 assert(rslt == 0, "pthread_setspecific failed"); | |
948 } | |
949 | |
950 extern "C" Thread* get_thread() { | |
951 return ThreadLocalStorage::thread(); | |
952 } | |
953 | |
954 | |
955 //////////////////////////////////////////////////////////////////////////////// | |
956 // time support | |
957 | |
958 // Time since start-up in seconds to a fine granularity. | |
959 // Used by VMSelfDestructTimer and the MemProfiler. | |
960 double os::elapsedTime() { | |
961 | |
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962 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); |
3960 | 963 } |
964 | |
965 jlong os::elapsed_counter() { | |
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966 return javaTimeNanos() - initial_time_count; |
3960 | 967 } |
968 | |
969 jlong os::elapsed_frequency() { | |
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970 return NANOSECS_PER_SEC; // nanosecond resolution |
3960 | 971 } |
972 | |
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973 bool os::supports_vtime() { return true; } |
3960 | 974 bool os::enable_vtime() { return false; } |
975 bool os::vtime_enabled() { return false; } | |
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976 |
3960 | 977 double os::elapsedVTime() { |
978 // better than nothing, but not much | |
979 return elapsedTime(); | |
980 } | |
981 | |
982 jlong os::javaTimeMillis() { | |
983 timeval time; | |
984 int status = gettimeofday(&time, NULL); | |
985 assert(status != -1, "bsd error"); | |
986 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
987 } | |
988 | |
989 #ifndef CLOCK_MONOTONIC | |
990 #define CLOCK_MONOTONIC (1) | |
991 #endif | |
992 | |
993 #ifdef __APPLE__ | |
994 void os::Bsd::clock_init() { | |
995 // XXXDARWIN: Investigate replacement monotonic clock | |
996 } | |
6918 | 997 #else |
3960 | 998 void os::Bsd::clock_init() { |
999 struct timespec res; | |
1000 struct timespec tp; | |
1001 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
1002 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
1003 // yes, monotonic clock is supported | |
1004 _clock_gettime = ::clock_gettime; | |
1005 } | |
1006 } | |
1007 #endif | |
1008 | |
1009 | |
1010 jlong os::javaTimeNanos() { | |
1011 if (Bsd::supports_monotonic_clock()) { | |
1012 struct timespec tp; | |
1013 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
1014 assert(status == 0, "gettime error"); | |
1015 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
1016 return result; | |
1017 } else { | |
1018 timeval time; | |
1019 int status = gettimeofday(&time, NULL); | |
1020 assert(status != -1, "bsd error"); | |
1021 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
1022 return 1000 * usecs; | |
1023 } | |
1024 } | |
1025 | |
1026 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
1027 if (Bsd::supports_monotonic_clock()) { | |
1028 info_ptr->max_value = ALL_64_BITS; | |
1029 | |
1030 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
1031 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
1032 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
1033 } else { | |
1034 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
1035 info_ptr->max_value = ALL_64_BITS; | |
1036 | |
1037 // gettimeofday is a real time clock so it skips | |
1038 info_ptr->may_skip_backward = true; | |
1039 info_ptr->may_skip_forward = true; | |
1040 } | |
1041 | |
1042 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
1043 } | |
1044 | |
1045 // Return the real, user, and system times in seconds from an | |
1046 // arbitrary fixed point in the past. | |
1047 bool os::getTimesSecs(double* process_real_time, | |
1048 double* process_user_time, | |
1049 double* process_system_time) { | |
1050 struct tms ticks; | |
1051 clock_t real_ticks = times(&ticks); | |
1052 | |
1053 if (real_ticks == (clock_t) (-1)) { | |
1054 return false; | |
1055 } else { | |
1056 double ticks_per_second = (double) clock_tics_per_sec; | |
1057 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
1058 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
1059 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
1060 | |
1061 return true; | |
1062 } | |
1063 } | |
1064 | |
1065 | |
1066 char * os::local_time_string(char *buf, size_t buflen) { | |
1067 struct tm t; | |
1068 time_t long_time; | |
1069 time(&long_time); | |
1070 localtime_r(&long_time, &t); | |
1071 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
1072 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
1073 t.tm_hour, t.tm_min, t.tm_sec); | |
1074 return buf; | |
1075 } | |
1076 | |
1077 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
1078 return localtime_r(clock, res); | |
1079 } | |
1080 | |
1081 //////////////////////////////////////////////////////////////////////////////// | |
1082 // runtime exit support | |
1083 | |
1084 // Note: os::shutdown() might be called very early during initialization, or | |
1085 // called from signal handler. Before adding something to os::shutdown(), make | |
1086 // sure it is async-safe and can handle partially initialized VM. | |
1087 void os::shutdown() { | |
1088 | |
1089 // allow PerfMemory to attempt cleanup of any persistent resources | |
1090 perfMemory_exit(); | |
1091 | |
1092 // needs to remove object in file system | |
1093 AttachListener::abort(); | |
1094 | |
1095 // flush buffered output, finish log files | |
1096 ostream_abort(); | |
1097 | |
1098 // Check for abort hook | |
1099 abort_hook_t abort_hook = Arguments::abort_hook(); | |
1100 if (abort_hook != NULL) { | |
1101 abort_hook(); | |
1102 } | |
1103 | |
1104 } | |
1105 | |
1106 // Note: os::abort() might be called very early during initialization, or | |
1107 // called from signal handler. Before adding something to os::abort(), make | |
1108 // sure it is async-safe and can handle partially initialized VM. | |
1109 void os::abort(bool dump_core) { | |
1110 os::shutdown(); | |
1111 if (dump_core) { | |
1112 #ifndef PRODUCT | |
1113 fdStream out(defaultStream::output_fd()); | |
1114 out.print_raw("Current thread is "); | |
1115 char buf[16]; | |
1116 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
1117 out.print_raw_cr(buf); | |
1118 out.print_raw_cr("Dumping core ..."); | |
1119 #endif | |
1120 ::abort(); // dump core | |
1121 } | |
1122 | |
1123 ::exit(1); | |
1124 } | |
1125 | |
1126 // Die immediately, no exit hook, no abort hook, no cleanup. | |
1127 void os::die() { | |
1128 // _exit() on BsdThreads only kills current thread | |
1129 ::abort(); | |
1130 } | |
1131 | |
1132 // unused on bsd for now. | |
1133 void os::set_error_file(const char *logfile) {} | |
1134 | |
1135 | |
1136 // This method is a copy of JDK's sysGetLastErrorString | |
1137 // from src/solaris/hpi/src/system_md.c | |
1138 | |
1139 size_t os::lasterror(char *buf, size_t len) { | |
1140 | |
1141 if (errno == 0) return 0; | |
1142 | |
1143 const char *s = ::strerror(errno); | |
1144 size_t n = ::strlen(s); | |
1145 if (n >= len) { | |
1146 n = len - 1; | |
1147 } | |
1148 ::strncpy(buf, s, n); | |
1149 buf[n] = '\0'; | |
1150 return n; | |
1151 } | |
1152 | |
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1153 // Information of current thread in variety of formats |
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1154 pid_t os::Bsd::gettid() { |
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1155 int retval = -1; |
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1156 |
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1157 #ifdef __APPLE__ //XNU kernel |
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1158 // despite the fact mach port is actually not a thread id use it |
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1159 // instead of syscall(SYS_thread_selfid) as it certainly fits to u4 |
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1160 retval = ::pthread_mach_thread_np(::pthread_self()); |
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1161 guarantee(retval != 0, "just checking"); |
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1162 return retval; |
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1163 |
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1164 #elif __FreeBSD__ |
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1165 retval = syscall(SYS_thr_self); |
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1166 #elif __OpenBSD__ |
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1167 retval = syscall(SYS_getthrid); |
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1168 #elif __NetBSD__ |
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1169 retval = (pid_t) syscall(SYS__lwp_self); |
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1170 #endif |
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1171 |
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1172 if (retval == -1) { |
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1173 return getpid(); |
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1174 } |
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1175 } |
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1176 |
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1177 intx os::current_thread_id() { |
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1178 #ifdef __APPLE__ |
12095 | 1179 return (intx)::pthread_mach_thread_np(::pthread_self()); |
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1180 #else |
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1181 return (intx)::pthread_self(); |
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1182 #endif |
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1183 } |
12809
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1184 |
3960 | 1185 int os::current_process_id() { |
1186 | |
1187 // Under the old bsd thread library, bsd gives each thread | |
1188 // its own process id. Because of this each thread will return | |
1189 // a different pid if this method were to return the result | |
1190 // of getpid(2). Bsd provides no api that returns the pid | |
1191 // of the launcher thread for the vm. This implementation | |
1192 // returns a unique pid, the pid of the launcher thread | |
1193 // that starts the vm 'process'. | |
1194 | |
1195 // Under the NPTL, getpid() returns the same pid as the | |
1196 // launcher thread rather than a unique pid per thread. | |
1197 // Use gettid() if you want the old pre NPTL behaviour. | |
1198 | |
1199 // if you are looking for the result of a call to getpid() that | |
1200 // returns a unique pid for the calling thread, then look at the | |
1201 // OSThread::thread_id() method in osThread_bsd.hpp file | |
1202 | |
1203 return (int)(_initial_pid ? _initial_pid : getpid()); | |
1204 } | |
1205 | |
1206 // DLL functions | |
1207 | |
1208 #define JNI_LIB_PREFIX "lib" | |
1209 #ifdef __APPLE__ | |
1210 #define JNI_LIB_SUFFIX ".dylib" | |
1211 #else | |
1212 #define JNI_LIB_SUFFIX ".so" | |
1213 #endif | |
1214 | |
1215 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
1216 | |
1217 // This must be hard coded because it's the system's temporary | |
1218 // directory not the java application's temp directory, ala java.io.tmpdir. | |
4006 | 1219 #ifdef __APPLE__ |
1220 // macosx has a secure per-user temporary directory | |
1221 char temp_path_storage[PATH_MAX]; | |
1222 const char* os::get_temp_directory() { | |
1223 static char *temp_path = NULL; | |
1224 if (temp_path == NULL) { | |
1225 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
1226 if (pathSize == 0 || pathSize > PATH_MAX) { | |
1227 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
1228 } | |
1229 temp_path = temp_path_storage; | |
1230 } | |
1231 return temp_path; | |
1232 } | |
1233 #else /* __APPLE__ */ | |
3960 | 1234 const char* os::get_temp_directory() { return "/tmp"; } |
4006 | 1235 #endif /* __APPLE__ */ |
3960 | 1236 |
1237 static bool file_exists(const char* filename) { | |
1238 struct stat statbuf; | |
1239 if (filename == NULL || strlen(filename) == 0) { | |
1240 return false; | |
1241 } | |
1242 return os::stat(filename, &statbuf) == 0; | |
1243 } | |
1244 | |
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1245 bool os::dll_build_name(char* buffer, size_t buflen, |
3960 | 1246 const char* pname, const char* fname) { |
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1247 bool retval = false; |
3960 | 1248 // Copied from libhpi |
1249 const size_t pnamelen = pname ? strlen(pname) : 0; | |
1250 | |
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1251 // Return error on buffer overflow. |
3960 | 1252 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1253 return retval; |
3960 | 1254 } |
1255 | |
1256 if (pnamelen == 0) { | |
1257 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1258 retval = true; |
3960 | 1259 } else if (strchr(pname, *os::path_separator()) != NULL) { |
1260 int n; | |
1261 char** pelements = split_path(pname, &n); | |
9059
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1262 if (pelements == NULL) { |
9062 | 1263 return false; |
9059
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|
1264 } |
3960 | 1265 for (int i = 0 ; i < n ; i++) { |
1266 // Really shouldn't be NULL, but check can't hurt | |
1267 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
1268 continue; // skip the empty path values | |
1269 } | |
1270 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
1271 pelements[i], fname); | |
1272 if (file_exists(buffer)) { | |
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1273 retval = true; |
3960 | 1274 break; |
1275 } | |
1276 } | |
1277 // release the storage | |
1278 for (int i = 0 ; i < n ; i++) { | |
1279 if (pelements[i] != NULL) { | |
6197 | 1280 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
3960 | 1281 } |
1282 } | |
1283 if (pelements != NULL) { | |
6197 | 1284 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
3960 | 1285 } |
1286 } else { | |
1287 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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1288 retval = true; |
3960 | 1289 } |
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1290 return retval; |
3960 | 1291 } |
1292 | |
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1293 // check if addr is inside libjvm.so |
3960 | 1294 bool os::address_is_in_vm(address addr) { |
1295 static address libjvm_base_addr; | |
1296 Dl_info dlinfo; | |
1297 | |
1298 if (libjvm_base_addr == NULL) { | |
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1299 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
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1300 libjvm_base_addr = (address)dlinfo.dli_fbase; |
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1301 } |
3960 | 1302 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
1303 } | |
1304 | |
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1305 if (dladdr((void *)addr, &dlinfo) != 0) { |
3960 | 1306 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
1307 } | |
1308 | |
1309 return false; | |
1310 } | |
1311 | |
6258 | 1312 |
1313 #define MACH_MAXSYMLEN 256 | |
1314 | |
3960 | 1315 bool os::dll_address_to_function_name(address addr, char *buf, |
1316 int buflen, int *offset) { | |
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1317 // buf is not optional, but offset is optional |
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1318 assert(buf != NULL, "sanity check"); |
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1319 |
3960 | 1320 Dl_info dlinfo; |
6258 | 1321 char localbuf[MACH_MAXSYMLEN]; |
1322 | |
11092
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1323 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1324 // see if we have a matching symbol |
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1325 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
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1326 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
3960 | 1327 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
1328 } | |
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1329 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
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1330 return true; |
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1331 } |
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1332 // no matching symbol so try for just file info |
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1333 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
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1334 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
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1335 buf, buflen, offset, dlinfo.dli_fname)) { |
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1336 return true; |
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|
1337 } |
3960 | 1338 } |
11092
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1339 |
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1340 // Handle non-dynamic manually: |
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1341 if (dlinfo.dli_fbase != NULL && |
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1342 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, |
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1343 dlinfo.dli_fbase)) { |
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1344 if (!Decoder::demangle(localbuf, buf, buflen)) { |
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1345 jio_snprintf(buf, buflen, "%s", localbuf); |
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1346 } |
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1347 return true; |
3960 | 1348 } |
1349 } | |
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1350 buf[0] = '\0'; |
3960 | 1351 if (offset != NULL) *offset = -1; |
1352 return false; | |
1353 } | |
1354 | |
1355 // ported from solaris version | |
1356 bool os::dll_address_to_library_name(address addr, char* buf, | |
1357 int buflen, int* offset) { | |
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1358 // buf is not optional, but offset is optional |
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1359 assert(buf != NULL, "sanity check"); |
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1360 |
3960 | 1361 Dl_info dlinfo; |
1362 | |
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1363 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1364 if (dlinfo.dli_fname != NULL) { |
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1365 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
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1366 } |
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1367 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
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1368 *offset = addr - (address)dlinfo.dli_fbase; |
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1369 } |
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1370 return true; |
3960 | 1371 } |
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1372 |
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1373 buf[0] = '\0'; |
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1374 if (offset) *offset = -1; |
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1375 return false; |
3960 | 1376 } |
6918 | 1377 |
1378 // Loads .dll/.so and | |
1379 // in case of error it checks if .dll/.so was built for the | |
1380 // same architecture as Hotspot is running on | |
3960 | 1381 |
1382 #ifdef __APPLE__ | |
1383 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
1384 void * result= ::dlopen(filename, RTLD_LAZY); | |
1385 if (result != NULL) { | |
1386 // Successful loading | |
1387 return result; | |
1388 } | |
1389 | |
1390 // Read system error message into ebuf | |
1391 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1392 ebuf[ebuflen-1]='\0'; | |
1393 | |
1394 return NULL; | |
1395 } | |
1396 #else | |
1397 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
1398 { | |
1399 void * result= ::dlopen(filename, RTLD_LAZY); | |
1400 if (result != NULL) { | |
1401 // Successful loading | |
1402 return result; | |
1403 } | |
1404 | |
1405 Elf32_Ehdr elf_head; | |
1406 | |
1407 // Read system error message into ebuf | |
1408 // It may or may not be overwritten below | |
1409 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
1410 ebuf[ebuflen-1]='\0'; | |
1411 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
1412 char* diag_msg_buf=ebuf+strlen(ebuf); | |
1413 | |
1414 if (diag_msg_max_length==0) { | |
1415 // No more space in ebuf for additional diagnostics message | |
1416 return NULL; | |
1417 } | |
1418 | |
1419 | |
1420 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
1421 | |
1422 if (file_descriptor < 0) { | |
1423 // Can't open library, report dlerror() message | |
1424 return NULL; | |
1425 } | |
1426 | |
1427 bool failed_to_read_elf_head= | |
1428 (sizeof(elf_head)!= | |
1429 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
1430 | |
1431 ::close(file_descriptor); | |
1432 if (failed_to_read_elf_head) { | |
1433 // file i/o error - report dlerror() msg | |
1434 return NULL; | |
1435 } | |
1436 | |
1437 typedef struct { | |
1438 Elf32_Half code; // Actual value as defined in elf.h | |
1439 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
1440 char elf_class; // 32 or 64 bit | |
1441 char endianess; // MSB or LSB | |
1442 char* name; // String representation | |
1443 } arch_t; | |
1444 | |
1445 #ifndef EM_486 | |
1446 #define EM_486 6 /* Intel 80486 */ | |
1447 #endif | |
1448 | |
1449 #ifndef EM_MIPS_RS3_LE | |
1450 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
1451 #endif | |
1452 | |
1453 #ifndef EM_PPC64 | |
1454 #define EM_PPC64 21 /* PowerPC64 */ | |
1455 #endif | |
1456 | |
1457 #ifndef EM_S390 | |
1458 #define EM_S390 22 /* IBM System/390 */ | |
1459 #endif | |
1460 | |
1461 #ifndef EM_IA_64 | |
1462 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
1463 #endif | |
1464 | |
1465 #ifndef EM_X86_64 | |
1466 #define EM_X86_64 62 /* AMD x86-64 */ | |
1467 #endif | |
1468 | |
1469 static const arch_t arch_array[]={ | |
1470 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1471 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
1472 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
1473 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
1474 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1475 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
1476 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
1477 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
1478 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
1479 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
1480 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
1481 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
1482 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
1483 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
1484 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
1485 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
1486 }; | |
1487 | |
1488 #if (defined IA32) | |
1489 static Elf32_Half running_arch_code=EM_386; | |
1490 #elif (defined AMD64) | |
1491 static Elf32_Half running_arch_code=EM_X86_64; | |
1492 #elif (defined IA64) | |
1493 static Elf32_Half running_arch_code=EM_IA_64; | |
1494 #elif (defined __sparc) && (defined _LP64) | |
1495 static Elf32_Half running_arch_code=EM_SPARCV9; | |
1496 #elif (defined __sparc) && (!defined _LP64) | |
1497 static Elf32_Half running_arch_code=EM_SPARC; | |
1498 #elif (defined __powerpc64__) | |
1499 static Elf32_Half running_arch_code=EM_PPC64; | |
1500 #elif (defined __powerpc__) | |
1501 static Elf32_Half running_arch_code=EM_PPC; | |
1502 #elif (defined ARM) | |
1503 static Elf32_Half running_arch_code=EM_ARM; | |
1504 #elif (defined S390) | |
1505 static Elf32_Half running_arch_code=EM_S390; | |
1506 #elif (defined ALPHA) | |
1507 static Elf32_Half running_arch_code=EM_ALPHA; | |
1508 #elif (defined MIPSEL) | |
1509 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
1510 #elif (defined PARISC) | |
1511 static Elf32_Half running_arch_code=EM_PARISC; | |
1512 #elif (defined MIPS) | |
1513 static Elf32_Half running_arch_code=EM_MIPS; | |
1514 #elif (defined M68K) | |
1515 static Elf32_Half running_arch_code=EM_68K; | |
1516 #else | |
1517 #error Method os::dll_load requires that one of following is defined:\ | |
1518 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
1519 #endif | |
1520 | |
1521 // Identify compatability class for VM's architecture and library's architecture | |
1522 // Obtain string descriptions for architectures | |
1523 | |
1524 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
1525 int running_arch_index=-1; | |
1526 | |
1527 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
1528 if (running_arch_code == arch_array[i].code) { | |
1529 running_arch_index = i; | |
1530 } | |
1531 if (lib_arch.code == arch_array[i].code) { | |
1532 lib_arch.compat_class = arch_array[i].compat_class; | |
1533 lib_arch.name = arch_array[i].name; | |
1534 } | |
1535 } | |
1536 | |
1537 assert(running_arch_index != -1, | |
1538 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
1539 if (running_arch_index == -1) { | |
1540 // Even though running architecture detection failed | |
1541 // we may still continue with reporting dlerror() message | |
1542 return NULL; | |
1543 } | |
1544 | |
1545 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
1546 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
1547 return NULL; | |
1548 } | |
1549 | |
1550 #ifndef S390 | |
1551 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
1552 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
1553 return NULL; | |
1554 } | |
1555 #endif // !S390 | |
1556 | |
1557 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
1558 if ( lib_arch.name!=NULL ) { | |
1559 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1560 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
1561 lib_arch.name, arch_array[running_arch_index].name); | |
1562 } else { | |
1563 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
1564 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
1565 lib_arch.code, | |
1566 arch_array[running_arch_index].name); | |
1567 } | |
1568 } | |
1569 | |
1570 return NULL; | |
1571 } | |
1572 #endif /* !__APPLE__ */ | |
1573 | |
17684
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|
1574 void* os::get_default_process_handle() { |
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8031968: Mac OS X: VM starts the agent by calling both Agent_OnAttach and Agent_OnAttach_L functions if its agent library is dynamically linked.
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|
1575 #ifdef __APPLE__ |
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8031968: Mac OS X: VM starts the agent by calling both Agent_OnAttach and Agent_OnAttach_L functions if its agent library is dynamically linked.
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|
1576 // MacOS X needs to use RTLD_FIRST instead of RTLD_LAZY |
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|
1577 // to avoid finding unexpected symbols on second (or later) |
d1621038becf
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|
1578 // loads of a library. |
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|
1579 return (void*)::dlopen(NULL, RTLD_FIRST); |
d1621038becf
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|
1580 #else |
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|
1581 return (void*)::dlopen(NULL, RTLD_LAZY); |
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|
1582 #endif |
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|
1583 } |
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|
1584 |
3960 | 1585 // XXX: Do we need a lock around this as per Linux? |
1586 void* os::dll_lookup(void* handle, const char* name) { | |
1587 return dlsym(handle, name); | |
1588 } | |
1589 | |
1590 | |
1591 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
1592 int fd = ::open(filename, O_RDONLY); | |
1593 if (fd == -1) { | |
1594 return false; | |
1595 } | |
1596 | |
1597 char buf[32]; | |
1598 int bytes; | |
1599 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
1600 st->print_raw(buf, bytes); | |
1601 } | |
1602 | |
1603 ::close(fd); | |
1604 | |
1605 return true; | |
1606 } | |
1607 | |
1608 void os::print_dll_info(outputStream *st) { | |
11092
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|
1609 st->print_cr("Dynamic libraries:"); |
3960 | 1610 #ifdef RTLD_DI_LINKMAP |
11092
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|
1611 Dl_info dli; |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1612 void *handle; |
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|
1613 Link_map *map; |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1614 Link_map *p; |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1615 |
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|
1616 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || |
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|
1617 dli.dli_fname == NULL) { |
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|
1618 st->print_cr("Error: Cannot print dynamic libraries."); |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1619 return; |
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|
1620 } |
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|
1621 handle = dlopen(dli.dli_fname, RTLD_LAZY); |
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|
1622 if (handle == NULL) { |
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|
1623 st->print_cr("Error: Cannot print dynamic libraries."); |
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|
1624 return; |
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|
1625 } |
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|
1626 dlinfo(handle, RTLD_DI_LINKMAP, &map); |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1627 if (map == NULL) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
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|
1628 st->print_cr("Error: Cannot print dynamic libraries."); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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parents:
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changeset
|
1629 return; |
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parents:
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diff
changeset
|
1630 } |
59b052799158
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parents:
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|
1631 |
59b052799158
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dcubed
parents:
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|
1632 while (map->l_prev != NULL) |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
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|
1633 map = map->l_prev; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1634 |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1635 while (map != NULL) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
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|
1636 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); |
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8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1637 map = map->l_next; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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parents:
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diff
changeset
|
1638 } |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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parents:
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diff
changeset
|
1639 |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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parents:
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diff
changeset
|
1640 dlclose(handle); |
3960 | 1641 #elif defined(__APPLE__) |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
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|
1642 uint32_t count; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
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changeset
|
1643 uint32_t i; |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
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diff
changeset
|
1644 |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
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diff
changeset
|
1645 count = _dyld_image_count(); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
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diff
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|
1646 for (i = 1; i < count; i++) { |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
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|
1647 const char *name = _dyld_get_image_name(i); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
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|
1648 intptr_t slide = _dyld_get_image_vmaddr_slide(i); |
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
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|
1649 st->print_cr(PTR_FORMAT " \t%s", slide, name); |
59b052799158
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parents:
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diff
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|
1650 } |
3960 | 1651 #else |
11092
59b052799158
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dcubed
parents:
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|
1652 st->print_cr("Error: Cannot print dynamic libraries."); |
3960 | 1653 #endif |
1654 } | |
1655 | |
6080
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
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5921
diff
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|
1656 void os::print_os_info_brief(outputStream* st) { |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
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5921
diff
changeset
|
1657 st->print("Bsd"); |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5921
diff
changeset
|
1658 |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5921
diff
changeset
|
1659 os::Posix::print_uname_info(st); |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5921
diff
changeset
|
1660 } |
3960 | 1661 |
1662 void os::print_os_info(outputStream* st) { | |
1663 st->print("OS:"); | |
6080
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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parents:
5921
diff
changeset
|
1664 st->print("Bsd"); |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5921
diff
changeset
|
1665 |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5921
diff
changeset
|
1666 os::Posix::print_uname_info(st); |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5921
diff
changeset
|
1667 |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5921
diff
changeset
|
1668 os::Posix::print_rlimit_info(st); |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
nloodin
parents:
5921
diff
changeset
|
1669 |
7432b9db36ff
7165755: OS Information much longer on linux than other platforms
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5921
diff
changeset
|
1670 os::Posix::print_load_average(st); |
3960 | 1671 } |
1672 | |
1673 void os::pd_print_cpu_info(outputStream* st) { | |
1674 // Nothing to do for now. | |
1675 } | |
1676 | |
1677 void os::print_memory_info(outputStream* st) { | |
1678 | |
1679 st->print("Memory:"); | |
1680 st->print(" %dk page", os::vm_page_size()>>10); | |
1681 | |
1682 st->print(", physical " UINT64_FORMAT "k", | |
1683 os::physical_memory() >> 10); | |
1684 st->print("(" UINT64_FORMAT "k free)", | |
1685 os::available_memory() >> 10); | |
1686 st->cr(); | |
1687 | |
1688 // meminfo | |
1689 st->print("\n/proc/meminfo:\n"); | |
1690 _print_ascii_file("/proc/meminfo", st); | |
1691 st->cr(); | |
1692 } | |
1693 | |
1694 void os::print_siginfo(outputStream* st, void* siginfo) { | |
14410 | 1695 const siginfo_t* si = (const siginfo_t*)siginfo; |
1696 | |
1697 os::Posix::print_siginfo_brief(st, si); | |
1698 | |
1699 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
3960 | 1700 UseSharedSpaces) { |
1701 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
1702 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
1703 st->print("\n\nError accessing class data sharing archive." \ | |
1704 " Mapped file inaccessible during execution, " \ | |
1705 " possible disk/network problem."); | |
1706 } | |
1707 } | |
1708 st->cr(); | |
1709 } | |
1710 | |
1711 | |
1712 static void print_signal_handler(outputStream* st, int sig, | |
1713 char* buf, size_t buflen); | |
1714 | |
1715 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
1716 st->print_cr("Signal Handlers:"); | |
1717 print_signal_handler(st, SIGSEGV, buf, buflen); | |
1718 print_signal_handler(st, SIGBUS , buf, buflen); | |
1719 print_signal_handler(st, SIGFPE , buf, buflen); | |
1720 print_signal_handler(st, SIGPIPE, buf, buflen); | |
1721 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
1722 print_signal_handler(st, SIGILL , buf, buflen); | |
1723 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
1724 print_signal_handler(st, SR_signum, buf, buflen); | |
1725 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
1726 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
1727 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
1728 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
1729 } | |
1730 | |
1731 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
1732 | |
7456
7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
dcubed
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7206
diff
changeset
|
1733 // Find the full path to the current module, libjvm |
3960 | 1734 void os::jvm_path(char *buf, jint buflen) { |
1735 // Error checking. | |
1736 if (buflen < MAXPATHLEN) { | |
1737 assert(false, "must use a large-enough buffer"); | |
1738 buf[0] = '\0'; | |
1739 return; | |
1740 } | |
1741 // Lazy resolve the path to current module. | |
1742 if (saved_jvm_path[0] != 0) { | |
1743 strcpy(buf, saved_jvm_path); | |
1744 return; | |
1745 } | |
1746 | |
1747 char dli_fname[MAXPATHLEN]; | |
1748 bool ret = dll_address_to_library_name( | |
1749 CAST_FROM_FN_PTR(address, os::jvm_path), | |
1750 dli_fname, sizeof(dli_fname), NULL); | |
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|
1751 assert(ret, "cannot locate libjvm"); |
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|
1752 char *rp = NULL; |
59b052799158
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dcubed
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|
1753 if (ret && dli_fname[0] != '\0') { |
59b052799158
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|
1754 rp = realpath(dli_fname, buf); |
59b052799158
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|
1755 } |
3960 | 1756 if (rp == NULL) |
1757 return; | |
1758 | |
1759 if (Arguments::created_by_gamma_launcher()) { | |
1760 // Support for the gamma launcher. Typical value for buf is | |
4846 | 1761 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
3960 | 1762 // the right place in the string, then assume we are installed in a JDK and |
4846 | 1763 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
1764 // construct a path to the JVM being overridden. | |
1765 | |
3960 | 1766 const char *p = buf + strlen(buf) - 1; |
1767 for (int count = 0; p > buf && count < 5; ++count) { | |
1768 for (--p; p > buf && *p != '/'; --p) | |
1769 /* empty */ ; | |
1770 } | |
1771 | |
1772 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
1773 // Look for JAVA_HOME in the environment. | |
1774 char* java_home_var = ::getenv("JAVA_HOME"); | |
1775 if (java_home_var != NULL && java_home_var[0] != 0) { | |
1776 char* jrelib_p; | |
1777 int len; | |
1778 | |
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1779 // Check the current module name "libjvm" |
3960 | 1780 p = strrchr(buf, '/'); |
1781 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
1782 | |
1783 rp = realpath(java_home_var, buf); | |
1784 if (rp == NULL) | |
1785 return; | |
1786 | |
1787 // determine if this is a legacy image or modules image | |
1788 // modules image doesn't have "jre" subdirectory | |
1789 len = strlen(buf); | |
1790 jrelib_p = buf + len; | |
4846 | 1791 |
1792 // Add the appropriate library subdir | |
1793 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
3960 | 1794 if (0 != access(buf, F_OK)) { |
4846 | 1795 snprintf(jrelib_p, buflen-len, "/lib"); |
3960 | 1796 } |
1797 | |
4846 | 1798 // Add the appropriate client or server subdir |
1799 len = strlen(buf); | |
1800 jrelib_p = buf + len; | |
1801 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
1802 if (0 != access(buf, F_OK)) { | |
1803 snprintf(jrelib_p, buflen-len, ""); | |
1804 } | |
1805 | |
1806 // If the path exists within JAVA_HOME, add the JVM library name | |
1807 // to complete the path to JVM being overridden. Otherwise fallback | |
1808 // to the path to the current library. | |
3960 | 1809 if (0 == access(buf, F_OK)) { |
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1810 // Use current module name "libjvm" |
3960 | 1811 len = strlen(buf); |
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1812 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
3960 | 1813 } else { |
4846 | 1814 // Fall back to path of current library |
3960 | 1815 rp = realpath(dli_fname, buf); |
1816 if (rp == NULL) | |
1817 return; | |
1818 } | |
1819 } | |
1820 } | |
1821 } | |
1822 | |
1823 strcpy(saved_jvm_path, buf); | |
1824 } | |
1825 | |
1826 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
1827 // no prefix required, not even "_" | |
1828 } | |
1829 | |
1830 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
1831 // no suffix required | |
1832 } | |
1833 | |
1834 //////////////////////////////////////////////////////////////////////////////// | |
1835 // sun.misc.Signal support | |
1836 | |
1837 static volatile jint sigint_count = 0; | |
1838 | |
1839 static void | |
1840 UserHandler(int sig, void *siginfo, void *context) { | |
1841 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
1842 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
1843 // don't want to flood the manager thread with sem_post requests. | |
1844 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
1845 return; | |
1846 | |
1847 // Ctrl-C is pressed during error reporting, likely because the error | |
1848 // handler fails to abort. Let VM die immediately. | |
1849 if (sig == SIGINT && is_error_reported()) { | |
1850 os::die(); | |
1851 } | |
1852 | |
1853 os::signal_notify(sig); | |
1854 } | |
1855 | |
1856 void* os::user_handler() { | |
1857 return CAST_FROM_FN_PTR(void*, UserHandler); | |
1858 } | |
1859 | |
1860 extern "C" { | |
1861 typedef void (*sa_handler_t)(int); | |
1862 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
1863 } | |
1864 | |
1865 void* os::signal(int signal_number, void* handler) { | |
1866 struct sigaction sigAct, oldSigAct; | |
1867 | |
1868 sigfillset(&(sigAct.sa_mask)); | |
1869 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
1870 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
1871 | |
1872 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
1873 // -1 means registration failed | |
1874 return (void *)-1; | |
1875 } | |
1876 | |
1877 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
1878 } | |
1879 | |
1880 void os::signal_raise(int signal_number) { | |
1881 ::raise(signal_number); | |
1882 } | |
1883 | |
1884 /* | |
1885 * The following code is moved from os.cpp for making this | |
1886 * code platform specific, which it is by its very nature. | |
1887 */ | |
1888 | |
1889 // Will be modified when max signal is changed to be dynamic | |
1890 int os::sigexitnum_pd() { | |
1891 return NSIG; | |
1892 } | |
1893 | |
1894 // a counter for each possible signal value | |
1895 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
1896 | |
1897 // Bsd(POSIX) specific hand shaking semaphore. | |
1898 #ifdef __APPLE__ | |
10405 | 1899 typedef semaphore_t os_semaphore_t; |
3960 | 1900 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) |
10405 | 1901 #define SEM_WAIT(sem) semaphore_wait(sem) |
1902 #define SEM_POST(sem) semaphore_signal(sem) | |
1903 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) | |
3960 | 1904 #else |
10405 | 1905 typedef sem_t os_semaphore_t; |
3960 | 1906 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) |
10405 | 1907 #define SEM_WAIT(sem) sem_wait(&sem) |
1908 #define SEM_POST(sem) sem_post(&sem) | |
1909 #define SEM_DESTROY(sem) sem_destroy(&sem) | |
3960 | 1910 #endif |
1911 | |
10405 | 1912 class Semaphore : public StackObj { |
1913 public: | |
1914 Semaphore(); | |
1915 ~Semaphore(); | |
1916 void signal(); | |
1917 void wait(); | |
1918 bool trywait(); | |
1919 bool timedwait(unsigned int sec, int nsec); | |
1920 private: | |
1921 jlong currenttime() const; | |
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1922 os_semaphore_t _semaphore; |
10405 | 1923 }; |
1924 | |
1925 Semaphore::Semaphore() : _semaphore(0) { | |
1926 SEM_INIT(_semaphore, 0); | |
1927 } | |
1928 | |
1929 Semaphore::~Semaphore() { | |
1930 SEM_DESTROY(_semaphore); | |
1931 } | |
1932 | |
1933 void Semaphore::signal() { | |
1934 SEM_POST(_semaphore); | |
1935 } | |
1936 | |
1937 void Semaphore::wait() { | |
1938 SEM_WAIT(_semaphore); | |
1939 } | |
1940 | |
1941 jlong Semaphore::currenttime() const { | |
1942 struct timeval tv; | |
1943 gettimeofday(&tv, NULL); | |
1944 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); | |
1945 } | |
1946 | |
1947 #ifdef __APPLE__ | |
1948 bool Semaphore::trywait() { | |
1949 return timedwait(0, 0); | |
1950 } | |
1951 | |
1952 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
1953 kern_return_t kr = KERN_ABORTED; | |
1954 mach_timespec_t waitspec; | |
1955 waitspec.tv_sec = sec; | |
1956 waitspec.tv_nsec = nsec; | |
1957 | |
1958 jlong starttime = currenttime(); | |
1959 | |
1960 kr = semaphore_timedwait(_semaphore, waitspec); | |
1961 while (kr == KERN_ABORTED) { | |
1962 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; | |
1963 | |
1964 jlong current = currenttime(); | |
1965 jlong passedtime = current - starttime; | |
1966 | |
1967 if (passedtime >= totalwait) { | |
1968 waitspec.tv_sec = 0; | |
1969 waitspec.tv_nsec = 0; | |
1970 } else { | |
1971 jlong waittime = totalwait - (current - starttime); | |
1972 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; | |
1973 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; | |
1974 } | |
1975 | |
1976 kr = semaphore_timedwait(_semaphore, waitspec); | |
1977 } | |
1978 | |
1979 return kr == KERN_SUCCESS; | |
1980 } | |
1981 | |
1982 #else | |
1983 | |
1984 bool Semaphore::trywait() { | |
1985 return sem_trywait(&_semaphore) == 0; | |
1986 } | |
1987 | |
1988 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
1989 struct timespec ts; | |
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1990 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); |
10405 | 1991 |
1992 while (1) { | |
1993 int result = sem_timedwait(&_semaphore, &ts); | |
1994 if (result == 0) { | |
1995 return true; | |
1996 } else if (errno == EINTR) { | |
1997 continue; | |
1998 } else if (errno == ETIMEDOUT) { | |
1999 return false; | |
2000 } else { | |
2001 return false; | |
2002 } | |
2003 } | |
2004 } | |
2005 | |
2006 #endif // __APPLE__ | |
2007 | |
2008 static os_semaphore_t sig_sem; | |
2009 static Semaphore sr_semaphore; | |
2010 | |
3960 | 2011 void os::signal_init_pd() { |
2012 // Initialize signal structures | |
2013 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
2014 | |
2015 // Initialize signal semaphore | |
2016 ::SEM_INIT(sig_sem, 0); | |
2017 } | |
2018 | |
2019 void os::signal_notify(int sig) { | |
2020 Atomic::inc(&pending_signals[sig]); | |
2021 ::SEM_POST(sig_sem); | |
2022 } | |
2023 | |
2024 static int check_pending_signals(bool wait) { | |
2025 Atomic::store(0, &sigint_count); | |
2026 for (;;) { | |
2027 for (int i = 0; i < NSIG + 1; i++) { | |
2028 jint n = pending_signals[i]; | |
2029 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
2030 return i; | |
2031 } | |
2032 } | |
2033 if (!wait) { | |
2034 return -1; | |
2035 } | |
2036 JavaThread *thread = JavaThread::current(); | |
2037 ThreadBlockInVM tbivm(thread); | |
2038 | |
2039 bool threadIsSuspended; | |
2040 do { | |
2041 thread->set_suspend_equivalent(); | |
2042 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
2043 ::SEM_WAIT(sig_sem); | |
2044 | |
2045 // were we externally suspended while we were waiting? | |
2046 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
2047 if (threadIsSuspended) { | |
2048 // | |
2049 // The semaphore has been incremented, but while we were waiting | |
2050 // another thread suspended us. We don't want to continue running | |
2051 // while suspended because that would surprise the thread that | |
2052 // suspended us. | |
2053 // | |
2054 ::SEM_POST(sig_sem); | |
2055 | |
2056 thread->java_suspend_self(); | |
2057 } | |
2058 } while (threadIsSuspended); | |
2059 } | |
2060 } | |
2061 | |
2062 int os::signal_lookup() { | |
2063 return check_pending_signals(false); | |
2064 } | |
2065 | |
2066 int os::signal_wait() { | |
2067 return check_pending_signals(true); | |
2068 } | |
2069 | |
2070 //////////////////////////////////////////////////////////////////////////////// | |
2071 // Virtual Memory | |
2072 | |
2073 int os::vm_page_size() { | |
2074 // Seems redundant as all get out | |
2075 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
2076 return os::Bsd::page_size(); | |
2077 } | |
2078 | |
2079 // Solaris allocates memory by pages. | |
2080 int os::vm_allocation_granularity() { | |
2081 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
2082 return os::Bsd::page_size(); | |
2083 } | |
2084 | |
2085 // Rationale behind this function: | |
2086 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
2087 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
2088 // samples for JITted code. Here we create private executable mapping over the code cache | |
2089 // and then we can use standard (well, almost, as mapping can change) way to provide | |
2090 // info for the reporting script by storing timestamp and location of symbol | |
2091 void bsd_wrap_code(char* base, size_t size) { | |
2092 static volatile jint cnt = 0; | |
2093 | |
2094 if (!UseOprofile) { | |
2095 return; | |
2096 } | |
2097 | |
2098 char buf[PATH_MAX + 1]; | |
2099 int num = Atomic::add(1, &cnt); | |
2100 | |
2101 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
2102 os::get_temp_directory(), os::current_process_id(), num); | |
2103 unlink(buf); | |
2104 | |
2105 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
2106 | |
2107 if (fd != -1) { | |
2108 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
2109 if (rv != (off_t)-1) { | |
2110 if (::write(fd, "", 1) == 1) { | |
2111 mmap(base, size, | |
2112 PROT_READ|PROT_WRITE|PROT_EXEC, | |
2113 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
2114 } | |
2115 } | |
2116 ::close(fd); | |
2117 unlink(buf); | |
2118 } | |
2119 } | |
2120 | |
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2121 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
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2122 int err) { |
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2123 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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2124 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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2125 strerror(err), err); |
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2126 } |
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2127 |
3960 | 2128 // NOTE: Bsd kernel does not really reserve the pages for us. |
2129 // All it does is to check if there are enough free pages | |
2130 // left at the time of mmap(). This could be a potential | |
2131 // problem. | |
6197 | 2132 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
3960 | 2133 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
2134 #ifdef __OpenBSD__ | |
2135 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
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2136 if (::mprotect(addr, size, prot) == 0) { |
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2137 return true; |
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2138 } |
3960 | 2139 #else |
2140 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
2141 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
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2142 if (res != (uintptr_t) MAP_FAILED) { |
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2143 return true; |
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2144 } |
3960 | 2145 #endif |
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2146 |
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2147 // Warn about any commit errors we see in non-product builds just |
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2148 // in case mmap() doesn't work as described on the man page. |
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2149 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) |
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2150 |
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2151 return false; |
3960 | 2152 } |
2153 | |
6197 | 2154 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
3960 | 2155 bool exec) { |
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2156 // alignment_hint is ignored on this OS |
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2157 return pd_commit_memory(addr, size, exec); |
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2158 } |
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2159 |
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2160 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
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2161 const char* mesg) { |
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2162 assert(mesg != NULL, "mesg must be specified"); |
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2163 if (!pd_commit_memory(addr, size, exec)) { |
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2164 // add extra info in product mode for vm_exit_out_of_memory(): |
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2165 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) |
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2166 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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2167 } |
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2168 } |
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2169 |
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|
2170 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
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2171 size_t alignment_hint, bool exec, |
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2172 const char* mesg) { |
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2173 // alignment_hint is ignored on this OS |
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2174 pd_commit_memory_or_exit(addr, size, exec, mesg); |
3960 | 2175 } |
2176 | |
6197 | 2177 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2178 } |
2179 | |
6197 | 2180 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
3960 | 2181 ::madvise(addr, bytes, MADV_DONTNEED); |
2182 } | |
2183 | |
2184 void os::numa_make_global(char *addr, size_t bytes) { | |
2185 } | |
2186 | |
2187 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
2188 } | |
2189 | |
2190 bool os::numa_topology_changed() { return false; } | |
2191 | |
2192 size_t os::numa_get_groups_num() { | |
2193 return 1; | |
2194 } | |
2195 | |
2196 int os::numa_get_group_id() { | |
2197 return 0; | |
2198 } | |
2199 | |
2200 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
2201 if (size > 0) { | |
2202 ids[0] = 0; | |
2203 return 1; | |
2204 } | |
2205 return 0; | |
2206 } | |
2207 | |
2208 bool os::get_page_info(char *start, page_info* info) { | |
2209 return false; | |
2210 } | |
2211 | |
2212 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
2213 return end; | |
2214 } | |
2215 | |
2216 | |
6197 | 2217 bool os::pd_uncommit_memory(char* addr, size_t size) { |
3960 | 2218 #ifdef __OpenBSD__ |
2219 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
2220 return ::mprotect(addr, size, PROT_NONE) == 0; | |
2221 #else | |
2222 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
2223 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
2224 return res != (uintptr_t) MAP_FAILED; | |
2225 #endif | |
2226 } | |
2227 | |
6197 | 2228 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
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2229 return os::commit_memory(addr, size, !ExecMem); |
3960 | 2230 } |
2231 | |
2232 // If this is a growable mapping, remove the guard pages entirely by | |
2233 // munmap()ping them. If not, just call uncommit_memory(). | |
2234 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
2235 return os::uncommit_memory(addr, size); | |
2236 } | |
2237 | |
2238 static address _highest_vm_reserved_address = NULL; | |
2239 | |
2240 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
2241 // at 'requested_addr'. If there are existing memory mappings at the same | |
2242 // location, however, they will be overwritten. If 'fixed' is false, | |
2243 // 'requested_addr' is only treated as a hint, the return value may or | |
2244 // may not start from the requested address. Unlike Bsd mmap(), this | |
2245 // function returns NULL to indicate failure. | |
2246 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
2247 char * addr; | |
2248 int flags; | |
2249 | |
2250 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
2251 if (fixed) { | |
2252 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
2253 flags |= MAP_FIXED; | |
2254 } | |
2255 | |
10157 | 2256 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
2257 // touch an uncommitted page. Otherwise, the read/write might | |
2258 // succeed if we have enough swap space to back the physical page. | |
2259 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
3960 | 2260 flags, -1, 0); |
2261 | |
2262 if (addr != MAP_FAILED) { | |
2263 // anon_mmap() should only get called during VM initialization, | |
2264 // don't need lock (actually we can skip locking even it can be called | |
2265 // from multiple threads, because _highest_vm_reserved_address is just a | |
2266 // hint about the upper limit of non-stack memory regions.) | |
2267 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
2268 _highest_vm_reserved_address = (address)addr + bytes; | |
2269 } | |
2270 } | |
2271 | |
2272 return addr == MAP_FAILED ? NULL : addr; | |
2273 } | |
2274 | |
2275 // Don't update _highest_vm_reserved_address, because there might be memory | |
2276 // regions above addr + size. If so, releasing a memory region only creates | |
2277 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
2278 // | |
2279 static int anon_munmap(char * addr, size_t size) { | |
2280 return ::munmap(addr, size) == 0; | |
2281 } | |
2282 | |
6197 | 2283 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
3960 | 2284 size_t alignment_hint) { |
2285 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
2286 } | |
2287 | |
6197 | 2288 bool os::pd_release_memory(char* addr, size_t size) { |
3960 | 2289 return anon_munmap(addr, size); |
2290 } | |
2291 | |
2292 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
2293 // Bsd wants the mprotect address argument to be page aligned. | |
2294 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
2295 | |
2296 // According to SUSv3, mprotect() should only be used with mappings | |
2297 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
2298 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
2299 // protection of malloc'ed or statically allocated memory). Check the | |
2300 // caller if you hit this assert. | |
2301 assert(addr == bottom, "sanity check"); | |
2302 | |
2303 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
2304 return ::mprotect(bottom, size, prot) == 0; | |
2305 } | |
2306 | |
2307 // Set protections specified | |
2308 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
2309 bool is_committed) { | |
2310 unsigned int p = 0; | |
2311 switch (prot) { | |
2312 case MEM_PROT_NONE: p = PROT_NONE; break; | |
2313 case MEM_PROT_READ: p = PROT_READ; break; | |
2314 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
2315 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
2316 default: | |
2317 ShouldNotReachHere(); | |
2318 } | |
2319 // is_committed is unused. | |
2320 return bsd_mprotect(addr, bytes, p); | |
2321 } | |
2322 | |
2323 bool os::guard_memory(char* addr, size_t size) { | |
2324 return bsd_mprotect(addr, size, PROT_NONE); | |
2325 } | |
2326 | |
2327 bool os::unguard_memory(char* addr, size_t size) { | |
2328 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
2329 } | |
2330 | |
2331 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
6918 | 2332 return false; |
3960 | 2333 } |
2334 | |
2335 // Large page support | |
2336 | |
2337 static size_t _large_page_size = 0; | |
2338 | |
2339 void os::large_page_init() { | |
2340 } | |
2341 | |
2342 | |
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2343 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
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2344 fatal("This code is not used or maintained."); |
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2345 |
3960 | 2346 // "exec" is passed in but not used. Creating the shared image for |
2347 // the code cache doesn't have an SHM_X executable permission to check. | |
2348 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
2349 | |
2350 key_t key = IPC_PRIVATE; | |
2351 char *addr; | |
2352 | |
2353 bool warn_on_failure = UseLargePages && | |
2354 (!FLAG_IS_DEFAULT(UseLargePages) || | |
2355 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
2356 ); | |
2357 char msg[128]; | |
2358 | |
2359 // Create a large shared memory region to attach to based on size. | |
2360 // Currently, size is the total size of the heap | |
2361 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
2362 if (shmid == -1) { | |
2363 // Possible reasons for shmget failure: | |
2364 // 1. shmmax is too small for Java heap. | |
2365 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
2366 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
2367 // 2. not enough large page memory. | |
2368 // > check available large pages: cat /proc/meminfo | |
2369 // > increase amount of large pages: | |
2370 // echo new_value > /proc/sys/vm/nr_hugepages | |
2371 // Note 1: different Bsd may use different name for this property, | |
2372 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
2373 // Note 2: it's possible there's enough physical memory available but | |
2374 // they are so fragmented after a long run that they can't | |
2375 // coalesce into large pages. Try to reserve large pages when | |
2376 // the system is still "fresh". | |
2377 if (warn_on_failure) { | |
2378 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
2379 warning(msg); | |
2380 } | |
2381 return NULL; | |
2382 } | |
2383 | |
2384 // attach to the region | |
2385 addr = (char*)shmat(shmid, req_addr, 0); | |
2386 int err = errno; | |
2387 | |
2388 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
2389 // will be deleted when it's detached by shmdt() or when the process | |
2390 // terminates. If shmat() is not successful this will remove the shared | |
2391 // segment immediately. | |
2392 shmctl(shmid, IPC_RMID, NULL); | |
2393 | |
2394 if ((intptr_t)addr == -1) { | |
2395 if (warn_on_failure) { | |
2396 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
2397 warning(msg); | |
2398 } | |
2399 return NULL; | |
2400 } | |
2401 | |
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2402 // The memory is committed |
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|
2403 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
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|
2404 |
3960 | 2405 return addr; |
2406 } | |
2407 | |
2408 bool os::release_memory_special(char* base, size_t bytes) { | |
10986
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|
2409 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
3960 | 2410 // detaching the SHM segment will also delete it, see reserve_memory_special() |
2411 int rslt = shmdt(base); | |
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|
2412 if (rslt == 0) { |
10986
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|
2413 tkr.record((address)base, bytes); |
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|
2414 return true; |
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|
2415 } else { |
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|
2416 tkr.discard(); |
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|
2417 return false; |
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|
2418 } |
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2419 |
3960 | 2420 } |
2421 | |
2422 size_t os::large_page_size() { | |
2423 return _large_page_size; | |
2424 } | |
2425 | |
2426 // HugeTLBFS allows application to commit large page memory on demand; | |
2427 // with SysV SHM the entire memory region must be allocated as shared | |
2428 // memory. | |
2429 bool os::can_commit_large_page_memory() { | |
2430 return UseHugeTLBFS; | |
2431 } | |
2432 | |
2433 bool os::can_execute_large_page_memory() { | |
2434 return UseHugeTLBFS; | |
2435 } | |
2436 | |
2437 // Reserve memory at an arbitrary address, only if that area is | |
2438 // available (and not reserved for something else). | |
2439 | |
6197 | 2440 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
3960 | 2441 const int max_tries = 10; |
2442 char* base[max_tries]; | |
2443 size_t size[max_tries]; | |
2444 const size_t gap = 0x000000; | |
2445 | |
2446 // Assert only that the size is a multiple of the page size, since | |
2447 // that's all that mmap requires, and since that's all we really know | |
2448 // about at this low abstraction level. If we need higher alignment, | |
2449 // we can either pass an alignment to this method or verify alignment | |
2450 // in one of the methods further up the call chain. See bug 5044738. | |
2451 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
2452 | |
2453 // Repeatedly allocate blocks until the block is allocated at the | |
2454 // right spot. Give up after max_tries. Note that reserve_memory() will | |
2455 // automatically update _highest_vm_reserved_address if the call is | |
2456 // successful. The variable tracks the highest memory address every reserved | |
2457 // by JVM. It is used to detect heap-stack collision if running with | |
2458 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
2459 // space than needed, it could confuse the collision detecting code. To | |
2460 // solve the problem, save current _highest_vm_reserved_address and | |
2461 // calculate the correct value before return. | |
2462 address old_highest = _highest_vm_reserved_address; | |
2463 | |
2464 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
2465 // if kernel honors the hint then we can return immediately. | |
2466 char * addr = anon_mmap(requested_addr, bytes, false); | |
2467 if (addr == requested_addr) { | |
2468 return requested_addr; | |
2469 } | |
2470 | |
2471 if (addr != NULL) { | |
2472 // mmap() is successful but it fails to reserve at the requested address | |
2473 anon_munmap(addr, bytes); | |
2474 } | |
2475 | |
2476 int i; | |
2477 for (i = 0; i < max_tries; ++i) { | |
2478 base[i] = reserve_memory(bytes); | |
2479 | |
2480 if (base[i] != NULL) { | |
2481 // Is this the block we wanted? | |
2482 if (base[i] == requested_addr) { | |
2483 size[i] = bytes; | |
2484 break; | |
2485 } | |
2486 | |
2487 // Does this overlap the block we wanted? Give back the overlapped | |
2488 // parts and try again. | |
2489 | |
2490 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
2491 if (top_overlap >= 0 && top_overlap < bytes) { | |
2492 unmap_memory(base[i], top_overlap); | |
2493 base[i] += top_overlap; | |
2494 size[i] = bytes - top_overlap; | |
2495 } else { | |
2496 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
2497 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
2498 unmap_memory(requested_addr, bottom_overlap); | |
2499 size[i] = bytes - bottom_overlap; | |
2500 } else { | |
2501 size[i] = bytes; | |
2502 } | |
2503 } | |
2504 } | |
2505 } | |
2506 | |
2507 // Give back the unused reserved pieces. | |
2508 | |
2509 for (int j = 0; j < i; ++j) { | |
2510 if (base[j] != NULL) { | |
2511 unmap_memory(base[j], size[j]); | |
2512 } | |
2513 } | |
2514 | |
2515 if (i < max_tries) { | |
2516 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
2517 return requested_addr; | |
2518 } else { | |
2519 _highest_vm_reserved_address = old_highest; | |
2520 return NULL; | |
2521 } | |
2522 } | |
2523 | |
2524 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
2525 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
2526 } | |
2527 | |
2528 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
2529 // Solaris uses poll(), bsd uses park(). | |
2530 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
2531 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
2532 // SIGSEGV, see 4355769. | |
2533 | |
2534 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
2535 assert(thread == Thread::current(), "thread consistency check"); | |
2536 | |
2537 ParkEvent * const slp = thread->_SleepEvent ; | |
2538 slp->reset() ; | |
2539 OrderAccess::fence() ; | |
2540 | |
2541 if (interruptible) { | |
2542 jlong prevtime = javaTimeNanos(); | |
2543 | |
2544 for (;;) { | |
2545 if (os::is_interrupted(thread, true)) { | |
2546 return OS_INTRPT; | |
2547 } | |
2548 | |
2549 jlong newtime = javaTimeNanos(); | |
2550 | |
2551 if (newtime - prevtime < 0) { | |
2552 // time moving backwards, should only happen if no monotonic clock | |
2553 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2554 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2555 } else { | |
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|
2556 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2557 } |
2558 | |
2559 if(millis <= 0) { | |
2560 return OS_OK; | |
2561 } | |
2562 | |
2563 prevtime = newtime; | |
2564 | |
2565 { | |
2566 assert(thread->is_Java_thread(), "sanity check"); | |
2567 JavaThread *jt = (JavaThread *) thread; | |
2568 ThreadBlockInVM tbivm(jt); | |
2569 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
2570 | |
2571 jt->set_suspend_equivalent(); | |
2572 // cleared by handle_special_suspend_equivalent_condition() or | |
2573 // java_suspend_self() via check_and_wait_while_suspended() | |
2574 | |
2575 slp->park(millis); | |
2576 | |
2577 // were we externally suspended while we were waiting? | |
2578 jt->check_and_wait_while_suspended(); | |
2579 } | |
2580 } | |
2581 } else { | |
2582 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
2583 jlong prevtime = javaTimeNanos(); | |
2584 | |
2585 for (;;) { | |
2586 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
2587 // the 1st iteration ... | |
2588 jlong newtime = javaTimeNanos(); | |
2589 | |
2590 if (newtime - prevtime < 0) { | |
2591 // time moving backwards, should only happen if no monotonic clock | |
2592 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
2593 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
2594 } else { | |
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2595 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
3960 | 2596 } |
2597 | |
2598 if(millis <= 0) break ; | |
2599 | |
2600 prevtime = newtime; | |
2601 slp->park(millis); | |
2602 } | |
2603 return OS_OK ; | |
2604 } | |
2605 } | |
2606 | |
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2607 void os::naked_short_sleep(jlong ms) { |
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2608 struct timespec req; |
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|
2609 |
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|
2610 assert(ms < 1000, "Un-interruptable sleep, short time use only"); |
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2611 req.tv_sec = 0; |
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2612 if (ms > 0) { |
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2613 req.tv_nsec = (ms % 1000) * 1000000; |
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2614 } |
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2615 else { |
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2616 req.tv_nsec = 1; |
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2617 } |
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2618 |
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2619 nanosleep(&req, NULL); |
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2620 |
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2621 return; |
3960 | 2622 } |
2623 | |
2624 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
2625 void os::infinite_sleep() { | |
2626 while (true) { // sleep forever ... | |
2627 ::sleep(100); // ... 100 seconds at a time | |
2628 } | |
2629 } | |
2630 | |
2631 // Used to convert frequent JVM_Yield() to nops | |
2632 bool os::dont_yield() { | |
2633 return DontYieldALot; | |
2634 } | |
2635 | |
2636 void os::yield() { | |
2637 sched_yield(); | |
2638 } | |
2639 | |
2640 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
2641 | |
2642 void os::yield_all(int attempts) { | |
2643 // Yields to all threads, including threads with lower priorities | |
2644 // Threads on Bsd are all with same priority. The Solaris style | |
2645 // os::yield_all() with nanosleep(1ms) is not necessary. | |
2646 sched_yield(); | |
2647 } | |
2648 | |
2649 // Called from the tight loops to possibly influence time-sharing heuristics | |
2650 void os::loop_breaker(int attempts) { | |
2651 os::yield_all(attempts); | |
2652 } | |
2653 | |
2654 //////////////////////////////////////////////////////////////////////////////// | |
2655 // thread priority support | |
2656 | |
2657 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
2658 // only supports dynamic priority, static priority must be zero. For real-time | |
2659 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
2660 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
2661 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
2662 // of 5 runs - Sep 2005). | |
2663 // | |
2664 // The following code actually changes the niceness of kernel-thread/LWP. It | |
2665 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
2666 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
2667 // threads. It has always been the case, but could change in the future. For | |
2668 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
2669 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
2670 | |
6918 | 2671 #if !defined(__APPLE__) |
4854
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2672 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2673 19, // 0 Entry should never be used |
2674 | |
2675 0, // 1 MinPriority | |
2676 3, // 2 | |
2677 6, // 3 | |
2678 | |
4854
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2679 10, // 4 |
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2680 15, // 5 NormPriority |
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2681 18, // 6 |
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2682 |
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2683 21, // 7 |
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2684 25, // 8 |
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2685 28, // 9 NearMaxPriority |
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2686 |
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2687 31, // 10 MaxPriority |
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2688 |
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2689 31 // 11 CriticalPriority |
3960 | 2690 }; |
6918 | 2691 #else |
3960 | 2692 /* Using Mach high-level priority assignments */ |
4854
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2693 int os::java_to_os_priority[CriticalPriority + 1] = { |
3960 | 2694 0, // 0 Entry should never be used (MINPRI_USER) |
2695 | |
2696 27, // 1 MinPriority | |
2697 28, // 2 | |
2698 29, // 3 | |
2699 | |
2700 30, // 4 | |
2701 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
2702 32, // 6 | |
2703 | |
2704 33, // 7 | |
2705 34, // 8 | |
2706 35, // 9 NearMaxPriority | |
2707 | |
4854
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2708 36, // 10 MaxPriority |
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2709 |
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2710 36 // 11 CriticalPriority |
3960 | 2711 }; |
2712 #endif | |
2713 | |
2714 static int prio_init() { | |
2715 if (ThreadPriorityPolicy == 1) { | |
2716 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
2717 // if effective uid is not root. Perhaps, a more elegant way of doing | |
2718 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
2719 if (geteuid() != 0) { | |
2720 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
2721 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
2722 } | |
2723 ThreadPriorityPolicy = 0; | |
2724 } | |
2725 } | |
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2726 if (UseCriticalJavaThreadPriority) { |
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2727 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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2728 } |
3960 | 2729 return 0; |
2730 } | |
2731 | |
2732 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
2733 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
2734 | |
2735 #ifdef __OpenBSD__ | |
2736 // OpenBSD pthread_setprio starves low priority threads | |
2737 return OS_OK; | |
2738 #elif defined(__FreeBSD__) | |
2739 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
2740 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2741 struct sched_param sp; | |
2742 int policy; | |
2743 pthread_t self = pthread_self(); | |
2744 | |
2745 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
2746 return OS_ERR; | |
2747 | |
2748 sp.sched_priority = newpri; | |
2749 if (pthread_setschedparam(self, policy, &sp) != 0) | |
2750 return OS_ERR; | |
2751 | |
2752 return OS_OK; | |
2753 #else | |
2754 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
2755 return (ret == 0) ? OS_OK : OS_ERR; | |
2756 #endif | |
2757 } | |
2758 | |
2759 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
2760 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
2761 *priority_ptr = java_to_os_priority[NormPriority]; | |
2762 return OS_OK; | |
2763 } | |
2764 | |
2765 errno = 0; | |
2766 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
2767 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
2768 #elif defined(__APPLE__) || defined(__NetBSD__) | |
2769 int policy; | |
2770 struct sched_param sp; | |
2771 | |
2772 pthread_getschedparam(pthread_self(), &policy, &sp); | |
2773 *priority_ptr = sp.sched_priority; | |
2774 #else | |
2775 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
2776 #endif | |
2777 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
2778 } | |
2779 | |
2780 // Hint to the underlying OS that a task switch would not be good. | |
2781 // Void return because it's a hint and can fail. | |
2782 void os::hint_no_preempt() {} | |
2783 | |
2784 //////////////////////////////////////////////////////////////////////////////// | |
2785 // suspend/resume support | |
2786 | |
2787 // the low-level signal-based suspend/resume support is a remnant from the | |
2788 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
2789 // within hotspot. Now there is a single use-case for this: | |
2790 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
2791 // that runs in the watcher thread. | |
2792 // The remaining code is greatly simplified from the more general suspension | |
2793 // code that used to be used. | |
2794 // | |
2795 // The protocol is quite simple: | |
2796 // - suspend: | |
2797 // - sends a signal to the target thread | |
2798 // - polls the suspend state of the osthread using a yield loop | |
2799 // - target thread signal handler (SR_handler) sets suspend state | |
2800 // and blocks in sigsuspend until continued | |
2801 // - resume: | |
2802 // - sets target osthread state to continue | |
2803 // - sends signal to end the sigsuspend loop in the SR_handler | |
2804 // | |
2805 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
2806 // | |
2807 | |
2808 static void resume_clear_context(OSThread *osthread) { | |
2809 osthread->set_ucontext(NULL); | |
2810 osthread->set_siginfo(NULL); | |
2811 } | |
2812 | |
2813 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
2814 osthread->set_ucontext(context); | |
2815 osthread->set_siginfo(siginfo); | |
2816 } | |
2817 | |
2818 // | |
2819 // Handler function invoked when a thread's execution is suspended or | |
2820 // resumed. We have to be careful that only async-safe functions are | |
2821 // called here (Note: most pthread functions are not async safe and | |
2822 // should be avoided.) | |
2823 // | |
2824 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
2825 // interface point of view, but sigwait() prevents the signal hander | |
2826 // from being run. libpthread would get very confused by not having | |
2827 // its signal handlers run and prevents sigwait()'s use with the | |
2828 // mutex granting granting signal. | |
2829 // | |
10405 | 2830 // Currently only ever called on the VMThread or JavaThread |
3960 | 2831 // |
2832 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
2833 // Save and restore errno to avoid confusing native code with EINTR | |
2834 // after sigsuspend. | |
2835 int old_errno = errno; | |
2836 | |
2837 Thread* thread = Thread::current(); | |
2838 OSThread* osthread = thread->osthread(); | |
10405 | 2839 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
2840 | |
2841 os::SuspendResume::State current = osthread->sr.state(); | |
2842 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
3960 | 2843 suspend_save_context(osthread, siginfo, context); |
2844 | |
10405 | 2845 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
2846 os::SuspendResume::State state = osthread->sr.suspended(); | |
2847 if (state == os::SuspendResume::SR_SUSPENDED) { | |
2848 sigset_t suspend_set; // signals for sigsuspend() | |
2849 | |
2850 // get current set of blocked signals and unblock resume signal | |
2851 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
2852 sigdelset(&suspend_set, SR_signum); | |
2853 | |
2854 sr_semaphore.signal(); | |
2855 // wait here until we are resumed | |
2856 while (1) { | |
2857 sigsuspend(&suspend_set); | |
2858 | |
2859 os::SuspendResume::State result = osthread->sr.running(); | |
2860 if (result == os::SuspendResume::SR_RUNNING) { | |
2861 sr_semaphore.signal(); | |
2862 break; | |
2863 } else if (result != os::SuspendResume::SR_SUSPENDED) { | |
2864 ShouldNotReachHere(); | |
2865 } | |
2866 } | |
2867 | |
2868 } else if (state == os::SuspendResume::SR_RUNNING) { | |
2869 // request was cancelled, continue | |
2870 } else { | |
2871 ShouldNotReachHere(); | |
2872 } | |
3960 | 2873 |
2874 resume_clear_context(osthread); | |
10405 | 2875 } else if (current == os::SuspendResume::SR_RUNNING) { |
2876 // request was cancelled, continue | |
2877 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
2878 // ignore | |
3960 | 2879 } else { |
10405 | 2880 // ignore |
3960 | 2881 } |
2882 | |
2883 errno = old_errno; | |
2884 } | |
2885 | |
2886 | |
2887 static int SR_initialize() { | |
2888 struct sigaction act; | |
2889 char *s; | |
2890 /* Get signal number to use for suspend/resume */ | |
2891 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
2892 int sig = ::strtol(s, 0, 10); | |
2893 if (sig > 0 || sig < NSIG) { | |
2894 SR_signum = sig; | |
2895 } | |
2896 } | |
2897 | |
2898 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
2899 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
2900 | |
2901 sigemptyset(&SR_sigset); | |
2902 sigaddset(&SR_sigset, SR_signum); | |
2903 | |
2904 /* Set up signal handler for suspend/resume */ | |
2905 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
2906 act.sa_handler = (void (*)(int)) SR_handler; | |
2907 | |
2908 // SR_signum is blocked by default. | |
2909 // 4528190 - We also need to block pthread restart signal (32 on all | |
2910 // supported Bsd platforms). Note that BsdThreads need to block | |
2911 // this signal for all threads to work properly. So we don't have | |
2912 // to use hard-coded signal number when setting up the mask. | |
2913 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
2914 | |
2915 if (sigaction(SR_signum, &act, 0) == -1) { | |
2916 return -1; | |
2917 } | |
2918 | |
2919 // Save signal flag | |
2920 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
2921 return 0; | |
2922 } | |
2923 | |
10405 | 2924 static int sr_notify(OSThread* osthread) { |
2925 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
2926 assert_status(status == 0, status, "pthread_kill"); | |
2927 return status; | |
2928 } | |
2929 | |
2930 // "Randomly" selected value for how long we want to spin | |
2931 // before bailing out on suspending a thread, also how often | |
2932 // we send a signal to a thread we want to resume | |
2933 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
2934 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
3960 | 2935 |
2936 // returns true on success and false on error - really an error is fatal | |
2937 // but this seems the normal response to library errors | |
2938 static bool do_suspend(OSThread* osthread) { | |
10405 | 2939 assert(osthread->sr.is_running(), "thread should be running"); |
2940 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
2941 | |
3960 | 2942 // mark as suspended and send signal |
10405 | 2943 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
2944 // failed to switch, state wasn't running? | |
2945 ShouldNotReachHere(); | |
3960 | 2946 return false; |
2947 } | |
10405 | 2948 |
2949 if (sr_notify(osthread) != 0) { | |
2950 ShouldNotReachHere(); | |
2951 } | |
2952 | |
2953 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
2954 while (true) { | |
2955 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
2956 break; | |
2957 } else { | |
2958 // timeout | |
2959 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
2960 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
2961 return false; | |
2962 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
2963 // make sure that we consume the signal on the semaphore as well | |
2964 sr_semaphore.wait(); | |
2965 break; | |
2966 } else { | |
2967 ShouldNotReachHere(); | |
2968 return false; | |
2969 } | |
2970 } | |
2971 } | |
2972 | |
2973 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
2974 return true; | |
3960 | 2975 } |
2976 | |
2977 static void do_resume(OSThread* osthread) { | |
2978 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
10405 | 2979 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
2980 | |
2981 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
2982 // failed to switch to WAKEUP_REQUEST | |
2983 ShouldNotReachHere(); | |
2984 return; | |
2985 } | |
2986 | |
2987 while (true) { | |
2988 if (sr_notify(osthread) == 0) { | |
2989 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
2990 if (osthread->sr.is_running()) { | |
2991 return; | |
2992 } | |
2993 } | |
2994 } else { | |
2995 ShouldNotReachHere(); | |
3960 | 2996 } |
2997 } | |
10405 | 2998 |
2999 guarantee(osthread->sr.is_running(), "Must be running!"); | |
3960 | 3000 } |
3001 | |
3002 //////////////////////////////////////////////////////////////////////////////// | |
3003 // interrupt support | |
3004 | |
3005 void os::interrupt(Thread* thread) { | |
3006 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3007 "possibility of dangling Thread pointer"); | |
3008 | |
3009 OSThread* osthread = thread->osthread(); | |
3010 | |
3011 if (!osthread->interrupted()) { | |
3012 osthread->set_interrupted(true); | |
3013 // More than one thread can get here with the same value of osthread, | |
3014 // resulting in multiple notifications. We do, however, want the store | |
3015 // to interrupted() to be visible to other threads before we execute unpark(). | |
3016 OrderAccess::fence(); | |
3017 ParkEvent * const slp = thread->_SleepEvent ; | |
3018 if (slp != NULL) slp->unpark() ; | |
3019 } | |
3020 | |
3021 // For JSR166. Unpark even if interrupt status already was set | |
3022 if (thread->is_Java_thread()) | |
3023 ((JavaThread*)thread)->parker()->unpark(); | |
3024 | |
3025 ParkEvent * ev = thread->_ParkEvent ; | |
3026 if (ev != NULL) ev->unpark() ; | |
3027 | |
3028 } | |
3029 | |
3030 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
3031 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
3032 "possibility of dangling Thread pointer"); | |
3033 | |
3034 OSThread* osthread = thread->osthread(); | |
3035 | |
3036 bool interrupted = osthread->interrupted(); | |
3037 | |
3038 if (interrupted && clear_interrupted) { | |
3039 osthread->set_interrupted(false); | |
3040 // consider thread->_SleepEvent->reset() ... optional optimization | |
3041 } | |
3042 | |
3043 return interrupted; | |
3044 } | |
3045 | |
3046 /////////////////////////////////////////////////////////////////////////////////// | |
3047 // signal handling (except suspend/resume) | |
3048 | |
3049 // This routine may be used by user applications as a "hook" to catch signals. | |
3050 // The user-defined signal handler must pass unrecognized signals to this | |
3051 // routine, and if it returns true (non-zero), then the signal handler must | |
3052 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
3053 // routine will never retun false (zero), but instead will execute a VM panic | |
3054 // routine kill the process. | |
3055 // | |
3056 // If this routine returns false, it is OK to call it again. This allows | |
3057 // the user-defined signal handler to perform checks either before or after | |
3058 // the VM performs its own checks. Naturally, the user code would be making | |
3059 // a serious error if it tried to handle an exception (such as a null check | |
3060 // or breakpoint) that the VM was generating for its own correct operation. | |
3061 // | |
3062 // This routine may recognize any of the following kinds of signals: | |
3063 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
3064 // It should be consulted by handlers for any of those signals. | |
3065 // | |
3066 // The caller of this routine must pass in the three arguments supplied | |
3067 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
3068 // field of the structure passed to sigaction(). This routine assumes that | |
3069 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
3070 // | |
3071 // Note that the VM will print warnings if it detects conflicting signal | |
3072 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
3073 // | |
3074 extern "C" JNIEXPORT int | |
3075 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
3076 void* ucontext, int abort_if_unrecognized); | |
3077 | |
3078 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
3079 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
8067 | 3080 int orig_errno = errno; // Preserve errno value over signal handler. |
3960 | 3081 JVM_handle_bsd_signal(sig, info, uc, true); |
8067 | 3082 errno = orig_errno; |
3960 | 3083 } |
3084 | |
3085 | |
3086 // This boolean allows users to forward their own non-matching signals | |
3087 // to JVM_handle_bsd_signal, harmlessly. | |
3088 bool os::Bsd::signal_handlers_are_installed = false; | |
3089 | |
3090 // For signal-chaining | |
3091 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
3092 unsigned int os::Bsd::sigs = 0; | |
3093 bool os::Bsd::libjsig_is_loaded = false; | |
3094 typedef struct sigaction *(*get_signal_t)(int); | |
3095 get_signal_t os::Bsd::get_signal_action = NULL; | |
3096 | |
3097 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
3098 struct sigaction *actp = NULL; | |
3099 | |
3100 if (libjsig_is_loaded) { | |
3101 // Retrieve the old signal handler from libjsig | |
3102 actp = (*get_signal_action)(sig); | |
3103 } | |
3104 if (actp == NULL) { | |
3105 // Retrieve the preinstalled signal handler from jvm | |
3106 actp = get_preinstalled_handler(sig); | |
3107 } | |
3108 | |
3109 return actp; | |
3110 } | |
3111 | |
3112 static bool call_chained_handler(struct sigaction *actp, int sig, | |
3113 siginfo_t *siginfo, void *context) { | |
3114 // Call the old signal handler | |
3115 if (actp->sa_handler == SIG_DFL) { | |
3116 // It's more reasonable to let jvm treat it as an unexpected exception | |
3117 // instead of taking the default action. | |
3118 return false; | |
3119 } else if (actp->sa_handler != SIG_IGN) { | |
3120 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
3121 // automaticlly block the signal | |
3122 sigaddset(&(actp->sa_mask), sig); | |
3123 } | |
3124 | |
3125 sa_handler_t hand; | |
3126 sa_sigaction_t sa; | |
3127 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
3128 // retrieve the chained handler | |
3129 if (siginfo_flag_set) { | |
3130 sa = actp->sa_sigaction; | |
3131 } else { | |
3132 hand = actp->sa_handler; | |
3133 } | |
3134 | |
3135 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
3136 actp->sa_handler = SIG_DFL; | |
3137 } | |
3138 | |
3139 // try to honor the signal mask | |
3140 sigset_t oset; | |
3141 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
3142 | |
3143 // call into the chained handler | |
3144 if (siginfo_flag_set) { | |
3145 (*sa)(sig, siginfo, context); | |
3146 } else { | |
3147 (*hand)(sig); | |
3148 } | |
3149 | |
3150 // restore the signal mask | |
3151 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
3152 } | |
3153 // Tell jvm's signal handler the signal is taken care of. | |
3154 return true; | |
3155 } | |
3156 | |
3157 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
3158 bool chained = false; | |
3159 // signal-chaining | |
3160 if (UseSignalChaining) { | |
3161 struct sigaction *actp = get_chained_signal_action(sig); | |
3162 if (actp != NULL) { | |
3163 chained = call_chained_handler(actp, sig, siginfo, context); | |
3164 } | |
3165 } | |
3166 return chained; | |
3167 } | |
3168 | |
3169 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
3170 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
3171 return &sigact[sig]; | |
3172 } | |
3173 return NULL; | |
3174 } | |
3175 | |
3176 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
3177 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3178 sigact[sig] = oldAct; | |
3179 sigs |= (unsigned int)1 << sig; | |
3180 } | |
3181 | |
3182 // for diagnostic | |
3183 int os::Bsd::sigflags[MAXSIGNUM]; | |
3184 | |
3185 int os::Bsd::get_our_sigflags(int sig) { | |
3186 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3187 return sigflags[sig]; | |
3188 } | |
3189 | |
3190 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
3191 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3192 sigflags[sig] = flags; | |
3193 } | |
3194 | |
3195 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
3196 // Check for overwrite. | |
3197 struct sigaction oldAct; | |
3198 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
3199 | |
3200 void* oldhand = oldAct.sa_sigaction | |
3201 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3202 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3203 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
3204 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
3205 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
3206 if (AllowUserSignalHandlers || !set_installed) { | |
3207 // Do not overwrite; user takes responsibility to forward to us. | |
3208 return; | |
3209 } else if (UseSignalChaining) { | |
3210 // save the old handler in jvm | |
3211 save_preinstalled_handler(sig, oldAct); | |
3212 // libjsig also interposes the sigaction() call below and saves the | |
3213 // old sigaction on it own. | |
3214 } else { | |
3215 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
3216 "%#lx for signal %d.", (long)oldhand, sig)); | |
3217 } | |
3218 } | |
3219 | |
3220 struct sigaction sigAct; | |
3221 sigfillset(&(sigAct.sa_mask)); | |
3222 sigAct.sa_handler = SIG_DFL; | |
3223 if (!set_installed) { | |
3224 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3225 } else { | |
3226 sigAct.sa_sigaction = signalHandler; | |
3227 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
3228 } | |
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3229 #ifdef __APPLE__ |
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3230 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV |
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3231 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" |
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3232 // if the signal handler declares it will handle it on alternate stack. |
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3233 // Notice we only declare we will handle it on alt stack, but we are not |
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3234 // actually going to use real alt stack - this is just a workaround. |
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3235 // Please see ux_exception.c, method catch_mach_exception_raise for details |
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3236 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c |
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3237 if (sig == SIGSEGV) { |
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3238 sigAct.sa_flags |= SA_ONSTACK; |
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3239 } |
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3240 #endif |
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3241 |
3960 | 3242 // Save flags, which are set by ours |
3243 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
3244 sigflags[sig] = sigAct.sa_flags; | |
3245 | |
3246 int ret = sigaction(sig, &sigAct, &oldAct); | |
3247 assert(ret == 0, "check"); | |
3248 | |
3249 void* oldhand2 = oldAct.sa_sigaction | |
3250 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
3251 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
3252 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
3253 } | |
3254 | |
3255 // install signal handlers for signals that HotSpot needs to | |
3256 // handle in order to support Java-level exception handling. | |
3257 | |
3258 void os::Bsd::install_signal_handlers() { | |
3259 if (!signal_handlers_are_installed) { | |
3260 signal_handlers_are_installed = true; | |
3261 | |
3262 // signal-chaining | |
3263 typedef void (*signal_setting_t)(); | |
3264 signal_setting_t begin_signal_setting = NULL; | |
3265 signal_setting_t end_signal_setting = NULL; | |
3266 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3267 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
3268 if (begin_signal_setting != NULL) { | |
3269 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
3270 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
3271 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
3272 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
3273 libjsig_is_loaded = true; | |
3274 assert(UseSignalChaining, "should enable signal-chaining"); | |
3275 } | |
3276 if (libjsig_is_loaded) { | |
3277 // Tell libjsig jvm is setting signal handlers | |
3278 (*begin_signal_setting)(); | |
3279 } | |
3280 | |
3281 set_signal_handler(SIGSEGV, true); | |
3282 set_signal_handler(SIGPIPE, true); | |
3283 set_signal_handler(SIGBUS, true); | |
3284 set_signal_handler(SIGILL, true); | |
3285 set_signal_handler(SIGFPE, true); | |
3286 set_signal_handler(SIGXFSZ, true); | |
3287 | |
3288 #if defined(__APPLE__) | |
3289 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
3290 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
3291 // signal handler that's placed on our process by CrashReporter. This disables | |
3292 // CrashReporter-based reporting. | |
3293 // | |
3294 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
3295 // on caught fatal signals. | |
3296 // | |
3297 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
3298 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
3299 // exception handling, while leaving the standard BSD signal handlers functional. | |
3300 kern_return_t kr; | |
3301 kr = task_set_exception_ports(mach_task_self(), | |
3302 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
3303 MACH_PORT_NULL, | |
3304 EXCEPTION_STATE_IDENTITY, | |
3305 MACHINE_THREAD_STATE); | |
3306 | |
3307 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
3308 #endif | |
3309 | |
3310 if (libjsig_is_loaded) { | |
3311 // Tell libjsig jvm finishes setting signal handlers | |
3312 (*end_signal_setting)(); | |
3313 } | |
3314 | |
3315 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
3316 // and if UserSignalHandler is installed all bets are off | |
3317 if (CheckJNICalls) { | |
3318 if (libjsig_is_loaded) { | |
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3319 if (PrintJNIResolving) { |
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3320 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
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3321 } |
3960 | 3322 check_signals = false; |
3323 } | |
3324 if (AllowUserSignalHandlers) { | |
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3325 if (PrintJNIResolving) { |
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3326 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
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3327 } |
3960 | 3328 check_signals = false; |
3329 } | |
3330 } | |
3331 } | |
3332 } | |
3333 | |
3334 | |
3335 ///// | |
3336 // glibc on Bsd platform uses non-documented flag | |
3337 // to indicate, that some special sort of signal | |
3338 // trampoline is used. | |
3339 // We will never set this flag, and we should | |
3340 // ignore this flag in our diagnostic | |
3341 #ifdef SIGNIFICANT_SIGNAL_MASK | |
3342 #undef SIGNIFICANT_SIGNAL_MASK | |
3343 #endif | |
3344 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
3345 | |
3346 static const char* get_signal_handler_name(address handler, | |
3347 char* buf, int buflen) { | |
3348 int offset; | |
3349 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
3350 if (found) { | |
3351 // skip directory names | |
3352 const char *p1, *p2; | |
3353 p1 = buf; | |
3354 size_t len = strlen(os::file_separator()); | |
3355 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
3356 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
3357 } else { | |
3358 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
3359 } | |
3360 return buf; | |
3361 } | |
3362 | |
3363 static void print_signal_handler(outputStream* st, int sig, | |
3364 char* buf, size_t buflen) { | |
3365 struct sigaction sa; | |
3366 | |
3367 sigaction(sig, NULL, &sa); | |
3368 | |
3369 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
3370 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3371 | |
3372 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
3373 | |
3374 address handler = (sa.sa_flags & SA_SIGINFO) | |
3375 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
3376 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
3377 | |
3378 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
3379 st->print("SIG_DFL"); | |
3380 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
3381 st->print("SIG_IGN"); | |
3382 } else { | |
3383 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
3384 } | |
3385 | |
14410 | 3386 st->print(", sa_mask[0]="); |
3387 os::Posix::print_signal_set_short(st, &sa.sa_mask); | |
3960 | 3388 |
3389 address rh = VMError::get_resetted_sighandler(sig); | |
3390 // May be, handler was resetted by VMError? | |
3391 if(rh != NULL) { | |
3392 handler = rh; | |
3393 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
3394 } | |
3395 | |
14410 | 3396 st->print(", sa_flags="); |
3397 os::Posix::print_sa_flags(st, sa.sa_flags); | |
3960 | 3398 |
3399 // Check: is it our handler? | |
3400 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
3401 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
3402 // It is our signal handler | |
3403 // check for flags, reset system-used one! | |
3404 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3405 st->print( | |
3406 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
3407 os::Bsd::get_our_sigflags(sig)); | |
3408 } | |
3409 } | |
3410 st->cr(); | |
3411 } | |
3412 | |
3413 | |
3414 #define DO_SIGNAL_CHECK(sig) \ | |
3415 if (!sigismember(&check_signal_done, sig)) \ | |
3416 os::Bsd::check_signal_handler(sig) | |
3417 | |
3418 // This method is a periodic task to check for misbehaving JNI applications | |
3419 // under CheckJNI, we can add any periodic checks here | |
3420 | |
3421 void os::run_periodic_checks() { | |
3422 | |
3423 if (check_signals == false) return; | |
3424 | |
3425 // SEGV and BUS if overridden could potentially prevent | |
3426 // generation of hs*.log in the event of a crash, debugging | |
3427 // such a case can be very challenging, so we absolutely | |
3428 // check the following for a good measure: | |
3429 DO_SIGNAL_CHECK(SIGSEGV); | |
3430 DO_SIGNAL_CHECK(SIGILL); | |
3431 DO_SIGNAL_CHECK(SIGFPE); | |
3432 DO_SIGNAL_CHECK(SIGBUS); | |
3433 DO_SIGNAL_CHECK(SIGPIPE); | |
3434 DO_SIGNAL_CHECK(SIGXFSZ); | |
3435 | |
3436 | |
3437 // ReduceSignalUsage allows the user to override these handlers | |
3438 // see comments at the very top and jvm_solaris.h | |
3439 if (!ReduceSignalUsage) { | |
3440 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
3441 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
3442 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
3443 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
3444 } | |
3445 | |
3446 DO_SIGNAL_CHECK(SR_signum); | |
3447 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
3448 } | |
3449 | |
3450 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
3451 | |
3452 static os_sigaction_t os_sigaction = NULL; | |
3453 | |
3454 void os::Bsd::check_signal_handler(int sig) { | |
3455 char buf[O_BUFLEN]; | |
3456 address jvmHandler = NULL; | |
3457 | |
3458 | |
3459 struct sigaction act; | |
3460 if (os_sigaction == NULL) { | |
3461 // only trust the default sigaction, in case it has been interposed | |
3462 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
3463 if (os_sigaction == NULL) return; | |
3464 } | |
3465 | |
3466 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
3467 | |
3468 | |
3469 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
3470 | |
3471 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
3472 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
3473 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
3474 | |
3475 | |
3476 switch(sig) { | |
3477 case SIGSEGV: | |
3478 case SIGBUS: | |
3479 case SIGFPE: | |
3480 case SIGPIPE: | |
3481 case SIGILL: | |
3482 case SIGXFSZ: | |
3483 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
3484 break; | |
3485 | |
3486 case SHUTDOWN1_SIGNAL: | |
3487 case SHUTDOWN2_SIGNAL: | |
3488 case SHUTDOWN3_SIGNAL: | |
3489 case BREAK_SIGNAL: | |
3490 jvmHandler = (address)user_handler(); | |
3491 break; | |
3492 | |
3493 case INTERRUPT_SIGNAL: | |
3494 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
3495 break; | |
3496 | |
3497 default: | |
3498 if (sig == SR_signum) { | |
3499 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
3500 } else { | |
3501 return; | |
3502 } | |
3503 break; | |
3504 } | |
3505 | |
3506 if (thisHandler != jvmHandler) { | |
3507 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
3508 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
3509 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
3510 // No need to check this sig any longer | |
3511 sigaddset(&check_signal_done, sig); | |
3512 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
3513 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
3514 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
3515 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
3516 // No need to check this sig any longer | |
3517 sigaddset(&check_signal_done, sig); | |
3518 } | |
3519 | |
3520 // Dump all the signal | |
3521 if (sigismember(&check_signal_done, sig)) { | |
3522 print_signal_handlers(tty, buf, O_BUFLEN); | |
3523 } | |
3524 } | |
3525 | |
3526 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
3527 | |
3528 extern bool signal_name(int signo, char* buf, size_t len); | |
3529 | |
3530 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
3531 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
3532 // signal | |
3533 if (!signal_name(exception_code, buf, size)) { | |
3534 jio_snprintf(buf, size, "SIG%d", exception_code); | |
3535 } | |
3536 return buf; | |
3537 } else { | |
3538 return NULL; | |
3539 } | |
3540 } | |
3541 | |
3542 // this is called _before_ the most of global arguments have been parsed | |
3543 void os::init(void) { | |
3544 char dummy; /* used to get a guess on initial stack address */ | |
3545 // first_hrtime = gethrtime(); | |
3546 | |
3547 // With BsdThreads the JavaMain thread pid (primordial thread) | |
3548 // is different than the pid of the java launcher thread. | |
3549 // So, on Bsd, the launcher thread pid is passed to the VM | |
3550 // via the sun.java.launcher.pid property. | |
3551 // Use this property instead of getpid() if it was correctly passed. | |
3552 // See bug 6351349. | |
3553 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
3554 | |
3555 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
3556 | |
3557 clock_tics_per_sec = CLK_TCK; | |
3558 | |
3559 init_random(1234567); | |
3560 | |
3561 ThreadCritical::initialize(); | |
3562 | |
3563 Bsd::set_page_size(getpagesize()); | |
3564 if (Bsd::page_size() == -1) { | |
3565 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
3566 strerror(errno))); | |
3567 } | |
3568 init_page_sizes((size_t) Bsd::page_size()); | |
3569 | |
3570 Bsd::initialize_system_info(); | |
3571 | |
3572 // main_thread points to the aboriginal thread | |
3573 Bsd::_main_thread = pthread_self(); | |
3574 | |
3575 Bsd::clock_init(); | |
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e4f478e7781b
8027294: Prepare hotspot for non TOD based uptime counter
jbachorik
parents:
12856
diff
changeset
|
3576 initial_time_count = javaTimeNanos(); |
3960 | 3577 |
3578 #ifdef __APPLE__ | |
3579 // XXXDARWIN | |
3580 // Work around the unaligned VM callbacks in hotspot's | |
3581 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
3582 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
3583 // alignment when doing symbol lookup. To work around this, we force early | |
3584 // binding of all symbols now, thus binding when alignment is known-good. | |
3585 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
3586 #endif | |
3587 } | |
3588 | |
3589 // To install functions for atexit system call | |
3590 extern "C" { | |
3591 static void perfMemory_exit_helper() { | |
3592 perfMemory_exit(); | |
3593 } | |
3594 } | |
3595 | |
3596 // this is called _after_ the global arguments have been parsed | |
3597 jint os::init_2(void) | |
3598 { | |
3599 // Allocate a single page and mark it as readable for safepoint polling | |
3600 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
3601 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
3602 | |
3603 os::set_polling_page( polling_page ); | |
3604 | |
3605 #ifndef PRODUCT | |
3606 if(Verbose && PrintMiscellaneous) | |
3607 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
3608 #endif | |
3609 | |
3610 if (!UseMembar) { | |
3611 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
|
3612 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
3960 | 3613 os::set_memory_serialize_page( mem_serialize_page ); |
3614 | |
3615 #ifndef PRODUCT | |
3616 if(Verbose && PrintMiscellaneous) | |
3617 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
3618 #endif | |
3619 } | |
3620 | |
3621 // initialize suspend/resume support - must do this before signal_sets_init() | |
3622 if (SR_initialize() != 0) { | |
3623 perror("SR_initialize failed"); | |
3624 return JNI_ERR; | |
3625 } | |
3626 | |
3627 Bsd::signal_sets_init(); | |
3628 Bsd::install_signal_handlers(); | |
3629 | |
3630 // Check minimum allowable stack size for thread creation and to initialize | |
3631 // the java system classes, including StackOverflowError - depends on page | |
3632 // size. Add a page for compiler2 recursion in main thread. | |
3633 // Add in 2*BytesPerWord times page size to account for VM stack during | |
3634 // class initialization depending on 32 or 64 bit VM. | |
3635 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
3636 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
3637 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
3638 | |
3639 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
3640 if (threadStackSizeInBytes != 0 && | |
3641 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
3642 tty->print_cr("\nThe stack size specified is too small, " | |
3643 "Specify at least %dk", | |
3644 os::Bsd::min_stack_allowed/ K); | |
3645 return JNI_ERR; | |
3646 } | |
3647 | |
3648 // Make the stack size a multiple of the page size so that | |
3649 // the yellow/red zones can be guarded. | |
3650 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
3651 vm_page_size())); | |
3652 | |
3653 if (MaxFDLimit) { | |
3654 // set the number of file descriptors to max. print out error | |
3655 // if getrlimit/setrlimit fails but continue regardless. | |
3656 struct rlimit nbr_files; | |
3657 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
3658 if (status != 0) { | |
3659 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3660 perror("os::init_2 getrlimit failed"); | |
3661 } else { | |
3662 nbr_files.rlim_cur = nbr_files.rlim_max; | |
3663 | |
3664 #ifdef __APPLE__ | |
3665 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
3666 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
3667 // be used instead | |
3668 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
3669 #endif | |
3670 | |
3671 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
3672 if (status != 0) { | |
3673 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
3674 perror("os::init_2 setrlimit failed"); | |
3675 } | |
3676 } | |
3677 } | |
3678 | |
3679 // at-exit methods are called in the reverse order of their registration. | |
3680 // atexit functions are called on return from main or as a result of a | |
3681 // call to exit(3C). There can be only 32 of these functions registered | |
3682 // and atexit() does not set errno. | |
3683 | |
3684 if (PerfAllowAtExitRegistration) { | |
3685 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
3686 // atexit functions can be delayed until process exit time, which | |
3687 // can be problematic for embedded VM situations. Embedded VMs should | |
3688 // call DestroyJavaVM() to assure that VM resources are released. | |
3689 | |
3690 // note: perfMemory_exit_helper atexit function may be removed in | |
3691 // the future if the appropriate cleanup code can be added to the | |
3692 // VM_Exit VMOperation's doit method. | |
3693 if (atexit(perfMemory_exit_helper) != 0) { | |
3694 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
3695 } | |
3696 } | |
3697 | |
3698 // initialize thread priority policy | |
3699 prio_init(); | |
3700 | |
4006 | 3701 #ifdef __APPLE__ |
3702 // dynamically link to objective c gc registration | |
3703 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
3704 if (handleLibObjc != NULL) { | |
3705 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
3706 } | |
3707 #endif | |
3708 | |
3960 | 3709 return JNI_OK; |
3710 } | |
3711 | |
3712 // this is called at the end of vm_initialization | |
3713 void os::init_3(void) { } | |
3714 | |
3715 // Mark the polling page as unreadable | |
3716 void os::make_polling_page_unreadable(void) { | |
3717 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
3718 fatal("Could not disable polling page"); | |
3719 }; | |
3720 | |
3721 // Mark the polling page as readable | |
3722 void os::make_polling_page_readable(void) { | |
3723 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
3724 fatal("Could not enable polling page"); | |
3725 } | |
3726 }; | |
3727 | |
3728 int os::active_processor_count() { | |
3729 return _processor_count; | |
3730 } | |
3731 | |
4006 | 3732 void os::set_native_thread_name(const char *name) { |
3733 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
3734 // This is only supported in Snow Leopard and beyond | |
3735 if (name != NULL) { | |
3736 // Add a "Java: " prefix to the name | |
3737 char buf[MAXTHREADNAMESIZE]; | |
3738 snprintf(buf, sizeof(buf), "Java: %s", name); | |
3739 pthread_setname_np(buf); | |
3740 } | |
3741 #endif | |
3742 } | |
3743 | |
3960 | 3744 bool os::distribute_processes(uint length, uint* distribution) { |
3745 // Not yet implemented. | |
3746 return false; | |
3747 } | |
3748 | |
3749 bool os::bind_to_processor(uint processor_id) { | |
3750 // Not yet implemented. | |
3751 return false; | |
3752 } | |
3753 | |
10405 | 3754 void os::SuspendedThreadTask::internal_do_task() { |
3755 if (do_suspend(_thread->osthread())) { | |
3756 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
3757 do_task(context); | |
3758 do_resume(_thread->osthread()); | |
3759 } | |
3760 } | |
3761 | |
3960 | 3762 /// |
10405 | 3763 class PcFetcher : public os::SuspendedThreadTask { |
3764 public: | |
3765 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
3766 ExtendedPC result(); | |
3767 protected: | |
3768 void do_task(const os::SuspendedThreadTaskContext& context); | |
3769 private: | |
3770 ExtendedPC _epc; | |
3771 }; | |
3772 | |
3773 ExtendedPC PcFetcher::result() { | |
3774 guarantee(is_done(), "task is not done yet."); | |
3775 return _epc; | |
3776 } | |
3777 | |
3778 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
3779 Thread* thread = context.thread(); | |
3780 OSThread* osthread = thread->osthread(); | |
3781 if (osthread->ucontext() != NULL) { | |
3782 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
3783 } else { | |
3784 // NULL context is unexpected, double-check this is the VMThread | |
3785 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
3786 } | |
3787 } | |
3960 | 3788 |
3789 // Suspends the target using the signal mechanism and then grabs the PC before | |
3790 // resuming the target. Used by the flat-profiler only | |
3791 ExtendedPC os::get_thread_pc(Thread* thread) { | |
3792 // Make sure that it is called by the watcher for the VMThread | |
3793 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
3794 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
3795 | |
10405 | 3796 PcFetcher fetcher(thread); |
3797 fetcher.run(); | |
3798 return fetcher.result(); | |
3960 | 3799 } |
3800 | |
3801 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
3802 { | |
3803 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
3804 } | |
3805 | |
3806 //////////////////////////////////////////////////////////////////////////////// | |
3807 // debug support | |
3808 | |
3809 bool os::find(address addr, outputStream* st) { | |
3810 Dl_info dlinfo; | |
3811 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
|
3812 if (dladdr(addr, &dlinfo) != 0) { |
3960 | 3813 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
|
3814 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
3960 | 3815 st->print("%s+%#x", dlinfo.dli_sname, |
3816 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
|
3817 } else if (dlinfo.dli_fbase != NULL) { |
3960 | 3818 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
3819 } else { | |
3820 st->print("<absolute address>"); | |
3821 } | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3822 if (dlinfo.dli_fname != NULL) { |
3960 | 3823 st->print(" in %s", dlinfo.dli_fname); |
3824 } | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3825 if (dlinfo.dli_fbase != NULL) { |
3960 | 3826 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
3827 } | |
3828 st->cr(); | |
3829 | |
3830 if (Verbose) { | |
3831 // decode some bytes around the PC | |
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
3832 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
3833 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
3960 | 3834 address lowest = (address) dlinfo.dli_sname; |
3835 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
3836 if (begin < lowest) begin = lowest; | |
3837 Dl_info dlinfo2; | |
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3838 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
3960 | 3839 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
3840 end = (address) dlinfo2.dli_saddr; | |
3841 Disassembler::decode(begin, end, st); | |
3842 } | |
3843 return true; | |
3844 } | |
3845 return false; | |
3846 } | |
3847 | |
3848 //////////////////////////////////////////////////////////////////////////////// | |
3849 // misc | |
3850 | |
3851 // This does not do anything on Bsd. This is basically a hook for being | |
3852 // able to use structured exception handling (thread-local exception filters) | |
3853 // on, e.g., Win32. | |
3854 void | |
3855 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
3856 JavaCallArguments* args, Thread* thread) { | |
3857 f(value, method, args, thread); | |
3858 } | |
3859 | |
3860 void os::print_statistics() { | |
3861 } | |
3862 | |
3863 int os::message_box(const char* title, const char* message) { | |
3864 int i; | |
3865 fdStream err(defaultStream::error_fd()); | |
3866 for (i = 0; i < 78; i++) err.print_raw("="); | |
3867 err.cr(); | |
3868 err.print_raw_cr(title); | |
3869 for (i = 0; i < 78; i++) err.print_raw("-"); | |
3870 err.cr(); | |
3871 err.print_raw_cr(message); | |
3872 for (i = 0; i < 78; i++) err.print_raw("="); | |
3873 err.cr(); | |
3874 | |
3875 char buf[16]; | |
3876 // Prevent process from exiting upon "read error" without consuming all CPU | |
3877 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
3878 | |
3879 return buf[0] == 'y' || buf[0] == 'Y'; | |
3880 } | |
3881 | |
3882 int os::stat(const char *path, struct stat *sbuf) { | |
3883 char pathbuf[MAX_PATH]; | |
3884 if (strlen(path) > MAX_PATH - 1) { | |
3885 errno = ENAMETOOLONG; | |
3886 return -1; | |
3887 } | |
3888 os::native_path(strcpy(pathbuf, path)); | |
3889 return ::stat(pathbuf, sbuf); | |
3890 } | |
3891 | |
3892 bool os::check_heap(bool force) { | |
3893 return true; | |
3894 } | |
3895 | |
3896 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
3897 return ::vsnprintf(buf, count, format, args); | |
3898 } | |
3899 | |
3900 // Is a (classpath) directory empty? | |
3901 bool os::dir_is_empty(const char* path) { | |
3902 DIR *dir = NULL; | |
3903 struct dirent *ptr; | |
3904 | |
3905 dir = opendir(path); | |
3906 if (dir == NULL) return true; | |
3907 | |
3908 /* Scan the directory */ | |
3909 bool result = true; | |
3910 char buf[sizeof(struct dirent) + MAX_PATH]; | |
3911 while (result && (ptr = ::readdir(dir)) != NULL) { | |
3912 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
3913 result = false; | |
3914 } | |
3915 } | |
3916 closedir(dir); | |
3917 return result; | |
3918 } | |
3919 | |
3920 // This code originates from JDK's sysOpen and open64_w | |
3921 // from src/solaris/hpi/src/system_md.c | |
3922 | |
3923 #ifndef O_DELETE | |
3924 #define O_DELETE 0x10000 | |
3925 #endif | |
3926 | |
3927 // Open a file. Unlink the file immediately after open returns | |
3928 // if the specified oflag has the O_DELETE flag set. | |
3929 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
3930 | |
3931 int os::open(const char *path, int oflag, int mode) { | |
3932 | |
3933 if (strlen(path) > MAX_PATH - 1) { | |
3934 errno = ENAMETOOLONG; | |
3935 return -1; | |
3936 } | |
3937 int fd; | |
3938 int o_delete = (oflag & O_DELETE); | |
3939 oflag = oflag & ~O_DELETE; | |
3940 | |
3941 fd = ::open(path, oflag, mode); | |
3942 if (fd == -1) return -1; | |
3943 | |
3944 //If the open succeeded, the file might still be a directory | |
3945 { | |
3946 struct stat buf; | |
3947 int ret = ::fstat(fd, &buf); | |
3948 int st_mode = buf.st_mode; | |
3949 | |
3950 if (ret != -1) { | |
3951 if ((st_mode & S_IFMT) == S_IFDIR) { | |
3952 errno = EISDIR; | |
3953 ::close(fd); | |
3954 return -1; | |
3955 } | |
3956 } else { | |
3957 ::close(fd); | |
3958 return -1; | |
3959 } | |
3960 } | |
3961 | |
3962 /* | |
3963 * All file descriptors that are opened in the JVM and not | |
3964 * specifically destined for a subprocess should have the | |
3965 * close-on-exec flag set. If we don't set it, then careless 3rd | |
3966 * party native code might fork and exec without closing all | |
3967 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
3968 * UNIXProcess.c), and this in turn might: | |
3969 * | |
3970 * - cause end-of-file to fail to be detected on some file | |
3971 * descriptors, resulting in mysterious hangs, or | |
3972 * | |
3973 * - might cause an fopen in the subprocess to fail on a system | |
3974 * suffering from bug 1085341. | |
3975 * | |
3976 * (Yes, the default setting of the close-on-exec flag is a Unix | |
3977 * design flaw) | |
3978 * | |
3979 * See: | |
3980 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
3981 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
3982 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
3983 */ | |
3984 #ifdef FD_CLOEXEC | |
3985 { | |
3986 int flags = ::fcntl(fd, F_GETFD); | |
3987 if (flags != -1) | |
3988 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
3989 } | |
3990 #endif | |
3991 | |
3992 if (o_delete != 0) { | |
3993 ::unlink(path); | |
3994 } | |
3995 return fd; | |
3996 } | |
3997 | |
3998 | |
3999 // create binary file, rewriting existing file if required | |
4000 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
4001 int oflags = O_WRONLY | O_CREAT; | |
4002 if (!rewrite_existing) { | |
4003 oflags |= O_EXCL; | |
4004 } | |
4005 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
4006 } | |
4007 | |
4008 // return current position of file pointer | |
4009 jlong os::current_file_offset(int fd) { | |
4010 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
4011 } | |
4012 | |
4013 // move file pointer to the specified offset | |
4014 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
4015 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
4016 } | |
4017 | |
4018 // This code originates from JDK's sysAvailable | |
4019 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
4020 | |
4021 int os::available(int fd, jlong *bytes) { | |
4022 jlong cur, end; | |
4023 int mode; | |
4024 struct stat buf; | |
4025 | |
4026 if (::fstat(fd, &buf) >= 0) { | |
4027 mode = buf.st_mode; | |
4028 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
4029 /* | |
4030 * XXX: is the following call interruptible? If so, this might | |
4031 * need to go through the INTERRUPT_IO() wrapper as for other | |
4032 * blocking, interruptible calls in this file. | |
4033 */ | |
4034 int n; | |
4035 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
4036 *bytes = n; | |
4037 return 1; | |
4038 } | |
4039 } | |
4040 } | |
4041 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
4042 return 0; | |
4043 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
4044 return 0; | |
4045 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
4046 return 0; | |
4047 } | |
4048 *bytes = end - cur; | |
4049 return 1; | |
4050 } | |
4051 | |
4052 int os::socket_available(int fd, jint *pbytes) { | |
4053 if (fd < 0) | |
4054 return OS_OK; | |
4055 | |
4056 int ret; | |
4057 | |
4058 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
4059 | |
4060 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
4061 // is expected to return 0 on failure and 1 on success to the jdk. | |
4062 | |
4063 return (ret == OS_ERR) ? 0 : 1; | |
4064 } | |
4065 | |
4066 // Map a block of memory. | |
6197 | 4067 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 4068 char *addr, size_t bytes, bool read_only, |
4069 bool allow_exec) { | |
4070 int prot; | |
4071 int flags; | |
4072 | |
4073 if (read_only) { | |
4074 prot = PROT_READ; | |
4075 flags = MAP_SHARED; | |
4076 } else { | |
4077 prot = PROT_READ | PROT_WRITE; | |
4078 flags = MAP_PRIVATE; | |
4079 } | |
4080 | |
4081 if (allow_exec) { | |
4082 prot |= PROT_EXEC; | |
4083 } | |
4084 | |
4085 if (addr != NULL) { | |
4086 flags |= MAP_FIXED; | |
4087 } | |
4088 | |
4089 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
4090 fd, file_offset); | |
4091 if (mapped_address == MAP_FAILED) { | |
4092 return NULL; | |
4093 } | |
4094 return mapped_address; | |
4095 } | |
4096 | |
4097 | |
4098 // Remap a block of memory. | |
6197 | 4099 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
3960 | 4100 char *addr, size_t bytes, bool read_only, |
4101 bool allow_exec) { | |
4102 // same as map_memory() on this OS | |
4103 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
4104 allow_exec); | |
4105 } | |
4106 | |
4107 | |
4108 // Unmap a block of memory. | |
6197 | 4109 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
3960 | 4110 return munmap(addr, bytes) == 0; |
4111 } | |
4112 | |
4113 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
4114 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
4115 // of a thread. | |
4116 // | |
4117 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
4118 // the fast estimate available on the platform. | |
4119 | |
4120 jlong os::current_thread_cpu_time() { | |
4121 #ifdef __APPLE__ | |
4122 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
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4123 #else |
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4124 Unimplemented(); |
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4125 return 0; |
3960 | 4126 #endif |
4127 } | |
4128 | |
4129 jlong os::thread_cpu_time(Thread* thread) { | |
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4130 #ifdef __APPLE__ |
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4131 return os::thread_cpu_time(thread, true /* user + sys */); |
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4132 #else |
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4133 Unimplemented(); |
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4134 return 0; |
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4135 #endif |
3960 | 4136 } |
4137 | |
4138 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
4139 #ifdef __APPLE__ | |
4140 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
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4141 #else |
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4142 Unimplemented(); |
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4143 return 0; |
3960 | 4144 #endif |
4145 } | |
4146 | |
4147 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
4148 #ifdef __APPLE__ | |
4149 struct thread_basic_info tinfo; | |
4150 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
4151 kern_return_t kr; | |
4961
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4152 thread_t mach_thread; |
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4153 |
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4154 mach_thread = thread->osthread()->thread_id(); |
3960 | 4155 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
4156 if (kr != KERN_SUCCESS) | |
4157 return -1; | |
4158 | |
4159 if (user_sys_cpu_time) { | |
4160 jlong nanos; | |
4161 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
4162 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
4163 return nanos; | |
4164 } else { | |
4165 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
4166 } | |
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4167 #else |
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4168 Unimplemented(); |
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4169 return 0; |
3960 | 4170 #endif |
4171 } | |
4172 | |
4173 | |
4174 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4175 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4176 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4177 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4178 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4179 } | |
4180 | |
4181 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
4182 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
4183 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
4184 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
4185 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
4186 } | |
4187 | |
4188 bool os::is_thread_cpu_time_supported() { | |
4189 #ifdef __APPLE__ | |
4190 return true; | |
6918 | 4191 #else |
3960 | 4192 return false; |
4193 #endif | |
4194 } | |
4195 | |
4196 // System loadavg support. Returns -1 if load average cannot be obtained. | |
4197 // Bsd doesn't yet have a (official) notion of processor sets, | |
4198 // so just return the system wide load average. | |
4199 int os::loadavg(double loadavg[], int nelem) { | |
4200 return ::getloadavg(loadavg, nelem); | |
4201 } | |
4202 | |
4203 void os::pause() { | |
4204 char filename[MAX_PATH]; | |
4205 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
4206 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
4207 } else { | |
4208 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
4209 } | |
4210 | |
4211 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
4212 if (fd != -1) { | |
4213 struct stat buf; | |
4214 ::close(fd); | |
4215 while (::stat(filename, &buf) == 0) { | |
4216 (void)::poll(NULL, 0, 100); | |
4217 } | |
4218 } else { | |
4219 jio_fprintf(stderr, | |
4220 "Could not open pause file '%s', continuing immediately.\n", filename); | |
4221 } | |
4222 } | |
4223 | |
4224 | |
4225 // Refer to the comments in os_solaris.cpp park-unpark. | |
4226 // | |
4227 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
4228 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
4229 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
4230 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
4231 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
4232 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
4233 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
4234 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
4235 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
4236 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
4237 // of libpthread avoids the problem, but isn't practical. | |
4238 // | |
4239 // Possible remedies: | |
4240 // | |
4241 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
4242 // This is palliative and probabilistic, however. If the thread is preempted | |
4243 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
4244 // than the minimum period may have passed, and the abstime may be stale (in the | |
4245 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
4246 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
4247 // | |
4248 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
4249 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
4250 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
4251 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
4252 // thread. | |
4253 // | |
4254 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
4255 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
4256 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
4257 // This also works well. In fact it avoids kernel-level scalability impediments | |
4258 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
4259 // timers in a graceful fashion. | |
4260 // | |
4261 // 4. When the abstime value is in the past it appears that control returns | |
4262 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
4263 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
4264 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
4265 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
4266 // It may be possible to avoid reinitialization by checking the return | |
4267 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
4268 // condvar we must establish the invariant that cond_signal() is only called | |
4269 // within critical sections protected by the adjunct mutex. This prevents | |
4270 // cond_signal() from "seeing" a condvar that's in the midst of being | |
4271 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
4272 // desirable signal-after-unlock optimization that avoids futile context switching. | |
4273 // | |
4274 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
4275 // structure when a condvar is used or initialized. cond_destroy() would | |
4276 // release the helper structure. Our reinitialize-after-timedwait fix | |
4277 // put excessive stress on malloc/free and locks protecting the c-heap. | |
4278 // | |
4279 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
4280 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
4281 // and only enabling the work-around for vulnerable environments. | |
4282 | |
4283 // utility to compute the abstime argument to timedwait: | |
4284 // millis is the relative timeout time | |
4285 // abstime will be the absolute timeout time | |
4286 // TODO: replace compute_abstime() with unpackTime() | |
4287 | |
4288 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
4289 if (millis < 0) millis = 0; | |
4290 struct timeval now; | |
4291 int status = gettimeofday(&now, NULL); | |
4292 assert(status == 0, "gettimeofday"); | |
4293 jlong seconds = millis / 1000; | |
4294 millis %= 1000; | |
4295 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
4296 seconds = 50000000; | |
4297 } | |
4298 abstime->tv_sec = now.tv_sec + seconds; | |
4299 long usec = now.tv_usec + millis * 1000; | |
4300 if (usec >= 1000000) { | |
4301 abstime->tv_sec += 1; | |
4302 usec -= 1000000; | |
4303 } | |
4304 abstime->tv_nsec = usec * 1000; | |
4305 return abstime; | |
4306 } | |
4307 | |
4308 | |
4309 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
4310 // Conceptually TryPark() should be equivalent to park(0). | |
4311 | |
4312 int os::PlatformEvent::TryPark() { | |
4313 for (;;) { | |
4314 const int v = _Event ; | |
4315 guarantee ((v == 0) || (v == 1), "invariant") ; | |
4316 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
4317 } | |
4318 } | |
4319 | |
4320 void os::PlatformEvent::park() { // AKA "down()" | |
4321 // Invariant: Only the thread associated with the Event/PlatformEvent | |
4322 // may call park(). | |
4323 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
4324 int v ; | |
4325 for (;;) { | |
4326 v = _Event ; | |
4327 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4328 } | |
4329 guarantee (v >= 0, "invariant") ; | |
4330 if (v == 0) { | |
4331 // Do this the hard way by blocking ... | |
4332 int status = pthread_mutex_lock(_mutex); | |
4333 assert_status(status == 0, status, "mutex_lock"); | |
4334 guarantee (_nParked == 0, "invariant") ; | |
4335 ++ _nParked ; | |
4336 while (_Event < 0) { | |
4337 status = pthread_cond_wait(_cond, _mutex); | |
4338 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
4339 // Treat this the same as if the wait was interrupted | |
4340 if (status == ETIMEDOUT) { status = EINTR; } | |
4341 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
4342 } | |
4343 -- _nParked ; | |
4344 | |
4345 _Event = 0 ; | |
4346 status = pthread_mutex_unlock(_mutex); | |
4347 assert_status(status == 0, status, "mutex_unlock"); | |
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4348 // Paranoia to ensure our locked and lock-free paths interact |
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4349 // correctly with each other. |
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4350 OrderAccess::fence(); |
3960 | 4351 } |
4352 guarantee (_Event >= 0, "invariant") ; | |
4353 } | |
4354 | |
4355 int os::PlatformEvent::park(jlong millis) { | |
4356 guarantee (_nParked == 0, "invariant") ; | |
4357 | |
4358 int v ; | |
4359 for (;;) { | |
4360 v = _Event ; | |
4361 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
4362 } | |
4363 guarantee (v >= 0, "invariant") ; | |
4364 if (v != 0) return OS_OK ; | |
4365 | |
4366 // We do this the hard way, by blocking the thread. | |
4367 // Consider enforcing a minimum timeout value. | |
4368 struct timespec abst; | |
4369 compute_abstime(&abst, millis); | |
4370 | |
4371 int ret = OS_TIMEOUT; | |
4372 int status = pthread_mutex_lock(_mutex); | |
4373 assert_status(status == 0, status, "mutex_lock"); | |
4374 guarantee (_nParked == 0, "invariant") ; | |
4375 ++_nParked ; | |
4376 | |
4377 // Object.wait(timo) will return because of | |
4378 // (a) notification | |
4379 // (b) timeout | |
4380 // (c) thread.interrupt | |
4381 // | |
4382 // Thread.interrupt and object.notify{All} both call Event::set. | |
4383 // That is, we treat thread.interrupt as a special case of notification. | |
4384 // The underlying Solaris implementation, cond_timedwait, admits | |
4385 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
4386 // JVM from making those visible to Java code. As such, we must | |
4387 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
4388 // | |
4389 // TODO: properly differentiate simultaneous notify+interrupt. | |
4390 // In that case, we should propagate the notify to another waiter. | |
4391 | |
4392 while (_Event < 0) { | |
4393 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
4394 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4395 pthread_cond_destroy (_cond); | |
4396 pthread_cond_init (_cond, NULL) ; | |
4397 } | |
4398 assert_status(status == 0 || status == EINTR || | |
4399 status == ETIMEDOUT, | |
4400 status, "cond_timedwait"); | |
4401 if (!FilterSpuriousWakeups) break ; // previous semantics | |
4402 if (status == ETIMEDOUT) break ; | |
4403 // We consume and ignore EINTR and spurious wakeups. | |
4404 } | |
4405 --_nParked ; | |
4406 if (_Event >= 0) { | |
4407 ret = OS_OK; | |
4408 } | |
4409 _Event = 0 ; | |
4410 status = pthread_mutex_unlock(_mutex); | |
4411 assert_status(status == 0, status, "mutex_unlock"); | |
4412 assert (_nParked == 0, "invariant") ; | |
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4413 // Paranoia to ensure our locked and lock-free paths interact |
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4414 // correctly with each other. |
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4415 OrderAccess::fence(); |
3960 | 4416 return ret; |
4417 } | |
4418 | |
4419 void os::PlatformEvent::unpark() { | |
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4420 // Transitions for _Event: |
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4421 // 0 :=> 1 |
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4422 // 1 :=> 1 |
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4423 // -1 :=> either 0 or 1; must signal target thread |
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4424 // That is, we can safely transition _Event from -1 to either |
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4425 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4426 // unpark() calls. |
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4427 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4428 // |
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4429 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4430 // that it will take two back-to-back park() calls for the owning |
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4431 // thread to block. This has the benefit of forcing a spurious return |
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4432 // from the first park() call after an unpark() call which will help |
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4433 // shake out uses of park() and unpark() without condition variables. |
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4434 |
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4435 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4436 |
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4437 // Wait for the thread associated with the event to vacate |
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4438 int status = pthread_mutex_lock(_mutex); |
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4439 assert_status(status == 0, status, "mutex_lock"); |
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4440 int AnyWaiters = _nParked; |
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4441 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4442 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4443 AnyWaiters = 0; |
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4444 pthread_cond_signal(_cond); |
3960 | 4445 } |
7629
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4446 status = pthread_mutex_unlock(_mutex); |
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4447 assert_status(status == 0, status, "mutex_unlock"); |
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4448 if (AnyWaiters != 0) { |
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4449 status = pthread_cond_signal(_cond); |
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4450 assert_status(status == 0, status, "cond_signal"); |
3960 | 4451 } |
4452 | |
4453 // Note that we signal() _after dropping the lock for "immortal" Events. | |
4454 // This is safe and avoids a common class of futile wakeups. In rare | |
4455 // circumstances this can cause a thread to return prematurely from | |
4456 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
4457 // simply re-test the condition and re-park itself. | |
4458 } | |
4459 | |
4460 | |
4461 // JSR166 | |
4462 // ------------------------------------------------------- | |
4463 | |
4464 /* | |
4465 * The solaris and bsd implementations of park/unpark are fairly | |
4466 * conservative for now, but can be improved. They currently use a | |
4467 * mutex/condvar pair, plus a a count. | |
4468 * Park decrements count if > 0, else does a condvar wait. Unpark | |
4469 * sets count to 1 and signals condvar. Only one thread ever waits | |
4470 * on the condvar. Contention seen when trying to park implies that someone | |
4471 * is unparking you, so don't wait. And spurious returns are fine, so there | |
4472 * is no need to track notifications. | |
4473 */ | |
4474 | |
4475 #define MAX_SECS 100000000 | |
4476 /* | |
4477 * This code is common to bsd and solaris and will be moved to a | |
4478 * common place in dolphin. | |
4479 * | |
4480 * The passed in time value is either a relative time in nanoseconds | |
4481 * or an absolute time in milliseconds. Either way it has to be unpacked | |
4482 * into suitable seconds and nanoseconds components and stored in the | |
4483 * given timespec structure. | |
4484 * Given time is a 64-bit value and the time_t used in the timespec is only | |
4485 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
4486 * overflow if times way in the future are given. Further on Solaris versions | |
4487 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
4488 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
4489 * As it will be 28 years before "now + 100000000" will overflow we can | |
4490 * ignore overflow and just impose a hard-limit on seconds using the value | |
4491 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
4492 * years from "now". | |
4493 */ | |
4494 | |
4495 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
4496 assert (time > 0, "convertTime"); | |
4497 | |
4498 struct timeval now; | |
4499 int status = gettimeofday(&now, NULL); | |
4500 assert(status == 0, "gettimeofday"); | |
4501 | |
4502 time_t max_secs = now.tv_sec + MAX_SECS; | |
4503 | |
4504 if (isAbsolute) { | |
4505 jlong secs = time / 1000; | |
4506 if (secs > max_secs) { | |
4507 absTime->tv_sec = max_secs; | |
4508 } | |
4509 else { | |
4510 absTime->tv_sec = secs; | |
4511 } | |
4512 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
4513 } | |
4514 else { | |
4515 jlong secs = time / NANOSECS_PER_SEC; | |
4516 if (secs >= MAX_SECS) { | |
4517 absTime->tv_sec = max_secs; | |
4518 absTime->tv_nsec = 0; | |
4519 } | |
4520 else { | |
4521 absTime->tv_sec = now.tv_sec + secs; | |
4522 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
4523 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
4524 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
4525 ++absTime->tv_sec; // note: this must be <= max_secs | |
4526 } | |
4527 } | |
4528 } | |
4529 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
4530 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
4531 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
4532 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
4533 } | |
4534 | |
4535 void Parker::park(bool isAbsolute, jlong time) { | |
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4536 // Ideally we'd do something useful while spinning, such |
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4537 // as calling unpackTime(). |
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4538 |
3960 | 4539 // Optional fast-path check: |
4540 // Return immediately if a permit is available. | |
7629
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4541 // We depend on Atomic::xchg() having full barrier semantics |
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4542 // since we are doing a lock-free update to _counter. |
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4543 if (Atomic::xchg(0, &_counter) > 0) return; |
3960 | 4544 |
4545 Thread* thread = Thread::current(); | |
4546 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
4547 JavaThread *jt = (JavaThread *)thread; | |
4548 | |
4549 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
4550 // Check interrupt before trying to wait | |
4551 if (Thread::is_interrupted(thread, false)) { | |
4552 return; | |
4553 } | |
4554 | |
4555 // Next, demultiplex/decode time arguments | |
4556 struct timespec absTime; | |
4557 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
4558 return; | |
4559 } | |
4560 if (time > 0) { | |
4561 unpackTime(&absTime, isAbsolute, time); | |
4562 } | |
4563 | |
4564 | |
4565 // Enter safepoint region | |
4566 // Beware of deadlocks such as 6317397. | |
4567 // The per-thread Parker:: mutex is a classic leaf-lock. | |
4568 // In particular a thread must never block on the Threads_lock while | |
4569 // holding the Parker:: mutex. If safepoints are pending both the | |
4570 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
4571 ThreadBlockInVM tbivm(jt); | |
4572 | |
4573 // Don't wait if cannot get lock since interference arises from | |
4574 // unblocking. Also. check interrupt before trying wait | |
4575 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
4576 return; | |
4577 } | |
4578 | |
4579 int status ; | |
4580 if (_counter > 0) { // no wait needed | |
4581 _counter = 0; | |
4582 status = pthread_mutex_unlock(_mutex); | |
4583 assert (status == 0, "invariant") ; | |
7629
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4584 // Paranoia to ensure our locked and lock-free paths interact |
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4585 // correctly with each other and Java-level accesses. |
3960 | 4586 OrderAccess::fence(); |
4587 return; | |
4588 } | |
4589 | |
4590 #ifdef ASSERT | |
4591 // Don't catch signals while blocked; let the running threads have the signals. | |
4592 // (This allows a debugger to break into the running thread.) | |
4593 sigset_t oldsigs; | |
4594 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
4595 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
4596 #endif | |
4597 | |
4598 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
4599 jt->set_suspend_equivalent(); | |
4600 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
4601 | |
4602 if (time == 0) { | |
4603 status = pthread_cond_wait (_cond, _mutex) ; | |
4604 } else { | |
4605 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
4606 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
4607 pthread_cond_destroy (_cond) ; | |
4608 pthread_cond_init (_cond, NULL); | |
4609 } | |
4610 } | |
4611 assert_status(status == 0 || status == EINTR || | |
4612 status == ETIMEDOUT, | |
4613 status, "cond_timedwait"); | |
4614 | |
4615 #ifdef ASSERT | |
4616 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
4617 #endif | |
4618 | |
4619 _counter = 0 ; | |
4620 status = pthread_mutex_unlock(_mutex) ; | |
4621 assert_status(status == 0, status, "invariant") ; | |
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4622 // Paranoia to ensure our locked and lock-free paths interact |
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4623 // correctly with each other and Java-level accesses. |
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|
4624 OrderAccess::fence(); |
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|
4625 |
3960 | 4626 // If externally suspended while waiting, re-suspend |
4627 if (jt->handle_special_suspend_equivalent_condition()) { | |
4628 jt->java_suspend_self(); | |
4629 } | |
4630 } | |
4631 | |
4632 void Parker::unpark() { | |
4633 int s, status ; | |
4634 status = pthread_mutex_lock(_mutex); | |
4635 assert (status == 0, "invariant") ; | |
4636 s = _counter; | |
4637 _counter = 1; | |
4638 if (s < 1) { | |
4639 if (WorkAroundNPTLTimedWaitHang) { | |
4640 status = pthread_cond_signal (_cond) ; | |
4641 assert (status == 0, "invariant") ; | |
4642 status = pthread_mutex_unlock(_mutex); | |
4643 assert (status == 0, "invariant") ; | |
4644 } else { | |
4645 status = pthread_mutex_unlock(_mutex); | |
4646 assert (status == 0, "invariant") ; | |
4647 status = pthread_cond_signal (_cond) ; | |
4648 assert (status == 0, "invariant") ; | |
4649 } | |
4650 } else { | |
4651 pthread_mutex_unlock(_mutex); | |
4652 assert (status == 0, "invariant") ; | |
4653 } | |
4654 } | |
4655 | |
4656 | |
4657 /* Darwin has no "environ" in a dynamic library. */ | |
4658 #ifdef __APPLE__ | |
4659 #include <crt_externs.h> | |
4660 #define environ (*_NSGetEnviron()) | |
4661 #else | |
4662 extern char** environ; | |
4663 #endif | |
4664 | |
4665 // Run the specified command in a separate process. Return its exit value, | |
4666 // or -1 on failure (e.g. can't fork a new process). | |
4667 // Unlike system(), this function can be called from signal handler. It | |
4668 // doesn't block SIGINT et al. | |
4669 int os::fork_and_exec(char* cmd) { | |
4670 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
4671 | |
4672 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
4673 // pthread_atfork handlers and reset pthread library. All we need is a | |
4674 // separate process to execve. Make a direct syscall to fork process. | |
4675 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
4676 // the best... | |
4677 pid_t pid = fork(); | |
4678 | |
4679 if (pid < 0) { | |
4680 // fork failed | |
4681 return -1; | |
4682 | |
4683 } else if (pid == 0) { | |
4684 // child process | |
4685 | |
4686 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
4687 // first to kill every thread on the thread list. Because this list is | |
4688 // not reset by fork() (see notes above), execve() will instead kill | |
4689 // every thread in the parent process. We know this is the only thread | |
4690 // in the new process, so make a system call directly. | |
4691 // IA64 should use normal execve() from glibc to match the glibc fork() | |
4692 // above. | |
4693 execve("/bin/sh", (char* const*)argv, environ); | |
4694 | |
4695 // execve failed | |
4696 _exit(-1); | |
4697 | |
4698 } else { | |
4699 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
4700 // care about the actual exit code, for now. | |
4701 | |
4702 int status; | |
4703 | |
4704 // Wait for the child process to exit. This returns immediately if | |
4705 // the child has already exited. */ | |
4706 while (waitpid(pid, &status, 0) < 0) { | |
4707 switch (errno) { | |
4708 case ECHILD: return 0; | |
4709 case EINTR: break; | |
4710 default: return -1; | |
4711 } | |
4712 } | |
4713 | |
4714 if (WIFEXITED(status)) { | |
4715 // The child exited normally; get its exit code. | |
4716 return WEXITSTATUS(status); | |
4717 } else if (WIFSIGNALED(status)) { | |
4718 // The child exited because of a signal | |
4719 // The best value to return is 0x80 + signal number, | |
4720 // because that is what all Unix shells do, and because | |
4721 // it allows callers to distinguish between process exit and | |
4722 // process death by signal. | |
4723 return 0x80 + WTERMSIG(status); | |
4724 } else { | |
4725 // Unknown exit code; pass it through | |
4726 return status; | |
4727 } | |
4728 } | |
4729 } | |
4730 | |
4731 // is_headless_jre() | |
4732 // | |
4082
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4733 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
3960 | 4734 // in order to report if we are running in a headless jre |
4735 // | |
4082
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4736 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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4737 // as libawt.so, and renamed libawt_xawt.so |
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|
4738 // |
3960 | 4739 bool os::is_headless_jre() { |
12990 | 4740 #ifdef __APPLE__ |
4741 // We no longer build headless-only on Mac OS X | |
4742 return false; | |
4743 #else | |
3960 | 4744 struct stat statbuf; |
4745 char buf[MAXPATHLEN]; | |
4746 char libmawtpath[MAXPATHLEN]; | |
4006 | 4747 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
5921 | 4748 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
3960 | 4749 char *p; |
4750 | |
4751 // Get path to libjvm.so | |
4752 os::jvm_path(buf, sizeof(buf)); | |
4753 | |
4754 // Get rid of libjvm.so | |
4755 p = strrchr(buf, '/'); | |
4756 if (p == NULL) return false; | |
4757 else *p = '\0'; | |
4758 | |
4759 // Get rid of client or server | |
4760 p = strrchr(buf, '/'); | |
4761 if (p == NULL) return false; | |
4762 else *p = '\0'; | |
4763 | |
4764 // check xawt/libmawt.so | |
4765 strcpy(libmawtpath, buf); | |
4766 strcat(libmawtpath, xawtstr); | |
4767 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
4768 | |
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4769 // check libawt_xawt.so |
3960 | 4770 strcpy(libmawtpath, buf); |
4082
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4771 strcat(libmawtpath, new_xawtstr); |
3960 | 4772 if (::stat(libmawtpath, &statbuf) == 0) return false; |
4773 | |
4774 return true; | |
12990 | 4775 #endif |
3960 | 4776 } |
6200
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4777 |
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4778 // Get the default path to the core file |
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4779 // Returns the length of the string |
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|
4780 int os::get_core_path(char* buffer, size_t bufferSize) { |
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4781 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
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|
4782 |
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4783 // Truncate if theoretical string was longer than bufferSize |
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|
4784 n = MIN2(n, (int)bufferSize); |
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|
4785 |
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|
4786 return n; |
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|
4787 } |
10405 | 4788 |
12110
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
4789 #ifndef PRODUCT |
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|
4790 void TestReserveMemorySpecial_test() { |
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8007074: SIGSEGV at ParMarkBitMap::verify_clear()
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|
4791 // No tests available for this platform |
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|
4792 } |
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4793 #endif |