Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 10405:f2110083203d
8005849: JEP 167: Event-Based JVM Tracing
Reviewed-by: acorn, coleenp, sla
Contributed-by: Karen Kinnear <karen.kinnear@oracle.com>, Bengt Rutisson <bengt.rutisson@oracle.com>, Calvin Cheung <calvin.cheung@oracle.com>, Erik Gahlin <erik.gahlin@oracle.com>, Erik Helin <erik.helin@oracle.com>, Jesper Wilhelmsson <jesper.wilhelmsson@oracle.com>, Keith McGuigan <keith.mcguigan@oracle.com>, Mattias Tobiasson <mattias.tobiasson@oracle.com>, Markus Gronlund <markus.gronlund@oracle.com>, Mikael Auno <mikael.auno@oracle.com>, Nils Eliasson <nils.eliasson@oracle.com>, Nils Loodin <nils.loodin@oracle.com>, Rickard Backman <rickard.backman@oracle.com>, Staffan Larsen <staffan.larsen@oracle.com>, Stefan Karlsson <stefan.karlsson@oracle.com>, Yekaterina Kantserova <yekaterina.kantserova@oracle.com>
| author | sla |
|---|---|
| date | Mon, 10 Jun 2013 11:30:51 +0200 |
| parents | ef1818846c22 |
| children | 836a62f43af9 a837fa3d3f86 b5c8a61d7fa0 |
| rev | line source |
|---|---|
| 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> | |
| 103 | |
| 104 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
| 105 # include <elf.h> | |
| 106 #endif | |
| 107 | |
| 108 #ifdef __APPLE__ | |
| 4006 | 109 # include <mach/mach.h> // semaphore_* API |
| 110 # include <mach-o/dyld.h> | |
| 111 # include <sys/proc_info.h> | |
| 112 # include <objc/objc-auto.h> | |
| 3960 | 113 #endif |
| 114 | |
| 115 #ifndef MAP_ANONYMOUS | |
| 116 #define MAP_ANONYMOUS MAP_ANON | |
| 117 #endif | |
| 118 | |
| 119 #define MAX_PATH (2 * K) | |
| 120 | |
| 121 // for timer info max values which include all bits | |
| 122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
| 123 | |
| 124 #define LARGEPAGES_BIT (1 << 6) | |
| 125 //////////////////////////////////////////////////////////////////////////////// | |
| 126 // global variables | |
| 127 julong os::Bsd::_physical_memory = 0; | |
| 128 | |
| 129 | |
| 130 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
| 131 pthread_t os::Bsd::_main_thread; | |
| 132 int os::Bsd::_page_size = -1; | |
| 133 | |
| 134 static jlong initial_time_count=0; | |
| 135 | |
| 136 static int clock_tics_per_sec = 100; | |
| 137 | |
| 138 // For diagnostics to print a message once. see run_periodic_checks | |
| 139 static sigset_t check_signal_done; | |
| 6918 | 140 static bool check_signals = true; |
| 3960 | 141 |
| 142 static pid_t _initial_pid = 0; | |
| 143 | |
| 144 /* Signal number used to suspend/resume a thread */ | |
| 145 | |
| 146 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
| 147 static int SR_signum = SIGUSR2; | |
| 148 sigset_t SR_sigset; | |
| 149 | |
| 150 | |
| 151 //////////////////////////////////////////////////////////////////////////////// | |
| 152 // utility functions | |
| 153 | |
| 154 static int SR_initialize(); | |
| 155 | |
| 156 julong os::available_memory() { | |
| 157 return Bsd::available_memory(); | |
| 158 } | |
| 159 | |
| 160 julong os::Bsd::available_memory() { | |
| 161 // XXXBSD: this is just a stopgap implementation | |
| 162 return physical_memory() >> 2; | |
| 163 } | |
| 164 | |
| 165 julong os::physical_memory() { | |
| 166 return Bsd::physical_memory(); | |
| 167 } | |
| 168 | |
| 169 //////////////////////////////////////////////////////////////////////////////// | |
| 170 // environment support | |
| 171 | |
| 172 bool os::getenv(const char* name, char* buf, int len) { | |
| 173 const char* val = ::getenv(name); | |
| 174 if (val != NULL && strlen(val) < (size_t)len) { | |
| 175 strcpy(buf, val); | |
| 176 return true; | |
| 177 } | |
| 178 if (len > 0) buf[0] = 0; // return a null string | |
| 179 return false; | |
| 180 } | |
| 181 | |
| 182 | |
| 183 // Return true if user is running as root. | |
| 184 | |
| 185 bool os::have_special_privileges() { | |
| 186 static bool init = false; | |
| 187 static bool privileges = false; | |
| 188 if (!init) { | |
| 189 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
| 190 init = true; | |
| 191 } | |
| 192 return privileges; | |
| 193 } | |
| 194 | |
| 195 | |
| 196 | |
| 197 // Cpu architecture string | |
| 198 #if defined(ZERO) | |
| 199 static char cpu_arch[] = ZERO_LIBARCH; | |
| 200 #elif defined(IA64) | |
| 201 static char cpu_arch[] = "ia64"; | |
| 202 #elif defined(IA32) | |
| 203 static char cpu_arch[] = "i386"; | |
| 204 #elif defined(AMD64) | |
| 205 static char cpu_arch[] = "amd64"; | |
| 206 #elif defined(ARM) | |
| 207 static char cpu_arch[] = "arm"; | |
| 208 #elif defined(PPC) | |
| 209 static char cpu_arch[] = "ppc"; | |
| 210 #elif defined(SPARC) | |
| 211 # ifdef _LP64 | |
| 212 static char cpu_arch[] = "sparcv9"; | |
| 213 # else | |
| 214 static char cpu_arch[] = "sparc"; | |
| 215 # endif | |
| 216 #else | |
| 217 #error Add appropriate cpu_arch setting | |
| 218 #endif | |
| 219 | |
| 4846 | 220 // Compiler variant |
| 221 #ifdef COMPILER2 | |
| 222 #define COMPILER_VARIANT "server" | |
| 223 #else | |
| 224 #define COMPILER_VARIANT "client" | |
| 225 #endif | |
| 3960 | 226 |
| 6918 | 227 |
| 3960 | 228 void os::Bsd::initialize_system_info() { |
| 229 int mib[2]; | |
| 230 size_t len; | |
| 231 int cpu_val; | |
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232 julong mem_val; |
| 3960 | 233 |
| 234 /* get processors count via hw.ncpus sysctl */ | |
| 235 mib[0] = CTL_HW; | |
| 236 mib[1] = HW_NCPU; | |
| 237 len = sizeof(cpu_val); | |
| 238 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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239 assert(len == sizeof(cpu_val), "unexpected data size"); |
| 3960 | 240 set_processor_count(cpu_val); |
| 241 } | |
| 242 else { | |
| 243 set_processor_count(1); // fallback | |
| 244 } | |
| 245 | |
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246 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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247 * since it returns a 64 bit value) |
| 3960 | 248 */ |
| 249 mib[0] = CTL_HW; | |
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250 mib[1] = HW_MEMSIZE; |
| 3960 | 251 len = sizeof(mem_val); |
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252 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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253 assert(len == sizeof(mem_val), "unexpected data size"); |
| 3960 | 254 _physical_memory = mem_val; |
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255 } else { |
| 3960 | 256 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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257 } |
| 3960 | 258 |
| 259 #ifdef __OpenBSD__ | |
| 260 { | |
| 261 // limit _physical_memory memory view on OpenBSD since | |
| 262 // datasize rlimit restricts us anyway. | |
| 263 struct rlimit limits; | |
| 264 getrlimit(RLIMIT_DATA, &limits); | |
| 265 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
| 266 } | |
| 267 #endif | |
| 268 } | |
| 269 | |
| 4006 | 270 #ifdef __APPLE__ |
| 271 static const char *get_home() { | |
| 272 const char *home_dir = ::getenv("HOME"); | |
| 273 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
| 274 struct passwd *passwd_info = getpwuid(geteuid()); | |
| 275 if (passwd_info != NULL) { | |
| 276 home_dir = passwd_info->pw_dir; | |
| 277 } | |
| 278 } | |
| 279 | |
| 280 return home_dir; | |
| 281 } | |
| 282 #endif | |
| 283 | |
| 3960 | 284 void os::init_system_properties_values() { |
| 285 // char arch[12]; | |
| 286 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
| 287 | |
| 288 // The next steps are taken in the product version: | |
| 289 // | |
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290 // Obtain the JAVA_HOME value from the location of libjvm.so. |
| 3960 | 291 // This library should be located at: |
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292 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
| 3960 | 293 // |
| 294 // If "/jre/lib/" appears at the right place in the path, then we | |
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295 // assume libjvm.so is installed in a JDK and we use this path. |
| 3960 | 296 // |
| 297 // Otherwise exit with message: "Could not create the Java virtual machine." | |
| 298 // | |
| 299 // The following extra steps are taken in the debugging version: | |
| 300 // | |
| 301 // If "/jre/lib/" does NOT appear at the right place in the path | |
| 302 // instead of exit check for $JAVA_HOME environment variable. | |
| 303 // | |
| 304 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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305 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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306 // it looks like libjvm.so is installed there |
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307 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
| 3960 | 308 // |
| 309 // Otherwise exit. | |
| 310 // | |
| 311 // Important note: if the location of libjvm.so changes this | |
| 312 // code needs to be changed accordingly. | |
| 313 | |
| 314 // The next few definitions allow the code to be verbatim: | |
| 6197 | 315 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
| 3960 | 316 #define getenv(n) ::getenv(n) |
| 317 | |
| 318 /* | |
| 319 * See ld(1): | |
| 320 * The linker uses the following search paths to locate required | |
| 321 * shared libraries: | |
| 322 * 1: ... | |
| 323 * ... | |
| 324 * 7: The default directories, normally /lib and /usr/lib. | |
| 325 */ | |
| 326 #ifndef DEFAULT_LIBPATH | |
| 327 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
| 328 #endif | |
| 329 | |
| 330 #define EXTENSIONS_DIR "/lib/ext" | |
| 331 #define ENDORSED_DIR "/lib/endorsed" | |
| 332 #define REG_DIR "/usr/java/packages" | |
| 333 | |
| 4006 | 334 #ifdef __APPLE__ |
| 335 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
| 336 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
| 337 const char *user_home_dir = get_home(); | |
| 338 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
| 339 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
| 340 sizeof(SYS_EXTENSIONS_DIRS); | |
| 341 #endif | |
| 342 | |
| 3960 | 343 { |
| 344 /* sysclasspath, java_home, dll_dir */ | |
| 345 { | |
| 346 char *home_path; | |
| 347 char *dll_path; | |
| 348 char *pslash; | |
| 349 char buf[MAXPATHLEN]; | |
| 350 os::jvm_path(buf, sizeof(buf)); | |
| 351 | |
| 352 // Found the full path to libjvm.so. | |
| 353 // Now cut the path to <java_home>/jre if we can. | |
| 354 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
| 355 pslash = strrchr(buf, '/'); | |
| 356 if (pslash != NULL) | |
| 357 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
| 358 dll_path = malloc(strlen(buf) + 1); | |
| 359 if (dll_path == NULL) | |
| 360 return; | |
| 361 strcpy(dll_path, buf); | |
| 362 Arguments::set_dll_dir(dll_path); | |
| 363 | |
| 364 if (pslash != NULL) { | |
| 365 pslash = strrchr(buf, '/'); | |
| 366 if (pslash != NULL) { | |
| 4006 | 367 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
| 368 #ifndef __APPLE__ | |
| 3960 | 369 pslash = strrchr(buf, '/'); |
| 370 if (pslash != NULL) | |
| 371 *pslash = '\0'; /* get rid of /lib */ | |
| 4006 | 372 #endif |
| 3960 | 373 } |
| 374 } | |
| 375 | |
| 376 home_path = malloc(strlen(buf) + 1); | |
| 377 if (home_path == NULL) | |
| 378 return; | |
| 379 strcpy(home_path, buf); | |
| 380 Arguments::set_java_home(home_path); | |
| 381 | |
| 382 if (!set_boot_path('/', ':')) | |
| 383 return; | |
| 384 } | |
| 385 | |
| 386 /* | |
| 387 * Where to look for native libraries | |
| 388 * | |
| 389 * Note: Due to a legacy implementation, most of the library path | |
| 390 * is set in the launcher. This was to accomodate linking restrictions | |
| 391 * on legacy Bsd implementations (which are no longer supported). | |
| 392 * Eventually, all the library path setting will be done here. | |
| 393 * | |
| 394 * However, to prevent the proliferation of improperly built native | |
| 395 * libraries, the new path component /usr/java/packages is added here. | |
| 396 * Eventually, all the library path setting will be done here. | |
| 397 */ | |
| 398 { | |
| 399 char *ld_library_path; | |
| 400 | |
| 401 /* | |
| 402 * Construct the invariant part of ld_library_path. Note that the | |
| 403 * space for the colon and the trailing null are provided by the | |
| 404 * nulls included by the sizeof operator (so actually we allocate | |
| 405 * a byte more than necessary). | |
| 406 */ | |
| 4006 | 407 #ifdef __APPLE__ |
| 408 ld_library_path = (char *) malloc(system_ext_size); | |
| 409 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
| 410 #else | |
| 3960 | 411 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
| 412 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
| 413 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
| 4006 | 414 #endif |
| 3960 | 415 |
| 416 /* | |
| 417 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
| 418 * should always exist (until the legacy problem cited above is | |
| 419 * addressed). | |
| 420 */ | |
| 421 #ifdef __APPLE__ | |
| 4006 | 422 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
| 423 char *l = getenv("JAVA_LIBRARY_PATH"); | |
| 424 if (l != NULL) { | |
| 425 char *t = ld_library_path; | |
| 426 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 427 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
| 428 sprintf(ld_library_path, "%s:%s", l, t); | |
| 429 free(t); | |
| 430 } | |
| 431 | |
| 3960 | 432 char *v = getenv("DYLD_LIBRARY_PATH"); |
| 433 #else | |
| 434 char *v = getenv("LD_LIBRARY_PATH"); | |
| 435 #endif | |
| 436 if (v != NULL) { | |
| 437 char *t = ld_library_path; | |
| 438 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 439 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
| 440 sprintf(ld_library_path, "%s:%s", v, t); | |
| 4006 | 441 free(t); |
| 3960 | 442 } |
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443 |
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444 #ifdef __APPLE__ |
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445 // Apple's Java6 has "." at the beginning of java.library.path. |
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446 // OpenJDK on Windows has "." at the end of java.library.path. |
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447 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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448 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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449 // "." is appended to the end of java.library.path. Yes, this |
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450 // could cause a change in behavior, but Apple's Java6 behavior |
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451 // can be achieved by putting "." at the beginning of the |
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452 // JAVA_LIBRARY_PATH environment variable. |
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453 { |
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454 char *t = ld_library_path; |
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455 // that's +3 for appending ":." and the trailing '\0' |
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456 ld_library_path = (char *) malloc(strlen(t) + 3); |
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457 sprintf(ld_library_path, "%s:%s", t, "."); |
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458 free(t); |
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459 } |
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460 #endif |
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461 |
| 3960 | 462 Arguments::set_library_path(ld_library_path); |
| 463 } | |
| 464 | |
| 465 /* | |
| 466 * Extensions directories. | |
| 467 * | |
| 468 * Note that the space for the colon and the trailing null are provided | |
| 469 * by the nulls included by the sizeof operator (so actually one byte more | |
| 470 * than necessary is allocated). | |
| 471 */ | |
| 472 { | |
| 4006 | 473 #ifdef __APPLE__ |
| 474 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
| 475 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
| 476 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
| 477 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
| 478 #else | |
| 3960 | 479 char *buf = malloc(strlen(Arguments::get_java_home()) + |
| 480 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
| 481 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
| 482 Arguments::get_java_home()); | |
| 4006 | 483 #endif |
| 484 | |
| 3960 | 485 Arguments::set_ext_dirs(buf); |
| 486 } | |
| 487 | |
| 488 /* Endorsed standards default directory. */ | |
| 489 { | |
| 490 char * buf; | |
| 491 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
| 492 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
| 493 Arguments::set_endorsed_dirs(buf); | |
| 494 } | |
| 495 } | |
| 496 | |
| 4006 | 497 #ifdef __APPLE__ |
| 498 #undef SYS_EXTENSIONS_DIR | |
| 499 #endif | |
| 3960 | 500 #undef malloc |
| 501 #undef getenv | |
| 502 #undef EXTENSIONS_DIR | |
| 503 #undef ENDORSED_DIR | |
| 504 | |
| 505 // Done | |
| 506 return; | |
| 507 } | |
| 508 | |
| 509 //////////////////////////////////////////////////////////////////////////////// | |
| 510 // breakpoint support | |
| 511 | |
| 512 void os::breakpoint() { | |
| 513 BREAKPOINT; | |
| 514 } | |
| 515 | |
| 516 extern "C" void breakpoint() { | |
| 517 // use debugger to set breakpoint here | |
| 518 } | |
| 519 | |
| 520 //////////////////////////////////////////////////////////////////////////////// | |
| 521 // signal support | |
| 522 | |
| 523 debug_only(static bool signal_sets_initialized = false); | |
| 524 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
| 525 | |
| 526 bool os::Bsd::is_sig_ignored(int sig) { | |
| 527 struct sigaction oact; | |
| 528 sigaction(sig, (struct sigaction*)NULL, &oact); | |
| 529 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
| 530 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
| 531 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
| 532 return true; | |
| 533 else | |
| 534 return false; | |
| 535 } | |
| 536 | |
| 537 void os::Bsd::signal_sets_init() { | |
| 538 // Should also have an assertion stating we are still single-threaded. | |
| 539 assert(!signal_sets_initialized, "Already initialized"); | |
| 540 // Fill in signals that are necessarily unblocked for all threads in | |
| 541 // the VM. Currently, we unblock the following signals: | |
| 542 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
| 543 // by -Xrs (=ReduceSignalUsage)); | |
| 544 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
| 545 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
| 546 // the dispositions or masks wrt these signals. | |
| 547 // Programs embedding the VM that want to use the above signals for their | |
| 548 // own purposes must, at this time, use the "-Xrs" option to prevent | |
| 549 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
| 550 // (See bug 4345157, and other related bugs). | |
| 551 // In reality, though, unblocking these signals is really a nop, since | |
| 552 // these signals are not blocked by default. | |
| 553 sigemptyset(&unblocked_sigs); | |
| 554 sigemptyset(&allowdebug_blocked_sigs); | |
| 555 sigaddset(&unblocked_sigs, SIGILL); | |
| 556 sigaddset(&unblocked_sigs, SIGSEGV); | |
| 557 sigaddset(&unblocked_sigs, SIGBUS); | |
| 558 sigaddset(&unblocked_sigs, SIGFPE); | |
| 559 sigaddset(&unblocked_sigs, SR_signum); | |
| 560 | |
| 561 if (!ReduceSignalUsage) { | |
| 562 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
| 563 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
| 564 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
| 565 } | |
| 566 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
| 567 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
| 568 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
| 569 } | |
| 570 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
| 571 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
| 572 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
| 573 } | |
| 574 } | |
| 575 // Fill in signals that are blocked by all but the VM thread. | |
| 576 sigemptyset(&vm_sigs); | |
| 577 if (!ReduceSignalUsage) | |
| 578 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
| 579 debug_only(signal_sets_initialized = true); | |
| 580 | |
| 581 } | |
| 582 | |
| 583 // These are signals that are unblocked while a thread is running Java. | |
| 584 // (For some reason, they get blocked by default.) | |
| 585 sigset_t* os::Bsd::unblocked_signals() { | |
| 586 assert(signal_sets_initialized, "Not initialized"); | |
| 587 return &unblocked_sigs; | |
| 588 } | |
| 589 | |
| 590 // These are the signals that are blocked while a (non-VM) thread is | |
| 591 // running Java. Only the VM thread handles these signals. | |
| 592 sigset_t* os::Bsd::vm_signals() { | |
| 593 assert(signal_sets_initialized, "Not initialized"); | |
| 594 return &vm_sigs; | |
| 595 } | |
| 596 | |
| 597 // These are signals that are blocked during cond_wait to allow debugger in | |
| 598 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
| 599 assert(signal_sets_initialized, "Not initialized"); | |
| 600 return &allowdebug_blocked_sigs; | |
| 601 } | |
| 602 | |
| 603 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
| 604 | |
| 605 //Save caller's signal mask before setting VM signal mask | |
| 606 sigset_t caller_sigmask; | |
| 607 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
| 608 | |
| 609 OSThread* osthread = thread->osthread(); | |
| 610 osthread->set_caller_sigmask(caller_sigmask); | |
| 611 | |
| 612 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
| 613 | |
| 614 if (!ReduceSignalUsage) { | |
| 615 if (thread->is_VM_thread()) { | |
| 616 // Only the VM thread handles BREAK_SIGNAL ... | |
| 617 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
| 618 } else { | |
| 619 // ... all other threads block BREAK_SIGNAL | |
| 620 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
| 621 } | |
| 622 } | |
| 623 } | |
| 624 | |
| 625 | |
| 626 ////////////////////////////////////////////////////////////////////////////// | |
| 627 // create new thread | |
| 628 | |
| 629 // check if it's safe to start a new thread | |
| 630 static bool _thread_safety_check(Thread* thread) { | |
| 6918 | 631 return true; |
| 3960 | 632 } |
| 633 | |
| 4006 | 634 #ifdef __APPLE__ |
| 635 // library handle for calling objc_registerThreadWithCollector() | |
| 636 // without static linking to the libobjc library | |
| 637 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
| 638 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
| 639 typedef void (*objc_registerThreadWithCollector_t)(); | |
| 640 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
| 641 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
| 642 #endif | |
| 643 | |
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644 #ifdef __APPLE__ |
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645 static uint64_t locate_unique_thread_id() { |
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646 // Additional thread_id used to correlate threads in SA |
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647 thread_identifier_info_data_t m_ident_info; |
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648 mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT; |
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649 |
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650 thread_info(::mach_thread_self(), THREAD_IDENTIFIER_INFO, |
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651 (thread_info_t) &m_ident_info, &count); |
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652 return m_ident_info.thread_id; |
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653 } |
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654 #endif |
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655 |
| 3960 | 656 // Thread start routine for all newly created threads |
| 657 static void *java_start(Thread *thread) { | |
| 658 // Try to randomize the cache line index of hot stack frames. | |
| 659 // This helps when threads of the same stack traces evict each other's | |
| 660 // cache lines. The threads can be either from the same JVM instance, or | |
| 661 // from different JVM instances. The benefit is especially true for | |
| 662 // processors with hyperthreading technology. | |
| 663 static int counter = 0; | |
| 664 int pid = os::current_process_id(); | |
| 665 alloca(((pid ^ counter++) & 7) * 128); | |
| 666 | |
| 667 ThreadLocalStorage::set_thread(thread); | |
| 668 | |
| 669 OSThread* osthread = thread->osthread(); | |
| 670 Monitor* sync = osthread->startThread_lock(); | |
| 671 | |
| 672 // non floating stack BsdThreads needs extra check, see above | |
| 673 if (!_thread_safety_check(thread)) { | |
| 674 // notify parent thread | |
| 675 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 676 osthread->set_state(ZOMBIE); | |
| 677 sync->notify_all(); | |
| 678 return NULL; | |
| 679 } | |
| 680 | |
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681 #ifdef __APPLE__ |
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682 // thread_id is mach thread on macos |
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683 osthread->set_thread_id(::mach_thread_self()); |
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684 osthread->set_unique_thread_id(locate_unique_thread_id()); |
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685 #else |
| 3960 | 686 // thread_id is pthread_id on BSD |
| 687 osthread->set_thread_id(::pthread_self()); | |
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688 #endif |
| 3960 | 689 // initialize signal mask for this thread |
| 690 os::Bsd::hotspot_sigmask(thread); | |
| 691 | |
| 692 // initialize floating point control register | |
| 693 os::Bsd::init_thread_fpu_state(); | |
| 694 | |
| 4006 | 695 #ifdef __APPLE__ |
| 696 // register thread with objc gc | |
| 697 if (objc_registerThreadWithCollectorFunction != NULL) { | |
| 698 objc_registerThreadWithCollectorFunction(); | |
| 699 } | |
| 700 #endif | |
| 701 | |
| 3960 | 702 // handshaking with parent thread |
| 703 { | |
| 704 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 705 | |
| 706 // notify parent thread | |
| 707 osthread->set_state(INITIALIZED); | |
| 708 sync->notify_all(); | |
| 709 | |
| 710 // wait until os::start_thread() | |
| 711 while (osthread->get_state() == INITIALIZED) { | |
| 712 sync->wait(Mutex::_no_safepoint_check_flag); | |
| 713 } | |
| 714 } | |
| 715 | |
| 716 // call one more level start routine | |
| 717 thread->run(); | |
| 718 | |
| 719 return 0; | |
| 720 } | |
| 721 | |
| 722 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 723 assert(thread->osthread() == NULL, "caller responsible"); | |
| 724 | |
| 725 // Allocate the OSThread object | |
| 726 OSThread* osthread = new OSThread(NULL, NULL); | |
| 727 if (osthread == NULL) { | |
| 728 return false; | |
| 729 } | |
| 730 | |
| 731 // set the correct thread state | |
| 732 osthread->set_thread_type(thr_type); | |
| 733 | |
| 734 // Initial state is ALLOCATED but not INITIALIZED | |
| 735 osthread->set_state(ALLOCATED); | |
| 736 | |
| 737 thread->set_osthread(osthread); | |
| 738 | |
| 739 // init thread attributes | |
| 740 pthread_attr_t attr; | |
| 741 pthread_attr_init(&attr); | |
| 742 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
| 743 | |
| 744 // stack size | |
| 745 if (os::Bsd::supports_variable_stack_size()) { | |
| 746 // calculate stack size if it's not specified by caller | |
| 747 if (stack_size == 0) { | |
| 748 stack_size = os::Bsd::default_stack_size(thr_type); | |
| 749 | |
| 750 switch (thr_type) { | |
| 751 case os::java_thread: | |
| 752 // Java threads use ThreadStackSize which default value can be | |
| 753 // changed with the flag -Xss | |
| 754 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
| 755 stack_size = JavaThread::stack_size_at_create(); | |
| 756 break; | |
| 757 case os::compiler_thread: | |
| 758 if (CompilerThreadStackSize > 0) { | |
| 759 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 760 break; | |
| 761 } // else fall through: | |
| 762 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 763 case os::vm_thread: | |
| 764 case os::pgc_thread: | |
| 765 case os::cgc_thread: | |
| 766 case os::watcher_thread: | |
| 767 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 768 break; | |
| 769 } | |
| 770 } | |
| 771 | |
| 772 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
| 773 pthread_attr_setstacksize(&attr, stack_size); | |
| 774 } else { | |
| 775 // let pthread_create() pick the default value. | |
| 776 } | |
| 777 | |
| 778 ThreadState state; | |
| 779 | |
| 780 { | |
| 781 pthread_t tid; | |
| 782 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
| 783 | |
| 784 pthread_attr_destroy(&attr); | |
| 785 | |
| 786 if (ret != 0) { | |
| 787 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 788 perror("pthread_create()"); | |
| 789 } | |
| 790 // Need to clean up stuff we've allocated so far | |
| 791 thread->set_osthread(NULL); | |
| 792 delete osthread; | |
| 793 return false; | |
| 794 } | |
| 795 | |
| 796 // Store pthread info into the OSThread | |
| 797 osthread->set_pthread_id(tid); | |
| 798 | |
| 799 // Wait until child thread is either initialized or aborted | |
| 800 { | |
| 801 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 802 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 803 while ((state = osthread->get_state()) == ALLOCATED) { | |
| 804 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
| 805 } | |
| 806 } | |
| 807 | |
| 808 } | |
| 809 | |
| 810 // Aborted due to thread limit being reached | |
| 811 if (state == ZOMBIE) { | |
| 812 thread->set_osthread(NULL); | |
| 813 delete osthread; | |
| 814 return false; | |
| 815 } | |
| 816 | |
| 817 // The thread is returned suspended (in state INITIALIZED), | |
| 818 // and is started higher up in the call chain | |
| 819 assert(state == INITIALIZED, "race condition"); | |
| 820 return true; | |
| 821 } | |
| 822 | |
| 823 ///////////////////////////////////////////////////////////////////////////// | |
| 824 // attach existing thread | |
| 825 | |
| 826 // bootstrap the main thread | |
| 827 bool os::create_main_thread(JavaThread* thread) { | |
| 828 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
| 829 return create_attached_thread(thread); | |
| 830 } | |
| 831 | |
| 832 bool os::create_attached_thread(JavaThread* thread) { | |
| 833 #ifdef ASSERT | |
| 834 thread->verify_not_published(); | |
| 835 #endif | |
| 836 | |
| 837 // Allocate the OSThread object | |
| 838 OSThread* osthread = new OSThread(NULL, NULL); | |
| 839 | |
| 840 if (osthread == NULL) { | |
| 841 return false; | |
| 842 } | |
| 843 | |
| 844 // Store pthread info into the OSThread | |
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845 #ifdef __APPLE__ |
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846 osthread->set_thread_id(::mach_thread_self()); |
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847 osthread->set_unique_thread_id(locate_unique_thread_id()); |
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848 #else |
| 3960 | 849 osthread->set_thread_id(::pthread_self()); |
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850 #endif |
| 3960 | 851 osthread->set_pthread_id(::pthread_self()); |
| 852 | |
| 853 // initialize floating point control register | |
| 854 os::Bsd::init_thread_fpu_state(); | |
| 855 | |
| 856 // Initial thread state is RUNNABLE | |
| 857 osthread->set_state(RUNNABLE); | |
| 858 | |
| 859 thread->set_osthread(osthread); | |
| 860 | |
| 861 // initialize signal mask for this thread | |
| 862 // and save the caller's signal mask | |
| 863 os::Bsd::hotspot_sigmask(thread); | |
| 864 | |
| 865 return true; | |
| 866 } | |
| 867 | |
| 868 void os::pd_start_thread(Thread* thread) { | |
| 869 OSThread * osthread = thread->osthread(); | |
| 870 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
| 871 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 872 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 873 sync_with_child->notify(); | |
| 874 } | |
| 875 | |
| 876 // Free Bsd resources related to the OSThread | |
| 877 void os::free_thread(OSThread* osthread) { | |
| 878 assert(osthread != NULL, "osthread not set"); | |
| 879 | |
| 880 if (Thread::current()->osthread() == osthread) { | |
| 881 // Restore caller's signal mask | |
| 882 sigset_t sigmask = osthread->caller_sigmask(); | |
| 883 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
| 884 } | |
| 885 | |
| 886 delete osthread; | |
| 887 } | |
| 888 | |
| 889 ////////////////////////////////////////////////////////////////////////////// | |
| 890 // thread local storage | |
| 891 | |
| 892 int os::allocate_thread_local_storage() { | |
| 893 pthread_key_t key; | |
| 894 int rslt = pthread_key_create(&key, NULL); | |
| 895 assert(rslt == 0, "cannot allocate thread local storage"); | |
| 896 return (int)key; | |
| 897 } | |
| 898 | |
| 899 // Note: This is currently not used by VM, as we don't destroy TLS key | |
| 900 // on VM exit. | |
| 901 void os::free_thread_local_storage(int index) { | |
| 902 int rslt = pthread_key_delete((pthread_key_t)index); | |
| 903 assert(rslt == 0, "invalid index"); | |
| 904 } | |
| 905 | |
| 906 void os::thread_local_storage_at_put(int index, void* value) { | |
| 907 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
| 908 assert(rslt == 0, "pthread_setspecific failed"); | |
| 909 } | |
| 910 | |
| 911 extern "C" Thread* get_thread() { | |
| 912 return ThreadLocalStorage::thread(); | |
| 913 } | |
| 914 | |
| 915 | |
| 916 //////////////////////////////////////////////////////////////////////////////// | |
| 917 // time support | |
| 918 | |
| 919 // Time since start-up in seconds to a fine granularity. | |
| 920 // Used by VMSelfDestructTimer and the MemProfiler. | |
| 921 double os::elapsedTime() { | |
| 922 | |
| 923 return (double)(os::elapsed_counter()) * 0.000001; | |
| 924 } | |
| 925 | |
| 926 jlong os::elapsed_counter() { | |
| 927 timeval time; | |
| 928 int status = gettimeofday(&time, NULL); | |
| 929 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
| 930 } | |
| 931 | |
| 932 jlong os::elapsed_frequency() { | |
| 933 return (1000 * 1000); | |
| 934 } | |
| 935 | |
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936 bool os::supports_vtime() { return true; } |
| 3960 | 937 bool os::enable_vtime() { return false; } |
| 938 bool os::vtime_enabled() { return false; } | |
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939 |
| 3960 | 940 double os::elapsedVTime() { |
| 941 // better than nothing, but not much | |
| 942 return elapsedTime(); | |
| 943 } | |
| 944 | |
| 945 jlong os::javaTimeMillis() { | |
| 946 timeval time; | |
| 947 int status = gettimeofday(&time, NULL); | |
| 948 assert(status != -1, "bsd error"); | |
| 949 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
| 950 } | |
| 951 | |
| 952 #ifndef CLOCK_MONOTONIC | |
| 953 #define CLOCK_MONOTONIC (1) | |
| 954 #endif | |
| 955 | |
| 956 #ifdef __APPLE__ | |
| 957 void os::Bsd::clock_init() { | |
| 958 // XXXDARWIN: Investigate replacement monotonic clock | |
| 959 } | |
| 6918 | 960 #else |
| 3960 | 961 void os::Bsd::clock_init() { |
| 962 struct timespec res; | |
| 963 struct timespec tp; | |
| 964 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
| 965 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
| 966 // yes, monotonic clock is supported | |
| 967 _clock_gettime = ::clock_gettime; | |
| 968 } | |
| 969 } | |
| 970 #endif | |
| 971 | |
| 972 | |
| 973 jlong os::javaTimeNanos() { | |
| 974 if (Bsd::supports_monotonic_clock()) { | |
| 975 struct timespec tp; | |
| 976 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
| 977 assert(status == 0, "gettime error"); | |
| 978 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
| 979 return result; | |
| 980 } else { | |
| 981 timeval time; | |
| 982 int status = gettimeofday(&time, NULL); | |
| 983 assert(status != -1, "bsd error"); | |
| 984 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
| 985 return 1000 * usecs; | |
| 986 } | |
| 987 } | |
| 988 | |
| 989 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 990 if (Bsd::supports_monotonic_clock()) { | |
| 991 info_ptr->max_value = ALL_64_BITS; | |
| 992 | |
| 993 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
| 994 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
| 995 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
| 996 } else { | |
| 997 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
| 998 info_ptr->max_value = ALL_64_BITS; | |
| 999 | |
| 1000 // gettimeofday is a real time clock so it skips | |
| 1001 info_ptr->may_skip_backward = true; | |
| 1002 info_ptr->may_skip_forward = true; | |
| 1003 } | |
| 1004 | |
| 1005 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 1006 } | |
| 1007 | |
| 1008 // Return the real, user, and system times in seconds from an | |
| 1009 // arbitrary fixed point in the past. | |
| 1010 bool os::getTimesSecs(double* process_real_time, | |
| 1011 double* process_user_time, | |
| 1012 double* process_system_time) { | |
| 1013 struct tms ticks; | |
| 1014 clock_t real_ticks = times(&ticks); | |
| 1015 | |
| 1016 if (real_ticks == (clock_t) (-1)) { | |
| 1017 return false; | |
| 1018 } else { | |
| 1019 double ticks_per_second = (double) clock_tics_per_sec; | |
| 1020 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
| 1021 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
| 1022 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
| 1023 | |
| 1024 return true; | |
| 1025 } | |
| 1026 } | |
| 1027 | |
| 1028 | |
| 1029 char * os::local_time_string(char *buf, size_t buflen) { | |
| 1030 struct tm t; | |
| 1031 time_t long_time; | |
| 1032 time(&long_time); | |
| 1033 localtime_r(&long_time, &t); | |
| 1034 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 1035 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
| 1036 t.tm_hour, t.tm_min, t.tm_sec); | |
| 1037 return buf; | |
| 1038 } | |
| 1039 | |
| 1040 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
| 1041 return localtime_r(clock, res); | |
| 1042 } | |
| 1043 | |
| 1044 //////////////////////////////////////////////////////////////////////////////// | |
| 1045 // runtime exit support | |
| 1046 | |
| 1047 // Note: os::shutdown() might be called very early during initialization, or | |
| 1048 // called from signal handler. Before adding something to os::shutdown(), make | |
| 1049 // sure it is async-safe and can handle partially initialized VM. | |
| 1050 void os::shutdown() { | |
| 1051 | |
| 1052 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 1053 perfMemory_exit(); | |
| 1054 | |
| 1055 // needs to remove object in file system | |
| 1056 AttachListener::abort(); | |
| 1057 | |
| 1058 // flush buffered output, finish log files | |
| 1059 ostream_abort(); | |
| 1060 | |
| 1061 // Check for abort hook | |
| 1062 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 1063 if (abort_hook != NULL) { | |
| 1064 abort_hook(); | |
| 1065 } | |
| 1066 | |
| 1067 } | |
| 1068 | |
| 1069 // Note: os::abort() might be called very early during initialization, or | |
| 1070 // called from signal handler. Before adding something to os::abort(), make | |
| 1071 // sure it is async-safe and can handle partially initialized VM. | |
| 1072 void os::abort(bool dump_core) { | |
| 1073 os::shutdown(); | |
| 1074 if (dump_core) { | |
| 1075 #ifndef PRODUCT | |
| 1076 fdStream out(defaultStream::output_fd()); | |
| 1077 out.print_raw("Current thread is "); | |
| 1078 char buf[16]; | |
| 1079 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
| 1080 out.print_raw_cr(buf); | |
| 1081 out.print_raw_cr("Dumping core ..."); | |
| 1082 #endif | |
| 1083 ::abort(); // dump core | |
| 1084 } | |
| 1085 | |
| 1086 ::exit(1); | |
| 1087 } | |
| 1088 | |
| 1089 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 1090 void os::die() { | |
| 1091 // _exit() on BsdThreads only kills current thread | |
| 1092 ::abort(); | |
| 1093 } | |
| 1094 | |
| 1095 // unused on bsd for now. | |
| 1096 void os::set_error_file(const char *logfile) {} | |
| 1097 | |
| 1098 | |
| 1099 // This method is a copy of JDK's sysGetLastErrorString | |
| 1100 // from src/solaris/hpi/src/system_md.c | |
| 1101 | |
| 1102 size_t os::lasterror(char *buf, size_t len) { | |
| 1103 | |
| 1104 if (errno == 0) return 0; | |
| 1105 | |
| 1106 const char *s = ::strerror(errno); | |
| 1107 size_t n = ::strlen(s); | |
| 1108 if (n >= len) { | |
| 1109 n = len - 1; | |
| 1110 } | |
| 1111 ::strncpy(buf, s, n); | |
| 1112 buf[n] = '\0'; | |
| 1113 return n; | |
| 1114 } | |
| 1115 | |
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1116 intx os::current_thread_id() { |
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1117 #ifdef __APPLE__ |
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1118 return (intx)::mach_thread_self(); |
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1119 #else |
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1120 return (intx)::pthread_self(); |
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1121 #endif |
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1122 } |
| 3960 | 1123 int os::current_process_id() { |
| 1124 | |
| 1125 // Under the old bsd thread library, bsd gives each thread | |
| 1126 // its own process id. Because of this each thread will return | |
| 1127 // a different pid if this method were to return the result | |
| 1128 // of getpid(2). Bsd provides no api that returns the pid | |
| 1129 // of the launcher thread for the vm. This implementation | |
| 1130 // returns a unique pid, the pid of the launcher thread | |
| 1131 // that starts the vm 'process'. | |
| 1132 | |
| 1133 // Under the NPTL, getpid() returns the same pid as the | |
| 1134 // launcher thread rather than a unique pid per thread. | |
| 1135 // Use gettid() if you want the old pre NPTL behaviour. | |
| 1136 | |
| 1137 // if you are looking for the result of a call to getpid() that | |
| 1138 // returns a unique pid for the calling thread, then look at the | |
| 1139 // OSThread::thread_id() method in osThread_bsd.hpp file | |
| 1140 | |
| 1141 return (int)(_initial_pid ? _initial_pid : getpid()); | |
| 1142 } | |
| 1143 | |
| 1144 // DLL functions | |
| 1145 | |
| 1146 #define JNI_LIB_PREFIX "lib" | |
| 1147 #ifdef __APPLE__ | |
| 1148 #define JNI_LIB_SUFFIX ".dylib" | |
| 1149 #else | |
| 1150 #define JNI_LIB_SUFFIX ".so" | |
| 1151 #endif | |
| 1152 | |
| 1153 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
| 1154 | |
| 1155 // This must be hard coded because it's the system's temporary | |
| 1156 // directory not the java application's temp directory, ala java.io.tmpdir. | |
| 4006 | 1157 #ifdef __APPLE__ |
| 1158 // macosx has a secure per-user temporary directory | |
| 1159 char temp_path_storage[PATH_MAX]; | |
| 1160 const char* os::get_temp_directory() { | |
| 1161 static char *temp_path = NULL; | |
| 1162 if (temp_path == NULL) { | |
| 1163 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
| 1164 if (pathSize == 0 || pathSize > PATH_MAX) { | |
| 1165 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
| 1166 } | |
| 1167 temp_path = temp_path_storage; | |
| 1168 } | |
| 1169 return temp_path; | |
| 1170 } | |
| 1171 #else /* __APPLE__ */ | |
| 3960 | 1172 const char* os::get_temp_directory() { return "/tmp"; } |
| 4006 | 1173 #endif /* __APPLE__ */ |
| 3960 | 1174 |
| 1175 static bool file_exists(const char* filename) { | |
| 1176 struct stat statbuf; | |
| 1177 if (filename == NULL || strlen(filename) == 0) { | |
| 1178 return false; | |
| 1179 } | |
| 1180 return os::stat(filename, &statbuf) == 0; | |
| 1181 } | |
| 1182 | |
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1183 bool os::dll_build_name(char* buffer, size_t buflen, |
| 3960 | 1184 const char* pname, const char* fname) { |
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1185 bool retval = false; |
| 3960 | 1186 // Copied from libhpi |
| 1187 const size_t pnamelen = pname ? strlen(pname) : 0; | |
| 1188 | |
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1189 // Return error on buffer overflow. |
| 3960 | 1190 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1191 return retval; |
| 3960 | 1192 } |
| 1193 | |
| 1194 if (pnamelen == 0) { | |
| 1195 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1196 retval = true; |
| 3960 | 1197 } else if (strchr(pname, *os::path_separator()) != NULL) { |
| 1198 int n; | |
| 1199 char** pelements = split_path(pname, &n); | |
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1200 if (pelements == NULL) { |
| 9062 | 1201 return false; |
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1202 } |
| 3960 | 1203 for (int i = 0 ; i < n ; i++) { |
| 1204 // Really shouldn't be NULL, but check can't hurt | |
| 1205 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
| 1206 continue; // skip the empty path values | |
| 1207 } | |
| 1208 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
| 1209 pelements[i], fname); | |
| 1210 if (file_exists(buffer)) { | |
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1211 retval = true; |
| 3960 | 1212 break; |
| 1213 } | |
| 1214 } | |
| 1215 // release the storage | |
| 1216 for (int i = 0 ; i < n ; i++) { | |
| 1217 if (pelements[i] != NULL) { | |
| 6197 | 1218 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| 3960 | 1219 } |
| 1220 } | |
| 1221 if (pelements != NULL) { | |
| 6197 | 1222 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| 3960 | 1223 } |
| 1224 } else { | |
| 1225 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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1226 retval = true; |
| 3960 | 1227 } |
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1228 return retval; |
| 3960 | 1229 } |
| 1230 | |
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1231 // check if addr is inside libjvm.so |
| 3960 | 1232 bool os::address_is_in_vm(address addr) { |
| 1233 static address libjvm_base_addr; | |
| 1234 Dl_info dlinfo; | |
| 1235 | |
| 1236 if (libjvm_base_addr == NULL) { | |
| 1237 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
| 1238 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
| 1239 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
| 1240 } | |
| 1241 | |
| 1242 if (dladdr((void *)addr, &dlinfo)) { | |
| 1243 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
| 1244 } | |
| 1245 | |
| 1246 return false; | |
| 1247 } | |
| 1248 | |
| 6258 | 1249 |
| 1250 #define MACH_MAXSYMLEN 256 | |
| 1251 | |
| 3960 | 1252 bool os::dll_address_to_function_name(address addr, char *buf, |
| 1253 int buflen, int *offset) { | |
| 1254 Dl_info dlinfo; | |
| 6258 | 1255 char localbuf[MACH_MAXSYMLEN]; |
| 1256 | |
| 1257 // dladdr will find names of dynamic functions only, but does | |
| 1258 // it set dli_fbase with mach_header address when it "fails" ? | |
| 3960 | 1259 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { |
| 1260 if (buf != NULL) { | |
| 1261 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { | |
| 1262 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); | |
| 1263 } | |
| 1264 } | |
| 1265 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; | |
| 1266 return true; | |
| 1267 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { | |
| 1268 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), | |
|
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1269 buf, buflen, offset, dlinfo.dli_fname)) { |
| 3960 | 1270 return true; |
| 1271 } | |
| 1272 } | |
| 1273 | |
| 6258 | 1274 // Handle non-dymanic manually: |
| 1275 if (dlinfo.dli_fbase != NULL && | |
| 1276 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { | |
| 1277 if(!Decoder::demangle(localbuf, buf, buflen)) { | |
| 1278 jio_snprintf(buf, buflen, "%s", localbuf); | |
| 1279 } | |
| 1280 return true; | |
| 1281 } | |
| 3960 | 1282 if (buf != NULL) buf[0] = '\0'; |
| 1283 if (offset != NULL) *offset = -1; | |
| 1284 return false; | |
| 1285 } | |
| 1286 | |
| 1287 // ported from solaris version | |
| 1288 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1289 int buflen, int* offset) { | |
| 1290 Dl_info dlinfo; | |
| 1291 | |
| 1292 if (dladdr((void*)addr, &dlinfo)){ | |
| 1293 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
| 1294 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
| 1295 return true; | |
| 1296 } else { | |
| 1297 if (buf) buf[0] = '\0'; | |
| 1298 if (offset) *offset = -1; | |
| 1299 return false; | |
| 1300 } | |
| 1301 } | |
| 6918 | 1302 |
| 1303 // Loads .dll/.so and | |
| 1304 // in case of error it checks if .dll/.so was built for the | |
| 1305 // same architecture as Hotspot is running on | |
| 3960 | 1306 |
| 1307 #ifdef __APPLE__ | |
| 1308 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
| 1309 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1310 if (result != NULL) { | |
| 1311 // Successful loading | |
| 1312 return result; | |
| 1313 } | |
| 1314 | |
| 1315 // Read system error message into ebuf | |
| 1316 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1317 ebuf[ebuflen-1]='\0'; | |
| 1318 | |
| 1319 return NULL; | |
| 1320 } | |
| 1321 #else | |
| 1322 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
| 1323 { | |
| 1324 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1325 if (result != NULL) { | |
| 1326 // Successful loading | |
| 1327 return result; | |
| 1328 } | |
| 1329 | |
| 1330 Elf32_Ehdr elf_head; | |
| 1331 | |
| 1332 // Read system error message into ebuf | |
| 1333 // It may or may not be overwritten below | |
| 1334 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1335 ebuf[ebuflen-1]='\0'; | |
| 1336 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
| 1337 char* diag_msg_buf=ebuf+strlen(ebuf); | |
| 1338 | |
| 1339 if (diag_msg_max_length==0) { | |
| 1340 // No more space in ebuf for additional diagnostics message | |
| 1341 return NULL; | |
| 1342 } | |
| 1343 | |
| 1344 | |
| 1345 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
| 1346 | |
| 1347 if (file_descriptor < 0) { | |
| 1348 // Can't open library, report dlerror() message | |
| 1349 return NULL; | |
| 1350 } | |
| 1351 | |
| 1352 bool failed_to_read_elf_head= | |
| 1353 (sizeof(elf_head)!= | |
| 1354 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
| 1355 | |
| 1356 ::close(file_descriptor); | |
| 1357 if (failed_to_read_elf_head) { | |
| 1358 // file i/o error - report dlerror() msg | |
| 1359 return NULL; | |
| 1360 } | |
| 1361 | |
| 1362 typedef struct { | |
| 1363 Elf32_Half code; // Actual value as defined in elf.h | |
| 1364 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
| 1365 char elf_class; // 32 or 64 bit | |
| 1366 char endianess; // MSB or LSB | |
| 1367 char* name; // String representation | |
| 1368 } arch_t; | |
| 1369 | |
| 1370 #ifndef EM_486 | |
| 1371 #define EM_486 6 /* Intel 80486 */ | |
| 1372 #endif | |
| 1373 | |
| 1374 #ifndef EM_MIPS_RS3_LE | |
| 1375 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
| 1376 #endif | |
| 1377 | |
| 1378 #ifndef EM_PPC64 | |
| 1379 #define EM_PPC64 21 /* PowerPC64 */ | |
| 1380 #endif | |
| 1381 | |
| 1382 #ifndef EM_S390 | |
| 1383 #define EM_S390 22 /* IBM System/390 */ | |
| 1384 #endif | |
| 1385 | |
| 1386 #ifndef EM_IA_64 | |
| 1387 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
| 1388 #endif | |
| 1389 | |
| 1390 #ifndef EM_X86_64 | |
| 1391 #define EM_X86_64 62 /* AMD x86-64 */ | |
| 1392 #endif | |
| 1393 | |
| 1394 static const arch_t arch_array[]={ | |
| 1395 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1396 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1397 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
| 1398 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
| 1399 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1400 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1401 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
| 1402 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
| 1403 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
| 1404 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
| 1405 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
| 1406 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
| 1407 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
| 1408 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
| 1409 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
| 1410 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
| 1411 }; | |
| 1412 | |
| 1413 #if (defined IA32) | |
| 1414 static Elf32_Half running_arch_code=EM_386; | |
| 1415 #elif (defined AMD64) | |
| 1416 static Elf32_Half running_arch_code=EM_X86_64; | |
| 1417 #elif (defined IA64) | |
| 1418 static Elf32_Half running_arch_code=EM_IA_64; | |
| 1419 #elif (defined __sparc) && (defined _LP64) | |
| 1420 static Elf32_Half running_arch_code=EM_SPARCV9; | |
| 1421 #elif (defined __sparc) && (!defined _LP64) | |
| 1422 static Elf32_Half running_arch_code=EM_SPARC; | |
| 1423 #elif (defined __powerpc64__) | |
| 1424 static Elf32_Half running_arch_code=EM_PPC64; | |
| 1425 #elif (defined __powerpc__) | |
| 1426 static Elf32_Half running_arch_code=EM_PPC; | |
| 1427 #elif (defined ARM) | |
| 1428 static Elf32_Half running_arch_code=EM_ARM; | |
| 1429 #elif (defined S390) | |
| 1430 static Elf32_Half running_arch_code=EM_S390; | |
| 1431 #elif (defined ALPHA) | |
| 1432 static Elf32_Half running_arch_code=EM_ALPHA; | |
| 1433 #elif (defined MIPSEL) | |
| 1434 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
| 1435 #elif (defined PARISC) | |
| 1436 static Elf32_Half running_arch_code=EM_PARISC; | |
| 1437 #elif (defined MIPS) | |
| 1438 static Elf32_Half running_arch_code=EM_MIPS; | |
| 1439 #elif (defined M68K) | |
| 1440 static Elf32_Half running_arch_code=EM_68K; | |
| 1441 #else | |
| 1442 #error Method os::dll_load requires that one of following is defined:\ | |
| 1443 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
| 1444 #endif | |
| 1445 | |
| 1446 // Identify compatability class for VM's architecture and library's architecture | |
| 1447 // Obtain string descriptions for architectures | |
| 1448 | |
| 1449 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
| 1450 int running_arch_index=-1; | |
| 1451 | |
| 1452 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
| 1453 if (running_arch_code == arch_array[i].code) { | |
| 1454 running_arch_index = i; | |
| 1455 } | |
| 1456 if (lib_arch.code == arch_array[i].code) { | |
| 1457 lib_arch.compat_class = arch_array[i].compat_class; | |
| 1458 lib_arch.name = arch_array[i].name; | |
| 1459 } | |
| 1460 } | |
| 1461 | |
| 1462 assert(running_arch_index != -1, | |
| 1463 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
| 1464 if (running_arch_index == -1) { | |
| 1465 // Even though running architecture detection failed | |
| 1466 // we may still continue with reporting dlerror() message | |
| 1467 return NULL; | |
| 1468 } | |
| 1469 | |
| 1470 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
| 1471 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
| 1472 return NULL; | |
| 1473 } | |
| 1474 | |
| 1475 #ifndef S390 | |
| 1476 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
| 1477 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
| 1478 return NULL; | |
| 1479 } | |
| 1480 #endif // !S390 | |
| 1481 | |
| 1482 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
| 1483 if ( lib_arch.name!=NULL ) { | |
| 1484 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1485 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
| 1486 lib_arch.name, arch_array[running_arch_index].name); | |
| 1487 } else { | |
| 1488 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1489 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
| 1490 lib_arch.code, | |
| 1491 arch_array[running_arch_index].name); | |
| 1492 } | |
| 1493 } | |
| 1494 | |
| 1495 return NULL; | |
| 1496 } | |
| 1497 #endif /* !__APPLE__ */ | |
| 1498 | |
| 1499 // XXX: Do we need a lock around this as per Linux? | |
| 1500 void* os::dll_lookup(void* handle, const char* name) { | |
| 1501 return dlsym(handle, name); | |
| 1502 } | |
| 1503 | |
| 1504 | |
| 1505 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
| 1506 int fd = ::open(filename, O_RDONLY); | |
| 1507 if (fd == -1) { | |
| 1508 return false; | |
| 1509 } | |
| 1510 | |
| 1511 char buf[32]; | |
| 1512 int bytes; | |
| 1513 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
| 1514 st->print_raw(buf, bytes); | |
| 1515 } | |
| 1516 | |
| 1517 ::close(fd); | |
| 1518 | |
| 1519 return true; | |
| 1520 } | |
| 1521 | |
| 1522 void os::print_dll_info(outputStream *st) { | |
| 1523 st->print_cr("Dynamic libraries:"); | |
| 1524 #ifdef RTLD_DI_LINKMAP | |
| 1525 Dl_info dli; | |
| 1526 void *handle; | |
| 1527 Link_map *map; | |
| 1528 Link_map *p; | |
| 1529 | |
| 1530 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { | |
| 1531 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1532 return; | |
| 1533 } | |
| 1534 handle = dlopen(dli.dli_fname, RTLD_LAZY); | |
| 1535 if (handle == NULL) { | |
| 1536 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1537 return; | |
| 1538 } | |
| 1539 dlinfo(handle, RTLD_DI_LINKMAP, &map); | |
| 1540 if (map == NULL) { | |
| 1541 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1542 return; | |
| 1543 } | |
| 1544 | |
| 1545 while (map->l_prev != NULL) | |
| 1546 map = map->l_prev; | |
| 1547 | |
| 1548 while (map != NULL) { | |
| 1549 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); | |
| 1550 map = map->l_next; | |
| 1551 } | |
| 1552 | |
| 1553 dlclose(handle); | |
| 1554 #elif defined(__APPLE__) | |
| 1555 uint32_t count; | |
| 1556 uint32_t i; | |
| 1557 | |
| 1558 count = _dyld_image_count(); | |
| 1559 for (i = 1; i < count; i++) { | |
| 1560 const char *name = _dyld_get_image_name(i); | |
| 1561 intptr_t slide = _dyld_get_image_vmaddr_slide(i); | |
| 1562 st->print_cr(PTR_FORMAT " \t%s", slide, name); | |
| 1563 } | |
| 1564 #else | |
| 1565 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1566 #endif | |
| 1567 } | |
| 1568 | |
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1569 void os::print_os_info_brief(outputStream* st) { |
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1570 st->print("Bsd"); |
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1571 |
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1572 os::Posix::print_uname_info(st); |
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1573 } |
| 3960 | 1574 |
| 1575 void os::print_os_info(outputStream* st) { | |
| 1576 st->print("OS:"); | |
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1577 st->print("Bsd"); |
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1578 |
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1579 os::Posix::print_uname_info(st); |
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1580 |
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1581 os::Posix::print_rlimit_info(st); |
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1582 |
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1583 os::Posix::print_load_average(st); |
| 3960 | 1584 } |
| 1585 | |
| 1586 void os::pd_print_cpu_info(outputStream* st) { | |
| 1587 // Nothing to do for now. | |
| 1588 } | |
| 1589 | |
| 1590 void os::print_memory_info(outputStream* st) { | |
| 1591 | |
| 1592 st->print("Memory:"); | |
| 1593 st->print(" %dk page", os::vm_page_size()>>10); | |
| 1594 | |
| 1595 st->print(", physical " UINT64_FORMAT "k", | |
| 1596 os::physical_memory() >> 10); | |
| 1597 st->print("(" UINT64_FORMAT "k free)", | |
| 1598 os::available_memory() >> 10); | |
| 1599 st->cr(); | |
| 1600 | |
| 1601 // meminfo | |
| 1602 st->print("\n/proc/meminfo:\n"); | |
| 1603 _print_ascii_file("/proc/meminfo", st); | |
| 1604 st->cr(); | |
| 1605 } | |
| 1606 | |
| 1607 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
| 1608 // but they're the same for all the bsd arch that we support | |
| 1609 // and they're the same for solaris but there's no common place to put this. | |
| 1610 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
| 1611 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
| 1612 "ILL_COPROC", "ILL_BADSTK" }; | |
| 1613 | |
| 1614 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
| 1615 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
| 1616 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
| 1617 | |
| 1618 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
| 1619 | |
| 1620 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
| 1621 | |
| 1622 void os::print_siginfo(outputStream* st, void* siginfo) { | |
| 1623 st->print("siginfo:"); | |
| 1624 | |
| 1625 const int buflen = 100; | |
| 1626 char buf[buflen]; | |
| 1627 siginfo_t *si = (siginfo_t*)siginfo; | |
| 1628 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
| 1629 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
| 1630 st->print("si_errno=%s", buf); | |
| 1631 } else { | |
| 1632 st->print("si_errno=%d", si->si_errno); | |
| 1633 } | |
| 1634 const int c = si->si_code; | |
| 1635 assert(c > 0, "unexpected si_code"); | |
| 1636 switch (si->si_signo) { | |
| 1637 case SIGILL: | |
| 1638 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
| 1639 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1640 break; | |
| 1641 case SIGFPE: | |
| 1642 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
| 1643 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1644 break; | |
| 1645 case SIGSEGV: | |
| 1646 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
| 1647 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1648 break; | |
| 1649 case SIGBUS: | |
| 1650 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
| 1651 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1652 break; | |
| 1653 default: | |
| 1654 st->print(", si_code=%d", si->si_code); | |
| 1655 // no si_addr | |
| 1656 } | |
| 1657 | |
| 1658 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
| 1659 UseSharedSpaces) { | |
| 1660 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 1661 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
| 1662 st->print("\n\nError accessing class data sharing archive." \ | |
| 1663 " Mapped file inaccessible during execution, " \ | |
| 1664 " possible disk/network problem."); | |
| 1665 } | |
| 1666 } | |
| 1667 st->cr(); | |
| 1668 } | |
| 1669 | |
| 1670 | |
| 1671 static void print_signal_handler(outputStream* st, int sig, | |
| 1672 char* buf, size_t buflen); | |
| 1673 | |
| 1674 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 1675 st->print_cr("Signal Handlers:"); | |
| 1676 print_signal_handler(st, SIGSEGV, buf, buflen); | |
| 1677 print_signal_handler(st, SIGBUS , buf, buflen); | |
| 1678 print_signal_handler(st, SIGFPE , buf, buflen); | |
| 1679 print_signal_handler(st, SIGPIPE, buf, buflen); | |
| 1680 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
| 1681 print_signal_handler(st, SIGILL , buf, buflen); | |
| 1682 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
| 1683 print_signal_handler(st, SR_signum, buf, buflen); | |
| 1684 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
| 1685 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
| 1686 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
| 1687 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
| 1688 } | |
| 1689 | |
| 1690 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
| 1691 | |
|
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1692 // Find the full path to the current module, libjvm |
| 3960 | 1693 void os::jvm_path(char *buf, jint buflen) { |
| 1694 // Error checking. | |
| 1695 if (buflen < MAXPATHLEN) { | |
| 1696 assert(false, "must use a large-enough buffer"); | |
| 1697 buf[0] = '\0'; | |
| 1698 return; | |
| 1699 } | |
| 1700 // Lazy resolve the path to current module. | |
| 1701 if (saved_jvm_path[0] != 0) { | |
| 1702 strcpy(buf, saved_jvm_path); | |
| 1703 return; | |
| 1704 } | |
| 1705 | |
| 1706 char dli_fname[MAXPATHLEN]; | |
| 1707 bool ret = dll_address_to_library_name( | |
| 1708 CAST_FROM_FN_PTR(address, os::jvm_path), | |
| 1709 dli_fname, sizeof(dli_fname), NULL); | |
| 1710 assert(ret != 0, "cannot locate libjvm"); | |
| 1711 char *rp = realpath(dli_fname, buf); | |
| 1712 if (rp == NULL) | |
| 1713 return; | |
| 1714 | |
| 1715 if (Arguments::created_by_gamma_launcher()) { | |
| 1716 // Support for the gamma launcher. Typical value for buf is | |
| 4846 | 1717 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
| 3960 | 1718 // the right place in the string, then assume we are installed in a JDK and |
| 4846 | 1719 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
| 1720 // construct a path to the JVM being overridden. | |
| 1721 | |
| 3960 | 1722 const char *p = buf + strlen(buf) - 1; |
| 1723 for (int count = 0; p > buf && count < 5; ++count) { | |
| 1724 for (--p; p > buf && *p != '/'; --p) | |
| 1725 /* empty */ ; | |
| 1726 } | |
| 1727 | |
| 1728 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
| 1729 // Look for JAVA_HOME in the environment. | |
| 1730 char* java_home_var = ::getenv("JAVA_HOME"); | |
| 1731 if (java_home_var != NULL && java_home_var[0] != 0) { | |
| 1732 char* jrelib_p; | |
| 1733 int len; | |
| 1734 | |
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1735 // Check the current module name "libjvm" |
| 3960 | 1736 p = strrchr(buf, '/'); |
| 1737 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
| 1738 | |
| 1739 rp = realpath(java_home_var, buf); | |
| 1740 if (rp == NULL) | |
| 1741 return; | |
| 1742 | |
| 1743 // determine if this is a legacy image or modules image | |
| 1744 // modules image doesn't have "jre" subdirectory | |
| 1745 len = strlen(buf); | |
| 1746 jrelib_p = buf + len; | |
| 4846 | 1747 |
| 1748 // Add the appropriate library subdir | |
| 1749 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
| 3960 | 1750 if (0 != access(buf, F_OK)) { |
| 4846 | 1751 snprintf(jrelib_p, buflen-len, "/lib"); |
| 3960 | 1752 } |
| 1753 | |
| 4846 | 1754 // Add the appropriate client or server subdir |
| 1755 len = strlen(buf); | |
| 1756 jrelib_p = buf + len; | |
| 1757 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
| 1758 if (0 != access(buf, F_OK)) { | |
| 1759 snprintf(jrelib_p, buflen-len, ""); | |
| 1760 } | |
| 1761 | |
| 1762 // If the path exists within JAVA_HOME, add the JVM library name | |
| 1763 // to complete the path to JVM being overridden. Otherwise fallback | |
| 1764 // to the path to the current library. | |
| 3960 | 1765 if (0 == access(buf, F_OK)) { |
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1766 // Use current module name "libjvm" |
| 3960 | 1767 len = strlen(buf); |
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1768 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
| 3960 | 1769 } else { |
| 4846 | 1770 // Fall back to path of current library |
| 3960 | 1771 rp = realpath(dli_fname, buf); |
| 1772 if (rp == NULL) | |
| 1773 return; | |
| 1774 } | |
| 1775 } | |
| 1776 } | |
| 1777 } | |
| 1778 | |
| 1779 strcpy(saved_jvm_path, buf); | |
| 1780 } | |
| 1781 | |
| 1782 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 1783 // no prefix required, not even "_" | |
| 1784 } | |
| 1785 | |
| 1786 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 1787 // no suffix required | |
| 1788 } | |
| 1789 | |
| 1790 //////////////////////////////////////////////////////////////////////////////// | |
| 1791 // sun.misc.Signal support | |
| 1792 | |
| 1793 static volatile jint sigint_count = 0; | |
| 1794 | |
| 1795 static void | |
| 1796 UserHandler(int sig, void *siginfo, void *context) { | |
| 1797 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
| 1798 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
| 1799 // don't want to flood the manager thread with sem_post requests. | |
| 1800 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
| 1801 return; | |
| 1802 | |
| 1803 // Ctrl-C is pressed during error reporting, likely because the error | |
| 1804 // handler fails to abort. Let VM die immediately. | |
| 1805 if (sig == SIGINT && is_error_reported()) { | |
| 1806 os::die(); | |
| 1807 } | |
| 1808 | |
| 1809 os::signal_notify(sig); | |
| 1810 } | |
| 1811 | |
| 1812 void* os::user_handler() { | |
| 1813 return CAST_FROM_FN_PTR(void*, UserHandler); | |
| 1814 } | |
| 1815 | |
| 1816 extern "C" { | |
| 1817 typedef void (*sa_handler_t)(int); | |
| 1818 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
| 1819 } | |
| 1820 | |
| 1821 void* os::signal(int signal_number, void* handler) { | |
| 1822 struct sigaction sigAct, oldSigAct; | |
| 1823 | |
| 1824 sigfillset(&(sigAct.sa_mask)); | |
| 1825 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 1826 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
| 1827 | |
| 1828 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
| 1829 // -1 means registration failed | |
| 1830 return (void *)-1; | |
| 1831 } | |
| 1832 | |
| 1833 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
| 1834 } | |
| 1835 | |
| 1836 void os::signal_raise(int signal_number) { | |
| 1837 ::raise(signal_number); | |
| 1838 } | |
| 1839 | |
| 1840 /* | |
| 1841 * The following code is moved from os.cpp for making this | |
| 1842 * code platform specific, which it is by its very nature. | |
| 1843 */ | |
| 1844 | |
| 1845 // Will be modified when max signal is changed to be dynamic | |
| 1846 int os::sigexitnum_pd() { | |
| 1847 return NSIG; | |
| 1848 } | |
| 1849 | |
| 1850 // a counter for each possible signal value | |
| 1851 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 1852 | |
| 1853 // Bsd(POSIX) specific hand shaking semaphore. | |
| 1854 #ifdef __APPLE__ | |
| 10405 | 1855 typedef semaphore_t os_semaphore_t; |
| 3960 | 1856 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) |
| 10405 | 1857 #define SEM_WAIT(sem) semaphore_wait(sem) |
| 1858 #define SEM_POST(sem) semaphore_signal(sem) | |
| 1859 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) | |
| 3960 | 1860 #else |
| 10405 | 1861 typedef sem_t os_semaphore_t; |
| 3960 | 1862 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) |
| 10405 | 1863 #define SEM_WAIT(sem) sem_wait(&sem) |
| 1864 #define SEM_POST(sem) sem_post(&sem) | |
| 1865 #define SEM_DESTROY(sem) sem_destroy(&sem) | |
| 3960 | 1866 #endif |
| 1867 | |
| 10405 | 1868 class Semaphore : public StackObj { |
| 1869 public: | |
| 1870 Semaphore(); | |
| 1871 ~Semaphore(); | |
| 1872 void signal(); | |
| 1873 void wait(); | |
| 1874 bool trywait(); | |
| 1875 bool timedwait(unsigned int sec, int nsec); | |
| 1876 private: | |
| 1877 jlong currenttime() const; | |
| 1878 semaphore_t _semaphore; | |
| 1879 }; | |
| 1880 | |
| 1881 Semaphore::Semaphore() : _semaphore(0) { | |
| 1882 SEM_INIT(_semaphore, 0); | |
| 1883 } | |
| 1884 | |
| 1885 Semaphore::~Semaphore() { | |
| 1886 SEM_DESTROY(_semaphore); | |
| 1887 } | |
| 1888 | |
| 1889 void Semaphore::signal() { | |
| 1890 SEM_POST(_semaphore); | |
| 1891 } | |
| 1892 | |
| 1893 void Semaphore::wait() { | |
| 1894 SEM_WAIT(_semaphore); | |
| 1895 } | |
| 1896 | |
| 1897 jlong Semaphore::currenttime() const { | |
| 1898 struct timeval tv; | |
| 1899 gettimeofday(&tv, NULL); | |
| 1900 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); | |
| 1901 } | |
| 1902 | |
| 1903 #ifdef __APPLE__ | |
| 1904 bool Semaphore::trywait() { | |
| 1905 return timedwait(0, 0); | |
| 1906 } | |
| 1907 | |
| 1908 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
| 1909 kern_return_t kr = KERN_ABORTED; | |
| 1910 mach_timespec_t waitspec; | |
| 1911 waitspec.tv_sec = sec; | |
| 1912 waitspec.tv_nsec = nsec; | |
| 1913 | |
| 1914 jlong starttime = currenttime(); | |
| 1915 | |
| 1916 kr = semaphore_timedwait(_semaphore, waitspec); | |
| 1917 while (kr == KERN_ABORTED) { | |
| 1918 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; | |
| 1919 | |
| 1920 jlong current = currenttime(); | |
| 1921 jlong passedtime = current - starttime; | |
| 1922 | |
| 1923 if (passedtime >= totalwait) { | |
| 1924 waitspec.tv_sec = 0; | |
| 1925 waitspec.tv_nsec = 0; | |
| 1926 } else { | |
| 1927 jlong waittime = totalwait - (current - starttime); | |
| 1928 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; | |
| 1929 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; | |
| 1930 } | |
| 1931 | |
| 1932 kr = semaphore_timedwait(_semaphore, waitspec); | |
| 1933 } | |
| 1934 | |
| 1935 return kr == KERN_SUCCESS; | |
| 1936 } | |
| 1937 | |
| 1938 #else | |
| 1939 | |
| 1940 bool Semaphore::trywait() { | |
| 1941 return sem_trywait(&_semaphore) == 0; | |
| 1942 } | |
| 1943 | |
| 1944 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
| 1945 struct timespec ts; | |
| 1946 jlong endtime = unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); | |
| 1947 | |
| 1948 while (1) { | |
| 1949 int result = sem_timedwait(&_semaphore, &ts); | |
| 1950 if (result == 0) { | |
| 1951 return true; | |
| 1952 } else if (errno == EINTR) { | |
| 1953 continue; | |
| 1954 } else if (errno == ETIMEDOUT) { | |
| 1955 return false; | |
| 1956 } else { | |
| 1957 return false; | |
| 1958 } | |
| 1959 } | |
| 1960 } | |
| 1961 | |
| 1962 #endif // __APPLE__ | |
| 1963 | |
| 1964 static os_semaphore_t sig_sem; | |
| 1965 static Semaphore sr_semaphore; | |
| 1966 | |
| 3960 | 1967 void os::signal_init_pd() { |
| 1968 // Initialize signal structures | |
| 1969 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 1970 | |
| 1971 // Initialize signal semaphore | |
| 1972 ::SEM_INIT(sig_sem, 0); | |
| 1973 } | |
| 1974 | |
| 1975 void os::signal_notify(int sig) { | |
| 1976 Atomic::inc(&pending_signals[sig]); | |
| 1977 ::SEM_POST(sig_sem); | |
| 1978 } | |
| 1979 | |
| 1980 static int check_pending_signals(bool wait) { | |
| 1981 Atomic::store(0, &sigint_count); | |
| 1982 for (;;) { | |
| 1983 for (int i = 0; i < NSIG + 1; i++) { | |
| 1984 jint n = pending_signals[i]; | |
| 1985 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 1986 return i; | |
| 1987 } | |
| 1988 } | |
| 1989 if (!wait) { | |
| 1990 return -1; | |
| 1991 } | |
| 1992 JavaThread *thread = JavaThread::current(); | |
| 1993 ThreadBlockInVM tbivm(thread); | |
| 1994 | |
| 1995 bool threadIsSuspended; | |
| 1996 do { | |
| 1997 thread->set_suspend_equivalent(); | |
| 1998 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 1999 ::SEM_WAIT(sig_sem); | |
| 2000 | |
| 2001 // were we externally suspended while we were waiting? | |
| 2002 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 2003 if (threadIsSuspended) { | |
| 2004 // | |
| 2005 // The semaphore has been incremented, but while we were waiting | |
| 2006 // another thread suspended us. We don't want to continue running | |
| 2007 // while suspended because that would surprise the thread that | |
| 2008 // suspended us. | |
| 2009 // | |
| 2010 ::SEM_POST(sig_sem); | |
| 2011 | |
| 2012 thread->java_suspend_self(); | |
| 2013 } | |
| 2014 } while (threadIsSuspended); | |
| 2015 } | |
| 2016 } | |
| 2017 | |
| 2018 int os::signal_lookup() { | |
| 2019 return check_pending_signals(false); | |
| 2020 } | |
| 2021 | |
| 2022 int os::signal_wait() { | |
| 2023 return check_pending_signals(true); | |
| 2024 } | |
| 2025 | |
| 2026 //////////////////////////////////////////////////////////////////////////////// | |
| 2027 // Virtual Memory | |
| 2028 | |
| 2029 int os::vm_page_size() { | |
| 2030 // Seems redundant as all get out | |
| 2031 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 2032 return os::Bsd::page_size(); | |
| 2033 } | |
| 2034 | |
| 2035 // Solaris allocates memory by pages. | |
| 2036 int os::vm_allocation_granularity() { | |
| 2037 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 2038 return os::Bsd::page_size(); | |
| 2039 } | |
| 2040 | |
| 2041 // Rationale behind this function: | |
| 2042 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
| 2043 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
| 2044 // samples for JITted code. Here we create private executable mapping over the code cache | |
| 2045 // and then we can use standard (well, almost, as mapping can change) way to provide | |
| 2046 // info for the reporting script by storing timestamp and location of symbol | |
| 2047 void bsd_wrap_code(char* base, size_t size) { | |
| 2048 static volatile jint cnt = 0; | |
| 2049 | |
| 2050 if (!UseOprofile) { | |
| 2051 return; | |
| 2052 } | |
| 2053 | |
| 2054 char buf[PATH_MAX + 1]; | |
| 2055 int num = Atomic::add(1, &cnt); | |
| 2056 | |
| 2057 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
| 2058 os::get_temp_directory(), os::current_process_id(), num); | |
| 2059 unlink(buf); | |
| 2060 | |
| 2061 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
| 2062 | |
| 2063 if (fd != -1) { | |
| 2064 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
| 2065 if (rv != (off_t)-1) { | |
| 2066 if (::write(fd, "", 1) == 1) { | |
| 2067 mmap(base, size, | |
| 2068 PROT_READ|PROT_WRITE|PROT_EXEC, | |
| 2069 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
| 2070 } | |
| 2071 } | |
| 2072 ::close(fd); | |
| 2073 unlink(buf); | |
| 2074 } | |
| 2075 } | |
| 2076 | |
| 2077 // NOTE: Bsd kernel does not really reserve the pages for us. | |
| 2078 // All it does is to check if there are enough free pages | |
| 2079 // left at the time of mmap(). This could be a potential | |
| 2080 // problem. | |
| 6197 | 2081 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| 3960 | 2082 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| 2083 #ifdef __OpenBSD__ | |
| 2084 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 2085 return ::mprotect(addr, size, prot) == 0; | |
| 2086 #else | |
| 2087 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
| 2088 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
| 2089 return res != (uintptr_t) MAP_FAILED; | |
| 2090 #endif | |
| 2091 } | |
| 2092 | |
| 2093 | |
| 6197 | 2094 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| 3960 | 2095 bool exec) { |
| 2096 return commit_memory(addr, size, exec); | |
| 2097 } | |
| 2098 | |
| 6197 | 2099 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2100 } |
| 2101 | |
| 6197 | 2102 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2103 ::madvise(addr, bytes, MADV_DONTNEED); |
| 2104 } | |
| 2105 | |
| 2106 void os::numa_make_global(char *addr, size_t bytes) { | |
| 2107 } | |
| 2108 | |
| 2109 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
| 2110 } | |
| 2111 | |
| 2112 bool os::numa_topology_changed() { return false; } | |
| 2113 | |
| 2114 size_t os::numa_get_groups_num() { | |
| 2115 return 1; | |
| 2116 } | |
| 2117 | |
| 2118 int os::numa_get_group_id() { | |
| 2119 return 0; | |
| 2120 } | |
| 2121 | |
| 2122 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
| 2123 if (size > 0) { | |
| 2124 ids[0] = 0; | |
| 2125 return 1; | |
| 2126 } | |
| 2127 return 0; | |
| 2128 } | |
| 2129 | |
| 2130 bool os::get_page_info(char *start, page_info* info) { | |
| 2131 return false; | |
| 2132 } | |
| 2133 | |
| 2134 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2135 return end; | |
| 2136 } | |
| 2137 | |
| 2138 | |
| 6197 | 2139 bool os::pd_uncommit_memory(char* addr, size_t size) { |
| 3960 | 2140 #ifdef __OpenBSD__ |
| 2141 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 2142 return ::mprotect(addr, size, PROT_NONE) == 0; | |
| 2143 #else | |
| 2144 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
| 2145 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
| 2146 return res != (uintptr_t) MAP_FAILED; | |
| 2147 #endif | |
| 2148 } | |
| 2149 | |
| 6197 | 2150 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
| 3960 | 2151 return os::commit_memory(addr, size); |
| 2152 } | |
| 2153 | |
| 2154 // If this is a growable mapping, remove the guard pages entirely by | |
| 2155 // munmap()ping them. If not, just call uncommit_memory(). | |
| 2156 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
| 2157 return os::uncommit_memory(addr, size); | |
| 2158 } | |
| 2159 | |
| 2160 static address _highest_vm_reserved_address = NULL; | |
| 2161 | |
| 2162 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
| 2163 // at 'requested_addr'. If there are existing memory mappings at the same | |
| 2164 // location, however, they will be overwritten. If 'fixed' is false, | |
| 2165 // 'requested_addr' is only treated as a hint, the return value may or | |
| 2166 // may not start from the requested address. Unlike Bsd mmap(), this | |
| 2167 // function returns NULL to indicate failure. | |
| 2168 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
| 2169 char * addr; | |
| 2170 int flags; | |
| 2171 | |
| 2172 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
| 2173 if (fixed) { | |
| 2174 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
| 2175 flags |= MAP_FIXED; | |
| 2176 } | |
| 2177 | |
| 10157 | 2178 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
| 2179 // touch an uncommitted page. Otherwise, the read/write might | |
| 2180 // succeed if we have enough swap space to back the physical page. | |
| 2181 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
| 3960 | 2182 flags, -1, 0); |
| 2183 | |
| 2184 if (addr != MAP_FAILED) { | |
| 2185 // anon_mmap() should only get called during VM initialization, | |
| 2186 // don't need lock (actually we can skip locking even it can be called | |
| 2187 // from multiple threads, because _highest_vm_reserved_address is just a | |
| 2188 // hint about the upper limit of non-stack memory regions.) | |
| 2189 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
| 2190 _highest_vm_reserved_address = (address)addr + bytes; | |
| 2191 } | |
| 2192 } | |
| 2193 | |
| 2194 return addr == MAP_FAILED ? NULL : addr; | |
| 2195 } | |
| 2196 | |
| 2197 // Don't update _highest_vm_reserved_address, because there might be memory | |
| 2198 // regions above addr + size. If so, releasing a memory region only creates | |
| 2199 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
| 2200 // | |
| 2201 static int anon_munmap(char * addr, size_t size) { | |
| 2202 return ::munmap(addr, size) == 0; | |
| 2203 } | |
| 2204 | |
| 6197 | 2205 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| 3960 | 2206 size_t alignment_hint) { |
| 2207 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
| 2208 } | |
| 2209 | |
| 6197 | 2210 bool os::pd_release_memory(char* addr, size_t size) { |
| 3960 | 2211 return anon_munmap(addr, size); |
| 2212 } | |
| 2213 | |
| 2214 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
| 2215 // Bsd wants the mprotect address argument to be page aligned. | |
| 2216 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
| 2217 | |
| 2218 // According to SUSv3, mprotect() should only be used with mappings | |
| 2219 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
| 2220 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
| 2221 // protection of malloc'ed or statically allocated memory). Check the | |
| 2222 // caller if you hit this assert. | |
| 2223 assert(addr == bottom, "sanity check"); | |
| 2224 | |
| 2225 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
| 2226 return ::mprotect(bottom, size, prot) == 0; | |
| 2227 } | |
| 2228 | |
| 2229 // Set protections specified | |
| 2230 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
| 2231 bool is_committed) { | |
| 2232 unsigned int p = 0; | |
| 2233 switch (prot) { | |
| 2234 case MEM_PROT_NONE: p = PROT_NONE; break; | |
| 2235 case MEM_PROT_READ: p = PROT_READ; break; | |
| 2236 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
| 2237 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
| 2238 default: | |
| 2239 ShouldNotReachHere(); | |
| 2240 } | |
| 2241 // is_committed is unused. | |
| 2242 return bsd_mprotect(addr, bytes, p); | |
| 2243 } | |
| 2244 | |
| 2245 bool os::guard_memory(char* addr, size_t size) { | |
| 2246 return bsd_mprotect(addr, size, PROT_NONE); | |
| 2247 } | |
| 2248 | |
| 2249 bool os::unguard_memory(char* addr, size_t size) { | |
| 2250 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
| 2251 } | |
| 2252 | |
| 2253 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
| 6918 | 2254 return false; |
| 3960 | 2255 } |
| 2256 | |
| 2257 // Large page support | |
| 2258 | |
| 2259 static size_t _large_page_size = 0; | |
| 2260 | |
| 2261 void os::large_page_init() { | |
| 2262 } | |
| 2263 | |
| 2264 | |
| 2265 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { | |
| 2266 // "exec" is passed in but not used. Creating the shared image for | |
| 2267 // the code cache doesn't have an SHM_X executable permission to check. | |
| 2268 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
| 2269 | |
| 2270 key_t key = IPC_PRIVATE; | |
| 2271 char *addr; | |
| 2272 | |
| 2273 bool warn_on_failure = UseLargePages && | |
| 2274 (!FLAG_IS_DEFAULT(UseLargePages) || | |
| 2275 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
| 2276 ); | |
| 2277 char msg[128]; | |
| 2278 | |
| 2279 // Create a large shared memory region to attach to based on size. | |
| 2280 // Currently, size is the total size of the heap | |
| 2281 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
| 2282 if (shmid == -1) { | |
| 2283 // Possible reasons for shmget failure: | |
| 2284 // 1. shmmax is too small for Java heap. | |
| 2285 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
| 2286 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
| 2287 // 2. not enough large page memory. | |
| 2288 // > check available large pages: cat /proc/meminfo | |
| 2289 // > increase amount of large pages: | |
| 2290 // echo new_value > /proc/sys/vm/nr_hugepages | |
| 2291 // Note 1: different Bsd may use different name for this property, | |
| 2292 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
| 2293 // Note 2: it's possible there's enough physical memory available but | |
| 2294 // they are so fragmented after a long run that they can't | |
| 2295 // coalesce into large pages. Try to reserve large pages when | |
| 2296 // the system is still "fresh". | |
| 2297 if (warn_on_failure) { | |
| 2298 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
| 2299 warning(msg); | |
| 2300 } | |
| 2301 return NULL; | |
| 2302 } | |
| 2303 | |
| 2304 // attach to the region | |
| 2305 addr = (char*)shmat(shmid, req_addr, 0); | |
| 2306 int err = errno; | |
| 2307 | |
| 2308 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
| 2309 // will be deleted when it's detached by shmdt() or when the process | |
| 2310 // terminates. If shmat() is not successful this will remove the shared | |
| 2311 // segment immediately. | |
| 2312 shmctl(shmid, IPC_RMID, NULL); | |
| 2313 | |
| 2314 if ((intptr_t)addr == -1) { | |
| 2315 if (warn_on_failure) { | |
| 2316 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
| 2317 warning(msg); | |
| 2318 } | |
| 2319 return NULL; | |
| 2320 } | |
| 2321 | |
|
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2322 // The memory is committed |
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2323 address pc = CALLER_PC; |
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2324 MemTracker::record_virtual_memory_reserve((address)addr, bytes, pc); |
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2325 MemTracker::record_virtual_memory_commit((address)addr, bytes, pc); |
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2326 |
| 3960 | 2327 return addr; |
| 2328 } | |
| 2329 | |
| 2330 bool os::release_memory_special(char* base, size_t bytes) { | |
| 2331 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
| 2332 int rslt = shmdt(base); | |
|
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2333 if (rslt == 0) { |
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2334 MemTracker::record_virtual_memory_uncommit((address)base, bytes); |
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2335 MemTracker::record_virtual_memory_release((address)base, bytes); |
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2336 return true; |
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2337 } else { |
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2338 return false; |
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2339 } |
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2340 |
| 3960 | 2341 } |
| 2342 | |
| 2343 size_t os::large_page_size() { | |
| 2344 return _large_page_size; | |
| 2345 } | |
| 2346 | |
| 2347 // HugeTLBFS allows application to commit large page memory on demand; | |
| 2348 // with SysV SHM the entire memory region must be allocated as shared | |
| 2349 // memory. | |
| 2350 bool os::can_commit_large_page_memory() { | |
| 2351 return UseHugeTLBFS; | |
| 2352 } | |
| 2353 | |
| 2354 bool os::can_execute_large_page_memory() { | |
| 2355 return UseHugeTLBFS; | |
| 2356 } | |
| 2357 | |
| 2358 // Reserve memory at an arbitrary address, only if that area is | |
| 2359 // available (and not reserved for something else). | |
| 2360 | |
| 6197 | 2361 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| 3960 | 2362 const int max_tries = 10; |
| 2363 char* base[max_tries]; | |
| 2364 size_t size[max_tries]; | |
| 2365 const size_t gap = 0x000000; | |
| 2366 | |
| 2367 // Assert only that the size is a multiple of the page size, since | |
| 2368 // that's all that mmap requires, and since that's all we really know | |
| 2369 // about at this low abstraction level. If we need higher alignment, | |
| 2370 // we can either pass an alignment to this method or verify alignment | |
| 2371 // in one of the methods further up the call chain. See bug 5044738. | |
| 2372 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
| 2373 | |
| 2374 // Repeatedly allocate blocks until the block is allocated at the | |
| 2375 // right spot. Give up after max_tries. Note that reserve_memory() will | |
| 2376 // automatically update _highest_vm_reserved_address if the call is | |
| 2377 // successful. The variable tracks the highest memory address every reserved | |
| 2378 // by JVM. It is used to detect heap-stack collision if running with | |
| 2379 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
| 2380 // space than needed, it could confuse the collision detecting code. To | |
| 2381 // solve the problem, save current _highest_vm_reserved_address and | |
| 2382 // calculate the correct value before return. | |
| 2383 address old_highest = _highest_vm_reserved_address; | |
| 2384 | |
| 2385 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
| 2386 // if kernel honors the hint then we can return immediately. | |
| 2387 char * addr = anon_mmap(requested_addr, bytes, false); | |
| 2388 if (addr == requested_addr) { | |
| 2389 return requested_addr; | |
| 2390 } | |
| 2391 | |
| 2392 if (addr != NULL) { | |
| 2393 // mmap() is successful but it fails to reserve at the requested address | |
| 2394 anon_munmap(addr, bytes); | |
| 2395 } | |
| 2396 | |
| 2397 int i; | |
| 2398 for (i = 0; i < max_tries; ++i) { | |
| 2399 base[i] = reserve_memory(bytes); | |
| 2400 | |
| 2401 if (base[i] != NULL) { | |
| 2402 // Is this the block we wanted? | |
| 2403 if (base[i] == requested_addr) { | |
| 2404 size[i] = bytes; | |
| 2405 break; | |
| 2406 } | |
| 2407 | |
| 2408 // Does this overlap the block we wanted? Give back the overlapped | |
| 2409 // parts and try again. | |
| 2410 | |
| 2411 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
| 2412 if (top_overlap >= 0 && top_overlap < bytes) { | |
| 2413 unmap_memory(base[i], top_overlap); | |
| 2414 base[i] += top_overlap; | |
| 2415 size[i] = bytes - top_overlap; | |
| 2416 } else { | |
| 2417 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
| 2418 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
| 2419 unmap_memory(requested_addr, bottom_overlap); | |
| 2420 size[i] = bytes - bottom_overlap; | |
| 2421 } else { | |
| 2422 size[i] = bytes; | |
| 2423 } | |
| 2424 } | |
| 2425 } | |
| 2426 } | |
| 2427 | |
| 2428 // Give back the unused reserved pieces. | |
| 2429 | |
| 2430 for (int j = 0; j < i; ++j) { | |
| 2431 if (base[j] != NULL) { | |
| 2432 unmap_memory(base[j], size[j]); | |
| 2433 } | |
| 2434 } | |
| 2435 | |
| 2436 if (i < max_tries) { | |
| 2437 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
| 2438 return requested_addr; | |
| 2439 } else { | |
| 2440 _highest_vm_reserved_address = old_highest; | |
| 2441 return NULL; | |
| 2442 } | |
| 2443 } | |
| 2444 | |
| 2445 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 2446 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
| 2447 } | |
| 2448 | |
| 2449 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
| 2450 // Solaris uses poll(), bsd uses park(). | |
| 2451 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
| 2452 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
| 2453 // SIGSEGV, see 4355769. | |
| 2454 | |
| 2455 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
| 2456 assert(thread == Thread::current(), "thread consistency check"); | |
| 2457 | |
| 2458 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2459 slp->reset() ; | |
| 2460 OrderAccess::fence() ; | |
| 2461 | |
| 2462 if (interruptible) { | |
| 2463 jlong prevtime = javaTimeNanos(); | |
| 2464 | |
| 2465 for (;;) { | |
| 2466 if (os::is_interrupted(thread, true)) { | |
| 2467 return OS_INTRPT; | |
| 2468 } | |
| 2469 | |
| 2470 jlong newtime = javaTimeNanos(); | |
| 2471 | |
| 2472 if (newtime - prevtime < 0) { | |
| 2473 // time moving backwards, should only happen if no monotonic clock | |
| 2474 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2475 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2476 } else { | |
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2477 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2478 } |
| 2479 | |
| 2480 if(millis <= 0) { | |
| 2481 return OS_OK; | |
| 2482 } | |
| 2483 | |
| 2484 prevtime = newtime; | |
| 2485 | |
| 2486 { | |
| 2487 assert(thread->is_Java_thread(), "sanity check"); | |
| 2488 JavaThread *jt = (JavaThread *) thread; | |
| 2489 ThreadBlockInVM tbivm(jt); | |
| 2490 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
| 2491 | |
| 2492 jt->set_suspend_equivalent(); | |
| 2493 // cleared by handle_special_suspend_equivalent_condition() or | |
| 2494 // java_suspend_self() via check_and_wait_while_suspended() | |
| 2495 | |
| 2496 slp->park(millis); | |
| 2497 | |
| 2498 // were we externally suspended while we were waiting? | |
| 2499 jt->check_and_wait_while_suspended(); | |
| 2500 } | |
| 2501 } | |
| 2502 } else { | |
| 2503 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 2504 jlong prevtime = javaTimeNanos(); | |
| 2505 | |
| 2506 for (;;) { | |
| 2507 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
| 2508 // the 1st iteration ... | |
| 2509 jlong newtime = javaTimeNanos(); | |
| 2510 | |
| 2511 if (newtime - prevtime < 0) { | |
| 2512 // time moving backwards, should only happen if no monotonic clock | |
| 2513 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2514 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2515 } else { | |
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2516 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2517 } |
| 2518 | |
| 2519 if(millis <= 0) break ; | |
| 2520 | |
| 2521 prevtime = newtime; | |
| 2522 slp->park(millis); | |
| 2523 } | |
| 2524 return OS_OK ; | |
| 2525 } | |
| 2526 } | |
| 2527 | |
| 2528 int os::naked_sleep() { | |
| 2529 // %% make the sleep time an integer flag. for now use 1 millisec. | |
| 2530 return os::sleep(Thread::current(), 1, false); | |
| 2531 } | |
| 2532 | |
| 2533 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 2534 void os::infinite_sleep() { | |
| 2535 while (true) { // sleep forever ... | |
| 2536 ::sleep(100); // ... 100 seconds at a time | |
| 2537 } | |
| 2538 } | |
| 2539 | |
| 2540 // Used to convert frequent JVM_Yield() to nops | |
| 2541 bool os::dont_yield() { | |
| 2542 return DontYieldALot; | |
| 2543 } | |
| 2544 | |
| 2545 void os::yield() { | |
| 2546 sched_yield(); | |
| 2547 } | |
| 2548 | |
| 2549 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
| 2550 | |
| 2551 void os::yield_all(int attempts) { | |
| 2552 // Yields to all threads, including threads with lower priorities | |
| 2553 // Threads on Bsd are all with same priority. The Solaris style | |
| 2554 // os::yield_all() with nanosleep(1ms) is not necessary. | |
| 2555 sched_yield(); | |
| 2556 } | |
| 2557 | |
| 2558 // Called from the tight loops to possibly influence time-sharing heuristics | |
| 2559 void os::loop_breaker(int attempts) { | |
| 2560 os::yield_all(attempts); | |
| 2561 } | |
| 2562 | |
| 2563 //////////////////////////////////////////////////////////////////////////////// | |
| 2564 // thread priority support | |
| 2565 | |
| 2566 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
| 2567 // only supports dynamic priority, static priority must be zero. For real-time | |
| 2568 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
| 2569 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
| 2570 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
| 2571 // of 5 runs - Sep 2005). | |
| 2572 // | |
| 2573 // The following code actually changes the niceness of kernel-thread/LWP. It | |
| 2574 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
| 2575 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
| 2576 // threads. It has always been the case, but could change in the future. For | |
| 2577 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
| 2578 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
| 2579 | |
| 6918 | 2580 #if !defined(__APPLE__) |
|
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2581 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2582 19, // 0 Entry should never be used |
| 2583 | |
| 2584 0, // 1 MinPriority | |
| 2585 3, // 2 | |
| 2586 6, // 3 | |
| 2587 | |
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2588 10, // 4 |
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2589 15, // 5 NormPriority |
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2590 18, // 6 |
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2591 |
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2592 21, // 7 |
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2593 25, // 8 |
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2594 28, // 9 NearMaxPriority |
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2595 |
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2596 31, // 10 MaxPriority |
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2597 |
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2598 31 // 11 CriticalPriority |
| 3960 | 2599 }; |
| 6918 | 2600 #else |
| 3960 | 2601 /* Using Mach high-level priority assignments */ |
|
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2602 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2603 0, // 0 Entry should never be used (MINPRI_USER) |
| 2604 | |
| 2605 27, // 1 MinPriority | |
| 2606 28, // 2 | |
| 2607 29, // 3 | |
| 2608 | |
| 2609 30, // 4 | |
| 2610 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
| 2611 32, // 6 | |
| 2612 | |
| 2613 33, // 7 | |
| 2614 34, // 8 | |
| 2615 35, // 9 NearMaxPriority | |
| 2616 | |
|
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2617 36, // 10 MaxPriority |
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2618 |
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2619 36 // 11 CriticalPriority |
| 3960 | 2620 }; |
| 2621 #endif | |
| 2622 | |
| 2623 static int prio_init() { | |
| 2624 if (ThreadPriorityPolicy == 1) { | |
| 2625 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
| 2626 // if effective uid is not root. Perhaps, a more elegant way of doing | |
| 2627 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
| 2628 if (geteuid() != 0) { | |
| 2629 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
| 2630 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
| 2631 } | |
| 2632 ThreadPriorityPolicy = 0; | |
| 2633 } | |
| 2634 } | |
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2635 if (UseCriticalJavaThreadPriority) { |
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2636 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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2637 } |
| 3960 | 2638 return 0; |
| 2639 } | |
| 2640 | |
| 2641 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
| 2642 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
| 2643 | |
| 2644 #ifdef __OpenBSD__ | |
| 2645 // OpenBSD pthread_setprio starves low priority threads | |
| 2646 return OS_OK; | |
| 2647 #elif defined(__FreeBSD__) | |
| 2648 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
| 2649 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2650 struct sched_param sp; | |
| 2651 int policy; | |
| 2652 pthread_t self = pthread_self(); | |
| 2653 | |
| 2654 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
| 2655 return OS_ERR; | |
| 2656 | |
| 2657 sp.sched_priority = newpri; | |
| 2658 if (pthread_setschedparam(self, policy, &sp) != 0) | |
| 2659 return OS_ERR; | |
| 2660 | |
| 2661 return OS_OK; | |
| 2662 #else | |
| 2663 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
| 2664 return (ret == 0) ? OS_OK : OS_ERR; | |
| 2665 #endif | |
| 2666 } | |
| 2667 | |
| 2668 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
| 2669 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
| 2670 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 2671 return OS_OK; | |
| 2672 } | |
| 2673 | |
| 2674 errno = 0; | |
| 2675 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
| 2676 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
| 2677 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2678 int policy; | |
| 2679 struct sched_param sp; | |
| 2680 | |
| 2681 pthread_getschedparam(pthread_self(), &policy, &sp); | |
| 2682 *priority_ptr = sp.sched_priority; | |
| 2683 #else | |
| 2684 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
| 2685 #endif | |
| 2686 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
| 2687 } | |
| 2688 | |
| 2689 // Hint to the underlying OS that a task switch would not be good. | |
| 2690 // Void return because it's a hint and can fail. | |
| 2691 void os::hint_no_preempt() {} | |
| 2692 | |
| 2693 //////////////////////////////////////////////////////////////////////////////// | |
| 2694 // suspend/resume support | |
| 2695 | |
| 2696 // the low-level signal-based suspend/resume support is a remnant from the | |
| 2697 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
| 2698 // within hotspot. Now there is a single use-case for this: | |
| 2699 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
| 2700 // that runs in the watcher thread. | |
| 2701 // The remaining code is greatly simplified from the more general suspension | |
| 2702 // code that used to be used. | |
| 2703 // | |
| 2704 // The protocol is quite simple: | |
| 2705 // - suspend: | |
| 2706 // - sends a signal to the target thread | |
| 2707 // - polls the suspend state of the osthread using a yield loop | |
| 2708 // - target thread signal handler (SR_handler) sets suspend state | |
| 2709 // and blocks in sigsuspend until continued | |
| 2710 // - resume: | |
| 2711 // - sets target osthread state to continue | |
| 2712 // - sends signal to end the sigsuspend loop in the SR_handler | |
| 2713 // | |
| 2714 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
| 2715 // | |
| 2716 | |
| 2717 static void resume_clear_context(OSThread *osthread) { | |
| 2718 osthread->set_ucontext(NULL); | |
| 2719 osthread->set_siginfo(NULL); | |
| 2720 } | |
| 2721 | |
| 2722 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
| 2723 osthread->set_ucontext(context); | |
| 2724 osthread->set_siginfo(siginfo); | |
| 2725 } | |
| 2726 | |
| 2727 // | |
| 2728 // Handler function invoked when a thread's execution is suspended or | |
| 2729 // resumed. We have to be careful that only async-safe functions are | |
| 2730 // called here (Note: most pthread functions are not async safe and | |
| 2731 // should be avoided.) | |
| 2732 // | |
| 2733 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
| 2734 // interface point of view, but sigwait() prevents the signal hander | |
| 2735 // from being run. libpthread would get very confused by not having | |
| 2736 // its signal handlers run and prevents sigwait()'s use with the | |
| 2737 // mutex granting granting signal. | |
| 2738 // | |
| 10405 | 2739 // Currently only ever called on the VMThread or JavaThread |
| 3960 | 2740 // |
| 2741 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
| 2742 // Save and restore errno to avoid confusing native code with EINTR | |
| 2743 // after sigsuspend. | |
| 2744 int old_errno = errno; | |
| 2745 | |
| 2746 Thread* thread = Thread::current(); | |
| 2747 OSThread* osthread = thread->osthread(); | |
| 10405 | 2748 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
| 2749 | |
| 2750 os::SuspendResume::State current = osthread->sr.state(); | |
| 2751 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
| 3960 | 2752 suspend_save_context(osthread, siginfo, context); |
| 2753 | |
| 10405 | 2754 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
| 2755 os::SuspendResume::State state = osthread->sr.suspended(); | |
| 2756 if (state == os::SuspendResume::SR_SUSPENDED) { | |
| 2757 sigset_t suspend_set; // signals for sigsuspend() | |
| 2758 | |
| 2759 // get current set of blocked signals and unblock resume signal | |
| 2760 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
| 2761 sigdelset(&suspend_set, SR_signum); | |
| 2762 | |
| 2763 sr_semaphore.signal(); | |
| 2764 // wait here until we are resumed | |
| 2765 while (1) { | |
| 2766 sigsuspend(&suspend_set); | |
| 2767 | |
| 2768 os::SuspendResume::State result = osthread->sr.running(); | |
| 2769 if (result == os::SuspendResume::SR_RUNNING) { | |
| 2770 sr_semaphore.signal(); | |
| 2771 break; | |
| 2772 } else if (result != os::SuspendResume::SR_SUSPENDED) { | |
| 2773 ShouldNotReachHere(); | |
| 2774 } | |
| 2775 } | |
| 2776 | |
| 2777 } else if (state == os::SuspendResume::SR_RUNNING) { | |
| 2778 // request was cancelled, continue | |
| 2779 } else { | |
| 2780 ShouldNotReachHere(); | |
| 2781 } | |
| 3960 | 2782 |
| 2783 resume_clear_context(osthread); | |
| 10405 | 2784 } else if (current == os::SuspendResume::SR_RUNNING) { |
| 2785 // request was cancelled, continue | |
| 2786 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 2787 // ignore | |
| 3960 | 2788 } else { |
| 10405 | 2789 // ignore |
| 3960 | 2790 } |
| 2791 | |
| 2792 errno = old_errno; | |
| 2793 } | |
| 2794 | |
| 2795 | |
| 2796 static int SR_initialize() { | |
| 2797 struct sigaction act; | |
| 2798 char *s; | |
| 2799 /* Get signal number to use for suspend/resume */ | |
| 2800 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
| 2801 int sig = ::strtol(s, 0, 10); | |
| 2802 if (sig > 0 || sig < NSIG) { | |
| 2803 SR_signum = sig; | |
| 2804 } | |
| 2805 } | |
| 2806 | |
| 2807 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
| 2808 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
| 2809 | |
| 2810 sigemptyset(&SR_sigset); | |
| 2811 sigaddset(&SR_sigset, SR_signum); | |
| 2812 | |
| 2813 /* Set up signal handler for suspend/resume */ | |
| 2814 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 2815 act.sa_handler = (void (*)(int)) SR_handler; | |
| 2816 | |
| 2817 // SR_signum is blocked by default. | |
| 2818 // 4528190 - We also need to block pthread restart signal (32 on all | |
| 2819 // supported Bsd platforms). Note that BsdThreads need to block | |
| 2820 // this signal for all threads to work properly. So we don't have | |
| 2821 // to use hard-coded signal number when setting up the mask. | |
| 2822 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
| 2823 | |
| 2824 if (sigaction(SR_signum, &act, 0) == -1) { | |
| 2825 return -1; | |
| 2826 } | |
| 2827 | |
| 2828 // Save signal flag | |
| 2829 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
| 2830 return 0; | |
| 2831 } | |
| 2832 | |
| 10405 | 2833 static int sr_notify(OSThread* osthread) { |
| 2834 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 2835 assert_status(status == 0, status, "pthread_kill"); | |
| 2836 return status; | |
| 2837 } | |
| 2838 | |
| 2839 // "Randomly" selected value for how long we want to spin | |
| 2840 // before bailing out on suspending a thread, also how often | |
| 2841 // we send a signal to a thread we want to resume | |
| 2842 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
| 2843 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
| 3960 | 2844 |
| 2845 // returns true on success and false on error - really an error is fatal | |
| 2846 // but this seems the normal response to library errors | |
| 2847 static bool do_suspend(OSThread* osthread) { | |
| 10405 | 2848 assert(osthread->sr.is_running(), "thread should be running"); |
| 2849 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
| 2850 | |
| 3960 | 2851 // mark as suspended and send signal |
| 10405 | 2852 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
| 2853 // failed to switch, state wasn't running? | |
| 2854 ShouldNotReachHere(); | |
| 3960 | 2855 return false; |
| 2856 } | |
| 10405 | 2857 |
| 2858 if (sr_notify(osthread) != 0) { | |
| 2859 ShouldNotReachHere(); | |
| 2860 } | |
| 2861 | |
| 2862 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
| 2863 while (true) { | |
| 2864 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 2865 break; | |
| 2866 } else { | |
| 2867 // timeout | |
| 2868 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
| 2869 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
| 2870 return false; | |
| 2871 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
| 2872 // make sure that we consume the signal on the semaphore as well | |
| 2873 sr_semaphore.wait(); | |
| 2874 break; | |
| 2875 } else { | |
| 2876 ShouldNotReachHere(); | |
| 2877 return false; | |
| 2878 } | |
| 2879 } | |
| 2880 } | |
| 2881 | |
| 2882 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
| 2883 return true; | |
| 3960 | 2884 } |
| 2885 | |
| 2886 static void do_resume(OSThread* osthread) { | |
| 2887 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
| 10405 | 2888 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
| 2889 | |
| 2890 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 2891 // failed to switch to WAKEUP_REQUEST | |
| 2892 ShouldNotReachHere(); | |
| 2893 return; | |
| 2894 } | |
| 2895 | |
| 2896 while (true) { | |
| 2897 if (sr_notify(osthread) == 0) { | |
| 2898 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 2899 if (osthread->sr.is_running()) { | |
| 2900 return; | |
| 2901 } | |
| 2902 } | |
| 2903 } else { | |
| 2904 ShouldNotReachHere(); | |
| 3960 | 2905 } |
| 2906 } | |
| 10405 | 2907 |
| 2908 guarantee(osthread->sr.is_running(), "Must be running!"); | |
| 3960 | 2909 } |
| 2910 | |
| 2911 //////////////////////////////////////////////////////////////////////////////// | |
| 2912 // interrupt support | |
| 2913 | |
| 2914 void os::interrupt(Thread* thread) { | |
| 2915 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2916 "possibility of dangling Thread pointer"); | |
| 2917 | |
| 2918 OSThread* osthread = thread->osthread(); | |
| 2919 | |
| 2920 if (!osthread->interrupted()) { | |
| 2921 osthread->set_interrupted(true); | |
| 2922 // More than one thread can get here with the same value of osthread, | |
| 2923 // resulting in multiple notifications. We do, however, want the store | |
| 2924 // to interrupted() to be visible to other threads before we execute unpark(). | |
| 2925 OrderAccess::fence(); | |
| 2926 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2927 if (slp != NULL) slp->unpark() ; | |
| 2928 } | |
| 2929 | |
| 2930 // For JSR166. Unpark even if interrupt status already was set | |
| 2931 if (thread->is_Java_thread()) | |
| 2932 ((JavaThread*)thread)->parker()->unpark(); | |
| 2933 | |
| 2934 ParkEvent * ev = thread->_ParkEvent ; | |
| 2935 if (ev != NULL) ev->unpark() ; | |
| 2936 | |
| 2937 } | |
| 2938 | |
| 2939 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 2940 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2941 "possibility of dangling Thread pointer"); | |
| 2942 | |
| 2943 OSThread* osthread = thread->osthread(); | |
| 2944 | |
| 2945 bool interrupted = osthread->interrupted(); | |
| 2946 | |
| 2947 if (interrupted && clear_interrupted) { | |
| 2948 osthread->set_interrupted(false); | |
| 2949 // consider thread->_SleepEvent->reset() ... optional optimization | |
| 2950 } | |
| 2951 | |
| 2952 return interrupted; | |
| 2953 } | |
| 2954 | |
| 2955 /////////////////////////////////////////////////////////////////////////////////// | |
| 2956 // signal handling (except suspend/resume) | |
| 2957 | |
| 2958 // This routine may be used by user applications as a "hook" to catch signals. | |
| 2959 // The user-defined signal handler must pass unrecognized signals to this | |
| 2960 // routine, and if it returns true (non-zero), then the signal handler must | |
| 2961 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
| 2962 // routine will never retun false (zero), but instead will execute a VM panic | |
| 2963 // routine kill the process. | |
| 2964 // | |
| 2965 // If this routine returns false, it is OK to call it again. This allows | |
| 2966 // the user-defined signal handler to perform checks either before or after | |
| 2967 // the VM performs its own checks. Naturally, the user code would be making | |
| 2968 // a serious error if it tried to handle an exception (such as a null check | |
| 2969 // or breakpoint) that the VM was generating for its own correct operation. | |
| 2970 // | |
| 2971 // This routine may recognize any of the following kinds of signals: | |
| 2972 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
| 2973 // It should be consulted by handlers for any of those signals. | |
| 2974 // | |
| 2975 // The caller of this routine must pass in the three arguments supplied | |
| 2976 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
| 2977 // field of the structure passed to sigaction(). This routine assumes that | |
| 2978 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
| 2979 // | |
| 2980 // Note that the VM will print warnings if it detects conflicting signal | |
| 2981 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
| 2982 // | |
| 2983 extern "C" JNIEXPORT int | |
| 2984 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
| 2985 void* ucontext, int abort_if_unrecognized); | |
| 2986 | |
| 2987 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
| 2988 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
| 8067 | 2989 int orig_errno = errno; // Preserve errno value over signal handler. |
| 3960 | 2990 JVM_handle_bsd_signal(sig, info, uc, true); |
| 8067 | 2991 errno = orig_errno; |
| 3960 | 2992 } |
| 2993 | |
| 2994 | |
| 2995 // This boolean allows users to forward their own non-matching signals | |
| 2996 // to JVM_handle_bsd_signal, harmlessly. | |
| 2997 bool os::Bsd::signal_handlers_are_installed = false; | |
| 2998 | |
| 2999 // For signal-chaining | |
| 3000 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
| 3001 unsigned int os::Bsd::sigs = 0; | |
| 3002 bool os::Bsd::libjsig_is_loaded = false; | |
| 3003 typedef struct sigaction *(*get_signal_t)(int); | |
| 3004 get_signal_t os::Bsd::get_signal_action = NULL; | |
| 3005 | |
| 3006 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
| 3007 struct sigaction *actp = NULL; | |
| 3008 | |
| 3009 if (libjsig_is_loaded) { | |
| 3010 // Retrieve the old signal handler from libjsig | |
| 3011 actp = (*get_signal_action)(sig); | |
| 3012 } | |
| 3013 if (actp == NULL) { | |
| 3014 // Retrieve the preinstalled signal handler from jvm | |
| 3015 actp = get_preinstalled_handler(sig); | |
| 3016 } | |
| 3017 | |
| 3018 return actp; | |
| 3019 } | |
| 3020 | |
| 3021 static bool call_chained_handler(struct sigaction *actp, int sig, | |
| 3022 siginfo_t *siginfo, void *context) { | |
| 3023 // Call the old signal handler | |
| 3024 if (actp->sa_handler == SIG_DFL) { | |
| 3025 // It's more reasonable to let jvm treat it as an unexpected exception | |
| 3026 // instead of taking the default action. | |
| 3027 return false; | |
| 3028 } else if (actp->sa_handler != SIG_IGN) { | |
| 3029 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
| 3030 // automaticlly block the signal | |
| 3031 sigaddset(&(actp->sa_mask), sig); | |
| 3032 } | |
| 3033 | |
| 3034 sa_handler_t hand; | |
| 3035 sa_sigaction_t sa; | |
| 3036 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
| 3037 // retrieve the chained handler | |
| 3038 if (siginfo_flag_set) { | |
| 3039 sa = actp->sa_sigaction; | |
| 3040 } else { | |
| 3041 hand = actp->sa_handler; | |
| 3042 } | |
| 3043 | |
| 3044 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
| 3045 actp->sa_handler = SIG_DFL; | |
| 3046 } | |
| 3047 | |
| 3048 // try to honor the signal mask | |
| 3049 sigset_t oset; | |
| 3050 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
| 3051 | |
| 3052 // call into the chained handler | |
| 3053 if (siginfo_flag_set) { | |
| 3054 (*sa)(sig, siginfo, context); | |
| 3055 } else { | |
| 3056 (*hand)(sig); | |
| 3057 } | |
| 3058 | |
| 3059 // restore the signal mask | |
| 3060 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
| 3061 } | |
| 3062 // Tell jvm's signal handler the signal is taken care of. | |
| 3063 return true; | |
| 3064 } | |
| 3065 | |
| 3066 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
| 3067 bool chained = false; | |
| 3068 // signal-chaining | |
| 3069 if (UseSignalChaining) { | |
| 3070 struct sigaction *actp = get_chained_signal_action(sig); | |
| 3071 if (actp != NULL) { | |
| 3072 chained = call_chained_handler(actp, sig, siginfo, context); | |
| 3073 } | |
| 3074 } | |
| 3075 return chained; | |
| 3076 } | |
| 3077 | |
| 3078 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
| 3079 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
| 3080 return &sigact[sig]; | |
| 3081 } | |
| 3082 return NULL; | |
| 3083 } | |
| 3084 | |
| 3085 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
| 3086 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3087 sigact[sig] = oldAct; | |
| 3088 sigs |= (unsigned int)1 << sig; | |
| 3089 } | |
| 3090 | |
| 3091 // for diagnostic | |
| 3092 int os::Bsd::sigflags[MAXSIGNUM]; | |
| 3093 | |
| 3094 int os::Bsd::get_our_sigflags(int sig) { | |
| 3095 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3096 return sigflags[sig]; | |
| 3097 } | |
| 3098 | |
| 3099 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
| 3100 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3101 sigflags[sig] = flags; | |
| 3102 } | |
| 3103 | |
| 3104 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
| 3105 // Check for overwrite. | |
| 3106 struct sigaction oldAct; | |
| 3107 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
| 3108 | |
| 3109 void* oldhand = oldAct.sa_sigaction | |
| 3110 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 3111 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 3112 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
| 3113 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
| 3114 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
| 3115 if (AllowUserSignalHandlers || !set_installed) { | |
| 3116 // Do not overwrite; user takes responsibility to forward to us. | |
| 3117 return; | |
| 3118 } else if (UseSignalChaining) { | |
| 3119 // save the old handler in jvm | |
| 3120 save_preinstalled_handler(sig, oldAct); | |
| 3121 // libjsig also interposes the sigaction() call below and saves the | |
| 3122 // old sigaction on it own. | |
| 3123 } else { | |
| 3124 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
| 3125 "%#lx for signal %d.", (long)oldhand, sig)); | |
| 3126 } | |
| 3127 } | |
| 3128 | |
| 3129 struct sigaction sigAct; | |
| 3130 sigfillset(&(sigAct.sa_mask)); | |
| 3131 sigAct.sa_handler = SIG_DFL; | |
| 3132 if (!set_installed) { | |
| 3133 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3134 } else { | |
| 3135 sigAct.sa_sigaction = signalHandler; | |
| 3136 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3137 } | |
|
10386
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3138 #if __APPLE__ |
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3139 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV |
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3140 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" |
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3141 // if the signal handler declares it will handle it on alternate stack. |
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3142 // Notice we only declare we will handle it on alt stack, but we are not |
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3143 // actually going to use real alt stack - this is just a workaround. |
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3144 // Please see ux_exception.c, method catch_mach_exception_raise for details |
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3145 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c |
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3146 if (sig == SIGSEGV) { |
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3147 sigAct.sa_flags |= SA_ONSTACK; |
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3148 } |
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3149 #endif |
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3150 |
| 3960 | 3151 // Save flags, which are set by ours |
| 3152 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3153 sigflags[sig] = sigAct.sa_flags; | |
| 3154 | |
| 3155 int ret = sigaction(sig, &sigAct, &oldAct); | |
| 3156 assert(ret == 0, "check"); | |
| 3157 | |
| 3158 void* oldhand2 = oldAct.sa_sigaction | |
| 3159 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 3160 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 3161 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
| 3162 } | |
| 3163 | |
| 3164 // install signal handlers for signals that HotSpot needs to | |
| 3165 // handle in order to support Java-level exception handling. | |
| 3166 | |
| 3167 void os::Bsd::install_signal_handlers() { | |
| 3168 if (!signal_handlers_are_installed) { | |
| 3169 signal_handlers_are_installed = true; | |
| 3170 | |
| 3171 // signal-chaining | |
| 3172 typedef void (*signal_setting_t)(); | |
| 3173 signal_setting_t begin_signal_setting = NULL; | |
| 3174 signal_setting_t end_signal_setting = NULL; | |
| 3175 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3176 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
| 3177 if (begin_signal_setting != NULL) { | |
| 3178 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3179 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
| 3180 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
| 3181 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
| 3182 libjsig_is_loaded = true; | |
| 3183 assert(UseSignalChaining, "should enable signal-chaining"); | |
| 3184 } | |
| 3185 if (libjsig_is_loaded) { | |
| 3186 // Tell libjsig jvm is setting signal handlers | |
| 3187 (*begin_signal_setting)(); | |
| 3188 } | |
| 3189 | |
| 3190 set_signal_handler(SIGSEGV, true); | |
| 3191 set_signal_handler(SIGPIPE, true); | |
| 3192 set_signal_handler(SIGBUS, true); | |
| 3193 set_signal_handler(SIGILL, true); | |
| 3194 set_signal_handler(SIGFPE, true); | |
| 3195 set_signal_handler(SIGXFSZ, true); | |
| 3196 | |
| 3197 #if defined(__APPLE__) | |
| 3198 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
| 3199 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
| 3200 // signal handler that's placed on our process by CrashReporter. This disables | |
| 3201 // CrashReporter-based reporting. | |
| 3202 // | |
| 3203 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
| 3204 // on caught fatal signals. | |
| 3205 // | |
| 3206 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
| 3207 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
| 3208 // exception handling, while leaving the standard BSD signal handlers functional. | |
| 3209 kern_return_t kr; | |
| 3210 kr = task_set_exception_ports(mach_task_self(), | |
| 3211 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
| 3212 MACH_PORT_NULL, | |
| 3213 EXCEPTION_STATE_IDENTITY, | |
| 3214 MACHINE_THREAD_STATE); | |
| 3215 | |
| 3216 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
| 3217 #endif | |
| 3218 | |
| 3219 if (libjsig_is_loaded) { | |
| 3220 // Tell libjsig jvm finishes setting signal handlers | |
| 3221 (*end_signal_setting)(); | |
| 3222 } | |
| 3223 | |
| 3224 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
| 3225 // and if UserSignalHandler is installed all bets are off | |
| 3226 if (CheckJNICalls) { | |
| 3227 if (libjsig_is_loaded) { | |
| 3228 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
| 3229 check_signals = false; | |
| 3230 } | |
| 3231 if (AllowUserSignalHandlers) { | |
| 3232 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
| 3233 check_signals = false; | |
| 3234 } | |
| 3235 } | |
| 3236 } | |
| 3237 } | |
| 3238 | |
| 3239 | |
| 3240 ///// | |
| 3241 // glibc on Bsd platform uses non-documented flag | |
| 3242 // to indicate, that some special sort of signal | |
| 3243 // trampoline is used. | |
| 3244 // We will never set this flag, and we should | |
| 3245 // ignore this flag in our diagnostic | |
| 3246 #ifdef SIGNIFICANT_SIGNAL_MASK | |
| 3247 #undef SIGNIFICANT_SIGNAL_MASK | |
| 3248 #endif | |
| 3249 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
| 3250 | |
| 3251 static const char* get_signal_handler_name(address handler, | |
| 3252 char* buf, int buflen) { | |
| 3253 int offset; | |
| 3254 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
| 3255 if (found) { | |
| 3256 // skip directory names | |
| 3257 const char *p1, *p2; | |
| 3258 p1 = buf; | |
| 3259 size_t len = strlen(os::file_separator()); | |
| 3260 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
| 3261 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
| 3262 } else { | |
| 3263 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
| 3264 } | |
| 3265 return buf; | |
| 3266 } | |
| 3267 | |
| 3268 static void print_signal_handler(outputStream* st, int sig, | |
| 3269 char* buf, size_t buflen) { | |
| 3270 struct sigaction sa; | |
| 3271 | |
| 3272 sigaction(sig, NULL, &sa); | |
| 3273 | |
| 3274 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
| 3275 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3276 | |
| 3277 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
| 3278 | |
| 3279 address handler = (sa.sa_flags & SA_SIGINFO) | |
| 3280 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 3281 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 3282 | |
| 3283 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
| 3284 st->print("SIG_DFL"); | |
| 3285 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
| 3286 st->print("SIG_IGN"); | |
| 3287 } else { | |
| 3288 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
| 3289 } | |
| 3290 | |
| 3291 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
| 3292 | |
| 3293 address rh = VMError::get_resetted_sighandler(sig); | |
| 3294 // May be, handler was resetted by VMError? | |
| 3295 if(rh != NULL) { | |
| 3296 handler = rh; | |
| 3297 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
| 3298 } | |
| 3299 | |
| 3300 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
| 3301 | |
| 3302 // Check: is it our handler? | |
| 3303 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
| 3304 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
| 3305 // It is our signal handler | |
| 3306 // check for flags, reset system-used one! | |
| 3307 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3308 st->print( | |
| 3309 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
| 3310 os::Bsd::get_our_sigflags(sig)); | |
| 3311 } | |
| 3312 } | |
| 3313 st->cr(); | |
| 3314 } | |
| 3315 | |
| 3316 | |
| 3317 #define DO_SIGNAL_CHECK(sig) \ | |
| 3318 if (!sigismember(&check_signal_done, sig)) \ | |
| 3319 os::Bsd::check_signal_handler(sig) | |
| 3320 | |
| 3321 // This method is a periodic task to check for misbehaving JNI applications | |
| 3322 // under CheckJNI, we can add any periodic checks here | |
| 3323 | |
| 3324 void os::run_periodic_checks() { | |
| 3325 | |
| 3326 if (check_signals == false) return; | |
| 3327 | |
| 3328 // SEGV and BUS if overridden could potentially prevent | |
| 3329 // generation of hs*.log in the event of a crash, debugging | |
| 3330 // such a case can be very challenging, so we absolutely | |
| 3331 // check the following for a good measure: | |
| 3332 DO_SIGNAL_CHECK(SIGSEGV); | |
| 3333 DO_SIGNAL_CHECK(SIGILL); | |
| 3334 DO_SIGNAL_CHECK(SIGFPE); | |
| 3335 DO_SIGNAL_CHECK(SIGBUS); | |
| 3336 DO_SIGNAL_CHECK(SIGPIPE); | |
| 3337 DO_SIGNAL_CHECK(SIGXFSZ); | |
| 3338 | |
| 3339 | |
| 3340 // ReduceSignalUsage allows the user to override these handlers | |
| 3341 // see comments at the very top and jvm_solaris.h | |
| 3342 if (!ReduceSignalUsage) { | |
| 3343 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
| 3344 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
| 3345 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
| 3346 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
| 3347 } | |
| 3348 | |
| 3349 DO_SIGNAL_CHECK(SR_signum); | |
| 3350 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
| 3351 } | |
| 3352 | |
| 3353 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
| 3354 | |
| 3355 static os_sigaction_t os_sigaction = NULL; | |
| 3356 | |
| 3357 void os::Bsd::check_signal_handler(int sig) { | |
| 3358 char buf[O_BUFLEN]; | |
| 3359 address jvmHandler = NULL; | |
| 3360 | |
| 3361 | |
| 3362 struct sigaction act; | |
| 3363 if (os_sigaction == NULL) { | |
| 3364 // only trust the default sigaction, in case it has been interposed | |
| 3365 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
| 3366 if (os_sigaction == NULL) return; | |
| 3367 } | |
| 3368 | |
| 3369 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
| 3370 | |
| 3371 | |
| 3372 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3373 | |
| 3374 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
| 3375 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
| 3376 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
| 3377 | |
| 3378 | |
| 3379 switch(sig) { | |
| 3380 case SIGSEGV: | |
| 3381 case SIGBUS: | |
| 3382 case SIGFPE: | |
| 3383 case SIGPIPE: | |
| 3384 case SIGILL: | |
| 3385 case SIGXFSZ: | |
| 3386 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
| 3387 break; | |
| 3388 | |
| 3389 case SHUTDOWN1_SIGNAL: | |
| 3390 case SHUTDOWN2_SIGNAL: | |
| 3391 case SHUTDOWN3_SIGNAL: | |
| 3392 case BREAK_SIGNAL: | |
| 3393 jvmHandler = (address)user_handler(); | |
| 3394 break; | |
| 3395 | |
| 3396 case INTERRUPT_SIGNAL: | |
| 3397 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
| 3398 break; | |
| 3399 | |
| 3400 default: | |
| 3401 if (sig == SR_signum) { | |
| 3402 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
| 3403 } else { | |
| 3404 return; | |
| 3405 } | |
| 3406 break; | |
| 3407 } | |
| 3408 | |
| 3409 if (thisHandler != jvmHandler) { | |
| 3410 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
| 3411 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
| 3412 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
| 3413 // No need to check this sig any longer | |
| 3414 sigaddset(&check_signal_done, sig); | |
| 3415 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3416 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
| 3417 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
| 3418 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
| 3419 // No need to check this sig any longer | |
| 3420 sigaddset(&check_signal_done, sig); | |
| 3421 } | |
| 3422 | |
| 3423 // Dump all the signal | |
| 3424 if (sigismember(&check_signal_done, sig)) { | |
| 3425 print_signal_handlers(tty, buf, O_BUFLEN); | |
| 3426 } | |
| 3427 } | |
| 3428 | |
| 3429 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
| 3430 | |
| 3431 extern bool signal_name(int signo, char* buf, size_t len); | |
| 3432 | |
| 3433 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
| 3434 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
| 3435 // signal | |
| 3436 if (!signal_name(exception_code, buf, size)) { | |
| 3437 jio_snprintf(buf, size, "SIG%d", exception_code); | |
| 3438 } | |
| 3439 return buf; | |
| 3440 } else { | |
| 3441 return NULL; | |
| 3442 } | |
| 3443 } | |
| 3444 | |
| 3445 // this is called _before_ the most of global arguments have been parsed | |
| 3446 void os::init(void) { | |
| 3447 char dummy; /* used to get a guess on initial stack address */ | |
| 3448 // first_hrtime = gethrtime(); | |
| 3449 | |
| 3450 // With BsdThreads the JavaMain thread pid (primordial thread) | |
| 3451 // is different than the pid of the java launcher thread. | |
| 3452 // So, on Bsd, the launcher thread pid is passed to the VM | |
| 3453 // via the sun.java.launcher.pid property. | |
| 3454 // Use this property instead of getpid() if it was correctly passed. | |
| 3455 // See bug 6351349. | |
| 3456 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
| 3457 | |
| 3458 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
| 3459 | |
| 3460 clock_tics_per_sec = CLK_TCK; | |
| 3461 | |
| 3462 init_random(1234567); | |
| 3463 | |
| 3464 ThreadCritical::initialize(); | |
| 3465 | |
| 3466 Bsd::set_page_size(getpagesize()); | |
| 3467 if (Bsd::page_size() == -1) { | |
| 3468 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
| 3469 strerror(errno))); | |
| 3470 } | |
| 3471 init_page_sizes((size_t) Bsd::page_size()); | |
| 3472 | |
| 3473 Bsd::initialize_system_info(); | |
| 3474 | |
| 3475 // main_thread points to the aboriginal thread | |
| 3476 Bsd::_main_thread = pthread_self(); | |
| 3477 | |
| 3478 Bsd::clock_init(); | |
| 3479 initial_time_count = os::elapsed_counter(); | |
| 3480 | |
| 3481 #ifdef __APPLE__ | |
| 3482 // XXXDARWIN | |
| 3483 // Work around the unaligned VM callbacks in hotspot's | |
| 3484 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
| 3485 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
| 3486 // alignment when doing symbol lookup. To work around this, we force early | |
| 3487 // binding of all symbols now, thus binding when alignment is known-good. | |
| 3488 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
| 3489 #endif | |
| 3490 } | |
| 3491 | |
| 3492 // To install functions for atexit system call | |
| 3493 extern "C" { | |
| 3494 static void perfMemory_exit_helper() { | |
| 3495 perfMemory_exit(); | |
| 3496 } | |
| 3497 } | |
| 3498 | |
| 3499 // this is called _after_ the global arguments have been parsed | |
| 3500 jint os::init_2(void) | |
| 3501 { | |
| 3502 // Allocate a single page and mark it as readable for safepoint polling | |
| 3503 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 3504 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
| 3505 | |
| 3506 os::set_polling_page( polling_page ); | |
| 3507 | |
| 3508 #ifndef PRODUCT | |
| 3509 if(Verbose && PrintMiscellaneous) | |
| 3510 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 3511 #endif | |
| 3512 | |
| 3513 if (!UseMembar) { | |
| 3514 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 3515 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
| 3516 os::set_memory_serialize_page( mem_serialize_page ); | |
| 3517 | |
| 3518 #ifndef PRODUCT | |
| 3519 if(Verbose && PrintMiscellaneous) | |
| 3520 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 3521 #endif | |
| 3522 } | |
| 3523 | |
| 3524 os::large_page_init(); | |
| 3525 | |
| 3526 // initialize suspend/resume support - must do this before signal_sets_init() | |
| 3527 if (SR_initialize() != 0) { | |
| 3528 perror("SR_initialize failed"); | |
| 3529 return JNI_ERR; | |
| 3530 } | |
| 3531 | |
| 3532 Bsd::signal_sets_init(); | |
| 3533 Bsd::install_signal_handlers(); | |
| 3534 | |
| 3535 // Check minimum allowable stack size for thread creation and to initialize | |
| 3536 // the java system classes, including StackOverflowError - depends on page | |
| 3537 // size. Add a page for compiler2 recursion in main thread. | |
| 3538 // Add in 2*BytesPerWord times page size to account for VM stack during | |
| 3539 // class initialization depending on 32 or 64 bit VM. | |
| 3540 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
| 3541 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
| 3542 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
| 3543 | |
| 3544 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
| 3545 if (threadStackSizeInBytes != 0 && | |
| 3546 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
| 3547 tty->print_cr("\nThe stack size specified is too small, " | |
| 3548 "Specify at least %dk", | |
| 3549 os::Bsd::min_stack_allowed/ K); | |
| 3550 return JNI_ERR; | |
| 3551 } | |
| 3552 | |
| 3553 // Make the stack size a multiple of the page size so that | |
| 3554 // the yellow/red zones can be guarded. | |
| 3555 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
| 3556 vm_page_size())); | |
| 3557 | |
| 3558 if (MaxFDLimit) { | |
| 3559 // set the number of file descriptors to max. print out error | |
| 3560 // if getrlimit/setrlimit fails but continue regardless. | |
| 3561 struct rlimit nbr_files; | |
| 3562 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3563 if (status != 0) { | |
| 3564 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3565 perror("os::init_2 getrlimit failed"); | |
| 3566 } else { | |
| 3567 nbr_files.rlim_cur = nbr_files.rlim_max; | |
| 3568 | |
| 3569 #ifdef __APPLE__ | |
| 3570 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
| 3571 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
| 3572 // be used instead | |
| 3573 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
| 3574 #endif | |
| 3575 | |
| 3576 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3577 if (status != 0) { | |
| 3578 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3579 perror("os::init_2 setrlimit failed"); | |
| 3580 } | |
| 3581 } | |
| 3582 } | |
| 3583 | |
| 3584 // at-exit methods are called in the reverse order of their registration. | |
| 3585 // atexit functions are called on return from main or as a result of a | |
| 3586 // call to exit(3C). There can be only 32 of these functions registered | |
| 3587 // and atexit() does not set errno. | |
| 3588 | |
| 3589 if (PerfAllowAtExitRegistration) { | |
| 3590 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 3591 // atexit functions can be delayed until process exit time, which | |
| 3592 // can be problematic for embedded VM situations. Embedded VMs should | |
| 3593 // call DestroyJavaVM() to assure that VM resources are released. | |
| 3594 | |
| 3595 // note: perfMemory_exit_helper atexit function may be removed in | |
| 3596 // the future if the appropriate cleanup code can be added to the | |
| 3597 // VM_Exit VMOperation's doit method. | |
| 3598 if (atexit(perfMemory_exit_helper) != 0) { | |
| 3599 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
| 3600 } | |
| 3601 } | |
| 3602 | |
| 3603 // initialize thread priority policy | |
| 3604 prio_init(); | |
| 3605 | |
| 4006 | 3606 #ifdef __APPLE__ |
| 3607 // dynamically link to objective c gc registration | |
| 3608 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
| 3609 if (handleLibObjc != NULL) { | |
| 3610 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
| 3611 } | |
| 3612 #endif | |
| 3613 | |
| 3960 | 3614 return JNI_OK; |
| 3615 } | |
| 3616 | |
| 3617 // this is called at the end of vm_initialization | |
| 3618 void os::init_3(void) { } | |
| 3619 | |
| 3620 // Mark the polling page as unreadable | |
| 3621 void os::make_polling_page_unreadable(void) { | |
| 3622 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
| 3623 fatal("Could not disable polling page"); | |
| 3624 }; | |
| 3625 | |
| 3626 // Mark the polling page as readable | |
| 3627 void os::make_polling_page_readable(void) { | |
| 3628 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
| 3629 fatal("Could not enable polling page"); | |
| 3630 } | |
| 3631 }; | |
| 3632 | |
| 3633 int os::active_processor_count() { | |
| 3634 return _processor_count; | |
| 3635 } | |
| 3636 | |
| 4006 | 3637 void os::set_native_thread_name(const char *name) { |
| 3638 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
| 3639 // This is only supported in Snow Leopard and beyond | |
| 3640 if (name != NULL) { | |
| 3641 // Add a "Java: " prefix to the name | |
| 3642 char buf[MAXTHREADNAMESIZE]; | |
| 3643 snprintf(buf, sizeof(buf), "Java: %s", name); | |
| 3644 pthread_setname_np(buf); | |
| 3645 } | |
| 3646 #endif | |
| 3647 } | |
| 3648 | |
| 3960 | 3649 bool os::distribute_processes(uint length, uint* distribution) { |
| 3650 // Not yet implemented. | |
| 3651 return false; | |
| 3652 } | |
| 3653 | |
| 3654 bool os::bind_to_processor(uint processor_id) { | |
| 3655 // Not yet implemented. | |
| 3656 return false; | |
| 3657 } | |
| 3658 | |
| 10405 | 3659 void os::SuspendedThreadTask::internal_do_task() { |
| 3660 if (do_suspend(_thread->osthread())) { | |
| 3661 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
| 3662 do_task(context); | |
| 3663 do_resume(_thread->osthread()); | |
| 3664 } | |
| 3665 } | |
| 3666 | |
| 3960 | 3667 /// |
| 10405 | 3668 class PcFetcher : public os::SuspendedThreadTask { |
| 3669 public: | |
| 3670 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
| 3671 ExtendedPC result(); | |
| 3672 protected: | |
| 3673 void do_task(const os::SuspendedThreadTaskContext& context); | |
| 3674 private: | |
| 3675 ExtendedPC _epc; | |
| 3676 }; | |
| 3677 | |
| 3678 ExtendedPC PcFetcher::result() { | |
| 3679 guarantee(is_done(), "task is not done yet."); | |
| 3680 return _epc; | |
| 3681 } | |
| 3682 | |
| 3683 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
| 3684 Thread* thread = context.thread(); | |
| 3685 OSThread* osthread = thread->osthread(); | |
| 3686 if (osthread->ucontext() != NULL) { | |
| 3687 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
| 3688 } else { | |
| 3689 // NULL context is unexpected, double-check this is the VMThread | |
| 3690 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
| 3691 } | |
| 3692 } | |
| 3960 | 3693 |
| 3694 // Suspends the target using the signal mechanism and then grabs the PC before | |
| 3695 // resuming the target. Used by the flat-profiler only | |
| 3696 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 3697 // Make sure that it is called by the watcher for the VMThread | |
| 3698 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
| 3699 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
| 3700 | |
| 10405 | 3701 PcFetcher fetcher(thread); |
| 3702 fetcher.run(); | |
| 3703 return fetcher.result(); | |
| 3960 | 3704 } |
| 3705 | |
| 3706 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
| 3707 { | |
| 3708 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 3709 } | |
| 3710 | |
| 3711 //////////////////////////////////////////////////////////////////////////////// | |
| 3712 // debug support | |
| 3713 | |
| 3714 bool os::find(address addr, outputStream* st) { | |
| 3715 Dl_info dlinfo; | |
| 3716 memset(&dlinfo, 0, sizeof(dlinfo)); | |
| 3717 if (dladdr(addr, &dlinfo)) { | |
| 3718 st->print(PTR_FORMAT ": ", addr); | |
| 3719 if (dlinfo.dli_sname != NULL) { | |
| 3720 st->print("%s+%#x", dlinfo.dli_sname, | |
| 3721 addr - (intptr_t)dlinfo.dli_saddr); | |
| 3722 } else if (dlinfo.dli_fname) { | |
| 3723 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); | |
| 3724 } else { | |
| 3725 st->print("<absolute address>"); | |
| 3726 } | |
| 3727 if (dlinfo.dli_fname) { | |
| 3728 st->print(" in %s", dlinfo.dli_fname); | |
| 3729 } | |
| 3730 if (dlinfo.dli_fbase) { | |
| 3731 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); | |
| 3732 } | |
| 3733 st->cr(); | |
| 3734 | |
| 3735 if (Verbose) { | |
| 3736 // decode some bytes around the PC | |
|
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9059
diff
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|
3737 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
|
cc32ccaaf47f
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diff
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|
3738 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
| 3960 | 3739 address lowest = (address) dlinfo.dli_sname; |
| 3740 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
| 3741 if (begin < lowest) begin = lowest; | |
| 3742 Dl_info dlinfo2; | |
| 3743 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
| 3744 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
| 3745 end = (address) dlinfo2.dli_saddr; | |
| 3746 Disassembler::decode(begin, end, st); | |
| 3747 } | |
| 3748 return true; | |
| 3749 } | |
| 3750 return false; | |
| 3751 } | |
| 3752 | |
| 3753 //////////////////////////////////////////////////////////////////////////////// | |
| 3754 // misc | |
| 3755 | |
| 3756 // This does not do anything on Bsd. This is basically a hook for being | |
| 3757 // able to use structured exception handling (thread-local exception filters) | |
| 3758 // on, e.g., Win32. | |
| 3759 void | |
| 3760 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
| 3761 JavaCallArguments* args, Thread* thread) { | |
| 3762 f(value, method, args, thread); | |
| 3763 } | |
| 3764 | |
| 3765 void os::print_statistics() { | |
| 3766 } | |
| 3767 | |
| 3768 int os::message_box(const char* title, const char* message) { | |
| 3769 int i; | |
| 3770 fdStream err(defaultStream::error_fd()); | |
| 3771 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3772 err.cr(); | |
| 3773 err.print_raw_cr(title); | |
| 3774 for (i = 0; i < 78; i++) err.print_raw("-"); | |
| 3775 err.cr(); | |
| 3776 err.print_raw_cr(message); | |
| 3777 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3778 err.cr(); | |
| 3779 | |
| 3780 char buf[16]; | |
| 3781 // Prevent process from exiting upon "read error" without consuming all CPU | |
| 3782 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
| 3783 | |
| 3784 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 3785 } | |
| 3786 | |
| 3787 int os::stat(const char *path, struct stat *sbuf) { | |
| 3788 char pathbuf[MAX_PATH]; | |
| 3789 if (strlen(path) > MAX_PATH - 1) { | |
| 3790 errno = ENAMETOOLONG; | |
| 3791 return -1; | |
| 3792 } | |
| 3793 os::native_path(strcpy(pathbuf, path)); | |
| 3794 return ::stat(pathbuf, sbuf); | |
| 3795 } | |
| 3796 | |
| 3797 bool os::check_heap(bool force) { | |
| 3798 return true; | |
| 3799 } | |
| 3800 | |
| 3801 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
| 3802 return ::vsnprintf(buf, count, format, args); | |
| 3803 } | |
| 3804 | |
| 3805 // Is a (classpath) directory empty? | |
| 3806 bool os::dir_is_empty(const char* path) { | |
| 3807 DIR *dir = NULL; | |
| 3808 struct dirent *ptr; | |
| 3809 | |
| 3810 dir = opendir(path); | |
| 3811 if (dir == NULL) return true; | |
| 3812 | |
| 3813 /* Scan the directory */ | |
| 3814 bool result = true; | |
| 3815 char buf[sizeof(struct dirent) + MAX_PATH]; | |
| 3816 while (result && (ptr = ::readdir(dir)) != NULL) { | |
| 3817 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
| 3818 result = false; | |
| 3819 } | |
| 3820 } | |
| 3821 closedir(dir); | |
| 3822 return result; | |
| 3823 } | |
| 3824 | |
| 3825 // This code originates from JDK's sysOpen and open64_w | |
| 3826 // from src/solaris/hpi/src/system_md.c | |
| 3827 | |
| 3828 #ifndef O_DELETE | |
| 3829 #define O_DELETE 0x10000 | |
| 3830 #endif | |
| 3831 | |
| 3832 // Open a file. Unlink the file immediately after open returns | |
| 3833 // if the specified oflag has the O_DELETE flag set. | |
| 3834 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
| 3835 | |
| 3836 int os::open(const char *path, int oflag, int mode) { | |
| 3837 | |
| 3838 if (strlen(path) > MAX_PATH - 1) { | |
| 3839 errno = ENAMETOOLONG; | |
| 3840 return -1; | |
| 3841 } | |
| 3842 int fd; | |
| 3843 int o_delete = (oflag & O_DELETE); | |
| 3844 oflag = oflag & ~O_DELETE; | |
| 3845 | |
| 3846 fd = ::open(path, oflag, mode); | |
| 3847 if (fd == -1) return -1; | |
| 3848 | |
| 3849 //If the open succeeded, the file might still be a directory | |
| 3850 { | |
| 3851 struct stat buf; | |
| 3852 int ret = ::fstat(fd, &buf); | |
| 3853 int st_mode = buf.st_mode; | |
| 3854 | |
| 3855 if (ret != -1) { | |
| 3856 if ((st_mode & S_IFMT) == S_IFDIR) { | |
| 3857 errno = EISDIR; | |
| 3858 ::close(fd); | |
| 3859 return -1; | |
| 3860 } | |
| 3861 } else { | |
| 3862 ::close(fd); | |
| 3863 return -1; | |
| 3864 } | |
| 3865 } | |
| 3866 | |
| 3867 /* | |
| 3868 * All file descriptors that are opened in the JVM and not | |
| 3869 * specifically destined for a subprocess should have the | |
| 3870 * close-on-exec flag set. If we don't set it, then careless 3rd | |
| 3871 * party native code might fork and exec without closing all | |
| 3872 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
| 3873 * UNIXProcess.c), and this in turn might: | |
| 3874 * | |
| 3875 * - cause end-of-file to fail to be detected on some file | |
| 3876 * descriptors, resulting in mysterious hangs, or | |
| 3877 * | |
| 3878 * - might cause an fopen in the subprocess to fail on a system | |
| 3879 * suffering from bug 1085341. | |
| 3880 * | |
| 3881 * (Yes, the default setting of the close-on-exec flag is a Unix | |
| 3882 * design flaw) | |
| 3883 * | |
| 3884 * See: | |
| 3885 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
| 3886 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
| 3887 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
| 3888 */ | |
| 3889 #ifdef FD_CLOEXEC | |
| 3890 { | |
| 3891 int flags = ::fcntl(fd, F_GETFD); | |
| 3892 if (flags != -1) | |
| 3893 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
| 3894 } | |
| 3895 #endif | |
| 3896 | |
| 3897 if (o_delete != 0) { | |
| 3898 ::unlink(path); | |
| 3899 } | |
| 3900 return fd; | |
| 3901 } | |
| 3902 | |
| 3903 | |
| 3904 // create binary file, rewriting existing file if required | |
| 3905 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 3906 int oflags = O_WRONLY | O_CREAT; | |
| 3907 if (!rewrite_existing) { | |
| 3908 oflags |= O_EXCL; | |
| 3909 } | |
| 3910 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
| 3911 } | |
| 3912 | |
| 3913 // return current position of file pointer | |
| 3914 jlong os::current_file_offset(int fd) { | |
| 3915 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
| 3916 } | |
| 3917 | |
| 3918 // move file pointer to the specified offset | |
| 3919 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 3920 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
| 3921 } | |
| 3922 | |
| 3923 // This code originates from JDK's sysAvailable | |
| 3924 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
| 3925 | |
| 3926 int os::available(int fd, jlong *bytes) { | |
| 3927 jlong cur, end; | |
| 3928 int mode; | |
| 3929 struct stat buf; | |
| 3930 | |
| 3931 if (::fstat(fd, &buf) >= 0) { | |
| 3932 mode = buf.st_mode; | |
| 3933 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
| 3934 /* | |
| 3935 * XXX: is the following call interruptible? If so, this might | |
| 3936 * need to go through the INTERRUPT_IO() wrapper as for other | |
| 3937 * blocking, interruptible calls in this file. | |
| 3938 */ | |
| 3939 int n; | |
| 3940 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
| 3941 *bytes = n; | |
| 3942 return 1; | |
| 3943 } | |
| 3944 } | |
| 3945 } | |
| 3946 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
| 3947 return 0; | |
| 3948 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
| 3949 return 0; | |
| 3950 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
| 3951 return 0; | |
| 3952 } | |
| 3953 *bytes = end - cur; | |
| 3954 return 1; | |
| 3955 } | |
| 3956 | |
| 3957 int os::socket_available(int fd, jint *pbytes) { | |
| 3958 if (fd < 0) | |
| 3959 return OS_OK; | |
| 3960 | |
| 3961 int ret; | |
| 3962 | |
| 3963 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
| 3964 | |
| 3965 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
| 3966 // is expected to return 0 on failure and 1 on success to the jdk. | |
| 3967 | |
| 3968 return (ret == OS_ERR) ? 0 : 1; | |
| 3969 } | |
| 3970 | |
| 3971 // Map a block of memory. | |
| 6197 | 3972 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 3973 char *addr, size_t bytes, bool read_only, |
| 3974 bool allow_exec) { | |
| 3975 int prot; | |
| 3976 int flags; | |
| 3977 | |
| 3978 if (read_only) { | |
| 3979 prot = PROT_READ; | |
| 3980 flags = MAP_SHARED; | |
| 3981 } else { | |
| 3982 prot = PROT_READ | PROT_WRITE; | |
| 3983 flags = MAP_PRIVATE; | |
| 3984 } | |
| 3985 | |
| 3986 if (allow_exec) { | |
| 3987 prot |= PROT_EXEC; | |
| 3988 } | |
| 3989 | |
| 3990 if (addr != NULL) { | |
| 3991 flags |= MAP_FIXED; | |
| 3992 } | |
| 3993 | |
| 3994 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
| 3995 fd, file_offset); | |
| 3996 if (mapped_address == MAP_FAILED) { | |
| 3997 return NULL; | |
| 3998 } | |
| 3999 return mapped_address; | |
| 4000 } | |
| 4001 | |
| 4002 | |
| 4003 // Remap a block of memory. | |
| 6197 | 4004 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 4005 char *addr, size_t bytes, bool read_only, |
| 4006 bool allow_exec) { | |
| 4007 // same as map_memory() on this OS | |
| 4008 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 4009 allow_exec); | |
| 4010 } | |
| 4011 | |
| 4012 | |
| 4013 // Unmap a block of memory. | |
| 6197 | 4014 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| 3960 | 4015 return munmap(addr, bytes) == 0; |
| 4016 } | |
| 4017 | |
| 4018 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 4019 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 4020 // of a thread. | |
| 4021 // | |
| 4022 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 4023 // the fast estimate available on the platform. | |
| 4024 | |
| 4025 jlong os::current_thread_cpu_time() { | |
| 4026 #ifdef __APPLE__ | |
| 4027 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
|
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|
4028 #else |
|
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diff
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|
4029 Unimplemented(); |
|
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morris
parents:
8067
diff
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|
4030 return 0; |
| 3960 | 4031 #endif |
| 4032 } | |
| 4033 | |
| 4034 jlong os::thread_cpu_time(Thread* thread) { | |
|
8689
bf06968a8a00
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parents:
8067
diff
changeset
|
4035 #ifdef __APPLE__ |
|
bf06968a8a00
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morris
parents:
8067
diff
changeset
|
4036 return os::thread_cpu_time(thread, true /* user + sys */); |
|
bf06968a8a00
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8067
diff
changeset
|
4037 #else |
|
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4038 Unimplemented(); |
|
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4039 return 0; |
|
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|
4040 #endif |
| 3960 | 4041 } |
| 4042 | |
| 4043 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 4044 #ifdef __APPLE__ | |
| 4045 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
|
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|
4046 #else |
|
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|
4047 Unimplemented(); |
|
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4048 return 0; |
| 3960 | 4049 #endif |
| 4050 } | |
| 4051 | |
| 4052 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 4053 #ifdef __APPLE__ | |
| 4054 struct thread_basic_info tinfo; | |
| 4055 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
| 4056 kern_return_t kr; | |
|
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4057 thread_t mach_thread; |
|
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4058 |
|
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|
4059 mach_thread = thread->osthread()->thread_id(); |
| 3960 | 4060 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
| 4061 if (kr != KERN_SUCCESS) | |
| 4062 return -1; | |
| 4063 | |
| 4064 if (user_sys_cpu_time) { | |
| 4065 jlong nanos; | |
| 4066 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
| 4067 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
| 4068 return nanos; | |
| 4069 } else { | |
| 4070 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
| 4071 } | |
|
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4072 #else |
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4073 Unimplemented(); |
|
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|
4074 return 0; |
| 3960 | 4075 #endif |
| 4076 } | |
| 4077 | |
| 4078 | |
| 4079 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 4080 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 4081 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 4082 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 4083 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 4084 } | |
| 4085 | |
| 4086 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 4087 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 4088 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 4089 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 4090 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 4091 } | |
| 4092 | |
| 4093 bool os::is_thread_cpu_time_supported() { | |
| 4094 #ifdef __APPLE__ | |
| 4095 return true; | |
| 6918 | 4096 #else |
| 3960 | 4097 return false; |
| 4098 #endif | |
| 4099 } | |
| 4100 | |
| 4101 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 4102 // Bsd doesn't yet have a (official) notion of processor sets, | |
| 4103 // so just return the system wide load average. | |
| 4104 int os::loadavg(double loadavg[], int nelem) { | |
| 4105 return ::getloadavg(loadavg, nelem); | |
| 4106 } | |
| 4107 | |
| 4108 void os::pause() { | |
| 4109 char filename[MAX_PATH]; | |
| 4110 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 4111 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 4112 } else { | |
| 4113 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 4114 } | |
| 4115 | |
| 4116 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 4117 if (fd != -1) { | |
| 4118 struct stat buf; | |
| 4119 ::close(fd); | |
| 4120 while (::stat(filename, &buf) == 0) { | |
| 4121 (void)::poll(NULL, 0, 100); | |
| 4122 } | |
| 4123 } else { | |
| 4124 jio_fprintf(stderr, | |
| 4125 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 4126 } | |
| 4127 } | |
| 4128 | |
| 4129 | |
| 4130 // Refer to the comments in os_solaris.cpp park-unpark. | |
| 4131 // | |
| 4132 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
| 4133 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
| 4134 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
| 4135 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
| 4136 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
| 4137 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
| 4138 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
| 4139 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
| 4140 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
| 4141 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
| 4142 // of libpthread avoids the problem, but isn't practical. | |
| 4143 // | |
| 4144 // Possible remedies: | |
| 4145 // | |
| 4146 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
| 4147 // This is palliative and probabilistic, however. If the thread is preempted | |
| 4148 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
| 4149 // than the minimum period may have passed, and the abstime may be stale (in the | |
| 4150 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
| 4151 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
| 4152 // | |
| 4153 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
| 4154 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
| 4155 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
| 4156 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
| 4157 // thread. | |
| 4158 // | |
| 4159 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
| 4160 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
| 4161 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
| 4162 // This also works well. In fact it avoids kernel-level scalability impediments | |
| 4163 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
| 4164 // timers in a graceful fashion. | |
| 4165 // | |
| 4166 // 4. When the abstime value is in the past it appears that control returns | |
| 4167 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
| 4168 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
| 4169 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
| 4170 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
| 4171 // It may be possible to avoid reinitialization by checking the return | |
| 4172 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
| 4173 // condvar we must establish the invariant that cond_signal() is only called | |
| 4174 // within critical sections protected by the adjunct mutex. This prevents | |
| 4175 // cond_signal() from "seeing" a condvar that's in the midst of being | |
| 4176 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
| 4177 // desirable signal-after-unlock optimization that avoids futile context switching. | |
| 4178 // | |
| 4179 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
| 4180 // structure when a condvar is used or initialized. cond_destroy() would | |
| 4181 // release the helper structure. Our reinitialize-after-timedwait fix | |
| 4182 // put excessive stress on malloc/free and locks protecting the c-heap. | |
| 4183 // | |
| 4184 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
| 4185 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
| 4186 // and only enabling the work-around for vulnerable environments. | |
| 4187 | |
| 4188 // utility to compute the abstime argument to timedwait: | |
| 4189 // millis is the relative timeout time | |
| 4190 // abstime will be the absolute timeout time | |
| 4191 // TODO: replace compute_abstime() with unpackTime() | |
| 4192 | |
| 4193 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
| 4194 if (millis < 0) millis = 0; | |
| 4195 struct timeval now; | |
| 4196 int status = gettimeofday(&now, NULL); | |
| 4197 assert(status == 0, "gettimeofday"); | |
| 4198 jlong seconds = millis / 1000; | |
| 4199 millis %= 1000; | |
| 4200 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
| 4201 seconds = 50000000; | |
| 4202 } | |
| 4203 abstime->tv_sec = now.tv_sec + seconds; | |
| 4204 long usec = now.tv_usec + millis * 1000; | |
| 4205 if (usec >= 1000000) { | |
| 4206 abstime->tv_sec += 1; | |
| 4207 usec -= 1000000; | |
| 4208 } | |
| 4209 abstime->tv_nsec = usec * 1000; | |
| 4210 return abstime; | |
| 4211 } | |
| 4212 | |
| 4213 | |
| 4214 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
| 4215 // Conceptually TryPark() should be equivalent to park(0). | |
| 4216 | |
| 4217 int os::PlatformEvent::TryPark() { | |
| 4218 for (;;) { | |
| 4219 const int v = _Event ; | |
| 4220 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 4221 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
| 4222 } | |
| 4223 } | |
| 4224 | |
| 4225 void os::PlatformEvent::park() { // AKA "down()" | |
| 4226 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 4227 // may call park(). | |
| 4228 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
| 4229 int v ; | |
| 4230 for (;;) { | |
| 4231 v = _Event ; | |
| 4232 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4233 } | |
| 4234 guarantee (v >= 0, "invariant") ; | |
| 4235 if (v == 0) { | |
| 4236 // Do this the hard way by blocking ... | |
| 4237 int status = pthread_mutex_lock(_mutex); | |
| 4238 assert_status(status == 0, status, "mutex_lock"); | |
| 4239 guarantee (_nParked == 0, "invariant") ; | |
| 4240 ++ _nParked ; | |
| 4241 while (_Event < 0) { | |
| 4242 status = pthread_cond_wait(_cond, _mutex); | |
| 4243 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
| 4244 // Treat this the same as if the wait was interrupted | |
| 4245 if (status == ETIMEDOUT) { status = EINTR; } | |
| 4246 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
| 4247 } | |
| 4248 -- _nParked ; | |
| 4249 | |
| 4250 _Event = 0 ; | |
| 4251 status = pthread_mutex_unlock(_mutex); | |
| 4252 assert_status(status == 0, status, "mutex_unlock"); | |
|
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4253 // Paranoia to ensure our locked and lock-free paths interact |
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4254 // correctly with each other. |
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4255 OrderAccess::fence(); |
| 3960 | 4256 } |
| 4257 guarantee (_Event >= 0, "invariant") ; | |
| 4258 } | |
| 4259 | |
| 4260 int os::PlatformEvent::park(jlong millis) { | |
| 4261 guarantee (_nParked == 0, "invariant") ; | |
| 4262 | |
| 4263 int v ; | |
| 4264 for (;;) { | |
| 4265 v = _Event ; | |
| 4266 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4267 } | |
| 4268 guarantee (v >= 0, "invariant") ; | |
| 4269 if (v != 0) return OS_OK ; | |
| 4270 | |
| 4271 // We do this the hard way, by blocking the thread. | |
| 4272 // Consider enforcing a minimum timeout value. | |
| 4273 struct timespec abst; | |
| 4274 compute_abstime(&abst, millis); | |
| 4275 | |
| 4276 int ret = OS_TIMEOUT; | |
| 4277 int status = pthread_mutex_lock(_mutex); | |
| 4278 assert_status(status == 0, status, "mutex_lock"); | |
| 4279 guarantee (_nParked == 0, "invariant") ; | |
| 4280 ++_nParked ; | |
| 4281 | |
| 4282 // Object.wait(timo) will return because of | |
| 4283 // (a) notification | |
| 4284 // (b) timeout | |
| 4285 // (c) thread.interrupt | |
| 4286 // | |
| 4287 // Thread.interrupt and object.notify{All} both call Event::set. | |
| 4288 // That is, we treat thread.interrupt as a special case of notification. | |
| 4289 // The underlying Solaris implementation, cond_timedwait, admits | |
| 4290 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
| 4291 // JVM from making those visible to Java code. As such, we must | |
| 4292 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
| 4293 // | |
| 4294 // TODO: properly differentiate simultaneous notify+interrupt. | |
| 4295 // In that case, we should propagate the notify to another waiter. | |
| 4296 | |
| 4297 while (_Event < 0) { | |
| 4298 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
| 4299 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4300 pthread_cond_destroy (_cond); | |
| 4301 pthread_cond_init (_cond, NULL) ; | |
| 4302 } | |
| 4303 assert_status(status == 0 || status == EINTR || | |
| 4304 status == ETIMEDOUT, | |
| 4305 status, "cond_timedwait"); | |
| 4306 if (!FilterSpuriousWakeups) break ; // previous semantics | |
| 4307 if (status == ETIMEDOUT) break ; | |
| 4308 // We consume and ignore EINTR and spurious wakeups. | |
| 4309 } | |
| 4310 --_nParked ; | |
| 4311 if (_Event >= 0) { | |
| 4312 ret = OS_OK; | |
| 4313 } | |
| 4314 _Event = 0 ; | |
| 4315 status = pthread_mutex_unlock(_mutex); | |
| 4316 assert_status(status == 0, status, "mutex_unlock"); | |
| 4317 assert (_nParked == 0, "invariant") ; | |
|
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4318 // Paranoia to ensure our locked and lock-free paths interact |
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4319 // correctly with each other. |
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4320 OrderAccess::fence(); |
| 3960 | 4321 return ret; |
| 4322 } | |
| 4323 | |
| 4324 void os::PlatformEvent::unpark() { | |
|
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4325 // Transitions for _Event: |
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4326 // 0 :=> 1 |
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4327 // 1 :=> 1 |
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4328 // -1 :=> either 0 or 1; must signal target thread |
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4329 // That is, we can safely transition _Event from -1 to either |
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4330 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4331 // unpark() calls. |
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4332 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4333 // |
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4334 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4335 // that it will take two back-to-back park() calls for the owning |
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4336 // thread to block. This has the benefit of forcing a spurious return |
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4337 // from the first park() call after an unpark() call which will help |
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4338 // shake out uses of park() and unpark() without condition variables. |
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4339 |
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4340 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4341 |
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4342 // Wait for the thread associated with the event to vacate |
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4343 int status = pthread_mutex_lock(_mutex); |
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4344 assert_status(status == 0, status, "mutex_lock"); |
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4345 int AnyWaiters = _nParked; |
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4346 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4347 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4348 AnyWaiters = 0; |
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4349 pthread_cond_signal(_cond); |
| 3960 | 4350 } |
|
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4351 status = pthread_mutex_unlock(_mutex); |
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4352 assert_status(status == 0, status, "mutex_unlock"); |
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4353 if (AnyWaiters != 0) { |
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|
4354 status = pthread_cond_signal(_cond); |
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|
4355 assert_status(status == 0, status, "cond_signal"); |
| 3960 | 4356 } |
| 4357 | |
| 4358 // Note that we signal() _after dropping the lock for "immortal" Events. | |
| 4359 // This is safe and avoids a common class of futile wakeups. In rare | |
| 4360 // circumstances this can cause a thread to return prematurely from | |
| 4361 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
| 4362 // simply re-test the condition and re-park itself. | |
| 4363 } | |
| 4364 | |
| 4365 | |
| 4366 // JSR166 | |
| 4367 // ------------------------------------------------------- | |
| 4368 | |
| 4369 /* | |
| 4370 * The solaris and bsd implementations of park/unpark are fairly | |
| 4371 * conservative for now, but can be improved. They currently use a | |
| 4372 * mutex/condvar pair, plus a a count. | |
| 4373 * Park decrements count if > 0, else does a condvar wait. Unpark | |
| 4374 * sets count to 1 and signals condvar. Only one thread ever waits | |
| 4375 * on the condvar. Contention seen when trying to park implies that someone | |
| 4376 * is unparking you, so don't wait. And spurious returns are fine, so there | |
| 4377 * is no need to track notifications. | |
| 4378 */ | |
| 4379 | |
| 4380 #define MAX_SECS 100000000 | |
| 4381 /* | |
| 4382 * This code is common to bsd and solaris and will be moved to a | |
| 4383 * common place in dolphin. | |
| 4384 * | |
| 4385 * The passed in time value is either a relative time in nanoseconds | |
| 4386 * or an absolute time in milliseconds. Either way it has to be unpacked | |
| 4387 * into suitable seconds and nanoseconds components and stored in the | |
| 4388 * given timespec structure. | |
| 4389 * Given time is a 64-bit value and the time_t used in the timespec is only | |
| 4390 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
| 4391 * overflow if times way in the future are given. Further on Solaris versions | |
| 4392 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
| 4393 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
| 4394 * As it will be 28 years before "now + 100000000" will overflow we can | |
| 4395 * ignore overflow and just impose a hard-limit on seconds using the value | |
| 4396 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
| 4397 * years from "now". | |
| 4398 */ | |
| 4399 | |
| 4400 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
| 4401 assert (time > 0, "convertTime"); | |
| 4402 | |
| 4403 struct timeval now; | |
| 4404 int status = gettimeofday(&now, NULL); | |
| 4405 assert(status == 0, "gettimeofday"); | |
| 4406 | |
| 4407 time_t max_secs = now.tv_sec + MAX_SECS; | |
| 4408 | |
| 4409 if (isAbsolute) { | |
| 4410 jlong secs = time / 1000; | |
| 4411 if (secs > max_secs) { | |
| 4412 absTime->tv_sec = max_secs; | |
| 4413 } | |
| 4414 else { | |
| 4415 absTime->tv_sec = secs; | |
| 4416 } | |
| 4417 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
| 4418 } | |
| 4419 else { | |
| 4420 jlong secs = time / NANOSECS_PER_SEC; | |
| 4421 if (secs >= MAX_SECS) { | |
| 4422 absTime->tv_sec = max_secs; | |
| 4423 absTime->tv_nsec = 0; | |
| 4424 } | |
| 4425 else { | |
| 4426 absTime->tv_sec = now.tv_sec + secs; | |
| 4427 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
| 4428 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
| 4429 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
| 4430 ++absTime->tv_sec; // note: this must be <= max_secs | |
| 4431 } | |
| 4432 } | |
| 4433 } | |
| 4434 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
| 4435 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
| 4436 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
| 4437 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
| 4438 } | |
| 4439 | |
| 4440 void Parker::park(bool isAbsolute, jlong time) { | |
|
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4441 // Ideally we'd do something useful while spinning, such |
|
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4442 // as calling unpackTime(). |
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4443 |
| 3960 | 4444 // Optional fast-path check: |
| 4445 // Return immediately if a permit is available. | |
|
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4446 // We depend on Atomic::xchg() having full barrier semantics |
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4447 // since we are doing a lock-free update to _counter. |
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|
4448 if (Atomic::xchg(0, &_counter) > 0) return; |
| 3960 | 4449 |
| 4450 Thread* thread = Thread::current(); | |
| 4451 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 4452 JavaThread *jt = (JavaThread *)thread; | |
| 4453 | |
| 4454 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
| 4455 // Check interrupt before trying to wait | |
| 4456 if (Thread::is_interrupted(thread, false)) { | |
| 4457 return; | |
| 4458 } | |
| 4459 | |
| 4460 // Next, demultiplex/decode time arguments | |
| 4461 struct timespec absTime; | |
| 4462 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
| 4463 return; | |
| 4464 } | |
| 4465 if (time > 0) { | |
| 4466 unpackTime(&absTime, isAbsolute, time); | |
| 4467 } | |
| 4468 | |
| 4469 | |
| 4470 // Enter safepoint region | |
| 4471 // Beware of deadlocks such as 6317397. | |
| 4472 // The per-thread Parker:: mutex is a classic leaf-lock. | |
| 4473 // In particular a thread must never block on the Threads_lock while | |
| 4474 // holding the Parker:: mutex. If safepoints are pending both the | |
| 4475 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
| 4476 ThreadBlockInVM tbivm(jt); | |
| 4477 | |
| 4478 // Don't wait if cannot get lock since interference arises from | |
| 4479 // unblocking. Also. check interrupt before trying wait | |
| 4480 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
| 4481 return; | |
| 4482 } | |
| 4483 | |
| 4484 int status ; | |
| 4485 if (_counter > 0) { // no wait needed | |
| 4486 _counter = 0; | |
| 4487 status = pthread_mutex_unlock(_mutex); | |
| 4488 assert (status == 0, "invariant") ; | |
|
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4489 // Paranoia to ensure our locked and lock-free paths interact |
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|
4490 // correctly with each other and Java-level accesses. |
| 3960 | 4491 OrderAccess::fence(); |
| 4492 return; | |
| 4493 } | |
| 4494 | |
| 4495 #ifdef ASSERT | |
| 4496 // Don't catch signals while blocked; let the running threads have the signals. | |
| 4497 // (This allows a debugger to break into the running thread.) | |
| 4498 sigset_t oldsigs; | |
| 4499 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
| 4500 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
| 4501 #endif | |
| 4502 | |
| 4503 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 4504 jt->set_suspend_equivalent(); | |
| 4505 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 4506 | |
| 4507 if (time == 0) { | |
| 4508 status = pthread_cond_wait (_cond, _mutex) ; | |
| 4509 } else { | |
| 4510 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
| 4511 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4512 pthread_cond_destroy (_cond) ; | |
| 4513 pthread_cond_init (_cond, NULL); | |
| 4514 } | |
| 4515 } | |
| 4516 assert_status(status == 0 || status == EINTR || | |
| 4517 status == ETIMEDOUT, | |
| 4518 status, "cond_timedwait"); | |
| 4519 | |
| 4520 #ifdef ASSERT | |
| 4521 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
| 4522 #endif | |
| 4523 | |
| 4524 _counter = 0 ; | |
| 4525 status = pthread_mutex_unlock(_mutex) ; | |
| 4526 assert_status(status == 0, status, "invariant") ; | |
|
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4527 // Paranoia to ensure our locked and lock-free paths interact |
|
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|
4528 // correctly with each other and Java-level accesses. |
|
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|
4529 OrderAccess::fence(); |
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|
4530 |
| 3960 | 4531 // If externally suspended while waiting, re-suspend |
| 4532 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 4533 jt->java_suspend_self(); | |
| 4534 } | |
| 4535 } | |
| 4536 | |
| 4537 void Parker::unpark() { | |
| 4538 int s, status ; | |
| 4539 status = pthread_mutex_lock(_mutex); | |
| 4540 assert (status == 0, "invariant") ; | |
| 4541 s = _counter; | |
| 4542 _counter = 1; | |
| 4543 if (s < 1) { | |
| 4544 if (WorkAroundNPTLTimedWaitHang) { | |
| 4545 status = pthread_cond_signal (_cond) ; | |
| 4546 assert (status == 0, "invariant") ; | |
| 4547 status = pthread_mutex_unlock(_mutex); | |
| 4548 assert (status == 0, "invariant") ; | |
| 4549 } else { | |
| 4550 status = pthread_mutex_unlock(_mutex); | |
| 4551 assert (status == 0, "invariant") ; | |
| 4552 status = pthread_cond_signal (_cond) ; | |
| 4553 assert (status == 0, "invariant") ; | |
| 4554 } | |
| 4555 } else { | |
| 4556 pthread_mutex_unlock(_mutex); | |
| 4557 assert (status == 0, "invariant") ; | |
| 4558 } | |
| 4559 } | |
| 4560 | |
| 4561 | |
| 4562 /* Darwin has no "environ" in a dynamic library. */ | |
| 4563 #ifdef __APPLE__ | |
| 4564 #include <crt_externs.h> | |
| 4565 #define environ (*_NSGetEnviron()) | |
| 4566 #else | |
| 4567 extern char** environ; | |
| 4568 #endif | |
| 4569 | |
| 4570 // Run the specified command in a separate process. Return its exit value, | |
| 4571 // or -1 on failure (e.g. can't fork a new process). | |
| 4572 // Unlike system(), this function can be called from signal handler. It | |
| 4573 // doesn't block SIGINT et al. | |
| 4574 int os::fork_and_exec(char* cmd) { | |
| 4575 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
| 4576 | |
| 4577 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
| 4578 // pthread_atfork handlers and reset pthread library. All we need is a | |
| 4579 // separate process to execve. Make a direct syscall to fork process. | |
| 4580 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
| 4581 // the best... | |
| 4582 pid_t pid = fork(); | |
| 4583 | |
| 4584 if (pid < 0) { | |
| 4585 // fork failed | |
| 4586 return -1; | |
| 4587 | |
| 4588 } else if (pid == 0) { | |
| 4589 // child process | |
| 4590 | |
| 4591 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
| 4592 // first to kill every thread on the thread list. Because this list is | |
| 4593 // not reset by fork() (see notes above), execve() will instead kill | |
| 4594 // every thread in the parent process. We know this is the only thread | |
| 4595 // in the new process, so make a system call directly. | |
| 4596 // IA64 should use normal execve() from glibc to match the glibc fork() | |
| 4597 // above. | |
| 4598 execve("/bin/sh", (char* const*)argv, environ); | |
| 4599 | |
| 4600 // execve failed | |
| 4601 _exit(-1); | |
| 4602 | |
| 4603 } else { | |
| 4604 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
| 4605 // care about the actual exit code, for now. | |
| 4606 | |
| 4607 int status; | |
| 4608 | |
| 4609 // Wait for the child process to exit. This returns immediately if | |
| 4610 // the child has already exited. */ | |
| 4611 while (waitpid(pid, &status, 0) < 0) { | |
| 4612 switch (errno) { | |
| 4613 case ECHILD: return 0; | |
| 4614 case EINTR: break; | |
| 4615 default: return -1; | |
| 4616 } | |
| 4617 } | |
| 4618 | |
| 4619 if (WIFEXITED(status)) { | |
| 4620 // The child exited normally; get its exit code. | |
| 4621 return WEXITSTATUS(status); | |
| 4622 } else if (WIFSIGNALED(status)) { | |
| 4623 // The child exited because of a signal | |
| 4624 // The best value to return is 0x80 + signal number, | |
| 4625 // because that is what all Unix shells do, and because | |
| 4626 // it allows callers to distinguish between process exit and | |
| 4627 // process death by signal. | |
| 4628 return 0x80 + WTERMSIG(status); | |
| 4629 } else { | |
| 4630 // Unknown exit code; pass it through | |
| 4631 return status; | |
| 4632 } | |
| 4633 } | |
| 4634 } | |
| 4635 | |
| 4636 // is_headless_jre() | |
| 4637 // | |
|
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|
4638 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
| 3960 | 4639 // in order to report if we are running in a headless jre |
| 4640 // | |
|
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|
4641 // Since JDK8 xawt/libmawt.so was moved into the same directory |
|
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|
4642 // as libawt.so, and renamed libawt_xawt.so |
|
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|
4643 // |
| 3960 | 4644 bool os::is_headless_jre() { |
| 4645 struct stat statbuf; | |
| 4646 char buf[MAXPATHLEN]; | |
| 4647 char libmawtpath[MAXPATHLEN]; | |
| 4006 | 4648 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
| 5921 | 4649 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
| 3960 | 4650 char *p; |
| 4651 | |
| 4652 // Get path to libjvm.so | |
| 4653 os::jvm_path(buf, sizeof(buf)); | |
| 4654 | |
| 4655 // Get rid of libjvm.so | |
| 4656 p = strrchr(buf, '/'); | |
| 4657 if (p == NULL) return false; | |
| 4658 else *p = '\0'; | |
| 4659 | |
| 4660 // Get rid of client or server | |
| 4661 p = strrchr(buf, '/'); | |
| 4662 if (p == NULL) return false; | |
| 4663 else *p = '\0'; | |
| 4664 | |
| 4665 // check xawt/libmawt.so | |
| 4666 strcpy(libmawtpath, buf); | |
| 4667 strcat(libmawtpath, xawtstr); | |
| 4668 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
| 4669 | |
|
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|
4670 // check libawt_xawt.so |
| 3960 | 4671 strcpy(libmawtpath, buf); |
|
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|
4672 strcat(libmawtpath, new_xawtstr); |
| 3960 | 4673 if (::stat(libmawtpath, &statbuf) == 0) return false; |
| 4674 | |
| 4675 return true; | |
| 4676 } | |
|
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|
4677 |
|
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|
4678 // Get the default path to the core file |
|
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|
4679 // Returns the length of the string |
|
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|
4680 int os::get_core_path(char* buffer, size_t bufferSize) { |
|
65906dc96aa1
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6197
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|
4681 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
|
65906dc96aa1
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6197
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|
4682 |
|
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|
4683 // Truncate if theoretical string was longer than bufferSize |
|
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|
4684 n = MIN2(n, (int)bufferSize); |
|
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|
4685 |
|
65906dc96aa1
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|
4686 return n; |
|
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|
4687 } |
| 10405 | 4688 |