Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 12355:cefad50507d8
Merge with hs25-b53
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Fri, 11 Oct 2013 10:38:03 +0200 |
| parents | 6b0fd0964b87 40136aa2cdb1 |
| children | 096c224171c4 |
| 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__ |
| 12095 | 645 static uint64_t locate_unique_thread_id(mach_port_t mach_thread_port) { |
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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 |
| 12095 | 650 thread_info(mach_thread_port, THREAD_IDENTIFIER_INFO, |
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651 (thread_info_t) &m_ident_info, &count); |
| 12095 | 652 |
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653 return m_ident_info.thread_id; |
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654 } |
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655 #endif |
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656 |
| 3960 | 657 // Thread start routine for all newly created threads |
| 658 static void *java_start(Thread *thread) { | |
| 659 // Try to randomize the cache line index of hot stack frames. | |
| 660 // This helps when threads of the same stack traces evict each other's | |
| 661 // cache lines. The threads can be either from the same JVM instance, or | |
| 662 // from different JVM instances. The benefit is especially true for | |
| 663 // processors with hyperthreading technology. | |
| 664 static int counter = 0; | |
| 665 int pid = os::current_process_id(); | |
| 666 alloca(((pid ^ counter++) & 7) * 128); | |
| 667 | |
| 668 ThreadLocalStorage::set_thread(thread); | |
| 669 | |
| 670 OSThread* osthread = thread->osthread(); | |
| 671 Monitor* sync = osthread->startThread_lock(); | |
| 672 | |
| 673 // non floating stack BsdThreads needs extra check, see above | |
| 674 if (!_thread_safety_check(thread)) { | |
| 675 // notify parent thread | |
| 676 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 677 osthread->set_state(ZOMBIE); | |
| 678 sync->notify_all(); | |
| 679 return NULL; | |
| 680 } | |
| 681 | |
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682 #ifdef __APPLE__ |
| 12095 | 683 // thread_id is mach thread on macos, which pthreads graciously caches and provides for us |
| 684 mach_port_t thread_id = ::pthread_mach_thread_np(::pthread_self()); | |
| 685 guarantee(thread_id != 0, "thread id missing from pthreads"); | |
| 686 osthread->set_thread_id(thread_id); | |
| 687 | |
| 688 uint64_t unique_thread_id = locate_unique_thread_id(thread_id); | |
| 689 guarantee(unique_thread_id != 0, "unique thread id was not found"); | |
| 690 osthread->set_unique_thread_id(unique_thread_id); | |
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691 #else |
| 3960 | 692 // thread_id is pthread_id on BSD |
| 693 osthread->set_thread_id(::pthread_self()); | |
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694 #endif |
| 3960 | 695 // initialize signal mask for this thread |
| 696 os::Bsd::hotspot_sigmask(thread); | |
| 697 | |
| 698 // initialize floating point control register | |
| 699 os::Bsd::init_thread_fpu_state(); | |
| 700 | |
| 4006 | 701 #ifdef __APPLE__ |
| 702 // register thread with objc gc | |
| 703 if (objc_registerThreadWithCollectorFunction != NULL) { | |
| 704 objc_registerThreadWithCollectorFunction(); | |
| 705 } | |
| 706 #endif | |
| 707 | |
| 3960 | 708 // handshaking with parent thread |
| 709 { | |
| 710 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 711 | |
| 712 // notify parent thread | |
| 713 osthread->set_state(INITIALIZED); | |
| 714 sync->notify_all(); | |
| 715 | |
| 716 // wait until os::start_thread() | |
| 717 while (osthread->get_state() == INITIALIZED) { | |
| 718 sync->wait(Mutex::_no_safepoint_check_flag); | |
| 719 } | |
| 720 } | |
| 721 | |
| 722 // call one more level start routine | |
| 723 thread->run(); | |
| 724 | |
| 725 return 0; | |
| 726 } | |
| 727 | |
| 728 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 729 assert(thread->osthread() == NULL, "caller responsible"); | |
| 730 | |
| 731 // Allocate the OSThread object | |
| 732 OSThread* osthread = new OSThread(NULL, NULL); | |
| 733 if (osthread == NULL) { | |
| 734 return false; | |
| 735 } | |
| 736 | |
| 737 // set the correct thread state | |
| 738 osthread->set_thread_type(thr_type); | |
| 739 | |
| 740 // Initial state is ALLOCATED but not INITIALIZED | |
| 741 osthread->set_state(ALLOCATED); | |
| 742 | |
| 743 thread->set_osthread(osthread); | |
| 744 | |
| 745 // init thread attributes | |
| 746 pthread_attr_t attr; | |
| 747 pthread_attr_init(&attr); | |
| 748 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
| 749 | |
| 750 // stack size | |
| 751 if (os::Bsd::supports_variable_stack_size()) { | |
| 752 // calculate stack size if it's not specified by caller | |
| 753 if (stack_size == 0) { | |
| 754 stack_size = os::Bsd::default_stack_size(thr_type); | |
| 755 | |
| 756 switch (thr_type) { | |
| 757 case os::java_thread: | |
| 758 // Java threads use ThreadStackSize which default value can be | |
| 759 // changed with the flag -Xss | |
| 760 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
| 761 stack_size = JavaThread::stack_size_at_create(); | |
| 762 break; | |
| 763 case os::compiler_thread: | |
| 764 if (CompilerThreadStackSize > 0) { | |
| 765 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 766 break; | |
| 767 } // else fall through: | |
| 768 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 769 case os::vm_thread: | |
| 770 case os::pgc_thread: | |
| 771 case os::cgc_thread: | |
| 772 case os::watcher_thread: | |
| 773 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 774 break; | |
| 775 } | |
| 776 } | |
| 777 | |
| 778 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
| 779 pthread_attr_setstacksize(&attr, stack_size); | |
| 780 } else { | |
| 781 // let pthread_create() pick the default value. | |
| 782 } | |
| 783 | |
| 784 ThreadState state; | |
| 785 | |
| 786 { | |
| 787 pthread_t tid; | |
| 788 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
| 789 | |
| 790 pthread_attr_destroy(&attr); | |
| 791 | |
| 792 if (ret != 0) { | |
| 793 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 794 perror("pthread_create()"); | |
| 795 } | |
| 796 // Need to clean up stuff we've allocated so far | |
| 797 thread->set_osthread(NULL); | |
| 798 delete osthread; | |
| 799 return false; | |
| 800 } | |
| 801 | |
| 802 // Store pthread info into the OSThread | |
| 803 osthread->set_pthread_id(tid); | |
| 804 | |
| 805 // Wait until child thread is either initialized or aborted | |
| 806 { | |
| 807 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 808 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 809 while ((state = osthread->get_state()) == ALLOCATED) { | |
| 810 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
| 811 } | |
| 812 } | |
| 813 | |
| 814 } | |
| 815 | |
| 816 // Aborted due to thread limit being reached | |
| 817 if (state == ZOMBIE) { | |
| 818 thread->set_osthread(NULL); | |
| 819 delete osthread; | |
| 820 return false; | |
| 821 } | |
| 822 | |
| 823 // The thread is returned suspended (in state INITIALIZED), | |
| 824 // and is started higher up in the call chain | |
| 825 assert(state == INITIALIZED, "race condition"); | |
| 826 return true; | |
| 827 } | |
| 828 | |
| 829 ///////////////////////////////////////////////////////////////////////////// | |
| 830 // attach existing thread | |
| 831 | |
| 832 // bootstrap the main thread | |
| 833 bool os::create_main_thread(JavaThread* thread) { | |
| 834 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
| 835 return create_attached_thread(thread); | |
| 836 } | |
| 837 | |
| 838 bool os::create_attached_thread(JavaThread* thread) { | |
| 839 #ifdef ASSERT | |
| 840 thread->verify_not_published(); | |
| 841 #endif | |
| 842 | |
| 843 // Allocate the OSThread object | |
| 844 OSThread* osthread = new OSThread(NULL, NULL); | |
| 845 | |
| 846 if (osthread == NULL) { | |
| 847 return false; | |
| 848 } | |
| 849 | |
| 850 // Store pthread info into the OSThread | |
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851 #ifdef __APPLE__ |
| 12095 | 852 // thread_id is mach thread on macos, which pthreads graciously caches and provides for us |
| 853 mach_port_t thread_id = ::pthread_mach_thread_np(::pthread_self()); | |
| 854 guarantee(thread_id != 0, "just checking"); | |
| 855 osthread->set_thread_id(thread_id); | |
| 856 | |
| 857 uint64_t unique_thread_id = locate_unique_thread_id(thread_id); | |
| 858 guarantee(unique_thread_id != 0, "just checking"); | |
| 859 osthread->set_unique_thread_id(unique_thread_id); | |
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860 #else |
| 3960 | 861 osthread->set_thread_id(::pthread_self()); |
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862 #endif |
| 3960 | 863 osthread->set_pthread_id(::pthread_self()); |
| 864 | |
| 865 // initialize floating point control register | |
| 866 os::Bsd::init_thread_fpu_state(); | |
| 867 | |
| 868 // Initial thread state is RUNNABLE | |
| 869 osthread->set_state(RUNNABLE); | |
| 870 | |
| 871 thread->set_osthread(osthread); | |
| 872 | |
| 873 // initialize signal mask for this thread | |
| 874 // and save the caller's signal mask | |
| 875 os::Bsd::hotspot_sigmask(thread); | |
| 876 | |
| 877 return true; | |
| 878 } | |
| 879 | |
| 880 void os::pd_start_thread(Thread* thread) { | |
| 881 OSThread * osthread = thread->osthread(); | |
| 882 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
| 883 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 884 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 885 sync_with_child->notify(); | |
| 886 } | |
| 887 | |
| 888 // Free Bsd resources related to the OSThread | |
| 889 void os::free_thread(OSThread* osthread) { | |
| 890 assert(osthread != NULL, "osthread not set"); | |
| 891 | |
| 892 if (Thread::current()->osthread() == osthread) { | |
| 893 // Restore caller's signal mask | |
| 894 sigset_t sigmask = osthread->caller_sigmask(); | |
| 895 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
| 896 } | |
| 897 | |
| 898 delete osthread; | |
| 899 } | |
| 900 | |
| 901 ////////////////////////////////////////////////////////////////////////////// | |
| 902 // thread local storage | |
| 903 | |
| 904 int os::allocate_thread_local_storage() { | |
| 905 pthread_key_t key; | |
| 906 int rslt = pthread_key_create(&key, NULL); | |
| 907 assert(rslt == 0, "cannot allocate thread local storage"); | |
| 908 return (int)key; | |
| 909 } | |
| 910 | |
| 911 // Note: This is currently not used by VM, as we don't destroy TLS key | |
| 912 // on VM exit. | |
| 913 void os::free_thread_local_storage(int index) { | |
| 914 int rslt = pthread_key_delete((pthread_key_t)index); | |
| 915 assert(rslt == 0, "invalid index"); | |
| 916 } | |
| 917 | |
| 918 void os::thread_local_storage_at_put(int index, void* value) { | |
| 919 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
| 920 assert(rslt == 0, "pthread_setspecific failed"); | |
| 921 } | |
| 922 | |
| 923 extern "C" Thread* get_thread() { | |
| 924 return ThreadLocalStorage::thread(); | |
| 925 } | |
| 926 | |
| 927 | |
| 928 //////////////////////////////////////////////////////////////////////////////// | |
| 929 // time support | |
| 930 | |
| 931 // Time since start-up in seconds to a fine granularity. | |
| 932 // Used by VMSelfDestructTimer and the MemProfiler. | |
| 933 double os::elapsedTime() { | |
| 934 | |
| 935 return (double)(os::elapsed_counter()) * 0.000001; | |
| 936 } | |
| 937 | |
| 938 jlong os::elapsed_counter() { | |
| 939 timeval time; | |
| 940 int status = gettimeofday(&time, NULL); | |
| 941 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
| 942 } | |
| 943 | |
| 944 jlong os::elapsed_frequency() { | |
| 945 return (1000 * 1000); | |
| 946 } | |
| 947 | |
|
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948 bool os::supports_vtime() { return true; } |
| 3960 | 949 bool os::enable_vtime() { return false; } |
| 950 bool os::vtime_enabled() { return false; } | |
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951 |
| 3960 | 952 double os::elapsedVTime() { |
| 953 // better than nothing, but not much | |
| 954 return elapsedTime(); | |
| 955 } | |
| 956 | |
| 957 jlong os::javaTimeMillis() { | |
| 958 timeval time; | |
| 959 int status = gettimeofday(&time, NULL); | |
| 960 assert(status != -1, "bsd error"); | |
| 961 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
| 962 } | |
| 963 | |
| 964 #ifndef CLOCK_MONOTONIC | |
| 965 #define CLOCK_MONOTONIC (1) | |
| 966 #endif | |
| 967 | |
| 968 #ifdef __APPLE__ | |
| 969 void os::Bsd::clock_init() { | |
| 970 // XXXDARWIN: Investigate replacement monotonic clock | |
| 971 } | |
| 6918 | 972 #else |
| 3960 | 973 void os::Bsd::clock_init() { |
| 974 struct timespec res; | |
| 975 struct timespec tp; | |
| 976 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
| 977 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
| 978 // yes, monotonic clock is supported | |
| 979 _clock_gettime = ::clock_gettime; | |
| 980 } | |
| 981 } | |
| 982 #endif | |
| 983 | |
| 984 | |
| 985 jlong os::javaTimeNanos() { | |
| 986 if (Bsd::supports_monotonic_clock()) { | |
| 987 struct timespec tp; | |
| 988 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
| 989 assert(status == 0, "gettime error"); | |
| 990 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
| 991 return result; | |
| 992 } else { | |
| 993 timeval time; | |
| 994 int status = gettimeofday(&time, NULL); | |
| 995 assert(status != -1, "bsd error"); | |
| 996 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
| 997 return 1000 * usecs; | |
| 998 } | |
| 999 } | |
| 1000 | |
| 1001 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 1002 if (Bsd::supports_monotonic_clock()) { | |
| 1003 info_ptr->max_value = ALL_64_BITS; | |
| 1004 | |
| 1005 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
| 1006 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
| 1007 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
| 1008 } else { | |
| 1009 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
| 1010 info_ptr->max_value = ALL_64_BITS; | |
| 1011 | |
| 1012 // gettimeofday is a real time clock so it skips | |
| 1013 info_ptr->may_skip_backward = true; | |
| 1014 info_ptr->may_skip_forward = true; | |
| 1015 } | |
| 1016 | |
| 1017 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 1018 } | |
| 1019 | |
| 1020 // Return the real, user, and system times in seconds from an | |
| 1021 // arbitrary fixed point in the past. | |
| 1022 bool os::getTimesSecs(double* process_real_time, | |
| 1023 double* process_user_time, | |
| 1024 double* process_system_time) { | |
| 1025 struct tms ticks; | |
| 1026 clock_t real_ticks = times(&ticks); | |
| 1027 | |
| 1028 if (real_ticks == (clock_t) (-1)) { | |
| 1029 return false; | |
| 1030 } else { | |
| 1031 double ticks_per_second = (double) clock_tics_per_sec; | |
| 1032 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
| 1033 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
| 1034 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
| 1035 | |
| 1036 return true; | |
| 1037 } | |
| 1038 } | |
| 1039 | |
| 1040 | |
| 1041 char * os::local_time_string(char *buf, size_t buflen) { | |
| 1042 struct tm t; | |
| 1043 time_t long_time; | |
| 1044 time(&long_time); | |
| 1045 localtime_r(&long_time, &t); | |
| 1046 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 1047 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
| 1048 t.tm_hour, t.tm_min, t.tm_sec); | |
| 1049 return buf; | |
| 1050 } | |
| 1051 | |
| 1052 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
| 1053 return localtime_r(clock, res); | |
| 1054 } | |
| 1055 | |
| 1056 //////////////////////////////////////////////////////////////////////////////// | |
| 1057 // runtime exit support | |
| 1058 | |
| 1059 // Note: os::shutdown() might be called very early during initialization, or | |
| 1060 // called from signal handler. Before adding something to os::shutdown(), make | |
| 1061 // sure it is async-safe and can handle partially initialized VM. | |
| 1062 void os::shutdown() { | |
| 1063 | |
| 1064 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 1065 perfMemory_exit(); | |
| 1066 | |
| 1067 // needs to remove object in file system | |
| 1068 AttachListener::abort(); | |
| 1069 | |
| 1070 // flush buffered output, finish log files | |
| 1071 ostream_abort(); | |
| 1072 | |
| 1073 // Check for abort hook | |
| 1074 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 1075 if (abort_hook != NULL) { | |
| 1076 abort_hook(); | |
| 1077 } | |
| 1078 | |
| 1079 } | |
| 1080 | |
| 1081 // Note: os::abort() might be called very early during initialization, or | |
| 1082 // called from signal handler. Before adding something to os::abort(), make | |
| 1083 // sure it is async-safe and can handle partially initialized VM. | |
| 1084 void os::abort(bool dump_core) { | |
| 1085 os::shutdown(); | |
| 1086 if (dump_core) { | |
| 1087 #ifndef PRODUCT | |
| 1088 fdStream out(defaultStream::output_fd()); | |
| 1089 out.print_raw("Current thread is "); | |
| 1090 char buf[16]; | |
| 1091 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
| 1092 out.print_raw_cr(buf); | |
| 1093 out.print_raw_cr("Dumping core ..."); | |
| 1094 #endif | |
| 1095 ::abort(); // dump core | |
| 1096 } | |
| 1097 | |
| 1098 ::exit(1); | |
| 1099 } | |
| 1100 | |
| 1101 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 1102 void os::die() { | |
| 1103 // _exit() on BsdThreads only kills current thread | |
| 1104 ::abort(); | |
| 1105 } | |
| 1106 | |
| 1107 // unused on bsd for now. | |
| 1108 void os::set_error_file(const char *logfile) {} | |
| 1109 | |
| 1110 | |
| 1111 // This method is a copy of JDK's sysGetLastErrorString | |
| 1112 // from src/solaris/hpi/src/system_md.c | |
| 1113 | |
| 1114 size_t os::lasterror(char *buf, size_t len) { | |
| 1115 | |
| 1116 if (errno == 0) return 0; | |
| 1117 | |
| 1118 const char *s = ::strerror(errno); | |
| 1119 size_t n = ::strlen(s); | |
| 1120 if (n >= len) { | |
| 1121 n = len - 1; | |
| 1122 } | |
| 1123 ::strncpy(buf, s, n); | |
| 1124 buf[n] = '\0'; | |
| 1125 return n; | |
| 1126 } | |
| 1127 | |
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1128 intx os::current_thread_id() { |
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1129 #ifdef __APPLE__ |
| 12095 | 1130 return (intx)::pthread_mach_thread_np(::pthread_self()); |
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1131 #else |
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1132 return (intx)::pthread_self(); |
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1133 #endif |
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1134 } |
| 3960 | 1135 int os::current_process_id() { |
| 1136 | |
| 1137 // Under the old bsd thread library, bsd gives each thread | |
| 1138 // its own process id. Because of this each thread will return | |
| 1139 // a different pid if this method were to return the result | |
| 1140 // of getpid(2). Bsd provides no api that returns the pid | |
| 1141 // of the launcher thread for the vm. This implementation | |
| 1142 // returns a unique pid, the pid of the launcher thread | |
| 1143 // that starts the vm 'process'. | |
| 1144 | |
| 1145 // Under the NPTL, getpid() returns the same pid as the | |
| 1146 // launcher thread rather than a unique pid per thread. | |
| 1147 // Use gettid() if you want the old pre NPTL behaviour. | |
| 1148 | |
| 1149 // if you are looking for the result of a call to getpid() that | |
| 1150 // returns a unique pid for the calling thread, then look at the | |
| 1151 // OSThread::thread_id() method in osThread_bsd.hpp file | |
| 1152 | |
| 1153 return (int)(_initial_pid ? _initial_pid : getpid()); | |
| 1154 } | |
| 1155 | |
| 1156 // DLL functions | |
| 1157 | |
| 1158 #define JNI_LIB_PREFIX "lib" | |
| 1159 #ifdef __APPLE__ | |
| 1160 #define JNI_LIB_SUFFIX ".dylib" | |
| 1161 #else | |
| 1162 #define JNI_LIB_SUFFIX ".so" | |
| 1163 #endif | |
| 1164 | |
| 1165 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
| 1166 | |
| 1167 // This must be hard coded because it's the system's temporary | |
| 1168 // directory not the java application's temp directory, ala java.io.tmpdir. | |
| 4006 | 1169 #ifdef __APPLE__ |
| 1170 // macosx has a secure per-user temporary directory | |
| 1171 char temp_path_storage[PATH_MAX]; | |
| 1172 const char* os::get_temp_directory() { | |
| 1173 static char *temp_path = NULL; | |
| 1174 if (temp_path == NULL) { | |
| 1175 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
| 1176 if (pathSize == 0 || pathSize > PATH_MAX) { | |
| 1177 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
| 1178 } | |
| 1179 temp_path = temp_path_storage; | |
| 1180 } | |
| 1181 return temp_path; | |
| 1182 } | |
| 1183 #else /* __APPLE__ */ | |
| 3960 | 1184 const char* os::get_temp_directory() { return "/tmp"; } |
| 4006 | 1185 #endif /* __APPLE__ */ |
| 3960 | 1186 |
| 1187 static bool file_exists(const char* filename) { | |
| 1188 struct stat statbuf; | |
| 1189 if (filename == NULL || strlen(filename) == 0) { | |
| 1190 return false; | |
| 1191 } | |
| 1192 return os::stat(filename, &statbuf) == 0; | |
| 1193 } | |
| 1194 | |
|
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1195 bool os::dll_build_name(char* buffer, size_t buflen, |
| 3960 | 1196 const char* pname, const char* fname) { |
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1197 bool retval = false; |
| 3960 | 1198 // Copied from libhpi |
| 1199 const size_t pnamelen = pname ? strlen(pname) : 0; | |
| 1200 | |
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1201 // Return error on buffer overflow. |
| 3960 | 1202 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1203 return retval; |
| 3960 | 1204 } |
| 1205 | |
| 1206 if (pnamelen == 0) { | |
| 1207 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1208 retval = true; |
| 3960 | 1209 } else if (strchr(pname, *os::path_separator()) != NULL) { |
| 1210 int n; | |
| 1211 char** pelements = split_path(pname, &n); | |
|
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1212 if (pelements == NULL) { |
| 9062 | 1213 return false; |
|
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1214 } |
| 3960 | 1215 for (int i = 0 ; i < n ; i++) { |
| 1216 // Really shouldn't be NULL, but check can't hurt | |
| 1217 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
| 1218 continue; // skip the empty path values | |
| 1219 } | |
| 1220 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
| 1221 pelements[i], fname); | |
| 1222 if (file_exists(buffer)) { | |
|
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1223 retval = true; |
| 3960 | 1224 break; |
| 1225 } | |
| 1226 } | |
| 1227 // release the storage | |
| 1228 for (int i = 0 ; i < n ; i++) { | |
| 1229 if (pelements[i] != NULL) { | |
| 6197 | 1230 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| 3960 | 1231 } |
| 1232 } | |
| 1233 if (pelements != NULL) { | |
| 6197 | 1234 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| 3960 | 1235 } |
| 1236 } else { | |
| 1237 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
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1238 retval = true; |
| 3960 | 1239 } |
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1240 return retval; |
| 3960 | 1241 } |
| 1242 | |
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1243 // check if addr is inside libjvm.so |
| 3960 | 1244 bool os::address_is_in_vm(address addr) { |
| 1245 static address libjvm_base_addr; | |
| 1246 Dl_info dlinfo; | |
| 1247 | |
| 1248 if (libjvm_base_addr == NULL) { | |
|
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1249 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { |
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1250 libjvm_base_addr = (address)dlinfo.dli_fbase; |
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1251 } |
| 3960 | 1252 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); |
| 1253 } | |
| 1254 | |
|
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1255 if (dladdr((void *)addr, &dlinfo) != 0) { |
| 3960 | 1256 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; |
| 1257 } | |
| 1258 | |
| 1259 return false; | |
| 1260 } | |
| 1261 | |
| 6258 | 1262 |
| 1263 #define MACH_MAXSYMLEN 256 | |
| 1264 | |
| 3960 | 1265 bool os::dll_address_to_function_name(address addr, char *buf, |
| 1266 int buflen, int *offset) { | |
|
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1267 // buf is not optional, but offset is optional |
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1268 assert(buf != NULL, "sanity check"); |
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1269 |
| 3960 | 1270 Dl_info dlinfo; |
| 6258 | 1271 char localbuf[MACH_MAXSYMLEN]; |
| 1272 | |
|
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1273 if (dladdr((void*)addr, &dlinfo) != 0) { |
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1274 // see if we have a matching symbol |
|
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|
1275 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { |
|
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|
1276 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { |
| 3960 | 1277 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); |
| 1278 } | |
|
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|
1279 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; |
|
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|
1280 return true; |
|
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|
1281 } |
|
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|
1282 // no matching symbol so try for just file info |
|
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|
1283 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { |
|
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|
1284 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), |
|
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|
1285 buf, buflen, offset, dlinfo.dli_fname)) { |
|
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|
1286 return true; |
|
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|
1287 } |
| 3960 | 1288 } |
|
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|
1289 |
|
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|
1290 // Handle non-dynamic manually: |
|
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|
1291 if (dlinfo.dli_fbase != NULL && |
|
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|
1292 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, |
|
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|
1293 dlinfo.dli_fbase)) { |
|
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1294 if (!Decoder::demangle(localbuf, buf, buflen)) { |
|
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|
1295 jio_snprintf(buf, buflen, "%s", localbuf); |
|
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|
1296 } |
|
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|
1297 return true; |
| 3960 | 1298 } |
| 1299 } | |
|
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|
1300 buf[0] = '\0'; |
| 3960 | 1301 if (offset != NULL) *offset = -1; |
| 1302 return false; | |
| 1303 } | |
| 1304 | |
| 1305 // ported from solaris version | |
| 1306 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1307 int buflen, int* offset) { | |
|
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1308 // buf is not optional, but offset is optional |
|
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|
1309 assert(buf != NULL, "sanity check"); |
|
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|
1310 |
| 3960 | 1311 Dl_info dlinfo; |
| 1312 | |
|
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1313 if (dladdr((void*)addr, &dlinfo) != 0) { |
|
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1314 if (dlinfo.dli_fname != NULL) { |
|
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1315 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); |
|
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|
1316 } |
|
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1317 if (dlinfo.dli_fbase != NULL && offset != NULL) { |
|
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1318 *offset = addr - (address)dlinfo.dli_fbase; |
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|
1319 } |
|
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1320 return true; |
| 3960 | 1321 } |
|
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|
1322 |
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|
1323 buf[0] = '\0'; |
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1324 if (offset) *offset = -1; |
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1325 return false; |
| 3960 | 1326 } |
| 6918 | 1327 |
| 1328 // Loads .dll/.so and | |
| 1329 // in case of error it checks if .dll/.so was built for the | |
| 1330 // same architecture as Hotspot is running on | |
| 3960 | 1331 |
| 1332 #ifdef __APPLE__ | |
| 1333 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
| 1334 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1335 if (result != NULL) { | |
| 1336 // Successful loading | |
| 1337 return result; | |
| 1338 } | |
| 1339 | |
| 1340 // Read system error message into ebuf | |
| 1341 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1342 ebuf[ebuflen-1]='\0'; | |
| 1343 | |
| 1344 return NULL; | |
| 1345 } | |
| 1346 #else | |
| 1347 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
| 1348 { | |
| 1349 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1350 if (result != NULL) { | |
| 1351 // Successful loading | |
| 1352 return result; | |
| 1353 } | |
| 1354 | |
| 1355 Elf32_Ehdr elf_head; | |
| 1356 | |
| 1357 // Read system error message into ebuf | |
| 1358 // It may or may not be overwritten below | |
| 1359 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1360 ebuf[ebuflen-1]='\0'; | |
| 1361 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
| 1362 char* diag_msg_buf=ebuf+strlen(ebuf); | |
| 1363 | |
| 1364 if (diag_msg_max_length==0) { | |
| 1365 // No more space in ebuf for additional diagnostics message | |
| 1366 return NULL; | |
| 1367 } | |
| 1368 | |
| 1369 | |
| 1370 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
| 1371 | |
| 1372 if (file_descriptor < 0) { | |
| 1373 // Can't open library, report dlerror() message | |
| 1374 return NULL; | |
| 1375 } | |
| 1376 | |
| 1377 bool failed_to_read_elf_head= | |
| 1378 (sizeof(elf_head)!= | |
| 1379 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
| 1380 | |
| 1381 ::close(file_descriptor); | |
| 1382 if (failed_to_read_elf_head) { | |
| 1383 // file i/o error - report dlerror() msg | |
| 1384 return NULL; | |
| 1385 } | |
| 1386 | |
| 1387 typedef struct { | |
| 1388 Elf32_Half code; // Actual value as defined in elf.h | |
| 1389 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
| 1390 char elf_class; // 32 or 64 bit | |
| 1391 char endianess; // MSB or LSB | |
| 1392 char* name; // String representation | |
| 1393 } arch_t; | |
| 1394 | |
| 1395 #ifndef EM_486 | |
| 1396 #define EM_486 6 /* Intel 80486 */ | |
| 1397 #endif | |
| 1398 | |
| 1399 #ifndef EM_MIPS_RS3_LE | |
| 1400 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
| 1401 #endif | |
| 1402 | |
| 1403 #ifndef EM_PPC64 | |
| 1404 #define EM_PPC64 21 /* PowerPC64 */ | |
| 1405 #endif | |
| 1406 | |
| 1407 #ifndef EM_S390 | |
| 1408 #define EM_S390 22 /* IBM System/390 */ | |
| 1409 #endif | |
| 1410 | |
| 1411 #ifndef EM_IA_64 | |
| 1412 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
| 1413 #endif | |
| 1414 | |
| 1415 #ifndef EM_X86_64 | |
| 1416 #define EM_X86_64 62 /* AMD x86-64 */ | |
| 1417 #endif | |
| 1418 | |
| 1419 static const arch_t arch_array[]={ | |
| 1420 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1421 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1422 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
| 1423 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
| 1424 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1425 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1426 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
| 1427 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
| 1428 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
| 1429 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
| 1430 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
| 1431 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
| 1432 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
| 1433 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
| 1434 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
| 1435 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
| 1436 }; | |
| 1437 | |
| 1438 #if (defined IA32) | |
| 1439 static Elf32_Half running_arch_code=EM_386; | |
| 1440 #elif (defined AMD64) | |
| 1441 static Elf32_Half running_arch_code=EM_X86_64; | |
| 1442 #elif (defined IA64) | |
| 1443 static Elf32_Half running_arch_code=EM_IA_64; | |
| 1444 #elif (defined __sparc) && (defined _LP64) | |
| 1445 static Elf32_Half running_arch_code=EM_SPARCV9; | |
| 1446 #elif (defined __sparc) && (!defined _LP64) | |
| 1447 static Elf32_Half running_arch_code=EM_SPARC; | |
| 1448 #elif (defined __powerpc64__) | |
| 1449 static Elf32_Half running_arch_code=EM_PPC64; | |
| 1450 #elif (defined __powerpc__) | |
| 1451 static Elf32_Half running_arch_code=EM_PPC; | |
| 1452 #elif (defined ARM) | |
| 1453 static Elf32_Half running_arch_code=EM_ARM; | |
| 1454 #elif (defined S390) | |
| 1455 static Elf32_Half running_arch_code=EM_S390; | |
| 1456 #elif (defined ALPHA) | |
| 1457 static Elf32_Half running_arch_code=EM_ALPHA; | |
| 1458 #elif (defined MIPSEL) | |
| 1459 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
| 1460 #elif (defined PARISC) | |
| 1461 static Elf32_Half running_arch_code=EM_PARISC; | |
| 1462 #elif (defined MIPS) | |
| 1463 static Elf32_Half running_arch_code=EM_MIPS; | |
| 1464 #elif (defined M68K) | |
| 1465 static Elf32_Half running_arch_code=EM_68K; | |
| 1466 #else | |
| 1467 #error Method os::dll_load requires that one of following is defined:\ | |
| 1468 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
| 1469 #endif | |
| 1470 | |
| 1471 // Identify compatability class for VM's architecture and library's architecture | |
| 1472 // Obtain string descriptions for architectures | |
| 1473 | |
| 1474 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
| 1475 int running_arch_index=-1; | |
| 1476 | |
| 1477 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
| 1478 if (running_arch_code == arch_array[i].code) { | |
| 1479 running_arch_index = i; | |
| 1480 } | |
| 1481 if (lib_arch.code == arch_array[i].code) { | |
| 1482 lib_arch.compat_class = arch_array[i].compat_class; | |
| 1483 lib_arch.name = arch_array[i].name; | |
| 1484 } | |
| 1485 } | |
| 1486 | |
| 1487 assert(running_arch_index != -1, | |
| 1488 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
| 1489 if (running_arch_index == -1) { | |
| 1490 // Even though running architecture detection failed | |
| 1491 // we may still continue with reporting dlerror() message | |
| 1492 return NULL; | |
| 1493 } | |
| 1494 | |
| 1495 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
| 1496 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
| 1497 return NULL; | |
| 1498 } | |
| 1499 | |
| 1500 #ifndef S390 | |
| 1501 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
| 1502 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
| 1503 return NULL; | |
| 1504 } | |
| 1505 #endif // !S390 | |
| 1506 | |
| 1507 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
| 1508 if ( lib_arch.name!=NULL ) { | |
| 1509 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1510 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
| 1511 lib_arch.name, arch_array[running_arch_index].name); | |
| 1512 } else { | |
| 1513 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1514 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
| 1515 lib_arch.code, | |
| 1516 arch_array[running_arch_index].name); | |
| 1517 } | |
| 1518 } | |
| 1519 | |
| 1520 return NULL; | |
| 1521 } | |
| 1522 #endif /* !__APPLE__ */ | |
| 1523 | |
| 1524 // XXX: Do we need a lock around this as per Linux? | |
| 1525 void* os::dll_lookup(void* handle, const char* name) { | |
| 1526 return dlsym(handle, name); | |
| 1527 } | |
| 1528 | |
| 1529 | |
| 1530 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
| 1531 int fd = ::open(filename, O_RDONLY); | |
| 1532 if (fd == -1) { | |
| 1533 return false; | |
| 1534 } | |
| 1535 | |
| 1536 char buf[32]; | |
| 1537 int bytes; | |
| 1538 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
| 1539 st->print_raw(buf, bytes); | |
| 1540 } | |
| 1541 | |
| 1542 ::close(fd); | |
| 1543 | |
| 1544 return true; | |
| 1545 } | |
| 1546 | |
| 1547 void os::print_dll_info(outputStream *st) { | |
|
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|
1548 st->print_cr("Dynamic libraries:"); |
| 3960 | 1549 #ifdef RTLD_DI_LINKMAP |
|
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|
1550 Dl_info dli; |
|
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|
1551 void *handle; |
|
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|
1552 Link_map *map; |
|
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|
1553 Link_map *p; |
|
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|
1554 |
|
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|
1555 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || |
|
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|
1556 dli.dli_fname == NULL) { |
|
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|
1557 st->print_cr("Error: Cannot print dynamic libraries."); |
|
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|
1558 return; |
|
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|
1559 } |
|
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|
1560 handle = dlopen(dli.dli_fname, RTLD_LAZY); |
|
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|
1561 if (handle == NULL) { |
|
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|
1562 st->print_cr("Error: Cannot print dynamic libraries."); |
|
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|
1563 return; |
|
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|
1564 } |
|
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|
1565 dlinfo(handle, RTLD_DI_LINKMAP, &map); |
|
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|
1566 if (map == NULL) { |
|
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|
1567 st->print_cr("Error: Cannot print dynamic libraries."); |
|
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|
1568 return; |
|
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|
1569 } |
|
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|
1570 |
|
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|
1571 while (map->l_prev != NULL) |
|
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|
1572 map = map->l_prev; |
|
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|
1573 |
|
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|
1574 while (map != NULL) { |
|
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|
1575 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); |
|
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|
1576 map = map->l_next; |
|
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|
1577 } |
|
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|
1578 |
|
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|
1579 dlclose(handle); |
| 3960 | 1580 #elif defined(__APPLE__) |
|
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|
1581 uint32_t count; |
|
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|
1582 uint32_t i; |
|
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|
1583 |
|
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|
1584 count = _dyld_image_count(); |
|
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1585 for (i = 1; i < count; i++) { |
|
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|
1586 const char *name = _dyld_get_image_name(i); |
|
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|
1587 intptr_t slide = _dyld_get_image_vmaddr_slide(i); |
|
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1588 st->print_cr(PTR_FORMAT " \t%s", slide, name); |
|
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|
1589 } |
| 3960 | 1590 #else |
|
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1591 st->print_cr("Error: Cannot print dynamic libraries."); |
| 3960 | 1592 #endif |
| 1593 } | |
| 1594 | |
|
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1595 void os::print_os_info_brief(outputStream* st) { |
|
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|
1596 st->print("Bsd"); |
|
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|
1597 |
|
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|
1598 os::Posix::print_uname_info(st); |
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|
1599 } |
| 3960 | 1600 |
| 1601 void os::print_os_info(outputStream* st) { | |
| 1602 st->print("OS:"); | |
|
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1603 st->print("Bsd"); |
|
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|
1604 |
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1605 os::Posix::print_uname_info(st); |
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|
1606 |
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|
1607 os::Posix::print_rlimit_info(st); |
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|
1608 |
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|
1609 os::Posix::print_load_average(st); |
| 3960 | 1610 } |
| 1611 | |
| 1612 void os::pd_print_cpu_info(outputStream* st) { | |
| 1613 // Nothing to do for now. | |
| 1614 } | |
| 1615 | |
| 1616 void os::print_memory_info(outputStream* st) { | |
| 1617 | |
| 1618 st->print("Memory:"); | |
| 1619 st->print(" %dk page", os::vm_page_size()>>10); | |
| 1620 | |
| 1621 st->print(", physical " UINT64_FORMAT "k", | |
| 1622 os::physical_memory() >> 10); | |
| 1623 st->print("(" UINT64_FORMAT "k free)", | |
| 1624 os::available_memory() >> 10); | |
| 1625 st->cr(); | |
| 1626 | |
| 1627 // meminfo | |
| 1628 st->print("\n/proc/meminfo:\n"); | |
| 1629 _print_ascii_file("/proc/meminfo", st); | |
| 1630 st->cr(); | |
| 1631 } | |
| 1632 | |
| 1633 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
| 1634 // but they're the same for all the bsd arch that we support | |
| 1635 // and they're the same for solaris but there's no common place to put this. | |
| 1636 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
| 1637 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
| 1638 "ILL_COPROC", "ILL_BADSTK" }; | |
| 1639 | |
| 1640 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
| 1641 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
| 1642 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
| 1643 | |
| 1644 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
| 1645 | |
| 1646 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
| 1647 | |
| 1648 void os::print_siginfo(outputStream* st, void* siginfo) { | |
| 1649 st->print("siginfo:"); | |
| 1650 | |
| 1651 const int buflen = 100; | |
| 1652 char buf[buflen]; | |
| 1653 siginfo_t *si = (siginfo_t*)siginfo; | |
| 1654 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
| 1655 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
| 1656 st->print("si_errno=%s", buf); | |
| 1657 } else { | |
| 1658 st->print("si_errno=%d", si->si_errno); | |
| 1659 } | |
| 1660 const int c = si->si_code; | |
| 1661 assert(c > 0, "unexpected si_code"); | |
| 1662 switch (si->si_signo) { | |
| 1663 case SIGILL: | |
| 1664 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
| 1665 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1666 break; | |
| 1667 case SIGFPE: | |
| 1668 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
| 1669 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1670 break; | |
| 1671 case SIGSEGV: | |
| 1672 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
| 1673 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1674 break; | |
| 1675 case SIGBUS: | |
| 1676 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
| 1677 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1678 break; | |
| 1679 default: | |
| 1680 st->print(", si_code=%d", si->si_code); | |
| 1681 // no si_addr | |
| 1682 } | |
| 1683 | |
| 1684 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
| 1685 UseSharedSpaces) { | |
| 1686 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 1687 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
| 1688 st->print("\n\nError accessing class data sharing archive." \ | |
| 1689 " Mapped file inaccessible during execution, " \ | |
| 1690 " possible disk/network problem."); | |
| 1691 } | |
| 1692 } | |
| 1693 st->cr(); | |
| 1694 } | |
| 1695 | |
| 1696 | |
| 1697 static void print_signal_handler(outputStream* st, int sig, | |
| 1698 char* buf, size_t buflen); | |
| 1699 | |
| 1700 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 1701 st->print_cr("Signal Handlers:"); | |
| 1702 print_signal_handler(st, SIGSEGV, buf, buflen); | |
| 1703 print_signal_handler(st, SIGBUS , buf, buflen); | |
| 1704 print_signal_handler(st, SIGFPE , buf, buflen); | |
| 1705 print_signal_handler(st, SIGPIPE, buf, buflen); | |
| 1706 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
| 1707 print_signal_handler(st, SIGILL , buf, buflen); | |
| 1708 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
| 1709 print_signal_handler(st, SR_signum, buf, buflen); | |
| 1710 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
| 1711 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
| 1712 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
| 1713 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
| 1714 } | |
| 1715 | |
| 1716 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
| 1717 | |
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1718 // Find the full path to the current module, libjvm |
| 3960 | 1719 void os::jvm_path(char *buf, jint buflen) { |
| 1720 // Error checking. | |
| 1721 if (buflen < MAXPATHLEN) { | |
| 1722 assert(false, "must use a large-enough buffer"); | |
| 1723 buf[0] = '\0'; | |
| 1724 return; | |
| 1725 } | |
| 1726 // Lazy resolve the path to current module. | |
| 1727 if (saved_jvm_path[0] != 0) { | |
| 1728 strcpy(buf, saved_jvm_path); | |
| 1729 return; | |
| 1730 } | |
| 1731 | |
| 1732 char dli_fname[MAXPATHLEN]; | |
| 1733 bool ret = dll_address_to_library_name( | |
| 1734 CAST_FROM_FN_PTR(address, os::jvm_path), | |
| 1735 dli_fname, sizeof(dli_fname), NULL); | |
|
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|
1736 assert(ret, "cannot locate libjvm"); |
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|
1737 char *rp = NULL; |
|
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1738 if (ret && dli_fname[0] != '\0') { |
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1739 rp = realpath(dli_fname, buf); |
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|
1740 } |
| 3960 | 1741 if (rp == NULL) |
| 1742 return; | |
| 1743 | |
| 1744 if (Arguments::created_by_gamma_launcher()) { | |
| 1745 // Support for the gamma launcher. Typical value for buf is | |
| 4846 | 1746 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
| 3960 | 1747 // the right place in the string, then assume we are installed in a JDK and |
| 4846 | 1748 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
| 1749 // construct a path to the JVM being overridden. | |
| 1750 | |
| 3960 | 1751 const char *p = buf + strlen(buf) - 1; |
| 1752 for (int count = 0; p > buf && count < 5; ++count) { | |
| 1753 for (--p; p > buf && *p != '/'; --p) | |
| 1754 /* empty */ ; | |
| 1755 } | |
| 1756 | |
| 1757 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
| 1758 // Look for JAVA_HOME in the environment. | |
| 1759 char* java_home_var = ::getenv("JAVA_HOME"); | |
| 1760 if (java_home_var != NULL && java_home_var[0] != 0) { | |
| 1761 char* jrelib_p; | |
| 1762 int len; | |
| 1763 | |
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|
1764 // Check the current module name "libjvm" |
| 3960 | 1765 p = strrchr(buf, '/'); |
| 1766 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
| 1767 | |
| 1768 rp = realpath(java_home_var, buf); | |
| 1769 if (rp == NULL) | |
| 1770 return; | |
| 1771 | |
| 1772 // determine if this is a legacy image or modules image | |
| 1773 // modules image doesn't have "jre" subdirectory | |
| 1774 len = strlen(buf); | |
| 1775 jrelib_p = buf + len; | |
| 4846 | 1776 |
| 1777 // Add the appropriate library subdir | |
| 1778 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
| 3960 | 1779 if (0 != access(buf, F_OK)) { |
| 4846 | 1780 snprintf(jrelib_p, buflen-len, "/lib"); |
| 3960 | 1781 } |
| 1782 | |
| 4846 | 1783 // Add the appropriate client or server subdir |
| 1784 len = strlen(buf); | |
| 1785 jrelib_p = buf + len; | |
| 1786 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
| 1787 if (0 != access(buf, F_OK)) { | |
| 1788 snprintf(jrelib_p, buflen-len, ""); | |
| 1789 } | |
| 1790 | |
| 1791 // If the path exists within JAVA_HOME, add the JVM library name | |
| 1792 // to complete the path to JVM being overridden. Otherwise fallback | |
| 1793 // to the path to the current library. | |
| 3960 | 1794 if (0 == access(buf, F_OK)) { |
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1795 // Use current module name "libjvm" |
| 3960 | 1796 len = strlen(buf); |
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1797 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
| 3960 | 1798 } else { |
| 4846 | 1799 // Fall back to path of current library |
| 3960 | 1800 rp = realpath(dli_fname, buf); |
| 1801 if (rp == NULL) | |
| 1802 return; | |
| 1803 } | |
| 1804 } | |
| 1805 } | |
| 1806 } | |
| 1807 | |
| 1808 strcpy(saved_jvm_path, buf); | |
| 1809 } | |
| 1810 | |
| 1811 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 1812 // no prefix required, not even "_" | |
| 1813 } | |
| 1814 | |
| 1815 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 1816 // no suffix required | |
| 1817 } | |
| 1818 | |
| 1819 //////////////////////////////////////////////////////////////////////////////// | |
| 1820 // sun.misc.Signal support | |
| 1821 | |
| 1822 static volatile jint sigint_count = 0; | |
| 1823 | |
| 1824 static void | |
| 1825 UserHandler(int sig, void *siginfo, void *context) { | |
| 1826 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
| 1827 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
| 1828 // don't want to flood the manager thread with sem_post requests. | |
| 1829 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
| 1830 return; | |
| 1831 | |
| 1832 // Ctrl-C is pressed during error reporting, likely because the error | |
| 1833 // handler fails to abort. Let VM die immediately. | |
| 1834 if (sig == SIGINT && is_error_reported()) { | |
| 1835 os::die(); | |
| 1836 } | |
| 1837 | |
| 1838 os::signal_notify(sig); | |
| 1839 } | |
| 1840 | |
| 1841 void* os::user_handler() { | |
| 1842 return CAST_FROM_FN_PTR(void*, UserHandler); | |
| 1843 } | |
| 1844 | |
| 1845 extern "C" { | |
| 1846 typedef void (*sa_handler_t)(int); | |
| 1847 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
| 1848 } | |
| 1849 | |
| 1850 void* os::signal(int signal_number, void* handler) { | |
| 1851 struct sigaction sigAct, oldSigAct; | |
| 1852 | |
| 1853 sigfillset(&(sigAct.sa_mask)); | |
| 1854 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 1855 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
| 1856 | |
| 1857 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
| 1858 // -1 means registration failed | |
| 1859 return (void *)-1; | |
| 1860 } | |
| 1861 | |
| 1862 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
| 1863 } | |
| 1864 | |
| 1865 void os::signal_raise(int signal_number) { | |
| 1866 ::raise(signal_number); | |
| 1867 } | |
| 1868 | |
| 1869 /* | |
| 1870 * The following code is moved from os.cpp for making this | |
| 1871 * code platform specific, which it is by its very nature. | |
| 1872 */ | |
| 1873 | |
| 1874 // Will be modified when max signal is changed to be dynamic | |
| 1875 int os::sigexitnum_pd() { | |
| 1876 return NSIG; | |
| 1877 } | |
| 1878 | |
| 1879 // a counter for each possible signal value | |
| 1880 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 1881 | |
| 1882 // Bsd(POSIX) specific hand shaking semaphore. | |
| 1883 #ifdef __APPLE__ | |
| 10405 | 1884 typedef semaphore_t os_semaphore_t; |
| 3960 | 1885 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) |
| 10405 | 1886 #define SEM_WAIT(sem) semaphore_wait(sem) |
| 1887 #define SEM_POST(sem) semaphore_signal(sem) | |
| 1888 #define SEM_DESTROY(sem) semaphore_destroy(mach_task_self(), sem) | |
| 3960 | 1889 #else |
| 10405 | 1890 typedef sem_t os_semaphore_t; |
| 3960 | 1891 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) |
| 10405 | 1892 #define SEM_WAIT(sem) sem_wait(&sem) |
| 1893 #define SEM_POST(sem) sem_post(&sem) | |
| 1894 #define SEM_DESTROY(sem) sem_destroy(&sem) | |
| 3960 | 1895 #endif |
| 1896 | |
| 10405 | 1897 class Semaphore : public StackObj { |
| 1898 public: | |
| 1899 Semaphore(); | |
| 1900 ~Semaphore(); | |
| 1901 void signal(); | |
| 1902 void wait(); | |
| 1903 bool trywait(); | |
| 1904 bool timedwait(unsigned int sec, int nsec); | |
| 1905 private: | |
| 1906 jlong currenttime() const; | |
| 1907 semaphore_t _semaphore; | |
| 1908 }; | |
| 1909 | |
| 1910 Semaphore::Semaphore() : _semaphore(0) { | |
| 1911 SEM_INIT(_semaphore, 0); | |
| 1912 } | |
| 1913 | |
| 1914 Semaphore::~Semaphore() { | |
| 1915 SEM_DESTROY(_semaphore); | |
| 1916 } | |
| 1917 | |
| 1918 void Semaphore::signal() { | |
| 1919 SEM_POST(_semaphore); | |
| 1920 } | |
| 1921 | |
| 1922 void Semaphore::wait() { | |
| 1923 SEM_WAIT(_semaphore); | |
| 1924 } | |
| 1925 | |
| 1926 jlong Semaphore::currenttime() const { | |
| 1927 struct timeval tv; | |
| 1928 gettimeofday(&tv, NULL); | |
| 1929 return (tv.tv_sec * NANOSECS_PER_SEC) + (tv.tv_usec * 1000); | |
| 1930 } | |
| 1931 | |
| 1932 #ifdef __APPLE__ | |
| 1933 bool Semaphore::trywait() { | |
| 1934 return timedwait(0, 0); | |
| 1935 } | |
| 1936 | |
| 1937 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
| 1938 kern_return_t kr = KERN_ABORTED; | |
| 1939 mach_timespec_t waitspec; | |
| 1940 waitspec.tv_sec = sec; | |
| 1941 waitspec.tv_nsec = nsec; | |
| 1942 | |
| 1943 jlong starttime = currenttime(); | |
| 1944 | |
| 1945 kr = semaphore_timedwait(_semaphore, waitspec); | |
| 1946 while (kr == KERN_ABORTED) { | |
| 1947 jlong totalwait = (sec * NANOSECS_PER_SEC) + nsec; | |
| 1948 | |
| 1949 jlong current = currenttime(); | |
| 1950 jlong passedtime = current - starttime; | |
| 1951 | |
| 1952 if (passedtime >= totalwait) { | |
| 1953 waitspec.tv_sec = 0; | |
| 1954 waitspec.tv_nsec = 0; | |
| 1955 } else { | |
| 1956 jlong waittime = totalwait - (current - starttime); | |
| 1957 waitspec.tv_sec = waittime / NANOSECS_PER_SEC; | |
| 1958 waitspec.tv_nsec = waittime % NANOSECS_PER_SEC; | |
| 1959 } | |
| 1960 | |
| 1961 kr = semaphore_timedwait(_semaphore, waitspec); | |
| 1962 } | |
| 1963 | |
| 1964 return kr == KERN_SUCCESS; | |
| 1965 } | |
| 1966 | |
| 1967 #else | |
| 1968 | |
| 1969 bool Semaphore::trywait() { | |
| 1970 return sem_trywait(&_semaphore) == 0; | |
| 1971 } | |
| 1972 | |
| 1973 bool Semaphore::timedwait(unsigned int sec, int nsec) { | |
| 1974 struct timespec ts; | |
| 1975 jlong endtime = unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); | |
| 1976 | |
| 1977 while (1) { | |
| 1978 int result = sem_timedwait(&_semaphore, &ts); | |
| 1979 if (result == 0) { | |
| 1980 return true; | |
| 1981 } else if (errno == EINTR) { | |
| 1982 continue; | |
| 1983 } else if (errno == ETIMEDOUT) { | |
| 1984 return false; | |
| 1985 } else { | |
| 1986 return false; | |
| 1987 } | |
| 1988 } | |
| 1989 } | |
| 1990 | |
| 1991 #endif // __APPLE__ | |
| 1992 | |
| 1993 static os_semaphore_t sig_sem; | |
| 1994 static Semaphore sr_semaphore; | |
| 1995 | |
| 3960 | 1996 void os::signal_init_pd() { |
| 1997 // Initialize signal structures | |
| 1998 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 1999 | |
| 2000 // Initialize signal semaphore | |
| 2001 ::SEM_INIT(sig_sem, 0); | |
| 2002 } | |
| 2003 | |
| 2004 void os::signal_notify(int sig) { | |
| 2005 Atomic::inc(&pending_signals[sig]); | |
| 2006 ::SEM_POST(sig_sem); | |
| 2007 } | |
| 2008 | |
| 2009 static int check_pending_signals(bool wait) { | |
| 2010 Atomic::store(0, &sigint_count); | |
| 2011 for (;;) { | |
| 2012 for (int i = 0; i < NSIG + 1; i++) { | |
| 2013 jint n = pending_signals[i]; | |
| 2014 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 2015 return i; | |
| 2016 } | |
| 2017 } | |
| 2018 if (!wait) { | |
| 2019 return -1; | |
| 2020 } | |
| 2021 JavaThread *thread = JavaThread::current(); | |
| 2022 ThreadBlockInVM tbivm(thread); | |
| 2023 | |
| 2024 bool threadIsSuspended; | |
| 2025 do { | |
| 2026 thread->set_suspend_equivalent(); | |
| 2027 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 2028 ::SEM_WAIT(sig_sem); | |
| 2029 | |
| 2030 // were we externally suspended while we were waiting? | |
| 2031 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 2032 if (threadIsSuspended) { | |
| 2033 // | |
| 2034 // The semaphore has been incremented, but while we were waiting | |
| 2035 // another thread suspended us. We don't want to continue running | |
| 2036 // while suspended because that would surprise the thread that | |
| 2037 // suspended us. | |
| 2038 // | |
| 2039 ::SEM_POST(sig_sem); | |
| 2040 | |
| 2041 thread->java_suspend_self(); | |
| 2042 } | |
| 2043 } while (threadIsSuspended); | |
| 2044 } | |
| 2045 } | |
| 2046 | |
| 2047 int os::signal_lookup() { | |
| 2048 return check_pending_signals(false); | |
| 2049 } | |
| 2050 | |
| 2051 int os::signal_wait() { | |
| 2052 return check_pending_signals(true); | |
| 2053 } | |
| 2054 | |
| 2055 //////////////////////////////////////////////////////////////////////////////// | |
| 2056 // Virtual Memory | |
| 2057 | |
| 2058 int os::vm_page_size() { | |
| 2059 // Seems redundant as all get out | |
| 2060 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 2061 return os::Bsd::page_size(); | |
| 2062 } | |
| 2063 | |
| 2064 // Solaris allocates memory by pages. | |
| 2065 int os::vm_allocation_granularity() { | |
| 2066 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 2067 return os::Bsd::page_size(); | |
| 2068 } | |
| 2069 | |
| 2070 // Rationale behind this function: | |
| 2071 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
| 2072 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
| 2073 // samples for JITted code. Here we create private executable mapping over the code cache | |
| 2074 // and then we can use standard (well, almost, as mapping can change) way to provide | |
| 2075 // info for the reporting script by storing timestamp and location of symbol | |
| 2076 void bsd_wrap_code(char* base, size_t size) { | |
| 2077 static volatile jint cnt = 0; | |
| 2078 | |
| 2079 if (!UseOprofile) { | |
| 2080 return; | |
| 2081 } | |
| 2082 | |
| 2083 char buf[PATH_MAX + 1]; | |
| 2084 int num = Atomic::add(1, &cnt); | |
| 2085 | |
| 2086 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
| 2087 os::get_temp_directory(), os::current_process_id(), num); | |
| 2088 unlink(buf); | |
| 2089 | |
| 2090 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
| 2091 | |
| 2092 if (fd != -1) { | |
| 2093 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
| 2094 if (rv != (off_t)-1) { | |
| 2095 if (::write(fd, "", 1) == 1) { | |
| 2096 mmap(base, size, | |
| 2097 PROT_READ|PROT_WRITE|PROT_EXEC, | |
| 2098 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
| 2099 } | |
| 2100 } | |
| 2101 ::close(fd); | |
| 2102 unlink(buf); | |
| 2103 } | |
| 2104 } | |
| 2105 | |
|
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2106 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, |
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2107 int err) { |
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2108 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT |
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2109 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, |
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2110 strerror(err), err); |
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2111 } |
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2112 |
| 3960 | 2113 // NOTE: Bsd kernel does not really reserve the pages for us. |
| 2114 // All it does is to check if there are enough free pages | |
| 2115 // left at the time of mmap(). This could be a potential | |
| 2116 // problem. | |
| 6197 | 2117 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| 3960 | 2118 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| 2119 #ifdef __OpenBSD__ | |
| 2120 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
|
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2121 if (::mprotect(addr, size, prot) == 0) { |
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2122 return true; |
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2123 } |
| 3960 | 2124 #else |
| 2125 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
| 2126 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
|
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2127 if (res != (uintptr_t) MAP_FAILED) { |
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2128 return true; |
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2129 } |
| 3960 | 2130 #endif |
|
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2131 |
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2132 // Warn about any commit errors we see in non-product builds just |
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2133 // in case mmap() doesn't work as described on the man page. |
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2134 NOT_PRODUCT(warn_fail_commit_memory(addr, size, exec, errno);) |
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2135 |
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2136 return false; |
| 3960 | 2137 } |
| 2138 | |
| 6197 | 2139 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| 3960 | 2140 bool exec) { |
|
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2141 // alignment_hint is ignored on this OS |
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2142 return pd_commit_memory(addr, size, exec); |
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2143 } |
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2144 |
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2145 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, |
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2146 const char* mesg) { |
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2147 assert(mesg != NULL, "mesg must be specified"); |
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2148 if (!pd_commit_memory(addr, size, exec)) { |
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2149 // add extra info in product mode for vm_exit_out_of_memory(): |
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2150 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) |
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2151 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, mesg); |
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2152 } |
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2153 } |
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2154 |
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2155 void os::pd_commit_memory_or_exit(char* addr, size_t size, |
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2156 size_t alignment_hint, bool exec, |
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2157 const char* mesg) { |
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2158 // alignment_hint is ignored on this OS |
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2159 pd_commit_memory_or_exit(addr, size, exec, mesg); |
| 3960 | 2160 } |
| 2161 | |
| 6197 | 2162 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2163 } |
| 2164 | |
| 6197 | 2165 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2166 ::madvise(addr, bytes, MADV_DONTNEED); |
| 2167 } | |
| 2168 | |
| 2169 void os::numa_make_global(char *addr, size_t bytes) { | |
| 2170 } | |
| 2171 | |
| 2172 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
| 2173 } | |
| 2174 | |
| 2175 bool os::numa_topology_changed() { return false; } | |
| 2176 | |
| 2177 size_t os::numa_get_groups_num() { | |
| 2178 return 1; | |
| 2179 } | |
| 2180 | |
| 2181 int os::numa_get_group_id() { | |
| 2182 return 0; | |
| 2183 } | |
| 2184 | |
| 2185 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
| 2186 if (size > 0) { | |
| 2187 ids[0] = 0; | |
| 2188 return 1; | |
| 2189 } | |
| 2190 return 0; | |
| 2191 } | |
| 2192 | |
| 2193 bool os::get_page_info(char *start, page_info* info) { | |
| 2194 return false; | |
| 2195 } | |
| 2196 | |
| 2197 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2198 return end; | |
| 2199 } | |
| 2200 | |
| 2201 | |
| 6197 | 2202 bool os::pd_uncommit_memory(char* addr, size_t size) { |
| 3960 | 2203 #ifdef __OpenBSD__ |
| 2204 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 2205 return ::mprotect(addr, size, PROT_NONE) == 0; | |
| 2206 #else | |
| 2207 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
| 2208 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
| 2209 return res != (uintptr_t) MAP_FAILED; | |
| 2210 #endif | |
| 2211 } | |
| 2212 | |
| 6197 | 2213 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
|
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2214 return os::commit_memory(addr, size, !ExecMem); |
| 3960 | 2215 } |
| 2216 | |
| 2217 // If this is a growable mapping, remove the guard pages entirely by | |
| 2218 // munmap()ping them. If not, just call uncommit_memory(). | |
| 2219 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
| 2220 return os::uncommit_memory(addr, size); | |
| 2221 } | |
| 2222 | |
| 2223 static address _highest_vm_reserved_address = NULL; | |
| 2224 | |
| 2225 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
| 2226 // at 'requested_addr'. If there are existing memory mappings at the same | |
| 2227 // location, however, they will be overwritten. If 'fixed' is false, | |
| 2228 // 'requested_addr' is only treated as a hint, the return value may or | |
| 2229 // may not start from the requested address. Unlike Bsd mmap(), this | |
| 2230 // function returns NULL to indicate failure. | |
| 2231 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
| 2232 char * addr; | |
| 2233 int flags; | |
| 2234 | |
| 2235 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
| 2236 if (fixed) { | |
| 2237 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
| 2238 flags |= MAP_FIXED; | |
| 2239 } | |
| 2240 | |
| 10157 | 2241 // Map reserved/uncommitted pages PROT_NONE so we fail early if we |
| 2242 // touch an uncommitted page. Otherwise, the read/write might | |
| 2243 // succeed if we have enough swap space to back the physical page. | |
| 2244 addr = (char*)::mmap(requested_addr, bytes, PROT_NONE, | |
| 3960 | 2245 flags, -1, 0); |
| 2246 | |
| 2247 if (addr != MAP_FAILED) { | |
| 2248 // anon_mmap() should only get called during VM initialization, | |
| 2249 // don't need lock (actually we can skip locking even it can be called | |
| 2250 // from multiple threads, because _highest_vm_reserved_address is just a | |
| 2251 // hint about the upper limit of non-stack memory regions.) | |
| 2252 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
| 2253 _highest_vm_reserved_address = (address)addr + bytes; | |
| 2254 } | |
| 2255 } | |
| 2256 | |
| 2257 return addr == MAP_FAILED ? NULL : addr; | |
| 2258 } | |
| 2259 | |
| 2260 // Don't update _highest_vm_reserved_address, because there might be memory | |
| 2261 // regions above addr + size. If so, releasing a memory region only creates | |
| 2262 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
| 2263 // | |
| 2264 static int anon_munmap(char * addr, size_t size) { | |
| 2265 return ::munmap(addr, size) == 0; | |
| 2266 } | |
| 2267 | |
| 6197 | 2268 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| 3960 | 2269 size_t alignment_hint) { |
| 2270 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
| 2271 } | |
| 2272 | |
| 6197 | 2273 bool os::pd_release_memory(char* addr, size_t size) { |
| 3960 | 2274 return anon_munmap(addr, size); |
| 2275 } | |
| 2276 | |
| 2277 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
| 2278 // Bsd wants the mprotect address argument to be page aligned. | |
| 2279 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
| 2280 | |
| 2281 // According to SUSv3, mprotect() should only be used with mappings | |
| 2282 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
| 2283 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
| 2284 // protection of malloc'ed or statically allocated memory). Check the | |
| 2285 // caller if you hit this assert. | |
| 2286 assert(addr == bottom, "sanity check"); | |
| 2287 | |
| 2288 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
| 2289 return ::mprotect(bottom, size, prot) == 0; | |
| 2290 } | |
| 2291 | |
| 2292 // Set protections specified | |
| 2293 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
| 2294 bool is_committed) { | |
| 2295 unsigned int p = 0; | |
| 2296 switch (prot) { | |
| 2297 case MEM_PROT_NONE: p = PROT_NONE; break; | |
| 2298 case MEM_PROT_READ: p = PROT_READ; break; | |
| 2299 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
| 2300 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
| 2301 default: | |
| 2302 ShouldNotReachHere(); | |
| 2303 } | |
| 2304 // is_committed is unused. | |
| 2305 return bsd_mprotect(addr, bytes, p); | |
| 2306 } | |
| 2307 | |
| 2308 bool os::guard_memory(char* addr, size_t size) { | |
| 2309 return bsd_mprotect(addr, size, PROT_NONE); | |
| 2310 } | |
| 2311 | |
| 2312 bool os::unguard_memory(char* addr, size_t size) { | |
| 2313 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
| 2314 } | |
| 2315 | |
| 2316 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
| 6918 | 2317 return false; |
| 3960 | 2318 } |
| 2319 | |
| 2320 // Large page support | |
| 2321 | |
| 2322 static size_t _large_page_size = 0; | |
| 2323 | |
| 2324 void os::large_page_init() { | |
| 2325 } | |
| 2326 | |
| 2327 | |
|
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2328 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { |
|
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2329 fatal("This code is not used or maintained."); |
|
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2330 |
| 3960 | 2331 // "exec" is passed in but not used. Creating the shared image for |
| 2332 // the code cache doesn't have an SHM_X executable permission to check. | |
| 2333 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
| 2334 | |
| 2335 key_t key = IPC_PRIVATE; | |
| 2336 char *addr; | |
| 2337 | |
| 2338 bool warn_on_failure = UseLargePages && | |
| 2339 (!FLAG_IS_DEFAULT(UseLargePages) || | |
| 2340 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
| 2341 ); | |
| 2342 char msg[128]; | |
| 2343 | |
| 2344 // Create a large shared memory region to attach to based on size. | |
| 2345 // Currently, size is the total size of the heap | |
| 2346 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
| 2347 if (shmid == -1) { | |
| 2348 // Possible reasons for shmget failure: | |
| 2349 // 1. shmmax is too small for Java heap. | |
| 2350 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
| 2351 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
| 2352 // 2. not enough large page memory. | |
| 2353 // > check available large pages: cat /proc/meminfo | |
| 2354 // > increase amount of large pages: | |
| 2355 // echo new_value > /proc/sys/vm/nr_hugepages | |
| 2356 // Note 1: different Bsd may use different name for this property, | |
| 2357 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
| 2358 // Note 2: it's possible there's enough physical memory available but | |
| 2359 // they are so fragmented after a long run that they can't | |
| 2360 // coalesce into large pages. Try to reserve large pages when | |
| 2361 // the system is still "fresh". | |
| 2362 if (warn_on_failure) { | |
| 2363 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
| 2364 warning(msg); | |
| 2365 } | |
| 2366 return NULL; | |
| 2367 } | |
| 2368 | |
| 2369 // attach to the region | |
| 2370 addr = (char*)shmat(shmid, req_addr, 0); | |
| 2371 int err = errno; | |
| 2372 | |
| 2373 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
| 2374 // will be deleted when it's detached by shmdt() or when the process | |
| 2375 // terminates. If shmat() is not successful this will remove the shared | |
| 2376 // segment immediately. | |
| 2377 shmctl(shmid, IPC_RMID, NULL); | |
| 2378 | |
| 2379 if ((intptr_t)addr == -1) { | |
| 2380 if (warn_on_failure) { | |
| 2381 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
| 2382 warning(msg); | |
| 2383 } | |
| 2384 return NULL; | |
| 2385 } | |
| 2386 | |
|
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2387 // The memory is committed |
|
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2388 MemTracker::record_virtual_memory_reserve_and_commit((address)addr, bytes, mtNone, CALLER_PC); |
|
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2389 |
| 3960 | 2390 return addr; |
| 2391 } | |
| 2392 | |
| 2393 bool os::release_memory_special(char* base, size_t bytes) { | |
|
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2394 MemTracker::Tracker tkr = MemTracker::get_virtual_memory_release_tracker(); |
| 3960 | 2395 // detaching the SHM segment will also delete it, see reserve_memory_special() |
| 2396 int rslt = shmdt(base); | |
|
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2397 if (rslt == 0) { |
|
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2398 tkr.record((address)base, bytes); |
|
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2399 return true; |
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2400 } else { |
|
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2401 tkr.discard(); |
|
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2402 return false; |
|
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2403 } |
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|
2404 |
| 3960 | 2405 } |
| 2406 | |
| 2407 size_t os::large_page_size() { | |
| 2408 return _large_page_size; | |
| 2409 } | |
| 2410 | |
| 2411 // HugeTLBFS allows application to commit large page memory on demand; | |
| 2412 // with SysV SHM the entire memory region must be allocated as shared | |
| 2413 // memory. | |
| 2414 bool os::can_commit_large_page_memory() { | |
| 2415 return UseHugeTLBFS; | |
| 2416 } | |
| 2417 | |
| 2418 bool os::can_execute_large_page_memory() { | |
| 2419 return UseHugeTLBFS; | |
| 2420 } | |
| 2421 | |
| 2422 // Reserve memory at an arbitrary address, only if that area is | |
| 2423 // available (and not reserved for something else). | |
| 2424 | |
| 6197 | 2425 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| 3960 | 2426 const int max_tries = 10; |
| 2427 char* base[max_tries]; | |
| 2428 size_t size[max_tries]; | |
| 2429 const size_t gap = 0x000000; | |
| 2430 | |
| 2431 // Assert only that the size is a multiple of the page size, since | |
| 2432 // that's all that mmap requires, and since that's all we really know | |
| 2433 // about at this low abstraction level. If we need higher alignment, | |
| 2434 // we can either pass an alignment to this method or verify alignment | |
| 2435 // in one of the methods further up the call chain. See bug 5044738. | |
| 2436 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
| 2437 | |
| 2438 // Repeatedly allocate blocks until the block is allocated at the | |
| 2439 // right spot. Give up after max_tries. Note that reserve_memory() will | |
| 2440 // automatically update _highest_vm_reserved_address if the call is | |
| 2441 // successful. The variable tracks the highest memory address every reserved | |
| 2442 // by JVM. It is used to detect heap-stack collision if running with | |
| 2443 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
| 2444 // space than needed, it could confuse the collision detecting code. To | |
| 2445 // solve the problem, save current _highest_vm_reserved_address and | |
| 2446 // calculate the correct value before return. | |
| 2447 address old_highest = _highest_vm_reserved_address; | |
| 2448 | |
| 2449 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
| 2450 // if kernel honors the hint then we can return immediately. | |
| 2451 char * addr = anon_mmap(requested_addr, bytes, false); | |
| 2452 if (addr == requested_addr) { | |
| 2453 return requested_addr; | |
| 2454 } | |
| 2455 | |
| 2456 if (addr != NULL) { | |
| 2457 // mmap() is successful but it fails to reserve at the requested address | |
| 2458 anon_munmap(addr, bytes); | |
| 2459 } | |
| 2460 | |
| 2461 int i; | |
| 2462 for (i = 0; i < max_tries; ++i) { | |
| 2463 base[i] = reserve_memory(bytes); | |
| 2464 | |
| 2465 if (base[i] != NULL) { | |
| 2466 // Is this the block we wanted? | |
| 2467 if (base[i] == requested_addr) { | |
| 2468 size[i] = bytes; | |
| 2469 break; | |
| 2470 } | |
| 2471 | |
| 2472 // Does this overlap the block we wanted? Give back the overlapped | |
| 2473 // parts and try again. | |
| 2474 | |
| 2475 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
| 2476 if (top_overlap >= 0 && top_overlap < bytes) { | |
| 2477 unmap_memory(base[i], top_overlap); | |
| 2478 base[i] += top_overlap; | |
| 2479 size[i] = bytes - top_overlap; | |
| 2480 } else { | |
| 2481 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
| 2482 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
| 2483 unmap_memory(requested_addr, bottom_overlap); | |
| 2484 size[i] = bytes - bottom_overlap; | |
| 2485 } else { | |
| 2486 size[i] = bytes; | |
| 2487 } | |
| 2488 } | |
| 2489 } | |
| 2490 } | |
| 2491 | |
| 2492 // Give back the unused reserved pieces. | |
| 2493 | |
| 2494 for (int j = 0; j < i; ++j) { | |
| 2495 if (base[j] != NULL) { | |
| 2496 unmap_memory(base[j], size[j]); | |
| 2497 } | |
| 2498 } | |
| 2499 | |
| 2500 if (i < max_tries) { | |
| 2501 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
| 2502 return requested_addr; | |
| 2503 } else { | |
| 2504 _highest_vm_reserved_address = old_highest; | |
| 2505 return NULL; | |
| 2506 } | |
| 2507 } | |
| 2508 | |
| 2509 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 2510 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
| 2511 } | |
| 2512 | |
| 2513 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
| 2514 // Solaris uses poll(), bsd uses park(). | |
| 2515 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
| 2516 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
| 2517 // SIGSEGV, see 4355769. | |
| 2518 | |
| 2519 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
| 2520 assert(thread == Thread::current(), "thread consistency check"); | |
| 2521 | |
| 2522 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2523 slp->reset() ; | |
| 2524 OrderAccess::fence() ; | |
| 2525 | |
| 2526 if (interruptible) { | |
| 2527 jlong prevtime = javaTimeNanos(); | |
| 2528 | |
| 2529 for (;;) { | |
| 2530 if (os::is_interrupted(thread, true)) { | |
| 2531 return OS_INTRPT; | |
| 2532 } | |
| 2533 | |
| 2534 jlong newtime = javaTimeNanos(); | |
| 2535 | |
| 2536 if (newtime - prevtime < 0) { | |
| 2537 // time moving backwards, should only happen if no monotonic clock | |
| 2538 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2539 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2540 } else { | |
|
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2541 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2542 } |
| 2543 | |
| 2544 if(millis <= 0) { | |
| 2545 return OS_OK; | |
| 2546 } | |
| 2547 | |
| 2548 prevtime = newtime; | |
| 2549 | |
| 2550 { | |
| 2551 assert(thread->is_Java_thread(), "sanity check"); | |
| 2552 JavaThread *jt = (JavaThread *) thread; | |
| 2553 ThreadBlockInVM tbivm(jt); | |
| 2554 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
| 2555 | |
| 2556 jt->set_suspend_equivalent(); | |
| 2557 // cleared by handle_special_suspend_equivalent_condition() or | |
| 2558 // java_suspend_self() via check_and_wait_while_suspended() | |
| 2559 | |
| 2560 slp->park(millis); | |
| 2561 | |
| 2562 // were we externally suspended while we were waiting? | |
| 2563 jt->check_and_wait_while_suspended(); | |
| 2564 } | |
| 2565 } | |
| 2566 } else { | |
| 2567 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 2568 jlong prevtime = javaTimeNanos(); | |
| 2569 | |
| 2570 for (;;) { | |
| 2571 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
| 2572 // the 1st iteration ... | |
| 2573 jlong newtime = javaTimeNanos(); | |
| 2574 | |
| 2575 if (newtime - prevtime < 0) { | |
| 2576 // time moving backwards, should only happen if no monotonic clock | |
| 2577 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2578 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2579 } else { | |
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2580 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2581 } |
| 2582 | |
| 2583 if(millis <= 0) break ; | |
| 2584 | |
| 2585 prevtime = newtime; | |
| 2586 slp->park(millis); | |
| 2587 } | |
| 2588 return OS_OK ; | |
| 2589 } | |
| 2590 } | |
| 2591 | |
| 2592 int os::naked_sleep() { | |
| 2593 // %% make the sleep time an integer flag. for now use 1 millisec. | |
| 2594 return os::sleep(Thread::current(), 1, false); | |
| 2595 } | |
| 2596 | |
| 2597 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 2598 void os::infinite_sleep() { | |
| 2599 while (true) { // sleep forever ... | |
| 2600 ::sleep(100); // ... 100 seconds at a time | |
| 2601 } | |
| 2602 } | |
| 2603 | |
| 2604 // Used to convert frequent JVM_Yield() to nops | |
| 2605 bool os::dont_yield() { | |
| 2606 return DontYieldALot; | |
| 2607 } | |
| 2608 | |
| 2609 void os::yield() { | |
| 2610 sched_yield(); | |
| 2611 } | |
| 2612 | |
| 2613 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
| 2614 | |
| 2615 void os::yield_all(int attempts) { | |
| 2616 // Yields to all threads, including threads with lower priorities | |
| 2617 // Threads on Bsd are all with same priority. The Solaris style | |
| 2618 // os::yield_all() with nanosleep(1ms) is not necessary. | |
| 2619 sched_yield(); | |
| 2620 } | |
| 2621 | |
| 2622 // Called from the tight loops to possibly influence time-sharing heuristics | |
| 2623 void os::loop_breaker(int attempts) { | |
| 2624 os::yield_all(attempts); | |
| 2625 } | |
| 2626 | |
| 2627 //////////////////////////////////////////////////////////////////////////////// | |
| 2628 // thread priority support | |
| 2629 | |
| 2630 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
| 2631 // only supports dynamic priority, static priority must be zero. For real-time | |
| 2632 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
| 2633 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
| 2634 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
| 2635 // of 5 runs - Sep 2005). | |
| 2636 // | |
| 2637 // The following code actually changes the niceness of kernel-thread/LWP. It | |
| 2638 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
| 2639 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
| 2640 // threads. It has always been the case, but could change in the future. For | |
| 2641 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
| 2642 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
| 2643 | |
| 6918 | 2644 #if !defined(__APPLE__) |
|
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2645 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2646 19, // 0 Entry should never be used |
| 2647 | |
| 2648 0, // 1 MinPriority | |
| 2649 3, // 2 | |
| 2650 6, // 3 | |
| 2651 | |
|
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2652 10, // 4 |
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2653 15, // 5 NormPriority |
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2654 18, // 6 |
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2655 |
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2656 21, // 7 |
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2657 25, // 8 |
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2658 28, // 9 NearMaxPriority |
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2659 |
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2660 31, // 10 MaxPriority |
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2661 |
|
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2662 31 // 11 CriticalPriority |
| 3960 | 2663 }; |
| 6918 | 2664 #else |
| 3960 | 2665 /* Using Mach high-level priority assignments */ |
|
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2666 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2667 0, // 0 Entry should never be used (MINPRI_USER) |
| 2668 | |
| 2669 27, // 1 MinPriority | |
| 2670 28, // 2 | |
| 2671 29, // 3 | |
| 2672 | |
| 2673 30, // 4 | |
| 2674 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
| 2675 32, // 6 | |
| 2676 | |
| 2677 33, // 7 | |
| 2678 34, // 8 | |
| 2679 35, // 9 NearMaxPriority | |
| 2680 | |
|
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2681 36, // 10 MaxPriority |
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2682 |
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2683 36 // 11 CriticalPriority |
| 3960 | 2684 }; |
| 2685 #endif | |
| 2686 | |
| 2687 static int prio_init() { | |
| 2688 if (ThreadPriorityPolicy == 1) { | |
| 2689 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
| 2690 // if effective uid is not root. Perhaps, a more elegant way of doing | |
| 2691 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
| 2692 if (geteuid() != 0) { | |
| 2693 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
| 2694 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
| 2695 } | |
| 2696 ThreadPriorityPolicy = 0; | |
| 2697 } | |
| 2698 } | |
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2699 if (UseCriticalJavaThreadPriority) { |
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2700 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
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2701 } |
| 3960 | 2702 return 0; |
| 2703 } | |
| 2704 | |
| 2705 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
| 2706 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
| 2707 | |
| 2708 #ifdef __OpenBSD__ | |
| 2709 // OpenBSD pthread_setprio starves low priority threads | |
| 2710 return OS_OK; | |
| 2711 #elif defined(__FreeBSD__) | |
| 2712 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
| 2713 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2714 struct sched_param sp; | |
| 2715 int policy; | |
| 2716 pthread_t self = pthread_self(); | |
| 2717 | |
| 2718 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
| 2719 return OS_ERR; | |
| 2720 | |
| 2721 sp.sched_priority = newpri; | |
| 2722 if (pthread_setschedparam(self, policy, &sp) != 0) | |
| 2723 return OS_ERR; | |
| 2724 | |
| 2725 return OS_OK; | |
| 2726 #else | |
| 2727 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
| 2728 return (ret == 0) ? OS_OK : OS_ERR; | |
| 2729 #endif | |
| 2730 } | |
| 2731 | |
| 2732 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
| 2733 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
| 2734 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 2735 return OS_OK; | |
| 2736 } | |
| 2737 | |
| 2738 errno = 0; | |
| 2739 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
| 2740 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
| 2741 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2742 int policy; | |
| 2743 struct sched_param sp; | |
| 2744 | |
| 2745 pthread_getschedparam(pthread_self(), &policy, &sp); | |
| 2746 *priority_ptr = sp.sched_priority; | |
| 2747 #else | |
| 2748 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
| 2749 #endif | |
| 2750 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
| 2751 } | |
| 2752 | |
| 2753 // Hint to the underlying OS that a task switch would not be good. | |
| 2754 // Void return because it's a hint and can fail. | |
| 2755 void os::hint_no_preempt() {} | |
| 2756 | |
| 2757 //////////////////////////////////////////////////////////////////////////////// | |
| 2758 // suspend/resume support | |
| 2759 | |
| 2760 // the low-level signal-based suspend/resume support is a remnant from the | |
| 2761 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
| 2762 // within hotspot. Now there is a single use-case for this: | |
| 2763 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
| 2764 // that runs in the watcher thread. | |
| 2765 // The remaining code is greatly simplified from the more general suspension | |
| 2766 // code that used to be used. | |
| 2767 // | |
| 2768 // The protocol is quite simple: | |
| 2769 // - suspend: | |
| 2770 // - sends a signal to the target thread | |
| 2771 // - polls the suspend state of the osthread using a yield loop | |
| 2772 // - target thread signal handler (SR_handler) sets suspend state | |
| 2773 // and blocks in sigsuspend until continued | |
| 2774 // - resume: | |
| 2775 // - sets target osthread state to continue | |
| 2776 // - sends signal to end the sigsuspend loop in the SR_handler | |
| 2777 // | |
| 2778 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
| 2779 // | |
| 2780 | |
| 2781 static void resume_clear_context(OSThread *osthread) { | |
| 2782 osthread->set_ucontext(NULL); | |
| 2783 osthread->set_siginfo(NULL); | |
| 2784 } | |
| 2785 | |
| 2786 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
| 2787 osthread->set_ucontext(context); | |
| 2788 osthread->set_siginfo(siginfo); | |
| 2789 } | |
| 2790 | |
| 2791 // | |
| 2792 // Handler function invoked when a thread's execution is suspended or | |
| 2793 // resumed. We have to be careful that only async-safe functions are | |
| 2794 // called here (Note: most pthread functions are not async safe and | |
| 2795 // should be avoided.) | |
| 2796 // | |
| 2797 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
| 2798 // interface point of view, but sigwait() prevents the signal hander | |
| 2799 // from being run. libpthread would get very confused by not having | |
| 2800 // its signal handlers run and prevents sigwait()'s use with the | |
| 2801 // mutex granting granting signal. | |
| 2802 // | |
| 10405 | 2803 // Currently only ever called on the VMThread or JavaThread |
| 3960 | 2804 // |
| 2805 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
| 2806 // Save and restore errno to avoid confusing native code with EINTR | |
| 2807 // after sigsuspend. | |
| 2808 int old_errno = errno; | |
| 2809 | |
| 2810 Thread* thread = Thread::current(); | |
| 2811 OSThread* osthread = thread->osthread(); | |
| 10405 | 2812 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); |
| 2813 | |
| 2814 os::SuspendResume::State current = osthread->sr.state(); | |
| 2815 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { | |
| 3960 | 2816 suspend_save_context(osthread, siginfo, context); |
| 2817 | |
| 10405 | 2818 // attempt to switch the state, we assume we had a SUSPEND_REQUEST |
| 2819 os::SuspendResume::State state = osthread->sr.suspended(); | |
| 2820 if (state == os::SuspendResume::SR_SUSPENDED) { | |
| 2821 sigset_t suspend_set; // signals for sigsuspend() | |
| 2822 | |
| 2823 // get current set of blocked signals and unblock resume signal | |
| 2824 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
| 2825 sigdelset(&suspend_set, SR_signum); | |
| 2826 | |
| 2827 sr_semaphore.signal(); | |
| 2828 // wait here until we are resumed | |
| 2829 while (1) { | |
| 2830 sigsuspend(&suspend_set); | |
| 2831 | |
| 2832 os::SuspendResume::State result = osthread->sr.running(); | |
| 2833 if (result == os::SuspendResume::SR_RUNNING) { | |
| 2834 sr_semaphore.signal(); | |
| 2835 break; | |
| 2836 } else if (result != os::SuspendResume::SR_SUSPENDED) { | |
| 2837 ShouldNotReachHere(); | |
| 2838 } | |
| 2839 } | |
| 2840 | |
| 2841 } else if (state == os::SuspendResume::SR_RUNNING) { | |
| 2842 // request was cancelled, continue | |
| 2843 } else { | |
| 2844 ShouldNotReachHere(); | |
| 2845 } | |
| 3960 | 2846 |
| 2847 resume_clear_context(osthread); | |
| 10405 | 2848 } else if (current == os::SuspendResume::SR_RUNNING) { |
| 2849 // request was cancelled, continue | |
| 2850 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 2851 // ignore | |
| 3960 | 2852 } else { |
| 10405 | 2853 // ignore |
| 3960 | 2854 } |
| 2855 | |
| 2856 errno = old_errno; | |
| 2857 } | |
| 2858 | |
| 2859 | |
| 2860 static int SR_initialize() { | |
| 2861 struct sigaction act; | |
| 2862 char *s; | |
| 2863 /* Get signal number to use for suspend/resume */ | |
| 2864 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
| 2865 int sig = ::strtol(s, 0, 10); | |
| 2866 if (sig > 0 || sig < NSIG) { | |
| 2867 SR_signum = sig; | |
| 2868 } | |
| 2869 } | |
| 2870 | |
| 2871 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
| 2872 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
| 2873 | |
| 2874 sigemptyset(&SR_sigset); | |
| 2875 sigaddset(&SR_sigset, SR_signum); | |
| 2876 | |
| 2877 /* Set up signal handler for suspend/resume */ | |
| 2878 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 2879 act.sa_handler = (void (*)(int)) SR_handler; | |
| 2880 | |
| 2881 // SR_signum is blocked by default. | |
| 2882 // 4528190 - We also need to block pthread restart signal (32 on all | |
| 2883 // supported Bsd platforms). Note that BsdThreads need to block | |
| 2884 // this signal for all threads to work properly. So we don't have | |
| 2885 // to use hard-coded signal number when setting up the mask. | |
| 2886 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
| 2887 | |
| 2888 if (sigaction(SR_signum, &act, 0) == -1) { | |
| 2889 return -1; | |
| 2890 } | |
| 2891 | |
| 2892 // Save signal flag | |
| 2893 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
| 2894 return 0; | |
| 2895 } | |
| 2896 | |
| 10405 | 2897 static int sr_notify(OSThread* osthread) { |
| 2898 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 2899 assert_status(status == 0, status, "pthread_kill"); | |
| 2900 return status; | |
| 2901 } | |
| 2902 | |
| 2903 // "Randomly" selected value for how long we want to spin | |
| 2904 // before bailing out on suspending a thread, also how often | |
| 2905 // we send a signal to a thread we want to resume | |
| 2906 static const int RANDOMLY_LARGE_INTEGER = 1000000; | |
| 2907 static const int RANDOMLY_LARGE_INTEGER2 = 100; | |
| 3960 | 2908 |
| 2909 // returns true on success and false on error - really an error is fatal | |
| 2910 // but this seems the normal response to library errors | |
| 2911 static bool do_suspend(OSThread* osthread) { | |
| 10405 | 2912 assert(osthread->sr.is_running(), "thread should be running"); |
| 2913 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); | |
| 2914 | |
| 3960 | 2915 // mark as suspended and send signal |
| 10405 | 2916 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { |
| 2917 // failed to switch, state wasn't running? | |
| 2918 ShouldNotReachHere(); | |
| 3960 | 2919 return false; |
| 2920 } | |
| 10405 | 2921 |
| 2922 if (sr_notify(osthread) != 0) { | |
| 2923 ShouldNotReachHere(); | |
| 2924 } | |
| 2925 | |
| 2926 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED | |
| 2927 while (true) { | |
| 2928 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 2929 break; | |
| 2930 } else { | |
| 2931 // timeout | |
| 2932 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); | |
| 2933 if (cancelled == os::SuspendResume::SR_RUNNING) { | |
| 2934 return false; | |
| 2935 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { | |
| 2936 // make sure that we consume the signal on the semaphore as well | |
| 2937 sr_semaphore.wait(); | |
| 2938 break; | |
| 2939 } else { | |
| 2940 ShouldNotReachHere(); | |
| 2941 return false; | |
| 2942 } | |
| 2943 } | |
| 2944 } | |
| 2945 | |
| 2946 guarantee(osthread->sr.is_suspended(), "Must be suspended"); | |
| 2947 return true; | |
| 3960 | 2948 } |
| 2949 | |
| 2950 static void do_resume(OSThread* osthread) { | |
| 2951 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
| 10405 | 2952 assert(!sr_semaphore.trywait(), "invalid semaphore state"); |
| 2953 | |
| 2954 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { | |
| 2955 // failed to switch to WAKEUP_REQUEST | |
| 2956 ShouldNotReachHere(); | |
| 2957 return; | |
| 2958 } | |
| 2959 | |
| 2960 while (true) { | |
| 2961 if (sr_notify(osthread) == 0) { | |
| 2962 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { | |
| 2963 if (osthread->sr.is_running()) { | |
| 2964 return; | |
| 2965 } | |
| 2966 } | |
| 2967 } else { | |
| 2968 ShouldNotReachHere(); | |
| 3960 | 2969 } |
| 2970 } | |
| 10405 | 2971 |
| 2972 guarantee(osthread->sr.is_running(), "Must be running!"); | |
| 3960 | 2973 } |
| 2974 | |
| 2975 //////////////////////////////////////////////////////////////////////////////// | |
| 2976 // interrupt support | |
| 2977 | |
| 2978 void os::interrupt(Thread* thread) { | |
| 2979 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2980 "possibility of dangling Thread pointer"); | |
| 2981 | |
| 2982 OSThread* osthread = thread->osthread(); | |
| 2983 | |
| 2984 if (!osthread->interrupted()) { | |
| 2985 osthread->set_interrupted(true); | |
| 2986 // More than one thread can get here with the same value of osthread, | |
| 2987 // resulting in multiple notifications. We do, however, want the store | |
| 2988 // to interrupted() to be visible to other threads before we execute unpark(). | |
| 2989 OrderAccess::fence(); | |
| 2990 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2991 if (slp != NULL) slp->unpark() ; | |
| 2992 } | |
| 2993 | |
| 2994 // For JSR166. Unpark even if interrupt status already was set | |
| 2995 if (thread->is_Java_thread()) | |
| 2996 ((JavaThread*)thread)->parker()->unpark(); | |
| 2997 | |
| 2998 ParkEvent * ev = thread->_ParkEvent ; | |
| 2999 if (ev != NULL) ev->unpark() ; | |
| 3000 | |
| 3001 } | |
| 3002 | |
| 3003 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 3004 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 3005 "possibility of dangling Thread pointer"); | |
| 3006 | |
| 3007 OSThread* osthread = thread->osthread(); | |
| 3008 | |
| 3009 bool interrupted = osthread->interrupted(); | |
| 3010 | |
| 3011 if (interrupted && clear_interrupted) { | |
| 3012 osthread->set_interrupted(false); | |
| 3013 // consider thread->_SleepEvent->reset() ... optional optimization | |
| 3014 } | |
| 3015 | |
| 3016 return interrupted; | |
| 3017 } | |
| 3018 | |
| 3019 /////////////////////////////////////////////////////////////////////////////////// | |
| 3020 // signal handling (except suspend/resume) | |
| 3021 | |
| 3022 // This routine may be used by user applications as a "hook" to catch signals. | |
| 3023 // The user-defined signal handler must pass unrecognized signals to this | |
| 3024 // routine, and if it returns true (non-zero), then the signal handler must | |
| 3025 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
| 3026 // routine will never retun false (zero), but instead will execute a VM panic | |
| 3027 // routine kill the process. | |
| 3028 // | |
| 3029 // If this routine returns false, it is OK to call it again. This allows | |
| 3030 // the user-defined signal handler to perform checks either before or after | |
| 3031 // the VM performs its own checks. Naturally, the user code would be making | |
| 3032 // a serious error if it tried to handle an exception (such as a null check | |
| 3033 // or breakpoint) that the VM was generating for its own correct operation. | |
| 3034 // | |
| 3035 // This routine may recognize any of the following kinds of signals: | |
| 3036 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
| 3037 // It should be consulted by handlers for any of those signals. | |
| 3038 // | |
| 3039 // The caller of this routine must pass in the three arguments supplied | |
| 3040 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
| 3041 // field of the structure passed to sigaction(). This routine assumes that | |
| 3042 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
| 3043 // | |
| 3044 // Note that the VM will print warnings if it detects conflicting signal | |
| 3045 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
| 3046 // | |
| 3047 extern "C" JNIEXPORT int | |
| 3048 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
| 3049 void* ucontext, int abort_if_unrecognized); | |
| 3050 | |
| 3051 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
| 3052 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
| 8067 | 3053 int orig_errno = errno; // Preserve errno value over signal handler. |
| 3960 | 3054 JVM_handle_bsd_signal(sig, info, uc, true); |
| 8067 | 3055 errno = orig_errno; |
| 3960 | 3056 } |
| 3057 | |
| 3058 | |
| 3059 // This boolean allows users to forward their own non-matching signals | |
| 3060 // to JVM_handle_bsd_signal, harmlessly. | |
| 3061 bool os::Bsd::signal_handlers_are_installed = false; | |
| 3062 | |
| 3063 // For signal-chaining | |
| 3064 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
| 3065 unsigned int os::Bsd::sigs = 0; | |
| 3066 bool os::Bsd::libjsig_is_loaded = false; | |
| 3067 typedef struct sigaction *(*get_signal_t)(int); | |
| 3068 get_signal_t os::Bsd::get_signal_action = NULL; | |
| 3069 | |
| 3070 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
| 3071 struct sigaction *actp = NULL; | |
| 3072 | |
| 3073 if (libjsig_is_loaded) { | |
| 3074 // Retrieve the old signal handler from libjsig | |
| 3075 actp = (*get_signal_action)(sig); | |
| 3076 } | |
| 3077 if (actp == NULL) { | |
| 3078 // Retrieve the preinstalled signal handler from jvm | |
| 3079 actp = get_preinstalled_handler(sig); | |
| 3080 } | |
| 3081 | |
| 3082 return actp; | |
| 3083 } | |
| 3084 | |
| 3085 static bool call_chained_handler(struct sigaction *actp, int sig, | |
| 3086 siginfo_t *siginfo, void *context) { | |
| 3087 // Call the old signal handler | |
| 3088 if (actp->sa_handler == SIG_DFL) { | |
| 3089 // It's more reasonable to let jvm treat it as an unexpected exception | |
| 3090 // instead of taking the default action. | |
| 3091 return false; | |
| 3092 } else if (actp->sa_handler != SIG_IGN) { | |
| 3093 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
| 3094 // automaticlly block the signal | |
| 3095 sigaddset(&(actp->sa_mask), sig); | |
| 3096 } | |
| 3097 | |
| 3098 sa_handler_t hand; | |
| 3099 sa_sigaction_t sa; | |
| 3100 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
| 3101 // retrieve the chained handler | |
| 3102 if (siginfo_flag_set) { | |
| 3103 sa = actp->sa_sigaction; | |
| 3104 } else { | |
| 3105 hand = actp->sa_handler; | |
| 3106 } | |
| 3107 | |
| 3108 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
| 3109 actp->sa_handler = SIG_DFL; | |
| 3110 } | |
| 3111 | |
| 3112 // try to honor the signal mask | |
| 3113 sigset_t oset; | |
| 3114 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
| 3115 | |
| 3116 // call into the chained handler | |
| 3117 if (siginfo_flag_set) { | |
| 3118 (*sa)(sig, siginfo, context); | |
| 3119 } else { | |
| 3120 (*hand)(sig); | |
| 3121 } | |
| 3122 | |
| 3123 // restore the signal mask | |
| 3124 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
| 3125 } | |
| 3126 // Tell jvm's signal handler the signal is taken care of. | |
| 3127 return true; | |
| 3128 } | |
| 3129 | |
| 3130 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
| 3131 bool chained = false; | |
| 3132 // signal-chaining | |
| 3133 if (UseSignalChaining) { | |
| 3134 struct sigaction *actp = get_chained_signal_action(sig); | |
| 3135 if (actp != NULL) { | |
| 3136 chained = call_chained_handler(actp, sig, siginfo, context); | |
| 3137 } | |
| 3138 } | |
| 3139 return chained; | |
| 3140 } | |
| 3141 | |
| 3142 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
| 3143 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
| 3144 return &sigact[sig]; | |
| 3145 } | |
| 3146 return NULL; | |
| 3147 } | |
| 3148 | |
| 3149 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
| 3150 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3151 sigact[sig] = oldAct; | |
| 3152 sigs |= (unsigned int)1 << sig; | |
| 3153 } | |
| 3154 | |
| 3155 // for diagnostic | |
| 3156 int os::Bsd::sigflags[MAXSIGNUM]; | |
| 3157 | |
| 3158 int os::Bsd::get_our_sigflags(int sig) { | |
| 3159 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3160 return sigflags[sig]; | |
| 3161 } | |
| 3162 | |
| 3163 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
| 3164 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3165 sigflags[sig] = flags; | |
| 3166 } | |
| 3167 | |
| 3168 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
| 3169 // Check for overwrite. | |
| 3170 struct sigaction oldAct; | |
| 3171 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
| 3172 | |
| 3173 void* oldhand = oldAct.sa_sigaction | |
| 3174 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 3175 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 3176 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
| 3177 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
| 3178 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
| 3179 if (AllowUserSignalHandlers || !set_installed) { | |
| 3180 // Do not overwrite; user takes responsibility to forward to us. | |
| 3181 return; | |
| 3182 } else if (UseSignalChaining) { | |
| 3183 // save the old handler in jvm | |
| 3184 save_preinstalled_handler(sig, oldAct); | |
| 3185 // libjsig also interposes the sigaction() call below and saves the | |
| 3186 // old sigaction on it own. | |
| 3187 } else { | |
| 3188 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
| 3189 "%#lx for signal %d.", (long)oldhand, sig)); | |
| 3190 } | |
| 3191 } | |
| 3192 | |
| 3193 struct sigaction sigAct; | |
| 3194 sigfillset(&(sigAct.sa_mask)); | |
| 3195 sigAct.sa_handler = SIG_DFL; | |
| 3196 if (!set_installed) { | |
| 3197 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3198 } else { | |
| 3199 sigAct.sa_sigaction = signalHandler; | |
| 3200 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3201 } | |
|
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3202 #if __APPLE__ |
|
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3203 // Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV |
|
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3204 // (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages" |
|
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3205 // if the signal handler declares it will handle it on alternate stack. |
|
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3206 // Notice we only declare we will handle it on alt stack, but we are not |
|
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3207 // actually going to use real alt stack - this is just a workaround. |
|
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3208 // Please see ux_exception.c, method catch_mach_exception_raise for details |
|
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3209 // link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c |
|
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|
3210 if (sig == SIGSEGV) { |
|
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3211 sigAct.sa_flags |= SA_ONSTACK; |
|
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|
3212 } |
|
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3213 #endif |
|
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|
3214 |
| 3960 | 3215 // Save flags, which are set by ours |
| 3216 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3217 sigflags[sig] = sigAct.sa_flags; | |
| 3218 | |
| 3219 int ret = sigaction(sig, &sigAct, &oldAct); | |
| 3220 assert(ret == 0, "check"); | |
| 3221 | |
| 3222 void* oldhand2 = oldAct.sa_sigaction | |
| 3223 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 3224 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 3225 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
| 3226 } | |
| 3227 | |
| 3228 // install signal handlers for signals that HotSpot needs to | |
| 3229 // handle in order to support Java-level exception handling. | |
| 3230 | |
| 3231 void os::Bsd::install_signal_handlers() { | |
| 3232 if (!signal_handlers_are_installed) { | |
| 3233 signal_handlers_are_installed = true; | |
| 3234 | |
| 3235 // signal-chaining | |
| 3236 typedef void (*signal_setting_t)(); | |
| 3237 signal_setting_t begin_signal_setting = NULL; | |
| 3238 signal_setting_t end_signal_setting = NULL; | |
| 3239 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3240 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
| 3241 if (begin_signal_setting != NULL) { | |
| 3242 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3243 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
| 3244 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
| 3245 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
| 3246 libjsig_is_loaded = true; | |
| 3247 assert(UseSignalChaining, "should enable signal-chaining"); | |
| 3248 } | |
| 3249 if (libjsig_is_loaded) { | |
| 3250 // Tell libjsig jvm is setting signal handlers | |
| 3251 (*begin_signal_setting)(); | |
| 3252 } | |
| 3253 | |
| 3254 set_signal_handler(SIGSEGV, true); | |
| 3255 set_signal_handler(SIGPIPE, true); | |
| 3256 set_signal_handler(SIGBUS, true); | |
| 3257 set_signal_handler(SIGILL, true); | |
| 3258 set_signal_handler(SIGFPE, true); | |
| 3259 set_signal_handler(SIGXFSZ, true); | |
| 3260 | |
| 3261 #if defined(__APPLE__) | |
| 3262 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
| 3263 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
| 3264 // signal handler that's placed on our process by CrashReporter. This disables | |
| 3265 // CrashReporter-based reporting. | |
| 3266 // | |
| 3267 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
| 3268 // on caught fatal signals. | |
| 3269 // | |
| 3270 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
| 3271 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
| 3272 // exception handling, while leaving the standard BSD signal handlers functional. | |
| 3273 kern_return_t kr; | |
| 3274 kr = task_set_exception_ports(mach_task_self(), | |
| 3275 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
| 3276 MACH_PORT_NULL, | |
| 3277 EXCEPTION_STATE_IDENTITY, | |
| 3278 MACHINE_THREAD_STATE); | |
| 3279 | |
| 3280 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
| 3281 #endif | |
| 3282 | |
| 3283 if (libjsig_is_loaded) { | |
| 3284 // Tell libjsig jvm finishes setting signal handlers | |
| 3285 (*end_signal_setting)(); | |
| 3286 } | |
| 3287 | |
| 3288 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
| 3289 // and if UserSignalHandler is installed all bets are off | |
| 3290 if (CheckJNICalls) { | |
| 3291 if (libjsig_is_loaded) { | |
|
12096
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|
3292 if (PrintJNIResolving) { |
|
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|
3293 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); |
|
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|
3294 } |
| 3960 | 3295 check_signals = false; |
| 3296 } | |
| 3297 if (AllowUserSignalHandlers) { | |
|
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|
3298 if (PrintJNIResolving) { |
|
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|
3299 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); |
|
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|
3300 } |
| 3960 | 3301 check_signals = false; |
| 3302 } | |
| 3303 } | |
| 3304 } | |
| 3305 } | |
| 3306 | |
| 3307 | |
| 3308 ///// | |
| 3309 // glibc on Bsd platform uses non-documented flag | |
| 3310 // to indicate, that some special sort of signal | |
| 3311 // trampoline is used. | |
| 3312 // We will never set this flag, and we should | |
| 3313 // ignore this flag in our diagnostic | |
| 3314 #ifdef SIGNIFICANT_SIGNAL_MASK | |
| 3315 #undef SIGNIFICANT_SIGNAL_MASK | |
| 3316 #endif | |
| 3317 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
| 3318 | |
| 3319 static const char* get_signal_handler_name(address handler, | |
| 3320 char* buf, int buflen) { | |
| 3321 int offset; | |
| 3322 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
| 3323 if (found) { | |
| 3324 // skip directory names | |
| 3325 const char *p1, *p2; | |
| 3326 p1 = buf; | |
| 3327 size_t len = strlen(os::file_separator()); | |
| 3328 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
| 3329 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
| 3330 } else { | |
| 3331 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
| 3332 } | |
| 3333 return buf; | |
| 3334 } | |
| 3335 | |
| 3336 static void print_signal_handler(outputStream* st, int sig, | |
| 3337 char* buf, size_t buflen) { | |
| 3338 struct sigaction sa; | |
| 3339 | |
| 3340 sigaction(sig, NULL, &sa); | |
| 3341 | |
| 3342 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
| 3343 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3344 | |
| 3345 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
| 3346 | |
| 3347 address handler = (sa.sa_flags & SA_SIGINFO) | |
| 3348 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 3349 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 3350 | |
| 3351 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
| 3352 st->print("SIG_DFL"); | |
| 3353 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
| 3354 st->print("SIG_IGN"); | |
| 3355 } else { | |
| 3356 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
| 3357 } | |
| 3358 | |
| 3359 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
| 3360 | |
| 3361 address rh = VMError::get_resetted_sighandler(sig); | |
| 3362 // May be, handler was resetted by VMError? | |
| 3363 if(rh != NULL) { | |
| 3364 handler = rh; | |
| 3365 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
| 3366 } | |
| 3367 | |
| 3368 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
| 3369 | |
| 3370 // Check: is it our handler? | |
| 3371 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
| 3372 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
| 3373 // It is our signal handler | |
| 3374 // check for flags, reset system-used one! | |
| 3375 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3376 st->print( | |
| 3377 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
| 3378 os::Bsd::get_our_sigflags(sig)); | |
| 3379 } | |
| 3380 } | |
| 3381 st->cr(); | |
| 3382 } | |
| 3383 | |
| 3384 | |
| 3385 #define DO_SIGNAL_CHECK(sig) \ | |
| 3386 if (!sigismember(&check_signal_done, sig)) \ | |
| 3387 os::Bsd::check_signal_handler(sig) | |
| 3388 | |
| 3389 // This method is a periodic task to check for misbehaving JNI applications | |
| 3390 // under CheckJNI, we can add any periodic checks here | |
| 3391 | |
| 3392 void os::run_periodic_checks() { | |
| 3393 | |
| 3394 if (check_signals == false) return; | |
| 3395 | |
| 3396 // SEGV and BUS if overridden could potentially prevent | |
| 3397 // generation of hs*.log in the event of a crash, debugging | |
| 3398 // such a case can be very challenging, so we absolutely | |
| 3399 // check the following for a good measure: | |
| 3400 DO_SIGNAL_CHECK(SIGSEGV); | |
| 3401 DO_SIGNAL_CHECK(SIGILL); | |
| 3402 DO_SIGNAL_CHECK(SIGFPE); | |
| 3403 DO_SIGNAL_CHECK(SIGBUS); | |
| 3404 DO_SIGNAL_CHECK(SIGPIPE); | |
| 3405 DO_SIGNAL_CHECK(SIGXFSZ); | |
| 3406 | |
| 3407 | |
| 3408 // ReduceSignalUsage allows the user to override these handlers | |
| 3409 // see comments at the very top and jvm_solaris.h | |
| 3410 if (!ReduceSignalUsage) { | |
| 3411 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
| 3412 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
| 3413 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
| 3414 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
| 3415 } | |
| 3416 | |
| 3417 DO_SIGNAL_CHECK(SR_signum); | |
| 3418 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
| 3419 } | |
| 3420 | |
| 3421 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
| 3422 | |
| 3423 static os_sigaction_t os_sigaction = NULL; | |
| 3424 | |
| 3425 void os::Bsd::check_signal_handler(int sig) { | |
| 3426 char buf[O_BUFLEN]; | |
| 3427 address jvmHandler = NULL; | |
| 3428 | |
| 3429 | |
| 3430 struct sigaction act; | |
| 3431 if (os_sigaction == NULL) { | |
| 3432 // only trust the default sigaction, in case it has been interposed | |
| 3433 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
| 3434 if (os_sigaction == NULL) return; | |
| 3435 } | |
| 3436 | |
| 3437 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
| 3438 | |
| 3439 | |
| 3440 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3441 | |
| 3442 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
| 3443 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
| 3444 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
| 3445 | |
| 3446 | |
| 3447 switch(sig) { | |
| 3448 case SIGSEGV: | |
| 3449 case SIGBUS: | |
| 3450 case SIGFPE: | |
| 3451 case SIGPIPE: | |
| 3452 case SIGILL: | |
| 3453 case SIGXFSZ: | |
| 3454 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
| 3455 break; | |
| 3456 | |
| 3457 case SHUTDOWN1_SIGNAL: | |
| 3458 case SHUTDOWN2_SIGNAL: | |
| 3459 case SHUTDOWN3_SIGNAL: | |
| 3460 case BREAK_SIGNAL: | |
| 3461 jvmHandler = (address)user_handler(); | |
| 3462 break; | |
| 3463 | |
| 3464 case INTERRUPT_SIGNAL: | |
| 3465 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
| 3466 break; | |
| 3467 | |
| 3468 default: | |
| 3469 if (sig == SR_signum) { | |
| 3470 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
| 3471 } else { | |
| 3472 return; | |
| 3473 } | |
| 3474 break; | |
| 3475 } | |
| 3476 | |
| 3477 if (thisHandler != jvmHandler) { | |
| 3478 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
| 3479 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
| 3480 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
| 3481 // No need to check this sig any longer | |
| 3482 sigaddset(&check_signal_done, sig); | |
| 3483 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3484 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
| 3485 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
| 3486 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
| 3487 // No need to check this sig any longer | |
| 3488 sigaddset(&check_signal_done, sig); | |
| 3489 } | |
| 3490 | |
| 3491 // Dump all the signal | |
| 3492 if (sigismember(&check_signal_done, sig)) { | |
| 3493 print_signal_handlers(tty, buf, O_BUFLEN); | |
| 3494 } | |
| 3495 } | |
| 3496 | |
| 3497 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
| 3498 | |
| 3499 extern bool signal_name(int signo, char* buf, size_t len); | |
| 3500 | |
| 3501 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
| 3502 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
| 3503 // signal | |
| 3504 if (!signal_name(exception_code, buf, size)) { | |
| 3505 jio_snprintf(buf, size, "SIG%d", exception_code); | |
| 3506 } | |
| 3507 return buf; | |
| 3508 } else { | |
| 3509 return NULL; | |
| 3510 } | |
| 3511 } | |
| 3512 | |
| 3513 // this is called _before_ the most of global arguments have been parsed | |
| 3514 void os::init(void) { | |
| 3515 char dummy; /* used to get a guess on initial stack address */ | |
| 3516 // first_hrtime = gethrtime(); | |
| 3517 | |
| 3518 // With BsdThreads the JavaMain thread pid (primordial thread) | |
| 3519 // is different than the pid of the java launcher thread. | |
| 3520 // So, on Bsd, the launcher thread pid is passed to the VM | |
| 3521 // via the sun.java.launcher.pid property. | |
| 3522 // Use this property instead of getpid() if it was correctly passed. | |
| 3523 // See bug 6351349. | |
| 3524 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
| 3525 | |
| 3526 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
| 3527 | |
| 3528 clock_tics_per_sec = CLK_TCK; | |
| 3529 | |
| 3530 init_random(1234567); | |
| 3531 | |
| 3532 ThreadCritical::initialize(); | |
| 3533 | |
| 3534 Bsd::set_page_size(getpagesize()); | |
| 3535 if (Bsd::page_size() == -1) { | |
| 3536 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
| 3537 strerror(errno))); | |
| 3538 } | |
| 3539 init_page_sizes((size_t) Bsd::page_size()); | |
| 3540 | |
| 3541 Bsd::initialize_system_info(); | |
| 3542 | |
| 3543 // main_thread points to the aboriginal thread | |
| 3544 Bsd::_main_thread = pthread_self(); | |
| 3545 | |
| 3546 Bsd::clock_init(); | |
| 3547 initial_time_count = os::elapsed_counter(); | |
| 3548 | |
| 3549 #ifdef __APPLE__ | |
| 3550 // XXXDARWIN | |
| 3551 // Work around the unaligned VM callbacks in hotspot's | |
| 3552 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
| 3553 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
| 3554 // alignment when doing symbol lookup. To work around this, we force early | |
| 3555 // binding of all symbols now, thus binding when alignment is known-good. | |
| 3556 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
| 3557 #endif | |
| 3558 } | |
| 3559 | |
| 3560 // To install functions for atexit system call | |
| 3561 extern "C" { | |
| 3562 static void perfMemory_exit_helper() { | |
| 3563 perfMemory_exit(); | |
| 3564 } | |
| 3565 } | |
| 3566 | |
| 3567 // this is called _after_ the global arguments have been parsed | |
| 3568 jint os::init_2(void) | |
| 3569 { | |
| 3570 // Allocate a single page and mark it as readable for safepoint polling | |
| 3571 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 3572 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
| 3573 | |
| 3574 os::set_polling_page( polling_page ); | |
| 3575 | |
| 3576 #ifndef PRODUCT | |
| 3577 if(Verbose && PrintMiscellaneous) | |
| 3578 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 3579 #endif | |
| 3580 | |
| 3581 if (!UseMembar) { | |
| 3582 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
|
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a837fa3d3f86
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dcubed
parents:
10405
diff
changeset
|
3583 guarantee( mem_serialize_page != MAP_FAILED, "mmap Failed for memory serialize page"); |
| 3960 | 3584 os::set_memory_serialize_page( mem_serialize_page ); |
| 3585 | |
| 3586 #ifndef PRODUCT | |
| 3587 if(Verbose && PrintMiscellaneous) | |
| 3588 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 3589 #endif | |
| 3590 } | |
| 3591 | |
| 3592 // initialize suspend/resume support - must do this before signal_sets_init() | |
| 3593 if (SR_initialize() != 0) { | |
| 3594 perror("SR_initialize failed"); | |
| 3595 return JNI_ERR; | |
| 3596 } | |
| 3597 | |
| 3598 Bsd::signal_sets_init(); | |
| 3599 Bsd::install_signal_handlers(); | |
| 3600 | |
| 3601 // Check minimum allowable stack size for thread creation and to initialize | |
| 3602 // the java system classes, including StackOverflowError - depends on page | |
| 3603 // size. Add a page for compiler2 recursion in main thread. | |
| 3604 // Add in 2*BytesPerWord times page size to account for VM stack during | |
| 3605 // class initialization depending on 32 or 64 bit VM. | |
| 3606 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
| 3607 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
| 3608 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
| 3609 | |
| 3610 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
| 3611 if (threadStackSizeInBytes != 0 && | |
| 3612 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
| 3613 tty->print_cr("\nThe stack size specified is too small, " | |
| 3614 "Specify at least %dk", | |
| 3615 os::Bsd::min_stack_allowed/ K); | |
| 3616 return JNI_ERR; | |
| 3617 } | |
| 3618 | |
| 3619 // Make the stack size a multiple of the page size so that | |
| 3620 // the yellow/red zones can be guarded. | |
| 3621 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
| 3622 vm_page_size())); | |
| 3623 | |
| 3624 if (MaxFDLimit) { | |
| 3625 // set the number of file descriptors to max. print out error | |
| 3626 // if getrlimit/setrlimit fails but continue regardless. | |
| 3627 struct rlimit nbr_files; | |
| 3628 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3629 if (status != 0) { | |
| 3630 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3631 perror("os::init_2 getrlimit failed"); | |
| 3632 } else { | |
| 3633 nbr_files.rlim_cur = nbr_files.rlim_max; | |
| 3634 | |
| 3635 #ifdef __APPLE__ | |
| 3636 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
| 3637 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
| 3638 // be used instead | |
| 3639 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
| 3640 #endif | |
| 3641 | |
| 3642 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3643 if (status != 0) { | |
| 3644 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3645 perror("os::init_2 setrlimit failed"); | |
| 3646 } | |
| 3647 } | |
| 3648 } | |
| 3649 | |
| 3650 // at-exit methods are called in the reverse order of their registration. | |
| 3651 // atexit functions are called on return from main or as a result of a | |
| 3652 // call to exit(3C). There can be only 32 of these functions registered | |
| 3653 // and atexit() does not set errno. | |
| 3654 | |
| 3655 if (PerfAllowAtExitRegistration) { | |
| 3656 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 3657 // atexit functions can be delayed until process exit time, which | |
| 3658 // can be problematic for embedded VM situations. Embedded VMs should | |
| 3659 // call DestroyJavaVM() to assure that VM resources are released. | |
| 3660 | |
| 3661 // note: perfMemory_exit_helper atexit function may be removed in | |
| 3662 // the future if the appropriate cleanup code can be added to the | |
| 3663 // VM_Exit VMOperation's doit method. | |
| 3664 if (atexit(perfMemory_exit_helper) != 0) { | |
| 3665 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
| 3666 } | |
| 3667 } | |
| 3668 | |
| 3669 // initialize thread priority policy | |
| 3670 prio_init(); | |
| 3671 | |
| 4006 | 3672 #ifdef __APPLE__ |
| 3673 // dynamically link to objective c gc registration | |
| 3674 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
| 3675 if (handleLibObjc != NULL) { | |
| 3676 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
| 3677 } | |
| 3678 #endif | |
| 3679 | |
| 3960 | 3680 return JNI_OK; |
| 3681 } | |
| 3682 | |
| 3683 // this is called at the end of vm_initialization | |
| 3684 void os::init_3(void) { } | |
| 3685 | |
| 3686 // Mark the polling page as unreadable | |
| 3687 void os::make_polling_page_unreadable(void) { | |
| 3688 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
| 3689 fatal("Could not disable polling page"); | |
| 3690 }; | |
| 3691 | |
| 3692 // Mark the polling page as readable | |
| 3693 void os::make_polling_page_readable(void) { | |
| 3694 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
| 3695 fatal("Could not enable polling page"); | |
| 3696 } | |
| 3697 }; | |
| 3698 | |
| 3699 int os::active_processor_count() { | |
| 3700 return _processor_count; | |
| 3701 } | |
| 3702 | |
| 4006 | 3703 void os::set_native_thread_name(const char *name) { |
| 3704 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
| 3705 // This is only supported in Snow Leopard and beyond | |
| 3706 if (name != NULL) { | |
| 3707 // Add a "Java: " prefix to the name | |
| 3708 char buf[MAXTHREADNAMESIZE]; | |
| 3709 snprintf(buf, sizeof(buf), "Java: %s", name); | |
| 3710 pthread_setname_np(buf); | |
| 3711 } | |
| 3712 #endif | |
| 3713 } | |
| 3714 | |
| 3960 | 3715 bool os::distribute_processes(uint length, uint* distribution) { |
| 3716 // Not yet implemented. | |
| 3717 return false; | |
| 3718 } | |
| 3719 | |
| 3720 bool os::bind_to_processor(uint processor_id) { | |
| 3721 // Not yet implemented. | |
| 3722 return false; | |
| 3723 } | |
| 3724 | |
| 10405 | 3725 void os::SuspendedThreadTask::internal_do_task() { |
| 3726 if (do_suspend(_thread->osthread())) { | |
| 3727 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); | |
| 3728 do_task(context); | |
| 3729 do_resume(_thread->osthread()); | |
| 3730 } | |
| 3731 } | |
| 3732 | |
| 3960 | 3733 /// |
| 10405 | 3734 class PcFetcher : public os::SuspendedThreadTask { |
| 3735 public: | |
| 3736 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} | |
| 3737 ExtendedPC result(); | |
| 3738 protected: | |
| 3739 void do_task(const os::SuspendedThreadTaskContext& context); | |
| 3740 private: | |
| 3741 ExtendedPC _epc; | |
| 3742 }; | |
| 3743 | |
| 3744 ExtendedPC PcFetcher::result() { | |
| 3745 guarantee(is_done(), "task is not done yet."); | |
| 3746 return _epc; | |
| 3747 } | |
| 3748 | |
| 3749 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { | |
| 3750 Thread* thread = context.thread(); | |
| 3751 OSThread* osthread = thread->osthread(); | |
| 3752 if (osthread->ucontext() != NULL) { | |
| 3753 _epc = os::Bsd::ucontext_get_pc((ucontext_t *) context.ucontext()); | |
| 3754 } else { | |
| 3755 // NULL context is unexpected, double-check this is the VMThread | |
| 3756 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
| 3757 } | |
| 3758 } | |
| 3960 | 3759 |
| 3760 // Suspends the target using the signal mechanism and then grabs the PC before | |
| 3761 // resuming the target. Used by the flat-profiler only | |
| 3762 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 3763 // Make sure that it is called by the watcher for the VMThread | |
| 3764 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
| 3765 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
| 3766 | |
| 10405 | 3767 PcFetcher fetcher(thread); |
| 3768 fetcher.run(); | |
| 3769 return fetcher.result(); | |
| 3960 | 3770 } |
| 3771 | |
| 3772 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
| 3773 { | |
| 3774 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 3775 } | |
| 3776 | |
| 3777 //////////////////////////////////////////////////////////////////////////////// | |
| 3778 // debug support | |
| 3779 | |
| 3780 bool os::find(address addr, outputStream* st) { | |
| 3781 Dl_info dlinfo; | |
| 3782 memset(&dlinfo, 0, sizeof(dlinfo)); | |
|
11092
59b052799158
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parents:
10986
diff
changeset
|
3783 if (dladdr(addr, &dlinfo) != 0) { |
| 3960 | 3784 st->print(PTR_FORMAT ": ", addr); |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3785 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { |
| 3960 | 3786 st->print("%s+%#x", dlinfo.dli_sname, |
| 3787 addr - (intptr_t)dlinfo.dli_saddr); | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3788 } else if (dlinfo.dli_fbase != NULL) { |
| 3960 | 3789 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); |
| 3790 } else { | |
| 3791 st->print("<absolute address>"); | |
| 3792 } | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3793 if (dlinfo.dli_fname != NULL) { |
| 3960 | 3794 st->print(" in %s", dlinfo.dli_fname); |
| 3795 } | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3796 if (dlinfo.dli_fbase != NULL) { |
| 3960 | 3797 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); |
| 3798 } | |
| 3799 st->cr(); | |
| 3800 | |
| 3801 if (Verbose) { | |
| 3802 // decode some bytes around the PC | |
|
9060
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
3803 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); |
|
cc32ccaaf47f
8003310: Enable -Wunused-function when compiling with gcc
mikael
parents:
9059
diff
changeset
|
3804 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); |
| 3960 | 3805 address lowest = (address) dlinfo.dli_sname; |
| 3806 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
| 3807 if (begin < lowest) begin = lowest; | |
| 3808 Dl_info dlinfo2; | |
|
11092
59b052799158
8015884: runThese crashed with SIGSEGV, hs_err has an error instead of stacktrace
dcubed
parents:
10986
diff
changeset
|
3809 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr |
| 3960 | 3810 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) |
| 3811 end = (address) dlinfo2.dli_saddr; | |
| 3812 Disassembler::decode(begin, end, st); | |
| 3813 } | |
| 3814 return true; | |
| 3815 } | |
| 3816 return false; | |
| 3817 } | |
| 3818 | |
| 3819 //////////////////////////////////////////////////////////////////////////////// | |
| 3820 // misc | |
| 3821 | |
| 3822 // This does not do anything on Bsd. This is basically a hook for being | |
| 3823 // able to use structured exception handling (thread-local exception filters) | |
| 3824 // on, e.g., Win32. | |
| 3825 void | |
| 3826 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
| 3827 JavaCallArguments* args, Thread* thread) { | |
| 3828 f(value, method, args, thread); | |
| 3829 } | |
| 3830 | |
| 3831 void os::print_statistics() { | |
| 3832 } | |
| 3833 | |
| 3834 int os::message_box(const char* title, const char* message) { | |
| 3835 int i; | |
| 3836 fdStream err(defaultStream::error_fd()); | |
| 3837 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3838 err.cr(); | |
| 3839 err.print_raw_cr(title); | |
| 3840 for (i = 0; i < 78; i++) err.print_raw("-"); | |
| 3841 err.cr(); | |
| 3842 err.print_raw_cr(message); | |
| 3843 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3844 err.cr(); | |
| 3845 | |
| 3846 char buf[16]; | |
| 3847 // Prevent process from exiting upon "read error" without consuming all CPU | |
| 3848 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
| 3849 | |
| 3850 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 3851 } | |
| 3852 | |
| 3853 int os::stat(const char *path, struct stat *sbuf) { | |
| 3854 char pathbuf[MAX_PATH]; | |
| 3855 if (strlen(path) > MAX_PATH - 1) { | |
| 3856 errno = ENAMETOOLONG; | |
| 3857 return -1; | |
| 3858 } | |
| 3859 os::native_path(strcpy(pathbuf, path)); | |
| 3860 return ::stat(pathbuf, sbuf); | |
| 3861 } | |
| 3862 | |
| 3863 bool os::check_heap(bool force) { | |
| 3864 return true; | |
| 3865 } | |
| 3866 | |
| 3867 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
| 3868 return ::vsnprintf(buf, count, format, args); | |
| 3869 } | |
| 3870 | |
| 3871 // Is a (classpath) directory empty? | |
| 3872 bool os::dir_is_empty(const char* path) { | |
| 3873 DIR *dir = NULL; | |
| 3874 struct dirent *ptr; | |
| 3875 | |
| 3876 dir = opendir(path); | |
| 3877 if (dir == NULL) return true; | |
| 3878 | |
| 3879 /* Scan the directory */ | |
| 3880 bool result = true; | |
| 3881 char buf[sizeof(struct dirent) + MAX_PATH]; | |
| 3882 while (result && (ptr = ::readdir(dir)) != NULL) { | |
| 3883 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
| 3884 result = false; | |
| 3885 } | |
| 3886 } | |
| 3887 closedir(dir); | |
| 3888 return result; | |
| 3889 } | |
| 3890 | |
| 3891 // This code originates from JDK's sysOpen and open64_w | |
| 3892 // from src/solaris/hpi/src/system_md.c | |
| 3893 | |
| 3894 #ifndef O_DELETE | |
| 3895 #define O_DELETE 0x10000 | |
| 3896 #endif | |
| 3897 | |
| 3898 // Open a file. Unlink the file immediately after open returns | |
| 3899 // if the specified oflag has the O_DELETE flag set. | |
| 3900 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
| 3901 | |
| 3902 int os::open(const char *path, int oflag, int mode) { | |
| 3903 | |
| 3904 if (strlen(path) > MAX_PATH - 1) { | |
| 3905 errno = ENAMETOOLONG; | |
| 3906 return -1; | |
| 3907 } | |
| 3908 int fd; | |
| 3909 int o_delete = (oflag & O_DELETE); | |
| 3910 oflag = oflag & ~O_DELETE; | |
| 3911 | |
| 3912 fd = ::open(path, oflag, mode); | |
| 3913 if (fd == -1) return -1; | |
| 3914 | |
| 3915 //If the open succeeded, the file might still be a directory | |
| 3916 { | |
| 3917 struct stat buf; | |
| 3918 int ret = ::fstat(fd, &buf); | |
| 3919 int st_mode = buf.st_mode; | |
| 3920 | |
| 3921 if (ret != -1) { | |
| 3922 if ((st_mode & S_IFMT) == S_IFDIR) { | |
| 3923 errno = EISDIR; | |
| 3924 ::close(fd); | |
| 3925 return -1; | |
| 3926 } | |
| 3927 } else { | |
| 3928 ::close(fd); | |
| 3929 return -1; | |
| 3930 } | |
| 3931 } | |
| 3932 | |
| 3933 /* | |
| 3934 * All file descriptors that are opened in the JVM and not | |
| 3935 * specifically destined for a subprocess should have the | |
| 3936 * close-on-exec flag set. If we don't set it, then careless 3rd | |
| 3937 * party native code might fork and exec without closing all | |
| 3938 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
| 3939 * UNIXProcess.c), and this in turn might: | |
| 3940 * | |
| 3941 * - cause end-of-file to fail to be detected on some file | |
| 3942 * descriptors, resulting in mysterious hangs, or | |
| 3943 * | |
| 3944 * - might cause an fopen in the subprocess to fail on a system | |
| 3945 * suffering from bug 1085341. | |
| 3946 * | |
| 3947 * (Yes, the default setting of the close-on-exec flag is a Unix | |
| 3948 * design flaw) | |
| 3949 * | |
| 3950 * See: | |
| 3951 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
| 3952 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
| 3953 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
| 3954 */ | |
| 3955 #ifdef FD_CLOEXEC | |
| 3956 { | |
| 3957 int flags = ::fcntl(fd, F_GETFD); | |
| 3958 if (flags != -1) | |
| 3959 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
| 3960 } | |
| 3961 #endif | |
| 3962 | |
| 3963 if (o_delete != 0) { | |
| 3964 ::unlink(path); | |
| 3965 } | |
| 3966 return fd; | |
| 3967 } | |
| 3968 | |
| 3969 | |
| 3970 // create binary file, rewriting existing file if required | |
| 3971 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 3972 int oflags = O_WRONLY | O_CREAT; | |
| 3973 if (!rewrite_existing) { | |
| 3974 oflags |= O_EXCL; | |
| 3975 } | |
| 3976 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
| 3977 } | |
| 3978 | |
| 3979 // return current position of file pointer | |
| 3980 jlong os::current_file_offset(int fd) { | |
| 3981 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
| 3982 } | |
| 3983 | |
| 3984 // move file pointer to the specified offset | |
| 3985 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 3986 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
| 3987 } | |
| 3988 | |
| 3989 // This code originates from JDK's sysAvailable | |
| 3990 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
| 3991 | |
| 3992 int os::available(int fd, jlong *bytes) { | |
| 3993 jlong cur, end; | |
| 3994 int mode; | |
| 3995 struct stat buf; | |
| 3996 | |
| 3997 if (::fstat(fd, &buf) >= 0) { | |
| 3998 mode = buf.st_mode; | |
| 3999 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
| 4000 /* | |
| 4001 * XXX: is the following call interruptible? If so, this might | |
| 4002 * need to go through the INTERRUPT_IO() wrapper as for other | |
| 4003 * blocking, interruptible calls in this file. | |
| 4004 */ | |
| 4005 int n; | |
| 4006 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
| 4007 *bytes = n; | |
| 4008 return 1; | |
| 4009 } | |
| 4010 } | |
| 4011 } | |
| 4012 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
| 4013 return 0; | |
| 4014 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
| 4015 return 0; | |
| 4016 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
| 4017 return 0; | |
| 4018 } | |
| 4019 *bytes = end - cur; | |
| 4020 return 1; | |
| 4021 } | |
| 4022 | |
| 4023 int os::socket_available(int fd, jint *pbytes) { | |
| 4024 if (fd < 0) | |
| 4025 return OS_OK; | |
| 4026 | |
| 4027 int ret; | |
| 4028 | |
| 4029 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
| 4030 | |
| 4031 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
| 4032 // is expected to return 0 on failure and 1 on success to the jdk. | |
| 4033 | |
| 4034 return (ret == OS_ERR) ? 0 : 1; | |
| 4035 } | |
| 4036 | |
| 4037 // Map a block of memory. | |
| 6197 | 4038 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 4039 char *addr, size_t bytes, bool read_only, |
| 4040 bool allow_exec) { | |
| 4041 int prot; | |
| 4042 int flags; | |
| 4043 | |
| 4044 if (read_only) { | |
| 4045 prot = PROT_READ; | |
| 4046 flags = MAP_SHARED; | |
| 4047 } else { | |
| 4048 prot = PROT_READ | PROT_WRITE; | |
| 4049 flags = MAP_PRIVATE; | |
| 4050 } | |
| 4051 | |
| 4052 if (allow_exec) { | |
| 4053 prot |= PROT_EXEC; | |
| 4054 } | |
| 4055 | |
| 4056 if (addr != NULL) { | |
| 4057 flags |= MAP_FIXED; | |
| 4058 } | |
| 4059 | |
| 4060 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
| 4061 fd, file_offset); | |
| 4062 if (mapped_address == MAP_FAILED) { | |
| 4063 return NULL; | |
| 4064 } | |
| 4065 return mapped_address; | |
| 4066 } | |
| 4067 | |
| 4068 | |
| 4069 // Remap a block of memory. | |
| 6197 | 4070 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 4071 char *addr, size_t bytes, bool read_only, |
| 4072 bool allow_exec) { | |
| 4073 // same as map_memory() on this OS | |
| 4074 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 4075 allow_exec); | |
| 4076 } | |
| 4077 | |
| 4078 | |
| 4079 // Unmap a block of memory. | |
| 6197 | 4080 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| 3960 | 4081 return munmap(addr, bytes) == 0; |
| 4082 } | |
| 4083 | |
| 4084 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 4085 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 4086 // of a thread. | |
| 4087 // | |
| 4088 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 4089 // the fast estimate available on the platform. | |
| 4090 | |
| 4091 jlong os::current_thread_cpu_time() { | |
| 4092 #ifdef __APPLE__ | |
| 4093 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
|
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4094 #else |
|
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4095 Unimplemented(); |
|
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|
4096 return 0; |
| 3960 | 4097 #endif |
| 4098 } | |
| 4099 | |
| 4100 jlong os::thread_cpu_time(Thread* thread) { | |
|
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4101 #ifdef __APPLE__ |
|
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4102 return os::thread_cpu_time(thread, true /* user + sys */); |
|
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4103 #else |
|
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4104 Unimplemented(); |
|
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4105 return 0; |
|
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|
4106 #endif |
| 3960 | 4107 } |
| 4108 | |
| 4109 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 4110 #ifdef __APPLE__ | |
| 4111 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
|
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4112 #else |
|
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4113 Unimplemented(); |
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4114 return 0; |
| 3960 | 4115 #endif |
| 4116 } | |
| 4117 | |
| 4118 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 4119 #ifdef __APPLE__ | |
| 4120 struct thread_basic_info tinfo; | |
| 4121 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
| 4122 kern_return_t kr; | |
|
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4123 thread_t mach_thread; |
|
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4124 |
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4125 mach_thread = thread->osthread()->thread_id(); |
| 3960 | 4126 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
| 4127 if (kr != KERN_SUCCESS) | |
| 4128 return -1; | |
| 4129 | |
| 4130 if (user_sys_cpu_time) { | |
| 4131 jlong nanos; | |
| 4132 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
| 4133 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
| 4134 return nanos; | |
| 4135 } else { | |
| 4136 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
| 4137 } | |
|
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4138 #else |
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4139 Unimplemented(); |
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4140 return 0; |
| 3960 | 4141 #endif |
| 4142 } | |
| 4143 | |
| 4144 | |
| 4145 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 4146 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 4147 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 4148 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 4149 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 4150 } | |
| 4151 | |
| 4152 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 4153 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 4154 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 4155 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 4156 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 4157 } | |
| 4158 | |
| 4159 bool os::is_thread_cpu_time_supported() { | |
| 4160 #ifdef __APPLE__ | |
| 4161 return true; | |
| 6918 | 4162 #else |
| 3960 | 4163 return false; |
| 4164 #endif | |
| 4165 } | |
| 4166 | |
| 4167 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 4168 // Bsd doesn't yet have a (official) notion of processor sets, | |
| 4169 // so just return the system wide load average. | |
| 4170 int os::loadavg(double loadavg[], int nelem) { | |
| 4171 return ::getloadavg(loadavg, nelem); | |
| 4172 } | |
| 4173 | |
| 4174 void os::pause() { | |
| 4175 char filename[MAX_PATH]; | |
| 4176 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 4177 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 4178 } else { | |
| 4179 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 4180 } | |
| 4181 | |
| 4182 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 4183 if (fd != -1) { | |
| 4184 struct stat buf; | |
| 4185 ::close(fd); | |
| 4186 while (::stat(filename, &buf) == 0) { | |
| 4187 (void)::poll(NULL, 0, 100); | |
| 4188 } | |
| 4189 } else { | |
| 4190 jio_fprintf(stderr, | |
| 4191 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 4192 } | |
| 4193 } | |
| 4194 | |
| 4195 | |
| 4196 // Refer to the comments in os_solaris.cpp park-unpark. | |
| 4197 // | |
| 4198 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
| 4199 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
| 4200 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
| 4201 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
| 4202 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
| 4203 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
| 4204 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
| 4205 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
| 4206 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
| 4207 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
| 4208 // of libpthread avoids the problem, but isn't practical. | |
| 4209 // | |
| 4210 // Possible remedies: | |
| 4211 // | |
| 4212 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
| 4213 // This is palliative and probabilistic, however. If the thread is preempted | |
| 4214 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
| 4215 // than the minimum period may have passed, and the abstime may be stale (in the | |
| 4216 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
| 4217 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
| 4218 // | |
| 4219 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
| 4220 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
| 4221 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
| 4222 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
| 4223 // thread. | |
| 4224 // | |
| 4225 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
| 4226 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
| 4227 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
| 4228 // This also works well. In fact it avoids kernel-level scalability impediments | |
| 4229 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
| 4230 // timers in a graceful fashion. | |
| 4231 // | |
| 4232 // 4. When the abstime value is in the past it appears that control returns | |
| 4233 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
| 4234 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
| 4235 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
| 4236 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
| 4237 // It may be possible to avoid reinitialization by checking the return | |
| 4238 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
| 4239 // condvar we must establish the invariant that cond_signal() is only called | |
| 4240 // within critical sections protected by the adjunct mutex. This prevents | |
| 4241 // cond_signal() from "seeing" a condvar that's in the midst of being | |
| 4242 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
| 4243 // desirable signal-after-unlock optimization that avoids futile context switching. | |
| 4244 // | |
| 4245 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
| 4246 // structure when a condvar is used or initialized. cond_destroy() would | |
| 4247 // release the helper structure. Our reinitialize-after-timedwait fix | |
| 4248 // put excessive stress on malloc/free and locks protecting the c-heap. | |
| 4249 // | |
| 4250 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
| 4251 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
| 4252 // and only enabling the work-around for vulnerable environments. | |
| 4253 | |
| 4254 // utility to compute the abstime argument to timedwait: | |
| 4255 // millis is the relative timeout time | |
| 4256 // abstime will be the absolute timeout time | |
| 4257 // TODO: replace compute_abstime() with unpackTime() | |
| 4258 | |
| 4259 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
| 4260 if (millis < 0) millis = 0; | |
| 4261 struct timeval now; | |
| 4262 int status = gettimeofday(&now, NULL); | |
| 4263 assert(status == 0, "gettimeofday"); | |
| 4264 jlong seconds = millis / 1000; | |
| 4265 millis %= 1000; | |
| 4266 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
| 4267 seconds = 50000000; | |
| 4268 } | |
| 4269 abstime->tv_sec = now.tv_sec + seconds; | |
| 4270 long usec = now.tv_usec + millis * 1000; | |
| 4271 if (usec >= 1000000) { | |
| 4272 abstime->tv_sec += 1; | |
| 4273 usec -= 1000000; | |
| 4274 } | |
| 4275 abstime->tv_nsec = usec * 1000; | |
| 4276 return abstime; | |
| 4277 } | |
| 4278 | |
| 4279 | |
| 4280 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
| 4281 // Conceptually TryPark() should be equivalent to park(0). | |
| 4282 | |
| 4283 int os::PlatformEvent::TryPark() { | |
| 4284 for (;;) { | |
| 4285 const int v = _Event ; | |
| 4286 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 4287 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
| 4288 } | |
| 4289 } | |
| 4290 | |
| 4291 void os::PlatformEvent::park() { // AKA "down()" | |
| 4292 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 4293 // may call park(). | |
| 4294 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
| 4295 int v ; | |
| 4296 for (;;) { | |
| 4297 v = _Event ; | |
| 4298 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4299 } | |
| 4300 guarantee (v >= 0, "invariant") ; | |
| 4301 if (v == 0) { | |
| 4302 // Do this the hard way by blocking ... | |
| 4303 int status = pthread_mutex_lock(_mutex); | |
| 4304 assert_status(status == 0, status, "mutex_lock"); | |
| 4305 guarantee (_nParked == 0, "invariant") ; | |
| 4306 ++ _nParked ; | |
| 4307 while (_Event < 0) { | |
| 4308 status = pthread_cond_wait(_cond, _mutex); | |
| 4309 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
| 4310 // Treat this the same as if the wait was interrupted | |
| 4311 if (status == ETIMEDOUT) { status = EINTR; } | |
| 4312 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
| 4313 } | |
| 4314 -- _nParked ; | |
| 4315 | |
| 4316 _Event = 0 ; | |
| 4317 status = pthread_mutex_unlock(_mutex); | |
| 4318 assert_status(status == 0, status, "mutex_unlock"); | |
|
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4319 // Paranoia to ensure our locked and lock-free paths interact |
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4320 // correctly with each other. |
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|
4321 OrderAccess::fence(); |
| 3960 | 4322 } |
| 4323 guarantee (_Event >= 0, "invariant") ; | |
| 4324 } | |
| 4325 | |
| 4326 int os::PlatformEvent::park(jlong millis) { | |
| 4327 guarantee (_nParked == 0, "invariant") ; | |
| 4328 | |
| 4329 int v ; | |
| 4330 for (;;) { | |
| 4331 v = _Event ; | |
| 4332 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4333 } | |
| 4334 guarantee (v >= 0, "invariant") ; | |
| 4335 if (v != 0) return OS_OK ; | |
| 4336 | |
| 4337 // We do this the hard way, by blocking the thread. | |
| 4338 // Consider enforcing a minimum timeout value. | |
| 4339 struct timespec abst; | |
| 4340 compute_abstime(&abst, millis); | |
| 4341 | |
| 4342 int ret = OS_TIMEOUT; | |
| 4343 int status = pthread_mutex_lock(_mutex); | |
| 4344 assert_status(status == 0, status, "mutex_lock"); | |
| 4345 guarantee (_nParked == 0, "invariant") ; | |
| 4346 ++_nParked ; | |
| 4347 | |
| 4348 // Object.wait(timo) will return because of | |
| 4349 // (a) notification | |
| 4350 // (b) timeout | |
| 4351 // (c) thread.interrupt | |
| 4352 // | |
| 4353 // Thread.interrupt and object.notify{All} both call Event::set. | |
| 4354 // That is, we treat thread.interrupt as a special case of notification. | |
| 4355 // The underlying Solaris implementation, cond_timedwait, admits | |
| 4356 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
| 4357 // JVM from making those visible to Java code. As such, we must | |
| 4358 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
| 4359 // | |
| 4360 // TODO: properly differentiate simultaneous notify+interrupt. | |
| 4361 // In that case, we should propagate the notify to another waiter. | |
| 4362 | |
| 4363 while (_Event < 0) { | |
| 4364 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
| 4365 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4366 pthread_cond_destroy (_cond); | |
| 4367 pthread_cond_init (_cond, NULL) ; | |
| 4368 } | |
| 4369 assert_status(status == 0 || status == EINTR || | |
| 4370 status == ETIMEDOUT, | |
| 4371 status, "cond_timedwait"); | |
| 4372 if (!FilterSpuriousWakeups) break ; // previous semantics | |
| 4373 if (status == ETIMEDOUT) break ; | |
| 4374 // We consume and ignore EINTR and spurious wakeups. | |
| 4375 } | |
| 4376 --_nParked ; | |
| 4377 if (_Event >= 0) { | |
| 4378 ret = OS_OK; | |
| 4379 } | |
| 4380 _Event = 0 ; | |
| 4381 status = pthread_mutex_unlock(_mutex); | |
| 4382 assert_status(status == 0, status, "mutex_unlock"); | |
| 4383 assert (_nParked == 0, "invariant") ; | |
|
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4384 // Paranoia to ensure our locked and lock-free paths interact |
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4385 // correctly with each other. |
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4386 OrderAccess::fence(); |
| 3960 | 4387 return ret; |
| 4388 } | |
| 4389 | |
| 4390 void os::PlatformEvent::unpark() { | |
|
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4391 // Transitions for _Event: |
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4392 // 0 :=> 1 |
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4393 // 1 :=> 1 |
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4394 // -1 :=> either 0 or 1; must signal target thread |
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4395 // That is, we can safely transition _Event from -1 to either |
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4396 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4397 // unpark() calls. |
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4398 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4399 // |
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4400 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4401 // that it will take two back-to-back park() calls for the owning |
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4402 // thread to block. This has the benefit of forcing a spurious return |
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4403 // from the first park() call after an unpark() call which will help |
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4404 // shake out uses of park() and unpark() without condition variables. |
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4405 |
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|
4406 if (Atomic::xchg(1, &_Event) >= 0) return; |
|
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|
4407 |
|
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|
4408 // Wait for the thread associated with the event to vacate |
|
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diff
changeset
|
4409 int status = pthread_mutex_lock(_mutex); |
|
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changeset
|
4410 assert_status(status == 0, status, "mutex_lock"); |
|
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diff
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|
4411 int AnyWaiters = _nParked; |
|
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diff
changeset
|
4412 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
|
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diff
changeset
|
4413 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
|
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diff
changeset
|
4414 AnyWaiters = 0; |
|
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diff
changeset
|
4415 pthread_cond_signal(_cond); |
| 3960 | 4416 } |
|
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|
4417 status = pthread_mutex_unlock(_mutex); |
|
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diff
changeset
|
4418 assert_status(status == 0, status, "mutex_unlock"); |
|
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diff
changeset
|
4419 if (AnyWaiters != 0) { |
|
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diff
changeset
|
4420 status = pthread_cond_signal(_cond); |
|
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diff
changeset
|
4421 assert_status(status == 0, status, "cond_signal"); |
| 3960 | 4422 } |
| 4423 | |
| 4424 // Note that we signal() _after dropping the lock for "immortal" Events. | |
| 4425 // This is safe and avoids a common class of futile wakeups. In rare | |
| 4426 // circumstances this can cause a thread to return prematurely from | |
| 4427 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
| 4428 // simply re-test the condition and re-park itself. | |
| 4429 } | |
| 4430 | |
| 4431 | |
| 4432 // JSR166 | |
| 4433 // ------------------------------------------------------- | |
| 4434 | |
| 4435 /* | |
| 4436 * The solaris and bsd implementations of park/unpark are fairly | |
| 4437 * conservative for now, but can be improved. They currently use a | |
| 4438 * mutex/condvar pair, plus a a count. | |
| 4439 * Park decrements count if > 0, else does a condvar wait. Unpark | |
| 4440 * sets count to 1 and signals condvar. Only one thread ever waits | |
| 4441 * on the condvar. Contention seen when trying to park implies that someone | |
| 4442 * is unparking you, so don't wait. And spurious returns are fine, so there | |
| 4443 * is no need to track notifications. | |
| 4444 */ | |
| 4445 | |
| 4446 #define MAX_SECS 100000000 | |
| 4447 /* | |
| 4448 * This code is common to bsd and solaris and will be moved to a | |
| 4449 * common place in dolphin. | |
| 4450 * | |
| 4451 * The passed in time value is either a relative time in nanoseconds | |
| 4452 * or an absolute time in milliseconds. Either way it has to be unpacked | |
| 4453 * into suitable seconds and nanoseconds components and stored in the | |
| 4454 * given timespec structure. | |
| 4455 * Given time is a 64-bit value and the time_t used in the timespec is only | |
| 4456 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
| 4457 * overflow if times way in the future are given. Further on Solaris versions | |
| 4458 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
| 4459 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
| 4460 * As it will be 28 years before "now + 100000000" will overflow we can | |
| 4461 * ignore overflow and just impose a hard-limit on seconds using the value | |
| 4462 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
| 4463 * years from "now". | |
| 4464 */ | |
| 4465 | |
| 4466 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
| 4467 assert (time > 0, "convertTime"); | |
| 4468 | |
| 4469 struct timeval now; | |
| 4470 int status = gettimeofday(&now, NULL); | |
| 4471 assert(status == 0, "gettimeofday"); | |
| 4472 | |
| 4473 time_t max_secs = now.tv_sec + MAX_SECS; | |
| 4474 | |
| 4475 if (isAbsolute) { | |
| 4476 jlong secs = time / 1000; | |
| 4477 if (secs > max_secs) { | |
| 4478 absTime->tv_sec = max_secs; | |
| 4479 } | |
| 4480 else { | |
| 4481 absTime->tv_sec = secs; | |
| 4482 } | |
| 4483 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
| 4484 } | |
| 4485 else { | |
| 4486 jlong secs = time / NANOSECS_PER_SEC; | |
| 4487 if (secs >= MAX_SECS) { | |
| 4488 absTime->tv_sec = max_secs; | |
| 4489 absTime->tv_nsec = 0; | |
| 4490 } | |
| 4491 else { | |
| 4492 absTime->tv_sec = now.tv_sec + secs; | |
| 4493 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
| 4494 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
| 4495 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
| 4496 ++absTime->tv_sec; // note: this must be <= max_secs | |
| 4497 } | |
| 4498 } | |
| 4499 } | |
| 4500 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
| 4501 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
| 4502 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
| 4503 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
| 4504 } | |
| 4505 | |
| 4506 void Parker::park(bool isAbsolute, jlong time) { | |
|
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diff
changeset
|
4507 // Ideally we'd do something useful while spinning, such |
|
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
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diff
changeset
|
4508 // as calling unpackTime(). |
|
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8004902: correctness fixes motivated by contended locking work (6607129)
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diff
changeset
|
4509 |
| 3960 | 4510 // Optional fast-path check: |
| 4511 // Return immediately if a permit is available. | |
|
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|
4512 // We depend on Atomic::xchg() having full barrier semantics |
|
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diff
changeset
|
4513 // since we are doing a lock-free update to _counter. |
|
22ba8c8ce6a6
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parents:
7626
diff
changeset
|
4514 if (Atomic::xchg(0, &_counter) > 0) return; |
| 3960 | 4515 |
| 4516 Thread* thread = Thread::current(); | |
| 4517 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 4518 JavaThread *jt = (JavaThread *)thread; | |
| 4519 | |
| 4520 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
| 4521 // Check interrupt before trying to wait | |
| 4522 if (Thread::is_interrupted(thread, false)) { | |
| 4523 return; | |
| 4524 } | |
| 4525 | |
| 4526 // Next, demultiplex/decode time arguments | |
| 4527 struct timespec absTime; | |
| 4528 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
| 4529 return; | |
| 4530 } | |
| 4531 if (time > 0) { | |
| 4532 unpackTime(&absTime, isAbsolute, time); | |
| 4533 } | |
| 4534 | |
| 4535 | |
| 4536 // Enter safepoint region | |
| 4537 // Beware of deadlocks such as 6317397. | |
| 4538 // The per-thread Parker:: mutex is a classic leaf-lock. | |
| 4539 // In particular a thread must never block on the Threads_lock while | |
| 4540 // holding the Parker:: mutex. If safepoints are pending both the | |
| 4541 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
| 4542 ThreadBlockInVM tbivm(jt); | |
| 4543 | |
| 4544 // Don't wait if cannot get lock since interference arises from | |
| 4545 // unblocking. Also. check interrupt before trying wait | |
| 4546 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
| 4547 return; | |
| 4548 } | |
| 4549 | |
| 4550 int status ; | |
| 4551 if (_counter > 0) { // no wait needed | |
| 4552 _counter = 0; | |
| 4553 status = pthread_mutex_unlock(_mutex); | |
| 4554 assert (status == 0, "invariant") ; | |
|
7629
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7626
diff
changeset
|
4555 // Paranoia to ensure our locked and lock-free paths interact |
|
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7626
diff
changeset
|
4556 // correctly with each other and Java-level accesses. |
| 3960 | 4557 OrderAccess::fence(); |
| 4558 return; | |
| 4559 } | |
| 4560 | |
| 4561 #ifdef ASSERT | |
| 4562 // Don't catch signals while blocked; let the running threads have the signals. | |
| 4563 // (This allows a debugger to break into the running thread.) | |
| 4564 sigset_t oldsigs; | |
| 4565 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
| 4566 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
| 4567 #endif | |
| 4568 | |
| 4569 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 4570 jt->set_suspend_equivalent(); | |
| 4571 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 4572 | |
| 4573 if (time == 0) { | |
| 4574 status = pthread_cond_wait (_cond, _mutex) ; | |
| 4575 } else { | |
| 4576 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
| 4577 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4578 pthread_cond_destroy (_cond) ; | |
| 4579 pthread_cond_init (_cond, NULL); | |
| 4580 } | |
| 4581 } | |
| 4582 assert_status(status == 0 || status == EINTR || | |
| 4583 status == ETIMEDOUT, | |
| 4584 status, "cond_timedwait"); | |
| 4585 | |
| 4586 #ifdef ASSERT | |
| 4587 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
| 4588 #endif | |
| 4589 | |
| 4590 _counter = 0 ; | |
| 4591 status = pthread_mutex_unlock(_mutex) ; | |
| 4592 assert_status(status == 0, status, "invariant") ; | |
|
7629
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
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7626
diff
changeset
|
4593 // Paranoia to ensure our locked and lock-free paths interact |
|
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
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parents:
7626
diff
changeset
|
4594 // correctly with each other and Java-level accesses. |
|
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7626
diff
changeset
|
4595 OrderAccess::fence(); |
|
22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
dcubed
parents:
7626
diff
changeset
|
4596 |
| 3960 | 4597 // If externally suspended while waiting, re-suspend |
| 4598 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 4599 jt->java_suspend_self(); | |
| 4600 } | |
| 4601 } | |
| 4602 | |
| 4603 void Parker::unpark() { | |
| 4604 int s, status ; | |
| 4605 status = pthread_mutex_lock(_mutex); | |
| 4606 assert (status == 0, "invariant") ; | |
| 4607 s = _counter; | |
| 4608 _counter = 1; | |
| 4609 if (s < 1) { | |
| 4610 if (WorkAroundNPTLTimedWaitHang) { | |
| 4611 status = pthread_cond_signal (_cond) ; | |
| 4612 assert (status == 0, "invariant") ; | |
| 4613 status = pthread_mutex_unlock(_mutex); | |
| 4614 assert (status == 0, "invariant") ; | |
| 4615 } else { | |
| 4616 status = pthread_mutex_unlock(_mutex); | |
| 4617 assert (status == 0, "invariant") ; | |
| 4618 status = pthread_cond_signal (_cond) ; | |
| 4619 assert (status == 0, "invariant") ; | |
| 4620 } | |
| 4621 } else { | |
| 4622 pthread_mutex_unlock(_mutex); | |
| 4623 assert (status == 0, "invariant") ; | |
| 4624 } | |
| 4625 } | |
| 4626 | |
| 4627 | |
| 4628 /* Darwin has no "environ" in a dynamic library. */ | |
| 4629 #ifdef __APPLE__ | |
| 4630 #include <crt_externs.h> | |
| 4631 #define environ (*_NSGetEnviron()) | |
| 4632 #else | |
| 4633 extern char** environ; | |
| 4634 #endif | |
| 4635 | |
| 4636 // Run the specified command in a separate process. Return its exit value, | |
| 4637 // or -1 on failure (e.g. can't fork a new process). | |
| 4638 // Unlike system(), this function can be called from signal handler. It | |
| 4639 // doesn't block SIGINT et al. | |
| 4640 int os::fork_and_exec(char* cmd) { | |
| 4641 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
| 4642 | |
| 4643 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
| 4644 // pthread_atfork handlers and reset pthread library. All we need is a | |
| 4645 // separate process to execve. Make a direct syscall to fork process. | |
| 4646 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
| 4647 // the best... | |
| 4648 pid_t pid = fork(); | |
| 4649 | |
| 4650 if (pid < 0) { | |
| 4651 // fork failed | |
| 4652 return -1; | |
| 4653 | |
| 4654 } else if (pid == 0) { | |
| 4655 // child process | |
| 4656 | |
| 4657 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
| 4658 // first to kill every thread on the thread list. Because this list is | |
| 4659 // not reset by fork() (see notes above), execve() will instead kill | |
| 4660 // every thread in the parent process. We know this is the only thread | |
| 4661 // in the new process, so make a system call directly. | |
| 4662 // IA64 should use normal execve() from glibc to match the glibc fork() | |
| 4663 // above. | |
| 4664 execve("/bin/sh", (char* const*)argv, environ); | |
| 4665 | |
| 4666 // execve failed | |
| 4667 _exit(-1); | |
| 4668 | |
| 4669 } else { | |
| 4670 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
| 4671 // care about the actual exit code, for now. | |
| 4672 | |
| 4673 int status; | |
| 4674 | |
| 4675 // Wait for the child process to exit. This returns immediately if | |
| 4676 // the child has already exited. */ | |
| 4677 while (waitpid(pid, &status, 0) < 0) { | |
| 4678 switch (errno) { | |
| 4679 case ECHILD: return 0; | |
| 4680 case EINTR: break; | |
| 4681 default: return -1; | |
| 4682 } | |
| 4683 } | |
| 4684 | |
| 4685 if (WIFEXITED(status)) { | |
| 4686 // The child exited normally; get its exit code. | |
| 4687 return WEXITSTATUS(status); | |
| 4688 } else if (WIFSIGNALED(status)) { | |
| 4689 // The child exited because of a signal | |
| 4690 // The best value to return is 0x80 + signal number, | |
| 4691 // because that is what all Unix shells do, and because | |
| 4692 // it allows callers to distinguish between process exit and | |
| 4693 // process death by signal. | |
| 4694 return 0x80 + WTERMSIG(status); | |
| 4695 } else { | |
| 4696 // Unknown exit code; pass it through | |
| 4697 return status; | |
| 4698 } | |
| 4699 } | |
| 4700 } | |
| 4701 | |
| 4702 // is_headless_jre() | |
| 4703 // | |
|
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
4704 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
| 3960 | 4705 // in order to report if we are running in a headless jre |
| 4706 // | |
|
4082
36b057451829
7110017: is_headless_jre should be updated to reflect the new location of awt toolkit libraries
dholmes
parents:
4006
diff
changeset
|
4707 // Since JDK8 xawt/libmawt.so was moved into the same directory |
|
36b057451829
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dholmes
parents:
4006
diff
changeset
|
4708 // as libawt.so, and renamed libawt_xawt.so |
|
36b057451829
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dholmes
parents:
4006
diff
changeset
|
4709 // |
| 3960 | 4710 bool os::is_headless_jre() { |
| 4711 struct stat statbuf; | |
| 4712 char buf[MAXPATHLEN]; | |
| 4713 char libmawtpath[MAXPATHLEN]; | |
| 4006 | 4714 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
| 5921 | 4715 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
| 3960 | 4716 char *p; |
| 4717 | |
| 4718 // Get path to libjvm.so | |
| 4719 os::jvm_path(buf, sizeof(buf)); | |
| 4720 | |
| 4721 // Get rid of libjvm.so | |
| 4722 p = strrchr(buf, '/'); | |
| 4723 if (p == NULL) return false; | |
| 4724 else *p = '\0'; | |
| 4725 | |
| 4726 // Get rid of client or server | |
| 4727 p = strrchr(buf, '/'); | |
| 4728 if (p == NULL) return false; | |
| 4729 else *p = '\0'; | |
| 4730 | |
| 4731 // check xawt/libmawt.so | |
| 4732 strcpy(libmawtpath, buf); | |
| 4733 strcat(libmawtpath, xawtstr); | |
| 4734 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
| 4735 | |
|
4082
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4006
diff
changeset
|
4736 // check libawt_xawt.so |
| 3960 | 4737 strcpy(libmawtpath, buf); |
|
4082
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4006
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changeset
|
4738 strcat(libmawtpath, new_xawtstr); |
| 3960 | 4739 if (::stat(libmawtpath, &statbuf) == 0) return false; |
| 4740 | |
| 4741 return true; | |
| 4742 } | |
|
6200
65906dc96aa1
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6197
diff
changeset
|
4743 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
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6197
diff
changeset
|
4744 // Get the default path to the core file |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
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6197
diff
changeset
|
4745 // Returns the length of the string |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
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parents:
6197
diff
changeset
|
4746 int os::get_core_path(char* buffer, size_t bufferSize) { |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4747 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
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6197
diff
changeset
|
4748 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
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6197
diff
changeset
|
4749 // Truncate if theoretical string was longer than bufferSize |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4750 n = MIN2(n, (int)bufferSize); |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
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6197
diff
changeset
|
4751 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
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6197
diff
changeset
|
4752 return n; |
|
65906dc96aa1
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6197
diff
changeset
|
4753 } |
| 10405 | 4754 |
|
12110
4c84d351cca9
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stefank
parents:
12096
diff
changeset
|
4755 #ifndef PRODUCT |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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12096
diff
changeset
|
4756 void TestReserveMemorySpecial_test() { |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
12096
diff
changeset
|
4757 // No tests available for this platform |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
parents:
12096
diff
changeset
|
4758 } |
|
4c84d351cca9
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
stefank
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4759 #endif |