Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 7456:7d42f3b08300
8005044: remove crufty '_g' support from HS runtime code
Summary: Phase 2 is removing '_g' support from the Runtime code.
Reviewed-by: dcubed, coleenp, hseigel
Contributed-by: ron.durbin@oracle.com
| author | dcubed |
|---|---|
| date | Wed, 19 Dec 2012 10:35:08 -0800 |
| parents | d2f8c38e543d |
| children | 989155e2d07a c07c102cbad7 |
| rev | line source |
|---|---|
| 3960 | 1 /* |
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2 * Copyright (c) 1999, 2012, 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" | |
| 60 #include "services/runtimeService.hpp" | |
| 61 #include "utilities/decoder.hpp" | |
| 62 #include "utilities/defaultStream.hpp" | |
| 63 #include "utilities/events.hpp" | |
| 64 #include "utilities/growableArray.hpp" | |
| 65 #include "utilities/vmError.hpp" | |
| 66 | |
| 67 // put OS-includes here | |
| 68 # include <sys/types.h> | |
| 69 # include <sys/mman.h> | |
| 70 # include <sys/stat.h> | |
| 71 # include <sys/select.h> | |
| 72 # include <pthread.h> | |
| 73 # include <signal.h> | |
| 74 # include <errno.h> | |
| 75 # include <dlfcn.h> | |
| 76 # include <stdio.h> | |
| 77 # include <unistd.h> | |
| 78 # include <sys/resource.h> | |
| 79 # include <pthread.h> | |
| 80 # include <sys/stat.h> | |
| 81 # include <sys/time.h> | |
| 82 # include <sys/times.h> | |
| 83 # include <sys/utsname.h> | |
| 84 # include <sys/socket.h> | |
| 85 # include <sys/wait.h> | |
| 86 # include <time.h> | |
| 87 # include <pwd.h> | |
| 88 # include <poll.h> | |
| 89 # include <semaphore.h> | |
| 90 # include <fcntl.h> | |
| 91 # include <string.h> | |
| 92 # include <sys/param.h> | |
| 93 # include <sys/sysctl.h> | |
| 94 # include <sys/ipc.h> | |
| 95 # include <sys/shm.h> | |
| 96 #ifndef __APPLE__ | |
| 97 # include <link.h> | |
| 98 #endif | |
| 99 # include <stdint.h> | |
| 100 # include <inttypes.h> | |
| 101 # include <sys/ioctl.h> | |
| 102 | |
| 103 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
| 104 # include <elf.h> | |
| 105 #endif | |
| 106 | |
| 107 #ifdef __APPLE__ | |
| 4006 | 108 # include <mach/mach.h> // semaphore_* API |
| 109 # include <mach-o/dyld.h> | |
| 110 # include <sys/proc_info.h> | |
| 111 # include <objc/objc-auto.h> | |
| 3960 | 112 #endif |
| 113 | |
| 114 #ifndef MAP_ANONYMOUS | |
| 115 #define MAP_ANONYMOUS MAP_ANON | |
| 116 #endif | |
| 117 | |
| 118 #define MAX_PATH (2 * K) | |
| 119 | |
| 120 // for timer info max values which include all bits | |
| 121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
| 122 | |
| 123 #define LARGEPAGES_BIT (1 << 6) | |
| 124 //////////////////////////////////////////////////////////////////////////////// | |
| 125 // global variables | |
| 126 julong os::Bsd::_physical_memory = 0; | |
| 127 | |
| 128 | |
| 129 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
| 130 pthread_t os::Bsd::_main_thread; | |
| 131 int os::Bsd::_page_size = -1; | |
| 132 | |
| 133 static jlong initial_time_count=0; | |
| 134 | |
| 135 static int clock_tics_per_sec = 100; | |
| 136 | |
| 137 // For diagnostics to print a message once. see run_periodic_checks | |
| 138 static sigset_t check_signal_done; | |
| 6918 | 139 static bool check_signals = true; |
| 3960 | 140 |
| 141 static pid_t _initial_pid = 0; | |
| 142 | |
| 143 /* Signal number used to suspend/resume a thread */ | |
| 144 | |
| 145 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
| 146 static int SR_signum = SIGUSR2; | |
| 147 sigset_t SR_sigset; | |
| 148 | |
| 149 | |
| 150 //////////////////////////////////////////////////////////////////////////////// | |
| 151 // utility functions | |
| 152 | |
| 153 static int SR_initialize(); | |
| 154 static int SR_finalize(); | |
| 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 julong os::allocatable_physical_memory(julong size) { | |
| 170 #ifdef _LP64 | |
| 171 return size; | |
| 172 #else | |
| 173 julong result = MIN2(size, (julong)3800*M); | |
| 174 if (!is_allocatable(result)) { | |
| 175 // See comments under solaris for alignment considerations | |
| 176 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); | |
| 177 result = MIN2(size, reasonable_size); | |
| 178 } | |
| 179 return result; | |
| 180 #endif // _LP64 | |
| 181 } | |
| 182 | |
| 183 //////////////////////////////////////////////////////////////////////////////// | |
| 184 // environment support | |
| 185 | |
| 186 bool os::getenv(const char* name, char* buf, int len) { | |
| 187 const char* val = ::getenv(name); | |
| 188 if (val != NULL && strlen(val) < (size_t)len) { | |
| 189 strcpy(buf, val); | |
| 190 return true; | |
| 191 } | |
| 192 if (len > 0) buf[0] = 0; // return a null string | |
| 193 return false; | |
| 194 } | |
| 195 | |
| 196 | |
| 197 // Return true if user is running as root. | |
| 198 | |
| 199 bool os::have_special_privileges() { | |
| 200 static bool init = false; | |
| 201 static bool privileges = false; | |
| 202 if (!init) { | |
| 203 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
| 204 init = true; | |
| 205 } | |
| 206 return privileges; | |
| 207 } | |
| 208 | |
| 209 | |
| 210 | |
| 211 // Cpu architecture string | |
| 212 #if defined(ZERO) | |
| 213 static char cpu_arch[] = ZERO_LIBARCH; | |
| 214 #elif defined(IA64) | |
| 215 static char cpu_arch[] = "ia64"; | |
| 216 #elif defined(IA32) | |
| 217 static char cpu_arch[] = "i386"; | |
| 218 #elif defined(AMD64) | |
| 219 static char cpu_arch[] = "amd64"; | |
| 220 #elif defined(ARM) | |
| 221 static char cpu_arch[] = "arm"; | |
| 222 #elif defined(PPC) | |
| 223 static char cpu_arch[] = "ppc"; | |
| 224 #elif defined(SPARC) | |
| 225 # ifdef _LP64 | |
| 226 static char cpu_arch[] = "sparcv9"; | |
| 227 # else | |
| 228 static char cpu_arch[] = "sparc"; | |
| 229 # endif | |
| 230 #else | |
| 231 #error Add appropriate cpu_arch setting | |
| 232 #endif | |
| 233 | |
| 4846 | 234 // Compiler variant |
| 235 #ifdef COMPILER2 | |
| 236 #define COMPILER_VARIANT "server" | |
| 237 #else | |
| 238 #define COMPILER_VARIANT "client" | |
| 239 #endif | |
| 3960 | 240 |
| 6918 | 241 |
| 3960 | 242 void os::Bsd::initialize_system_info() { |
| 243 int mib[2]; | |
| 244 size_t len; | |
| 245 int cpu_val; | |
| 246 u_long mem_val; | |
| 247 | |
| 248 /* get processors count via hw.ncpus sysctl */ | |
| 249 mib[0] = CTL_HW; | |
| 250 mib[1] = HW_NCPU; | |
| 251 len = sizeof(cpu_val); | |
| 252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
| 253 set_processor_count(cpu_val); | |
| 254 } | |
| 255 else { | |
| 256 set_processor_count(1); // fallback | |
| 257 } | |
| 258 | |
| 259 /* get physical memory via hw.usermem sysctl (hw.usermem is used | |
| 260 * instead of hw.physmem because we need size of allocatable memory | |
| 261 */ | |
| 262 mib[0] = CTL_HW; | |
| 263 mib[1] = HW_USERMEM; | |
| 264 len = sizeof(mem_val); | |
| 265 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) | |
| 266 _physical_memory = mem_val; | |
| 267 else | |
| 268 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) | |
| 269 | |
| 270 #ifdef __OpenBSD__ | |
| 271 { | |
| 272 // limit _physical_memory memory view on OpenBSD since | |
| 273 // datasize rlimit restricts us anyway. | |
| 274 struct rlimit limits; | |
| 275 getrlimit(RLIMIT_DATA, &limits); | |
| 276 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
| 277 } | |
| 278 #endif | |
| 279 } | |
| 280 | |
| 4006 | 281 #ifdef __APPLE__ |
| 282 static const char *get_home() { | |
| 283 const char *home_dir = ::getenv("HOME"); | |
| 284 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
| 285 struct passwd *passwd_info = getpwuid(geteuid()); | |
| 286 if (passwd_info != NULL) { | |
| 287 home_dir = passwd_info->pw_dir; | |
| 288 } | |
| 289 } | |
| 290 | |
| 291 return home_dir; | |
| 292 } | |
| 293 #endif | |
| 294 | |
| 3960 | 295 void os::init_system_properties_values() { |
| 296 // char arch[12]; | |
| 297 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
| 298 | |
| 299 // The next steps are taken in the product version: | |
| 300 // | |
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301 // Obtain the JAVA_HOME value from the location of libjvm.so. |
| 3960 | 302 // This library should be located at: |
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303 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
| 3960 | 304 // |
| 305 // If "/jre/lib/" appears at the right place in the path, then we | |
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306 // assume libjvm.so is installed in a JDK and we use this path. |
| 3960 | 307 // |
| 308 // Otherwise exit with message: "Could not create the Java virtual machine." | |
| 309 // | |
| 310 // The following extra steps are taken in the debugging version: | |
| 311 // | |
| 312 // If "/jre/lib/" does NOT appear at the right place in the path | |
| 313 // instead of exit check for $JAVA_HOME environment variable. | |
| 314 // | |
| 315 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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316 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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317 // it looks like libjvm.so is installed there |
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318 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
| 3960 | 319 // |
| 320 // Otherwise exit. | |
| 321 // | |
| 322 // Important note: if the location of libjvm.so changes this | |
| 323 // code needs to be changed accordingly. | |
| 324 | |
| 325 // The next few definitions allow the code to be verbatim: | |
| 6197 | 326 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
| 3960 | 327 #define getenv(n) ::getenv(n) |
| 328 | |
| 329 /* | |
| 330 * See ld(1): | |
| 331 * The linker uses the following search paths to locate required | |
| 332 * shared libraries: | |
| 333 * 1: ... | |
| 334 * ... | |
| 335 * 7: The default directories, normally /lib and /usr/lib. | |
| 336 */ | |
| 337 #ifndef DEFAULT_LIBPATH | |
| 338 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
| 339 #endif | |
| 340 | |
| 341 #define EXTENSIONS_DIR "/lib/ext" | |
| 342 #define ENDORSED_DIR "/lib/endorsed" | |
| 343 #define REG_DIR "/usr/java/packages" | |
| 344 | |
| 4006 | 345 #ifdef __APPLE__ |
| 346 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
| 347 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
| 348 const char *user_home_dir = get_home(); | |
| 349 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
| 350 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
| 351 sizeof(SYS_EXTENSIONS_DIRS); | |
| 352 #endif | |
| 353 | |
| 3960 | 354 { |
| 355 /* sysclasspath, java_home, dll_dir */ | |
| 356 { | |
| 357 char *home_path; | |
| 358 char *dll_path; | |
| 359 char *pslash; | |
| 360 char buf[MAXPATHLEN]; | |
| 361 os::jvm_path(buf, sizeof(buf)); | |
| 362 | |
| 363 // Found the full path to libjvm.so. | |
| 364 // Now cut the path to <java_home>/jre if we can. | |
| 365 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
| 366 pslash = strrchr(buf, '/'); | |
| 367 if (pslash != NULL) | |
| 368 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
| 369 dll_path = malloc(strlen(buf) + 1); | |
| 370 if (dll_path == NULL) | |
| 371 return; | |
| 372 strcpy(dll_path, buf); | |
| 373 Arguments::set_dll_dir(dll_path); | |
| 374 | |
| 375 if (pslash != NULL) { | |
| 376 pslash = strrchr(buf, '/'); | |
| 377 if (pslash != NULL) { | |
| 4006 | 378 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
| 379 #ifndef __APPLE__ | |
| 3960 | 380 pslash = strrchr(buf, '/'); |
| 381 if (pslash != NULL) | |
| 382 *pslash = '\0'; /* get rid of /lib */ | |
| 4006 | 383 #endif |
| 3960 | 384 } |
| 385 } | |
| 386 | |
| 387 home_path = malloc(strlen(buf) + 1); | |
| 388 if (home_path == NULL) | |
| 389 return; | |
| 390 strcpy(home_path, buf); | |
| 391 Arguments::set_java_home(home_path); | |
| 392 | |
| 393 if (!set_boot_path('/', ':')) | |
| 394 return; | |
| 395 } | |
| 396 | |
| 397 /* | |
| 398 * Where to look for native libraries | |
| 399 * | |
| 400 * Note: Due to a legacy implementation, most of the library path | |
| 401 * is set in the launcher. This was to accomodate linking restrictions | |
| 402 * on legacy Bsd implementations (which are no longer supported). | |
| 403 * Eventually, all the library path setting will be done here. | |
| 404 * | |
| 405 * However, to prevent the proliferation of improperly built native | |
| 406 * libraries, the new path component /usr/java/packages is added here. | |
| 407 * Eventually, all the library path setting will be done here. | |
| 408 */ | |
| 409 { | |
| 410 char *ld_library_path; | |
| 411 | |
| 412 /* | |
| 413 * Construct the invariant part of ld_library_path. Note that the | |
| 414 * space for the colon and the trailing null are provided by the | |
| 415 * nulls included by the sizeof operator (so actually we allocate | |
| 416 * a byte more than necessary). | |
| 417 */ | |
| 4006 | 418 #ifdef __APPLE__ |
| 419 ld_library_path = (char *) malloc(system_ext_size); | |
| 420 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
| 421 #else | |
| 3960 | 422 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
| 423 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
| 424 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
| 4006 | 425 #endif |
| 3960 | 426 |
| 427 /* | |
| 428 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
| 429 * should always exist (until the legacy problem cited above is | |
| 430 * addressed). | |
| 431 */ | |
| 432 #ifdef __APPLE__ | |
| 4006 | 433 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
| 434 char *l = getenv("JAVA_LIBRARY_PATH"); | |
| 435 if (l != NULL) { | |
| 436 char *t = ld_library_path; | |
| 437 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 438 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
| 439 sprintf(ld_library_path, "%s:%s", l, t); | |
| 440 free(t); | |
| 441 } | |
| 442 | |
| 3960 | 443 char *v = getenv("DYLD_LIBRARY_PATH"); |
| 444 #else | |
| 445 char *v = getenv("LD_LIBRARY_PATH"); | |
| 446 #endif | |
| 447 if (v != NULL) { | |
| 448 char *t = ld_library_path; | |
| 449 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 450 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
| 451 sprintf(ld_library_path, "%s:%s", v, t); | |
| 4006 | 452 free(t); |
| 3960 | 453 } |
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454 |
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455 #ifdef __APPLE__ |
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456 // Apple's Java6 has "." at the beginning of java.library.path. |
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457 // OpenJDK on Windows has "." at the end of java.library.path. |
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458 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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459 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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460 // "." is appended to the end of java.library.path. Yes, this |
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461 // could cause a change in behavior, but Apple's Java6 behavior |
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462 // can be achieved by putting "." at the beginning of the |
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463 // JAVA_LIBRARY_PATH environment variable. |
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464 { |
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465 char *t = ld_library_path; |
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466 // that's +3 for appending ":." and the trailing '\0' |
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467 ld_library_path = (char *) malloc(strlen(t) + 3); |
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468 sprintf(ld_library_path, "%s:%s", t, "."); |
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469 free(t); |
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470 } |
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471 #endif |
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472 |
| 3960 | 473 Arguments::set_library_path(ld_library_path); |
| 474 } | |
| 475 | |
| 476 /* | |
| 477 * Extensions directories. | |
| 478 * | |
| 479 * Note that the space for the colon and the trailing null are provided | |
| 480 * by the nulls included by the sizeof operator (so actually one byte more | |
| 481 * than necessary is allocated). | |
| 482 */ | |
| 483 { | |
| 4006 | 484 #ifdef __APPLE__ |
| 485 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
| 486 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
| 487 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
| 488 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
| 489 #else | |
| 3960 | 490 char *buf = malloc(strlen(Arguments::get_java_home()) + |
| 491 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
| 492 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
| 493 Arguments::get_java_home()); | |
| 4006 | 494 #endif |
| 495 | |
| 3960 | 496 Arguments::set_ext_dirs(buf); |
| 497 } | |
| 498 | |
| 499 /* Endorsed standards default directory. */ | |
| 500 { | |
| 501 char * buf; | |
| 502 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
| 503 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
| 504 Arguments::set_endorsed_dirs(buf); | |
| 505 } | |
| 506 } | |
| 507 | |
| 4006 | 508 #ifdef __APPLE__ |
| 509 #undef SYS_EXTENSIONS_DIR | |
| 510 #endif | |
| 3960 | 511 #undef malloc |
| 512 #undef getenv | |
| 513 #undef EXTENSIONS_DIR | |
| 514 #undef ENDORSED_DIR | |
| 515 | |
| 516 // Done | |
| 517 return; | |
| 518 } | |
| 519 | |
| 520 //////////////////////////////////////////////////////////////////////////////// | |
| 521 // breakpoint support | |
| 522 | |
| 523 void os::breakpoint() { | |
| 524 BREAKPOINT; | |
| 525 } | |
| 526 | |
| 527 extern "C" void breakpoint() { | |
| 528 // use debugger to set breakpoint here | |
| 529 } | |
| 530 | |
| 531 //////////////////////////////////////////////////////////////////////////////// | |
| 532 // signal support | |
| 533 | |
| 534 debug_only(static bool signal_sets_initialized = false); | |
| 535 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
| 536 | |
| 537 bool os::Bsd::is_sig_ignored(int sig) { | |
| 538 struct sigaction oact; | |
| 539 sigaction(sig, (struct sigaction*)NULL, &oact); | |
| 540 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
| 541 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
| 542 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
| 543 return true; | |
| 544 else | |
| 545 return false; | |
| 546 } | |
| 547 | |
| 548 void os::Bsd::signal_sets_init() { | |
| 549 // Should also have an assertion stating we are still single-threaded. | |
| 550 assert(!signal_sets_initialized, "Already initialized"); | |
| 551 // Fill in signals that are necessarily unblocked for all threads in | |
| 552 // the VM. Currently, we unblock the following signals: | |
| 553 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
| 554 // by -Xrs (=ReduceSignalUsage)); | |
| 555 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
| 556 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
| 557 // the dispositions or masks wrt these signals. | |
| 558 // Programs embedding the VM that want to use the above signals for their | |
| 559 // own purposes must, at this time, use the "-Xrs" option to prevent | |
| 560 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
| 561 // (See bug 4345157, and other related bugs). | |
| 562 // In reality, though, unblocking these signals is really a nop, since | |
| 563 // these signals are not blocked by default. | |
| 564 sigemptyset(&unblocked_sigs); | |
| 565 sigemptyset(&allowdebug_blocked_sigs); | |
| 566 sigaddset(&unblocked_sigs, SIGILL); | |
| 567 sigaddset(&unblocked_sigs, SIGSEGV); | |
| 568 sigaddset(&unblocked_sigs, SIGBUS); | |
| 569 sigaddset(&unblocked_sigs, SIGFPE); | |
| 570 sigaddset(&unblocked_sigs, SR_signum); | |
| 571 | |
| 572 if (!ReduceSignalUsage) { | |
| 573 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
| 574 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
| 575 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
| 576 } | |
| 577 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
| 578 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
| 579 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
| 580 } | |
| 581 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
| 582 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
| 583 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
| 584 } | |
| 585 } | |
| 586 // Fill in signals that are blocked by all but the VM thread. | |
| 587 sigemptyset(&vm_sigs); | |
| 588 if (!ReduceSignalUsage) | |
| 589 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
| 590 debug_only(signal_sets_initialized = true); | |
| 591 | |
| 592 } | |
| 593 | |
| 594 // These are signals that are unblocked while a thread is running Java. | |
| 595 // (For some reason, they get blocked by default.) | |
| 596 sigset_t* os::Bsd::unblocked_signals() { | |
| 597 assert(signal_sets_initialized, "Not initialized"); | |
| 598 return &unblocked_sigs; | |
| 599 } | |
| 600 | |
| 601 // These are the signals that are blocked while a (non-VM) thread is | |
| 602 // running Java. Only the VM thread handles these signals. | |
| 603 sigset_t* os::Bsd::vm_signals() { | |
| 604 assert(signal_sets_initialized, "Not initialized"); | |
| 605 return &vm_sigs; | |
| 606 } | |
| 607 | |
| 608 // These are signals that are blocked during cond_wait to allow debugger in | |
| 609 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
| 610 assert(signal_sets_initialized, "Not initialized"); | |
| 611 return &allowdebug_blocked_sigs; | |
| 612 } | |
| 613 | |
| 614 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
| 615 | |
| 616 //Save caller's signal mask before setting VM signal mask | |
| 617 sigset_t caller_sigmask; | |
| 618 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
| 619 | |
| 620 OSThread* osthread = thread->osthread(); | |
| 621 osthread->set_caller_sigmask(caller_sigmask); | |
| 622 | |
| 623 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
| 624 | |
| 625 if (!ReduceSignalUsage) { | |
| 626 if (thread->is_VM_thread()) { | |
| 627 // Only the VM thread handles BREAK_SIGNAL ... | |
| 628 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
| 629 } else { | |
| 630 // ... all other threads block BREAK_SIGNAL | |
| 631 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
| 632 } | |
| 633 } | |
| 634 } | |
| 635 | |
| 636 | |
| 637 ////////////////////////////////////////////////////////////////////////////// | |
| 638 // create new thread | |
| 639 | |
| 640 static address highest_vm_reserved_address(); | |
| 641 | |
| 642 // check if it's safe to start a new thread | |
| 643 static bool _thread_safety_check(Thread* thread) { | |
| 6918 | 644 return true; |
| 3960 | 645 } |
| 646 | |
| 4006 | 647 #ifdef __APPLE__ |
| 648 // library handle for calling objc_registerThreadWithCollector() | |
| 649 // without static linking to the libobjc library | |
| 650 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
| 651 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
| 652 typedef void (*objc_registerThreadWithCollector_t)(); | |
| 653 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
| 654 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
| 655 #endif | |
| 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__ |
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683 // thread_id is mach thread on macos |
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684 osthread->set_thread_id(::mach_thread_self()); |
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685 #else |
| 3960 | 686 // thread_id is pthread_id on BSD |
| 687 osthread->set_thread_id(::pthread_self()); | |
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688 #endif |
| 3960 | 689 // initialize signal mask for this thread |
| 690 os::Bsd::hotspot_sigmask(thread); | |
| 691 | |
| 692 // initialize floating point control register | |
| 693 os::Bsd::init_thread_fpu_state(); | |
| 694 | |
| 4006 | 695 #ifdef __APPLE__ |
| 696 // register thread with objc gc | |
| 697 if (objc_registerThreadWithCollectorFunction != NULL) { | |
| 698 objc_registerThreadWithCollectorFunction(); | |
| 699 } | |
| 700 #endif | |
| 701 | |
| 3960 | 702 // handshaking with parent thread |
| 703 { | |
| 704 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 705 | |
| 706 // notify parent thread | |
| 707 osthread->set_state(INITIALIZED); | |
| 708 sync->notify_all(); | |
| 709 | |
| 710 // wait until os::start_thread() | |
| 711 while (osthread->get_state() == INITIALIZED) { | |
| 712 sync->wait(Mutex::_no_safepoint_check_flag); | |
| 713 } | |
| 714 } | |
| 715 | |
| 716 // call one more level start routine | |
| 717 thread->run(); | |
| 718 | |
| 719 return 0; | |
| 720 } | |
| 721 | |
| 722 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 723 assert(thread->osthread() == NULL, "caller responsible"); | |
| 724 | |
| 725 // Allocate the OSThread object | |
| 726 OSThread* osthread = new OSThread(NULL, NULL); | |
| 727 if (osthread == NULL) { | |
| 728 return false; | |
| 729 } | |
| 730 | |
| 731 // set the correct thread state | |
| 732 osthread->set_thread_type(thr_type); | |
| 733 | |
| 734 // Initial state is ALLOCATED but not INITIALIZED | |
| 735 osthread->set_state(ALLOCATED); | |
| 736 | |
| 737 thread->set_osthread(osthread); | |
| 738 | |
| 739 // init thread attributes | |
| 740 pthread_attr_t attr; | |
| 741 pthread_attr_init(&attr); | |
| 742 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
| 743 | |
| 744 // stack size | |
| 745 if (os::Bsd::supports_variable_stack_size()) { | |
| 746 // calculate stack size if it's not specified by caller | |
| 747 if (stack_size == 0) { | |
| 748 stack_size = os::Bsd::default_stack_size(thr_type); | |
| 749 | |
| 750 switch (thr_type) { | |
| 751 case os::java_thread: | |
| 752 // Java threads use ThreadStackSize which default value can be | |
| 753 // changed with the flag -Xss | |
| 754 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
| 755 stack_size = JavaThread::stack_size_at_create(); | |
| 756 break; | |
| 757 case os::compiler_thread: | |
| 758 if (CompilerThreadStackSize > 0) { | |
| 759 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 760 break; | |
| 761 } // else fall through: | |
| 762 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 763 case os::vm_thread: | |
| 764 case os::pgc_thread: | |
| 765 case os::cgc_thread: | |
| 766 case os::watcher_thread: | |
| 767 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 768 break; | |
| 769 } | |
| 770 } | |
| 771 | |
| 772 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
| 773 pthread_attr_setstacksize(&attr, stack_size); | |
| 774 } else { | |
| 775 // let pthread_create() pick the default value. | |
| 776 } | |
| 777 | |
| 778 ThreadState state; | |
| 779 | |
| 780 { | |
| 781 pthread_t tid; | |
| 782 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
| 783 | |
| 784 pthread_attr_destroy(&attr); | |
| 785 | |
| 786 if (ret != 0) { | |
| 787 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 788 perror("pthread_create()"); | |
| 789 } | |
| 790 // Need to clean up stuff we've allocated so far | |
| 791 thread->set_osthread(NULL); | |
| 792 delete osthread; | |
| 793 return false; | |
| 794 } | |
| 795 | |
| 796 // Store pthread info into the OSThread | |
| 797 osthread->set_pthread_id(tid); | |
| 798 | |
| 799 // Wait until child thread is either initialized or aborted | |
| 800 { | |
| 801 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 802 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 803 while ((state = osthread->get_state()) == ALLOCATED) { | |
| 804 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
| 805 } | |
| 806 } | |
| 807 | |
| 808 } | |
| 809 | |
| 810 // Aborted due to thread limit being reached | |
| 811 if (state == ZOMBIE) { | |
| 812 thread->set_osthread(NULL); | |
| 813 delete osthread; | |
| 814 return false; | |
| 815 } | |
| 816 | |
| 817 // The thread is returned suspended (in state INITIALIZED), | |
| 818 // and is started higher up in the call chain | |
| 819 assert(state == INITIALIZED, "race condition"); | |
| 820 return true; | |
| 821 } | |
| 822 | |
| 823 ///////////////////////////////////////////////////////////////////////////// | |
| 824 // attach existing thread | |
| 825 | |
| 826 // bootstrap the main thread | |
| 827 bool os::create_main_thread(JavaThread* thread) { | |
| 828 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
| 829 return create_attached_thread(thread); | |
| 830 } | |
| 831 | |
| 832 bool os::create_attached_thread(JavaThread* thread) { | |
| 833 #ifdef ASSERT | |
| 834 thread->verify_not_published(); | |
| 835 #endif | |
| 836 | |
| 837 // Allocate the OSThread object | |
| 838 OSThread* osthread = new OSThread(NULL, NULL); | |
| 839 | |
| 840 if (osthread == NULL) { | |
| 841 return false; | |
| 842 } | |
| 843 | |
| 844 // Store pthread info into the OSThread | |
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845 #ifdef __APPLE__ |
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846 osthread->set_thread_id(::mach_thread_self()); |
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847 #else |
| 3960 | 848 osthread->set_thread_id(::pthread_self()); |
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849 #endif |
| 3960 | 850 osthread->set_pthread_id(::pthread_self()); |
| 851 | |
| 852 // initialize floating point control register | |
| 853 os::Bsd::init_thread_fpu_state(); | |
| 854 | |
| 855 // Initial thread state is RUNNABLE | |
| 856 osthread->set_state(RUNNABLE); | |
| 857 | |
| 858 thread->set_osthread(osthread); | |
| 859 | |
| 860 // initialize signal mask for this thread | |
| 861 // and save the caller's signal mask | |
| 862 os::Bsd::hotspot_sigmask(thread); | |
| 863 | |
| 864 return true; | |
| 865 } | |
| 866 | |
| 867 void os::pd_start_thread(Thread* thread) { | |
| 868 OSThread * osthread = thread->osthread(); | |
| 869 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
| 870 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 871 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 872 sync_with_child->notify(); | |
| 873 } | |
| 874 | |
| 875 // Free Bsd resources related to the OSThread | |
| 876 void os::free_thread(OSThread* osthread) { | |
| 877 assert(osthread != NULL, "osthread not set"); | |
| 878 | |
| 879 if (Thread::current()->osthread() == osthread) { | |
| 880 // Restore caller's signal mask | |
| 881 sigset_t sigmask = osthread->caller_sigmask(); | |
| 882 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
| 883 } | |
| 884 | |
| 885 delete osthread; | |
| 886 } | |
| 887 | |
| 888 ////////////////////////////////////////////////////////////////////////////// | |
| 889 // thread local storage | |
| 890 | |
| 891 int os::allocate_thread_local_storage() { | |
| 892 pthread_key_t key; | |
| 893 int rslt = pthread_key_create(&key, NULL); | |
| 894 assert(rslt == 0, "cannot allocate thread local storage"); | |
| 895 return (int)key; | |
| 896 } | |
| 897 | |
| 898 // Note: This is currently not used by VM, as we don't destroy TLS key | |
| 899 // on VM exit. | |
| 900 void os::free_thread_local_storage(int index) { | |
| 901 int rslt = pthread_key_delete((pthread_key_t)index); | |
| 902 assert(rslt == 0, "invalid index"); | |
| 903 } | |
| 904 | |
| 905 void os::thread_local_storage_at_put(int index, void* value) { | |
| 906 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
| 907 assert(rslt == 0, "pthread_setspecific failed"); | |
| 908 } | |
| 909 | |
| 910 extern "C" Thread* get_thread() { | |
| 911 return ThreadLocalStorage::thread(); | |
| 912 } | |
| 913 | |
| 914 | |
| 915 //////////////////////////////////////////////////////////////////////////////// | |
| 916 // time support | |
| 917 | |
| 918 // Time since start-up in seconds to a fine granularity. | |
| 919 // Used by VMSelfDestructTimer and the MemProfiler. | |
| 920 double os::elapsedTime() { | |
| 921 | |
| 922 return (double)(os::elapsed_counter()) * 0.000001; | |
| 923 } | |
| 924 | |
| 925 jlong os::elapsed_counter() { | |
| 926 timeval time; | |
| 927 int status = gettimeofday(&time, NULL); | |
| 928 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
| 929 } | |
| 930 | |
| 931 jlong os::elapsed_frequency() { | |
| 932 return (1000 * 1000); | |
| 933 } | |
| 934 | |
| 935 // XXX: For now, code this as if BSD does not support vtime. | |
| 936 bool os::supports_vtime() { return false; } | |
| 937 bool os::enable_vtime() { return false; } | |
| 938 bool os::vtime_enabled() { return false; } | |
| 939 double os::elapsedVTime() { | |
| 940 // better than nothing, but not much | |
| 941 return elapsedTime(); | |
| 942 } | |
| 943 | |
| 944 jlong os::javaTimeMillis() { | |
| 945 timeval time; | |
| 946 int status = gettimeofday(&time, NULL); | |
| 947 assert(status != -1, "bsd error"); | |
| 948 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
| 949 } | |
| 950 | |
| 951 #ifndef CLOCK_MONOTONIC | |
| 952 #define CLOCK_MONOTONIC (1) | |
| 953 #endif | |
| 954 | |
| 955 #ifdef __APPLE__ | |
| 956 void os::Bsd::clock_init() { | |
| 957 // XXXDARWIN: Investigate replacement monotonic clock | |
| 958 } | |
| 6918 | 959 #else |
| 3960 | 960 void os::Bsd::clock_init() { |
| 961 struct timespec res; | |
| 962 struct timespec tp; | |
| 963 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
| 964 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
| 965 // yes, monotonic clock is supported | |
| 966 _clock_gettime = ::clock_gettime; | |
| 967 } | |
| 968 } | |
| 969 #endif | |
| 970 | |
| 971 | |
| 972 jlong os::javaTimeNanos() { | |
| 973 if (Bsd::supports_monotonic_clock()) { | |
| 974 struct timespec tp; | |
| 975 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
| 976 assert(status == 0, "gettime error"); | |
| 977 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
| 978 return result; | |
| 979 } else { | |
| 980 timeval time; | |
| 981 int status = gettimeofday(&time, NULL); | |
| 982 assert(status != -1, "bsd error"); | |
| 983 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
| 984 return 1000 * usecs; | |
| 985 } | |
| 986 } | |
| 987 | |
| 988 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 989 if (Bsd::supports_monotonic_clock()) { | |
| 990 info_ptr->max_value = ALL_64_BITS; | |
| 991 | |
| 992 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
| 993 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
| 994 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
| 995 } else { | |
| 996 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
| 997 info_ptr->max_value = ALL_64_BITS; | |
| 998 | |
| 999 // gettimeofday is a real time clock so it skips | |
| 1000 info_ptr->may_skip_backward = true; | |
| 1001 info_ptr->may_skip_forward = true; | |
| 1002 } | |
| 1003 | |
| 1004 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 1005 } | |
| 1006 | |
| 1007 // Return the real, user, and system times in seconds from an | |
| 1008 // arbitrary fixed point in the past. | |
| 1009 bool os::getTimesSecs(double* process_real_time, | |
| 1010 double* process_user_time, | |
| 1011 double* process_system_time) { | |
| 1012 struct tms ticks; | |
| 1013 clock_t real_ticks = times(&ticks); | |
| 1014 | |
| 1015 if (real_ticks == (clock_t) (-1)) { | |
| 1016 return false; | |
| 1017 } else { | |
| 1018 double ticks_per_second = (double) clock_tics_per_sec; | |
| 1019 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
| 1020 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
| 1021 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
| 1022 | |
| 1023 return true; | |
| 1024 } | |
| 1025 } | |
| 1026 | |
| 1027 | |
| 1028 char * os::local_time_string(char *buf, size_t buflen) { | |
| 1029 struct tm t; | |
| 1030 time_t long_time; | |
| 1031 time(&long_time); | |
| 1032 localtime_r(&long_time, &t); | |
| 1033 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 1034 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
| 1035 t.tm_hour, t.tm_min, t.tm_sec); | |
| 1036 return buf; | |
| 1037 } | |
| 1038 | |
| 1039 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
| 1040 return localtime_r(clock, res); | |
| 1041 } | |
| 1042 | |
| 1043 //////////////////////////////////////////////////////////////////////////////// | |
| 1044 // runtime exit support | |
| 1045 | |
| 1046 // Note: os::shutdown() might be called very early during initialization, or | |
| 1047 // called from signal handler. Before adding something to os::shutdown(), make | |
| 1048 // sure it is async-safe and can handle partially initialized VM. | |
| 1049 void os::shutdown() { | |
| 1050 | |
| 1051 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 1052 perfMemory_exit(); | |
| 1053 | |
| 1054 // needs to remove object in file system | |
| 1055 AttachListener::abort(); | |
| 1056 | |
| 1057 // flush buffered output, finish log files | |
| 1058 ostream_abort(); | |
| 1059 | |
| 1060 // Check for abort hook | |
| 1061 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 1062 if (abort_hook != NULL) { | |
| 1063 abort_hook(); | |
| 1064 } | |
| 1065 | |
| 1066 } | |
| 1067 | |
| 1068 // Note: os::abort() might be called very early during initialization, or | |
| 1069 // called from signal handler. Before adding something to os::abort(), make | |
| 1070 // sure it is async-safe and can handle partially initialized VM. | |
| 1071 void os::abort(bool dump_core) { | |
| 1072 os::shutdown(); | |
| 1073 if (dump_core) { | |
| 1074 #ifndef PRODUCT | |
| 1075 fdStream out(defaultStream::output_fd()); | |
| 1076 out.print_raw("Current thread is "); | |
| 1077 char buf[16]; | |
| 1078 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
| 1079 out.print_raw_cr(buf); | |
| 1080 out.print_raw_cr("Dumping core ..."); | |
| 1081 #endif | |
| 1082 ::abort(); // dump core | |
| 1083 } | |
| 1084 | |
| 1085 ::exit(1); | |
| 1086 } | |
| 1087 | |
| 1088 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 1089 void os::die() { | |
| 1090 // _exit() on BsdThreads only kills current thread | |
| 1091 ::abort(); | |
| 1092 } | |
| 1093 | |
| 1094 // unused on bsd for now. | |
| 1095 void os::set_error_file(const char *logfile) {} | |
| 1096 | |
| 1097 | |
| 1098 // This method is a copy of JDK's sysGetLastErrorString | |
| 1099 // from src/solaris/hpi/src/system_md.c | |
| 1100 | |
| 1101 size_t os::lasterror(char *buf, size_t len) { | |
| 1102 | |
| 1103 if (errno == 0) return 0; | |
| 1104 | |
| 1105 const char *s = ::strerror(errno); | |
| 1106 size_t n = ::strlen(s); | |
| 1107 if (n >= len) { | |
| 1108 n = len - 1; | |
| 1109 } | |
| 1110 ::strncpy(buf, s, n); | |
| 1111 buf[n] = '\0'; | |
| 1112 return n; | |
| 1113 } | |
| 1114 | |
|
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1115 intx os::current_thread_id() { |
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1116 #ifdef __APPLE__ |
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1117 return (intx)::mach_thread_self(); |
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1118 #else |
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1119 return (intx)::pthread_self(); |
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1120 #endif |
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1121 } |
| 3960 | 1122 int os::current_process_id() { |
| 1123 | |
| 1124 // Under the old bsd thread library, bsd gives each thread | |
| 1125 // its own process id. Because of this each thread will return | |
| 1126 // a different pid if this method were to return the result | |
| 1127 // of getpid(2). Bsd provides no api that returns the pid | |
| 1128 // of the launcher thread for the vm. This implementation | |
| 1129 // returns a unique pid, the pid of the launcher thread | |
| 1130 // that starts the vm 'process'. | |
| 1131 | |
| 1132 // Under the NPTL, getpid() returns the same pid as the | |
| 1133 // launcher thread rather than a unique pid per thread. | |
| 1134 // Use gettid() if you want the old pre NPTL behaviour. | |
| 1135 | |
| 1136 // if you are looking for the result of a call to getpid() that | |
| 1137 // returns a unique pid for the calling thread, then look at the | |
| 1138 // OSThread::thread_id() method in osThread_bsd.hpp file | |
| 1139 | |
| 1140 return (int)(_initial_pid ? _initial_pid : getpid()); | |
| 1141 } | |
| 1142 | |
| 1143 // DLL functions | |
| 1144 | |
| 1145 #define JNI_LIB_PREFIX "lib" | |
| 1146 #ifdef __APPLE__ | |
| 1147 #define JNI_LIB_SUFFIX ".dylib" | |
| 1148 #else | |
| 1149 #define JNI_LIB_SUFFIX ".so" | |
| 1150 #endif | |
| 1151 | |
| 1152 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
| 1153 | |
| 1154 // This must be hard coded because it's the system's temporary | |
| 1155 // directory not the java application's temp directory, ala java.io.tmpdir. | |
| 4006 | 1156 #ifdef __APPLE__ |
| 1157 // macosx has a secure per-user temporary directory | |
| 1158 char temp_path_storage[PATH_MAX]; | |
| 1159 const char* os::get_temp_directory() { | |
| 1160 static char *temp_path = NULL; | |
| 1161 if (temp_path == NULL) { | |
| 1162 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
| 1163 if (pathSize == 0 || pathSize > PATH_MAX) { | |
| 1164 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
| 1165 } | |
| 1166 temp_path = temp_path_storage; | |
| 1167 } | |
| 1168 return temp_path; | |
| 1169 } | |
| 1170 #else /* __APPLE__ */ | |
| 3960 | 1171 const char* os::get_temp_directory() { return "/tmp"; } |
| 4006 | 1172 #endif /* __APPLE__ */ |
| 3960 | 1173 |
| 1174 static bool file_exists(const char* filename) { | |
| 1175 struct stat statbuf; | |
| 1176 if (filename == NULL || strlen(filename) == 0) { | |
| 1177 return false; | |
| 1178 } | |
| 1179 return os::stat(filename, &statbuf) == 0; | |
| 1180 } | |
| 1181 | |
|
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1182 bool os::dll_build_name(char* buffer, size_t buflen, |
| 3960 | 1183 const char* pname, const char* fname) { |
|
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1184 bool retval = false; |
| 3960 | 1185 // Copied from libhpi |
| 1186 const size_t pnamelen = pname ? strlen(pname) : 0; | |
| 1187 | |
|
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1188 // Return error on buffer overflow. |
| 3960 | 1189 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
|
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1190 return retval; |
| 3960 | 1191 } |
| 1192 | |
| 1193 if (pnamelen == 0) { | |
| 1194 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
|
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1195 retval = true; |
| 3960 | 1196 } else if (strchr(pname, *os::path_separator()) != NULL) { |
| 1197 int n; | |
| 1198 char** pelements = split_path(pname, &n); | |
| 1199 for (int i = 0 ; i < n ; i++) { | |
| 1200 // Really shouldn't be NULL, but check can't hurt | |
| 1201 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
| 1202 continue; // skip the empty path values | |
| 1203 } | |
| 1204 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
| 1205 pelements[i], fname); | |
| 1206 if (file_exists(buffer)) { | |
|
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1207 retval = true; |
| 3960 | 1208 break; |
| 1209 } | |
| 1210 } | |
| 1211 // release the storage | |
| 1212 for (int i = 0 ; i < n ; i++) { | |
| 1213 if (pelements[i] != NULL) { | |
| 6197 | 1214 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| 3960 | 1215 } |
| 1216 } | |
| 1217 if (pelements != NULL) { | |
| 6197 | 1218 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| 3960 | 1219 } |
| 1220 } else { | |
| 1221 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
|
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1222 retval = true; |
| 3960 | 1223 } |
|
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1224 return retval; |
| 3960 | 1225 } |
| 1226 | |
| 1227 const char* os::get_current_directory(char *buf, int buflen) { | |
| 1228 return getcwd(buf, buflen); | |
| 1229 } | |
| 1230 | |
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1231 // check if addr is inside libjvm.so |
| 3960 | 1232 bool os::address_is_in_vm(address addr) { |
| 1233 static address libjvm_base_addr; | |
| 1234 Dl_info dlinfo; | |
| 1235 | |
| 1236 if (libjvm_base_addr == NULL) { | |
| 1237 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
| 1238 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
| 1239 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
| 1240 } | |
| 1241 | |
| 1242 if (dladdr((void *)addr, &dlinfo)) { | |
| 1243 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
| 1244 } | |
| 1245 | |
| 1246 return false; | |
| 1247 } | |
| 1248 | |
| 6258 | 1249 |
| 1250 #define MACH_MAXSYMLEN 256 | |
| 1251 | |
| 3960 | 1252 bool os::dll_address_to_function_name(address addr, char *buf, |
| 1253 int buflen, int *offset) { | |
| 1254 Dl_info dlinfo; | |
| 6258 | 1255 char localbuf[MACH_MAXSYMLEN]; |
| 1256 | |
| 1257 // dladdr will find names of dynamic functions only, but does | |
| 1258 // it set dli_fbase with mach_header address when it "fails" ? | |
| 3960 | 1259 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { |
| 1260 if (buf != NULL) { | |
| 1261 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { | |
| 1262 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); | |
| 1263 } | |
| 1264 } | |
| 1265 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; | |
| 1266 return true; | |
| 1267 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { | |
| 1268 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), | |
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1269 buf, buflen, offset, dlinfo.dli_fname)) { |
| 3960 | 1270 return true; |
| 1271 } | |
| 1272 } | |
| 1273 | |
| 6258 | 1274 // Handle non-dymanic manually: |
| 1275 if (dlinfo.dli_fbase != NULL && | |
| 1276 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { | |
| 1277 if(!Decoder::demangle(localbuf, buf, buflen)) { | |
| 1278 jio_snprintf(buf, buflen, "%s", localbuf); | |
| 1279 } | |
| 1280 return true; | |
| 1281 } | |
| 3960 | 1282 if (buf != NULL) buf[0] = '\0'; |
| 1283 if (offset != NULL) *offset = -1; | |
| 1284 return false; | |
| 1285 } | |
| 1286 | |
| 1287 // ported from solaris version | |
| 1288 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1289 int buflen, int* offset) { | |
| 1290 Dl_info dlinfo; | |
| 1291 | |
| 1292 if (dladdr((void*)addr, &dlinfo)){ | |
| 1293 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
| 1294 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
| 1295 return true; | |
| 1296 } else { | |
| 1297 if (buf) buf[0] = '\0'; | |
| 1298 if (offset) *offset = -1; | |
| 1299 return false; | |
| 1300 } | |
| 1301 } | |
| 6918 | 1302 |
| 1303 // Loads .dll/.so and | |
| 1304 // in case of error it checks if .dll/.so was built for the | |
| 1305 // same architecture as Hotspot is running on | |
| 3960 | 1306 |
| 1307 #ifdef __APPLE__ | |
| 1308 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
| 1309 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1310 if (result != NULL) { | |
| 1311 // Successful loading | |
| 1312 return result; | |
| 1313 } | |
| 1314 | |
| 1315 // Read system error message into ebuf | |
| 1316 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1317 ebuf[ebuflen-1]='\0'; | |
| 1318 | |
| 1319 return NULL; | |
| 1320 } | |
| 1321 #else | |
| 1322 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
| 1323 { | |
| 1324 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1325 if (result != NULL) { | |
| 1326 // Successful loading | |
| 1327 return result; | |
| 1328 } | |
| 1329 | |
| 1330 Elf32_Ehdr elf_head; | |
| 1331 | |
| 1332 // Read system error message into ebuf | |
| 1333 // It may or may not be overwritten below | |
| 1334 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1335 ebuf[ebuflen-1]='\0'; | |
| 1336 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
| 1337 char* diag_msg_buf=ebuf+strlen(ebuf); | |
| 1338 | |
| 1339 if (diag_msg_max_length==0) { | |
| 1340 // No more space in ebuf for additional diagnostics message | |
| 1341 return NULL; | |
| 1342 } | |
| 1343 | |
| 1344 | |
| 1345 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
| 1346 | |
| 1347 if (file_descriptor < 0) { | |
| 1348 // Can't open library, report dlerror() message | |
| 1349 return NULL; | |
| 1350 } | |
| 1351 | |
| 1352 bool failed_to_read_elf_head= | |
| 1353 (sizeof(elf_head)!= | |
| 1354 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
| 1355 | |
| 1356 ::close(file_descriptor); | |
| 1357 if (failed_to_read_elf_head) { | |
| 1358 // file i/o error - report dlerror() msg | |
| 1359 return NULL; | |
| 1360 } | |
| 1361 | |
| 1362 typedef struct { | |
| 1363 Elf32_Half code; // Actual value as defined in elf.h | |
| 1364 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
| 1365 char elf_class; // 32 or 64 bit | |
| 1366 char endianess; // MSB or LSB | |
| 1367 char* name; // String representation | |
| 1368 } arch_t; | |
| 1369 | |
| 1370 #ifndef EM_486 | |
| 1371 #define EM_486 6 /* Intel 80486 */ | |
| 1372 #endif | |
| 1373 | |
| 1374 #ifndef EM_MIPS_RS3_LE | |
| 1375 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
| 1376 #endif | |
| 1377 | |
| 1378 #ifndef EM_PPC64 | |
| 1379 #define EM_PPC64 21 /* PowerPC64 */ | |
| 1380 #endif | |
| 1381 | |
| 1382 #ifndef EM_S390 | |
| 1383 #define EM_S390 22 /* IBM System/390 */ | |
| 1384 #endif | |
| 1385 | |
| 1386 #ifndef EM_IA_64 | |
| 1387 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
| 1388 #endif | |
| 1389 | |
| 1390 #ifndef EM_X86_64 | |
| 1391 #define EM_X86_64 62 /* AMD x86-64 */ | |
| 1392 #endif | |
| 1393 | |
| 1394 static const arch_t arch_array[]={ | |
| 1395 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1396 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1397 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
| 1398 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
| 1399 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1400 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1401 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
| 1402 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
| 1403 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
| 1404 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
| 1405 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
| 1406 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
| 1407 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
| 1408 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
| 1409 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
| 1410 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
| 1411 }; | |
| 1412 | |
| 1413 #if (defined IA32) | |
| 1414 static Elf32_Half running_arch_code=EM_386; | |
| 1415 #elif (defined AMD64) | |
| 1416 static Elf32_Half running_arch_code=EM_X86_64; | |
| 1417 #elif (defined IA64) | |
| 1418 static Elf32_Half running_arch_code=EM_IA_64; | |
| 1419 #elif (defined __sparc) && (defined _LP64) | |
| 1420 static Elf32_Half running_arch_code=EM_SPARCV9; | |
| 1421 #elif (defined __sparc) && (!defined _LP64) | |
| 1422 static Elf32_Half running_arch_code=EM_SPARC; | |
| 1423 #elif (defined __powerpc64__) | |
| 1424 static Elf32_Half running_arch_code=EM_PPC64; | |
| 1425 #elif (defined __powerpc__) | |
| 1426 static Elf32_Half running_arch_code=EM_PPC; | |
| 1427 #elif (defined ARM) | |
| 1428 static Elf32_Half running_arch_code=EM_ARM; | |
| 1429 #elif (defined S390) | |
| 1430 static Elf32_Half running_arch_code=EM_S390; | |
| 1431 #elif (defined ALPHA) | |
| 1432 static Elf32_Half running_arch_code=EM_ALPHA; | |
| 1433 #elif (defined MIPSEL) | |
| 1434 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
| 1435 #elif (defined PARISC) | |
| 1436 static Elf32_Half running_arch_code=EM_PARISC; | |
| 1437 #elif (defined MIPS) | |
| 1438 static Elf32_Half running_arch_code=EM_MIPS; | |
| 1439 #elif (defined M68K) | |
| 1440 static Elf32_Half running_arch_code=EM_68K; | |
| 1441 #else | |
| 1442 #error Method os::dll_load requires that one of following is defined:\ | |
| 1443 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
| 1444 #endif | |
| 1445 | |
| 1446 // Identify compatability class for VM's architecture and library's architecture | |
| 1447 // Obtain string descriptions for architectures | |
| 1448 | |
| 1449 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
| 1450 int running_arch_index=-1; | |
| 1451 | |
| 1452 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
| 1453 if (running_arch_code == arch_array[i].code) { | |
| 1454 running_arch_index = i; | |
| 1455 } | |
| 1456 if (lib_arch.code == arch_array[i].code) { | |
| 1457 lib_arch.compat_class = arch_array[i].compat_class; | |
| 1458 lib_arch.name = arch_array[i].name; | |
| 1459 } | |
| 1460 } | |
| 1461 | |
| 1462 assert(running_arch_index != -1, | |
| 1463 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
| 1464 if (running_arch_index == -1) { | |
| 1465 // Even though running architecture detection failed | |
| 1466 // we may still continue with reporting dlerror() message | |
| 1467 return NULL; | |
| 1468 } | |
| 1469 | |
| 1470 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
| 1471 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
| 1472 return NULL; | |
| 1473 } | |
| 1474 | |
| 1475 #ifndef S390 | |
| 1476 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
| 1477 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
| 1478 return NULL; | |
| 1479 } | |
| 1480 #endif // !S390 | |
| 1481 | |
| 1482 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
| 1483 if ( lib_arch.name!=NULL ) { | |
| 1484 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1485 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
| 1486 lib_arch.name, arch_array[running_arch_index].name); | |
| 1487 } else { | |
| 1488 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1489 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
| 1490 lib_arch.code, | |
| 1491 arch_array[running_arch_index].name); | |
| 1492 } | |
| 1493 } | |
| 1494 | |
| 1495 return NULL; | |
| 1496 } | |
| 1497 #endif /* !__APPLE__ */ | |
| 1498 | |
| 1499 // XXX: Do we need a lock around this as per Linux? | |
| 1500 void* os::dll_lookup(void* handle, const char* name) { | |
| 1501 return dlsym(handle, name); | |
| 1502 } | |
| 1503 | |
| 1504 | |
| 1505 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
| 1506 int fd = ::open(filename, O_RDONLY); | |
| 1507 if (fd == -1) { | |
| 1508 return false; | |
| 1509 } | |
| 1510 | |
| 1511 char buf[32]; | |
| 1512 int bytes; | |
| 1513 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
| 1514 st->print_raw(buf, bytes); | |
| 1515 } | |
| 1516 | |
| 1517 ::close(fd); | |
| 1518 | |
| 1519 return true; | |
| 1520 } | |
| 1521 | |
| 1522 void os::print_dll_info(outputStream *st) { | |
| 1523 st->print_cr("Dynamic libraries:"); | |
| 1524 #ifdef RTLD_DI_LINKMAP | |
| 1525 Dl_info dli; | |
| 1526 void *handle; | |
| 1527 Link_map *map; | |
| 1528 Link_map *p; | |
| 1529 | |
| 1530 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { | |
| 1531 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1532 return; | |
| 1533 } | |
| 1534 handle = dlopen(dli.dli_fname, RTLD_LAZY); | |
| 1535 if (handle == NULL) { | |
| 1536 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1537 return; | |
| 1538 } | |
| 1539 dlinfo(handle, RTLD_DI_LINKMAP, &map); | |
| 1540 if (map == NULL) { | |
| 1541 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1542 return; | |
| 1543 } | |
| 1544 | |
| 1545 while (map->l_prev != NULL) | |
| 1546 map = map->l_prev; | |
| 1547 | |
| 1548 while (map != NULL) { | |
| 1549 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); | |
| 1550 map = map->l_next; | |
| 1551 } | |
| 1552 | |
| 1553 dlclose(handle); | |
| 1554 #elif defined(__APPLE__) | |
| 1555 uint32_t count; | |
| 1556 uint32_t i; | |
| 1557 | |
| 1558 count = _dyld_image_count(); | |
| 1559 for (i = 1; i < count; i++) { | |
| 1560 const char *name = _dyld_get_image_name(i); | |
| 1561 intptr_t slide = _dyld_get_image_vmaddr_slide(i); | |
| 1562 st->print_cr(PTR_FORMAT " \t%s", slide, name); | |
| 1563 } | |
| 1564 #else | |
| 1565 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1566 #endif | |
| 1567 } | |
| 1568 | |
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1569 void os::print_os_info_brief(outputStream* st) { |
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1570 st->print("Bsd"); |
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1571 |
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1572 os::Posix::print_uname_info(st); |
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1573 } |
| 3960 | 1574 |
| 1575 void os::print_os_info(outputStream* st) { | |
| 1576 st->print("OS:"); | |
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1577 st->print("Bsd"); |
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1578 |
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1579 os::Posix::print_uname_info(st); |
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1580 |
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1581 os::Posix::print_rlimit_info(st); |
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1582 |
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1583 os::Posix::print_load_average(st); |
| 3960 | 1584 } |
| 1585 | |
| 1586 void os::pd_print_cpu_info(outputStream* st) { | |
| 1587 // Nothing to do for now. | |
| 1588 } | |
| 1589 | |
| 1590 void os::print_memory_info(outputStream* st) { | |
| 1591 | |
| 1592 st->print("Memory:"); | |
| 1593 st->print(" %dk page", os::vm_page_size()>>10); | |
| 1594 | |
| 1595 st->print(", physical " UINT64_FORMAT "k", | |
| 1596 os::physical_memory() >> 10); | |
| 1597 st->print("(" UINT64_FORMAT "k free)", | |
| 1598 os::available_memory() >> 10); | |
| 1599 st->cr(); | |
| 1600 | |
| 1601 // meminfo | |
| 1602 st->print("\n/proc/meminfo:\n"); | |
| 1603 _print_ascii_file("/proc/meminfo", st); | |
| 1604 st->cr(); | |
| 1605 } | |
| 1606 | |
| 1607 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
| 1608 // but they're the same for all the bsd arch that we support | |
| 1609 // and they're the same for solaris but there's no common place to put this. | |
| 1610 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
| 1611 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
| 1612 "ILL_COPROC", "ILL_BADSTK" }; | |
| 1613 | |
| 1614 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
| 1615 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
| 1616 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
| 1617 | |
| 1618 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
| 1619 | |
| 1620 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
| 1621 | |
| 1622 void os::print_siginfo(outputStream* st, void* siginfo) { | |
| 1623 st->print("siginfo:"); | |
| 1624 | |
| 1625 const int buflen = 100; | |
| 1626 char buf[buflen]; | |
| 1627 siginfo_t *si = (siginfo_t*)siginfo; | |
| 1628 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
| 1629 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
| 1630 st->print("si_errno=%s", buf); | |
| 1631 } else { | |
| 1632 st->print("si_errno=%d", si->si_errno); | |
| 1633 } | |
| 1634 const int c = si->si_code; | |
| 1635 assert(c > 0, "unexpected si_code"); | |
| 1636 switch (si->si_signo) { | |
| 1637 case SIGILL: | |
| 1638 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
| 1639 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1640 break; | |
| 1641 case SIGFPE: | |
| 1642 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
| 1643 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1644 break; | |
| 1645 case SIGSEGV: | |
| 1646 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
| 1647 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1648 break; | |
| 1649 case SIGBUS: | |
| 1650 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
| 1651 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1652 break; | |
| 1653 default: | |
| 1654 st->print(", si_code=%d", si->si_code); | |
| 1655 // no si_addr | |
| 1656 } | |
| 1657 | |
| 1658 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
| 1659 UseSharedSpaces) { | |
| 1660 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 1661 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
| 1662 st->print("\n\nError accessing class data sharing archive." \ | |
| 1663 " Mapped file inaccessible during execution, " \ | |
| 1664 " possible disk/network problem."); | |
| 1665 } | |
| 1666 } | |
| 1667 st->cr(); | |
| 1668 } | |
| 1669 | |
| 1670 | |
| 1671 static void print_signal_handler(outputStream* st, int sig, | |
| 1672 char* buf, size_t buflen); | |
| 1673 | |
| 1674 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 1675 st->print_cr("Signal Handlers:"); | |
| 1676 print_signal_handler(st, SIGSEGV, buf, buflen); | |
| 1677 print_signal_handler(st, SIGBUS , buf, buflen); | |
| 1678 print_signal_handler(st, SIGFPE , buf, buflen); | |
| 1679 print_signal_handler(st, SIGPIPE, buf, buflen); | |
| 1680 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
| 1681 print_signal_handler(st, SIGILL , buf, buflen); | |
| 1682 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
| 1683 print_signal_handler(st, SR_signum, buf, buflen); | |
| 1684 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
| 1685 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
| 1686 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
| 1687 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
| 1688 } | |
| 1689 | |
| 1690 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
| 1691 | |
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1692 // Find the full path to the current module, libjvm |
| 3960 | 1693 void os::jvm_path(char *buf, jint buflen) { |
| 1694 // Error checking. | |
| 1695 if (buflen < MAXPATHLEN) { | |
| 1696 assert(false, "must use a large-enough buffer"); | |
| 1697 buf[0] = '\0'; | |
| 1698 return; | |
| 1699 } | |
| 1700 // Lazy resolve the path to current module. | |
| 1701 if (saved_jvm_path[0] != 0) { | |
| 1702 strcpy(buf, saved_jvm_path); | |
| 1703 return; | |
| 1704 } | |
| 1705 | |
| 1706 char dli_fname[MAXPATHLEN]; | |
| 1707 bool ret = dll_address_to_library_name( | |
| 1708 CAST_FROM_FN_PTR(address, os::jvm_path), | |
| 1709 dli_fname, sizeof(dli_fname), NULL); | |
| 1710 assert(ret != 0, "cannot locate libjvm"); | |
| 1711 char *rp = realpath(dli_fname, buf); | |
| 1712 if (rp == NULL) | |
| 1713 return; | |
| 1714 | |
| 1715 if (Arguments::created_by_gamma_launcher()) { | |
| 1716 // Support for the gamma launcher. Typical value for buf is | |
| 4846 | 1717 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
| 3960 | 1718 // the right place in the string, then assume we are installed in a JDK and |
| 4846 | 1719 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
| 1720 // construct a path to the JVM being overridden. | |
| 1721 | |
| 3960 | 1722 const char *p = buf + strlen(buf) - 1; |
| 1723 for (int count = 0; p > buf && count < 5; ++count) { | |
| 1724 for (--p; p > buf && *p != '/'; --p) | |
| 1725 /* empty */ ; | |
| 1726 } | |
| 1727 | |
| 1728 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
| 1729 // Look for JAVA_HOME in the environment. | |
| 1730 char* java_home_var = ::getenv("JAVA_HOME"); | |
| 1731 if (java_home_var != NULL && java_home_var[0] != 0) { | |
| 1732 char* jrelib_p; | |
| 1733 int len; | |
| 1734 | |
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1735 // Check the current module name "libjvm" |
| 3960 | 1736 p = strrchr(buf, '/'); |
| 1737 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
| 1738 | |
| 1739 rp = realpath(java_home_var, buf); | |
| 1740 if (rp == NULL) | |
| 1741 return; | |
| 1742 | |
| 1743 // determine if this is a legacy image or modules image | |
| 1744 // modules image doesn't have "jre" subdirectory | |
| 1745 len = strlen(buf); | |
| 1746 jrelib_p = buf + len; | |
| 4846 | 1747 |
| 1748 // Add the appropriate library subdir | |
| 1749 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
| 3960 | 1750 if (0 != access(buf, F_OK)) { |
| 4846 | 1751 snprintf(jrelib_p, buflen-len, "/lib"); |
| 3960 | 1752 } |
| 1753 | |
| 4846 | 1754 // Add the appropriate client or server subdir |
| 1755 len = strlen(buf); | |
| 1756 jrelib_p = buf + len; | |
| 1757 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
| 1758 if (0 != access(buf, F_OK)) { | |
| 1759 snprintf(jrelib_p, buflen-len, ""); | |
| 1760 } | |
| 1761 | |
| 1762 // If the path exists within JAVA_HOME, add the JVM library name | |
| 1763 // to complete the path to JVM being overridden. Otherwise fallback | |
| 1764 // to the path to the current library. | |
| 3960 | 1765 if (0 == access(buf, F_OK)) { |
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1766 // Use current module name "libjvm" |
| 3960 | 1767 len = strlen(buf); |
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1768 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
| 3960 | 1769 } else { |
| 4846 | 1770 // Fall back to path of current library |
| 3960 | 1771 rp = realpath(dli_fname, buf); |
| 1772 if (rp == NULL) | |
| 1773 return; | |
| 1774 } | |
| 1775 } | |
| 1776 } | |
| 1777 } | |
| 1778 | |
| 1779 strcpy(saved_jvm_path, buf); | |
| 1780 } | |
| 1781 | |
| 1782 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 1783 // no prefix required, not even "_" | |
| 1784 } | |
| 1785 | |
| 1786 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 1787 // no suffix required | |
| 1788 } | |
| 1789 | |
| 1790 //////////////////////////////////////////////////////////////////////////////// | |
| 1791 // sun.misc.Signal support | |
| 1792 | |
| 1793 static volatile jint sigint_count = 0; | |
| 1794 | |
| 1795 static void | |
| 1796 UserHandler(int sig, void *siginfo, void *context) { | |
| 1797 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
| 1798 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
| 1799 // don't want to flood the manager thread with sem_post requests. | |
| 1800 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
| 1801 return; | |
| 1802 | |
| 1803 // Ctrl-C is pressed during error reporting, likely because the error | |
| 1804 // handler fails to abort. Let VM die immediately. | |
| 1805 if (sig == SIGINT && is_error_reported()) { | |
| 1806 os::die(); | |
| 1807 } | |
| 1808 | |
| 1809 os::signal_notify(sig); | |
| 1810 } | |
| 1811 | |
| 1812 void* os::user_handler() { | |
| 1813 return CAST_FROM_FN_PTR(void*, UserHandler); | |
| 1814 } | |
| 1815 | |
| 1816 extern "C" { | |
| 1817 typedef void (*sa_handler_t)(int); | |
| 1818 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
| 1819 } | |
| 1820 | |
| 1821 void* os::signal(int signal_number, void* handler) { | |
| 1822 struct sigaction sigAct, oldSigAct; | |
| 1823 | |
| 1824 sigfillset(&(sigAct.sa_mask)); | |
| 1825 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 1826 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
| 1827 | |
| 1828 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
| 1829 // -1 means registration failed | |
| 1830 return (void *)-1; | |
| 1831 } | |
| 1832 | |
| 1833 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
| 1834 } | |
| 1835 | |
| 1836 void os::signal_raise(int signal_number) { | |
| 1837 ::raise(signal_number); | |
| 1838 } | |
| 1839 | |
| 1840 /* | |
| 1841 * The following code is moved from os.cpp for making this | |
| 1842 * code platform specific, which it is by its very nature. | |
| 1843 */ | |
| 1844 | |
| 1845 // Will be modified when max signal is changed to be dynamic | |
| 1846 int os::sigexitnum_pd() { | |
| 1847 return NSIG; | |
| 1848 } | |
| 1849 | |
| 1850 // a counter for each possible signal value | |
| 1851 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 1852 | |
| 1853 // Bsd(POSIX) specific hand shaking semaphore. | |
| 1854 #ifdef __APPLE__ | |
| 1855 static semaphore_t sig_sem; | |
| 1856 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) | |
| 1857 #define SEM_WAIT(sem) semaphore_wait(sem); | |
| 1858 #define SEM_POST(sem) semaphore_signal(sem); | |
| 1859 #else | |
| 1860 static sem_t sig_sem; | |
| 1861 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) | |
| 1862 #define SEM_WAIT(sem) sem_wait(&sem); | |
| 1863 #define SEM_POST(sem) sem_post(&sem); | |
| 1864 #endif | |
| 1865 | |
| 1866 void os::signal_init_pd() { | |
| 1867 // Initialize signal structures | |
| 1868 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 1869 | |
| 1870 // Initialize signal semaphore | |
| 1871 ::SEM_INIT(sig_sem, 0); | |
| 1872 } | |
| 1873 | |
| 1874 void os::signal_notify(int sig) { | |
| 1875 Atomic::inc(&pending_signals[sig]); | |
| 1876 ::SEM_POST(sig_sem); | |
| 1877 } | |
| 1878 | |
| 1879 static int check_pending_signals(bool wait) { | |
| 1880 Atomic::store(0, &sigint_count); | |
| 1881 for (;;) { | |
| 1882 for (int i = 0; i < NSIG + 1; i++) { | |
| 1883 jint n = pending_signals[i]; | |
| 1884 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 1885 return i; | |
| 1886 } | |
| 1887 } | |
| 1888 if (!wait) { | |
| 1889 return -1; | |
| 1890 } | |
| 1891 JavaThread *thread = JavaThread::current(); | |
| 1892 ThreadBlockInVM tbivm(thread); | |
| 1893 | |
| 1894 bool threadIsSuspended; | |
| 1895 do { | |
| 1896 thread->set_suspend_equivalent(); | |
| 1897 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 1898 ::SEM_WAIT(sig_sem); | |
| 1899 | |
| 1900 // were we externally suspended while we were waiting? | |
| 1901 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 1902 if (threadIsSuspended) { | |
| 1903 // | |
| 1904 // The semaphore has been incremented, but while we were waiting | |
| 1905 // another thread suspended us. We don't want to continue running | |
| 1906 // while suspended because that would surprise the thread that | |
| 1907 // suspended us. | |
| 1908 // | |
| 1909 ::SEM_POST(sig_sem); | |
| 1910 | |
| 1911 thread->java_suspend_self(); | |
| 1912 } | |
| 1913 } while (threadIsSuspended); | |
| 1914 } | |
| 1915 } | |
| 1916 | |
| 1917 int os::signal_lookup() { | |
| 1918 return check_pending_signals(false); | |
| 1919 } | |
| 1920 | |
| 1921 int os::signal_wait() { | |
| 1922 return check_pending_signals(true); | |
| 1923 } | |
| 1924 | |
| 1925 //////////////////////////////////////////////////////////////////////////////// | |
| 1926 // Virtual Memory | |
| 1927 | |
| 1928 int os::vm_page_size() { | |
| 1929 // Seems redundant as all get out | |
| 1930 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 1931 return os::Bsd::page_size(); | |
| 1932 } | |
| 1933 | |
| 1934 // Solaris allocates memory by pages. | |
| 1935 int os::vm_allocation_granularity() { | |
| 1936 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 1937 return os::Bsd::page_size(); | |
| 1938 } | |
| 1939 | |
| 1940 // Rationale behind this function: | |
| 1941 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
| 1942 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
| 1943 // samples for JITted code. Here we create private executable mapping over the code cache | |
| 1944 // and then we can use standard (well, almost, as mapping can change) way to provide | |
| 1945 // info for the reporting script by storing timestamp and location of symbol | |
| 1946 void bsd_wrap_code(char* base, size_t size) { | |
| 1947 static volatile jint cnt = 0; | |
| 1948 | |
| 1949 if (!UseOprofile) { | |
| 1950 return; | |
| 1951 } | |
| 1952 | |
| 1953 char buf[PATH_MAX + 1]; | |
| 1954 int num = Atomic::add(1, &cnt); | |
| 1955 | |
| 1956 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
| 1957 os::get_temp_directory(), os::current_process_id(), num); | |
| 1958 unlink(buf); | |
| 1959 | |
| 1960 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
| 1961 | |
| 1962 if (fd != -1) { | |
| 1963 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
| 1964 if (rv != (off_t)-1) { | |
| 1965 if (::write(fd, "", 1) == 1) { | |
| 1966 mmap(base, size, | |
| 1967 PROT_READ|PROT_WRITE|PROT_EXEC, | |
| 1968 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
| 1969 } | |
| 1970 } | |
| 1971 ::close(fd); | |
| 1972 unlink(buf); | |
| 1973 } | |
| 1974 } | |
| 1975 | |
| 1976 // NOTE: Bsd kernel does not really reserve the pages for us. | |
| 1977 // All it does is to check if there are enough free pages | |
| 1978 // left at the time of mmap(). This could be a potential | |
| 1979 // problem. | |
| 6197 | 1980 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| 3960 | 1981 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| 1982 #ifdef __OpenBSD__ | |
| 1983 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 1984 return ::mprotect(addr, size, prot) == 0; | |
| 1985 #else | |
| 1986 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
| 1987 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
| 1988 return res != (uintptr_t) MAP_FAILED; | |
| 1989 #endif | |
| 1990 } | |
| 1991 | |
| 1992 | |
| 6197 | 1993 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| 3960 | 1994 bool exec) { |
| 1995 return commit_memory(addr, size, exec); | |
| 1996 } | |
| 1997 | |
| 6197 | 1998 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 1999 } |
| 2000 | |
| 6197 | 2001 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2002 ::madvise(addr, bytes, MADV_DONTNEED); |
| 2003 } | |
| 2004 | |
| 2005 void os::numa_make_global(char *addr, size_t bytes) { | |
| 2006 } | |
| 2007 | |
| 2008 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
| 2009 } | |
| 2010 | |
| 2011 bool os::numa_topology_changed() { return false; } | |
| 2012 | |
| 2013 size_t os::numa_get_groups_num() { | |
| 2014 return 1; | |
| 2015 } | |
| 2016 | |
| 2017 int os::numa_get_group_id() { | |
| 2018 return 0; | |
| 2019 } | |
| 2020 | |
| 2021 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
| 2022 if (size > 0) { | |
| 2023 ids[0] = 0; | |
| 2024 return 1; | |
| 2025 } | |
| 2026 return 0; | |
| 2027 } | |
| 2028 | |
| 2029 bool os::get_page_info(char *start, page_info* info) { | |
| 2030 return false; | |
| 2031 } | |
| 2032 | |
| 2033 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2034 return end; | |
| 2035 } | |
| 2036 | |
| 2037 | |
| 6197 | 2038 bool os::pd_uncommit_memory(char* addr, size_t size) { |
| 3960 | 2039 #ifdef __OpenBSD__ |
| 2040 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 2041 return ::mprotect(addr, size, PROT_NONE) == 0; | |
| 2042 #else | |
| 2043 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
| 2044 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
| 2045 return res != (uintptr_t) MAP_FAILED; | |
| 2046 #endif | |
| 2047 } | |
| 2048 | |
| 6197 | 2049 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
| 3960 | 2050 return os::commit_memory(addr, size); |
| 2051 } | |
| 2052 | |
| 2053 // If this is a growable mapping, remove the guard pages entirely by | |
| 2054 // munmap()ping them. If not, just call uncommit_memory(). | |
| 2055 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
| 2056 return os::uncommit_memory(addr, size); | |
| 2057 } | |
| 2058 | |
| 2059 static address _highest_vm_reserved_address = NULL; | |
| 2060 | |
| 2061 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
| 2062 // at 'requested_addr'. If there are existing memory mappings at the same | |
| 2063 // location, however, they will be overwritten. If 'fixed' is false, | |
| 2064 // 'requested_addr' is only treated as a hint, the return value may or | |
| 2065 // may not start from the requested address. Unlike Bsd mmap(), this | |
| 2066 // function returns NULL to indicate failure. | |
| 2067 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
| 2068 char * addr; | |
| 2069 int flags; | |
| 2070 | |
| 2071 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
| 2072 if (fixed) { | |
| 2073 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
| 2074 flags |= MAP_FIXED; | |
| 2075 } | |
| 2076 | |
| 2077 // Map uncommitted pages PROT_READ and PROT_WRITE, change access | |
| 2078 // to PROT_EXEC if executable when we commit the page. | |
| 2079 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, | |
| 2080 flags, -1, 0); | |
| 2081 | |
| 2082 if (addr != MAP_FAILED) { | |
| 2083 // anon_mmap() should only get called during VM initialization, | |
| 2084 // don't need lock (actually we can skip locking even it can be called | |
| 2085 // from multiple threads, because _highest_vm_reserved_address is just a | |
| 2086 // hint about the upper limit of non-stack memory regions.) | |
| 2087 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
| 2088 _highest_vm_reserved_address = (address)addr + bytes; | |
| 2089 } | |
| 2090 } | |
| 2091 | |
| 2092 return addr == MAP_FAILED ? NULL : addr; | |
| 2093 } | |
| 2094 | |
| 2095 // Don't update _highest_vm_reserved_address, because there might be memory | |
| 2096 // regions above addr + size. If so, releasing a memory region only creates | |
| 2097 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
| 2098 // | |
| 2099 static int anon_munmap(char * addr, size_t size) { | |
| 2100 return ::munmap(addr, size) == 0; | |
| 2101 } | |
| 2102 | |
| 6197 | 2103 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| 3960 | 2104 size_t alignment_hint) { |
| 2105 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
| 2106 } | |
| 2107 | |
| 6197 | 2108 bool os::pd_release_memory(char* addr, size_t size) { |
| 3960 | 2109 return anon_munmap(addr, size); |
| 2110 } | |
| 2111 | |
| 2112 static address highest_vm_reserved_address() { | |
| 2113 return _highest_vm_reserved_address; | |
| 2114 } | |
| 2115 | |
| 2116 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
| 2117 // Bsd wants the mprotect address argument to be page aligned. | |
| 2118 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
| 2119 | |
| 2120 // According to SUSv3, mprotect() should only be used with mappings | |
| 2121 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
| 2122 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
| 2123 // protection of malloc'ed or statically allocated memory). Check the | |
| 2124 // caller if you hit this assert. | |
| 2125 assert(addr == bottom, "sanity check"); | |
| 2126 | |
| 2127 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
| 2128 return ::mprotect(bottom, size, prot) == 0; | |
| 2129 } | |
| 2130 | |
| 2131 // Set protections specified | |
| 2132 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
| 2133 bool is_committed) { | |
| 2134 unsigned int p = 0; | |
| 2135 switch (prot) { | |
| 2136 case MEM_PROT_NONE: p = PROT_NONE; break; | |
| 2137 case MEM_PROT_READ: p = PROT_READ; break; | |
| 2138 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
| 2139 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
| 2140 default: | |
| 2141 ShouldNotReachHere(); | |
| 2142 } | |
| 2143 // is_committed is unused. | |
| 2144 return bsd_mprotect(addr, bytes, p); | |
| 2145 } | |
| 2146 | |
| 2147 bool os::guard_memory(char* addr, size_t size) { | |
| 2148 return bsd_mprotect(addr, size, PROT_NONE); | |
| 2149 } | |
| 2150 | |
| 2151 bool os::unguard_memory(char* addr, size_t size) { | |
| 2152 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
| 2153 } | |
| 2154 | |
| 2155 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
| 6918 | 2156 return false; |
| 3960 | 2157 } |
| 2158 | |
| 2159 /* | |
| 2160 * Set the coredump_filter bits to include largepages in core dump (bit 6) | |
| 2161 * | |
| 2162 * From the coredump_filter documentation: | |
| 2163 * | |
| 2164 * - (bit 0) anonymous private memory | |
| 2165 * - (bit 1) anonymous shared memory | |
| 2166 * - (bit 2) file-backed private memory | |
| 2167 * - (bit 3) file-backed shared memory | |
| 2168 * - (bit 4) ELF header pages in file-backed private memory areas (it is | |
| 2169 * effective only if the bit 2 is cleared) | |
| 2170 * - (bit 5) hugetlb private memory | |
| 2171 * - (bit 6) hugetlb shared memory | |
| 2172 */ | |
| 2173 static void set_coredump_filter(void) { | |
| 2174 FILE *f; | |
| 2175 long cdm; | |
| 2176 | |
| 2177 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { | |
| 2178 return; | |
| 2179 } | |
| 2180 | |
| 2181 if (fscanf(f, "%lx", &cdm) != 1) { | |
| 2182 fclose(f); | |
| 2183 return; | |
| 2184 } | |
| 2185 | |
| 2186 rewind(f); | |
| 2187 | |
| 2188 if ((cdm & LARGEPAGES_BIT) == 0) { | |
| 2189 cdm |= LARGEPAGES_BIT; | |
| 2190 fprintf(f, "%#lx", cdm); | |
| 2191 } | |
| 2192 | |
| 2193 fclose(f); | |
| 2194 } | |
| 2195 | |
| 2196 // Large page support | |
| 2197 | |
| 2198 static size_t _large_page_size = 0; | |
| 2199 | |
| 2200 void os::large_page_init() { | |
| 2201 } | |
| 2202 | |
| 2203 | |
| 2204 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { | |
| 2205 // "exec" is passed in but not used. Creating the shared image for | |
| 2206 // the code cache doesn't have an SHM_X executable permission to check. | |
| 2207 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
| 2208 | |
| 2209 key_t key = IPC_PRIVATE; | |
| 2210 char *addr; | |
| 2211 | |
| 2212 bool warn_on_failure = UseLargePages && | |
| 2213 (!FLAG_IS_DEFAULT(UseLargePages) || | |
| 2214 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
| 2215 ); | |
| 2216 char msg[128]; | |
| 2217 | |
| 2218 // Create a large shared memory region to attach to based on size. | |
| 2219 // Currently, size is the total size of the heap | |
| 2220 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
| 2221 if (shmid == -1) { | |
| 2222 // Possible reasons for shmget failure: | |
| 2223 // 1. shmmax is too small for Java heap. | |
| 2224 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
| 2225 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
| 2226 // 2. not enough large page memory. | |
| 2227 // > check available large pages: cat /proc/meminfo | |
| 2228 // > increase amount of large pages: | |
| 2229 // echo new_value > /proc/sys/vm/nr_hugepages | |
| 2230 // Note 1: different Bsd may use different name for this property, | |
| 2231 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
| 2232 // Note 2: it's possible there's enough physical memory available but | |
| 2233 // they are so fragmented after a long run that they can't | |
| 2234 // coalesce into large pages. Try to reserve large pages when | |
| 2235 // the system is still "fresh". | |
| 2236 if (warn_on_failure) { | |
| 2237 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
| 2238 warning(msg); | |
| 2239 } | |
| 2240 return NULL; | |
| 2241 } | |
| 2242 | |
| 2243 // attach to the region | |
| 2244 addr = (char*)shmat(shmid, req_addr, 0); | |
| 2245 int err = errno; | |
| 2246 | |
| 2247 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
| 2248 // will be deleted when it's detached by shmdt() or when the process | |
| 2249 // terminates. If shmat() is not successful this will remove the shared | |
| 2250 // segment immediately. | |
| 2251 shmctl(shmid, IPC_RMID, NULL); | |
| 2252 | |
| 2253 if ((intptr_t)addr == -1) { | |
| 2254 if (warn_on_failure) { | |
| 2255 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
| 2256 warning(msg); | |
| 2257 } | |
| 2258 return NULL; | |
| 2259 } | |
| 2260 | |
| 2261 return addr; | |
| 2262 } | |
| 2263 | |
| 2264 bool os::release_memory_special(char* base, size_t bytes) { | |
| 2265 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
| 2266 int rslt = shmdt(base); | |
| 2267 return rslt == 0; | |
| 2268 } | |
| 2269 | |
| 2270 size_t os::large_page_size() { | |
| 2271 return _large_page_size; | |
| 2272 } | |
| 2273 | |
| 2274 // HugeTLBFS allows application to commit large page memory on demand; | |
| 2275 // with SysV SHM the entire memory region must be allocated as shared | |
| 2276 // memory. | |
| 2277 bool os::can_commit_large_page_memory() { | |
| 2278 return UseHugeTLBFS; | |
| 2279 } | |
| 2280 | |
| 2281 bool os::can_execute_large_page_memory() { | |
| 2282 return UseHugeTLBFS; | |
| 2283 } | |
| 2284 | |
| 2285 // Reserve memory at an arbitrary address, only if that area is | |
| 2286 // available (and not reserved for something else). | |
| 2287 | |
| 6197 | 2288 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| 3960 | 2289 const int max_tries = 10; |
| 2290 char* base[max_tries]; | |
| 2291 size_t size[max_tries]; | |
| 2292 const size_t gap = 0x000000; | |
| 2293 | |
| 2294 // Assert only that the size is a multiple of the page size, since | |
| 2295 // that's all that mmap requires, and since that's all we really know | |
| 2296 // about at this low abstraction level. If we need higher alignment, | |
| 2297 // we can either pass an alignment to this method or verify alignment | |
| 2298 // in one of the methods further up the call chain. See bug 5044738. | |
| 2299 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
| 2300 | |
| 2301 // Repeatedly allocate blocks until the block is allocated at the | |
| 2302 // right spot. Give up after max_tries. Note that reserve_memory() will | |
| 2303 // automatically update _highest_vm_reserved_address if the call is | |
| 2304 // successful. The variable tracks the highest memory address every reserved | |
| 2305 // by JVM. It is used to detect heap-stack collision if running with | |
| 2306 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
| 2307 // space than needed, it could confuse the collision detecting code. To | |
| 2308 // solve the problem, save current _highest_vm_reserved_address and | |
| 2309 // calculate the correct value before return. | |
| 2310 address old_highest = _highest_vm_reserved_address; | |
| 2311 | |
| 2312 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
| 2313 // if kernel honors the hint then we can return immediately. | |
| 2314 char * addr = anon_mmap(requested_addr, bytes, false); | |
| 2315 if (addr == requested_addr) { | |
| 2316 return requested_addr; | |
| 2317 } | |
| 2318 | |
| 2319 if (addr != NULL) { | |
| 2320 // mmap() is successful but it fails to reserve at the requested address | |
| 2321 anon_munmap(addr, bytes); | |
| 2322 } | |
| 2323 | |
| 2324 int i; | |
| 2325 for (i = 0; i < max_tries; ++i) { | |
| 2326 base[i] = reserve_memory(bytes); | |
| 2327 | |
| 2328 if (base[i] != NULL) { | |
| 2329 // Is this the block we wanted? | |
| 2330 if (base[i] == requested_addr) { | |
| 2331 size[i] = bytes; | |
| 2332 break; | |
| 2333 } | |
| 2334 | |
| 2335 // Does this overlap the block we wanted? Give back the overlapped | |
| 2336 // parts and try again. | |
| 2337 | |
| 2338 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
| 2339 if (top_overlap >= 0 && top_overlap < bytes) { | |
| 2340 unmap_memory(base[i], top_overlap); | |
| 2341 base[i] += top_overlap; | |
| 2342 size[i] = bytes - top_overlap; | |
| 2343 } else { | |
| 2344 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
| 2345 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
| 2346 unmap_memory(requested_addr, bottom_overlap); | |
| 2347 size[i] = bytes - bottom_overlap; | |
| 2348 } else { | |
| 2349 size[i] = bytes; | |
| 2350 } | |
| 2351 } | |
| 2352 } | |
| 2353 } | |
| 2354 | |
| 2355 // Give back the unused reserved pieces. | |
| 2356 | |
| 2357 for (int j = 0; j < i; ++j) { | |
| 2358 if (base[j] != NULL) { | |
| 2359 unmap_memory(base[j], size[j]); | |
| 2360 } | |
| 2361 } | |
| 2362 | |
| 2363 if (i < max_tries) { | |
| 2364 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
| 2365 return requested_addr; | |
| 2366 } else { | |
| 2367 _highest_vm_reserved_address = old_highest; | |
| 2368 return NULL; | |
| 2369 } | |
| 2370 } | |
| 2371 | |
| 2372 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 2373 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
| 2374 } | |
| 2375 | |
| 2376 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
| 2377 // Solaris uses poll(), bsd uses park(). | |
| 2378 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
| 2379 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
| 2380 // SIGSEGV, see 4355769. | |
| 2381 | |
| 2382 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
| 2383 assert(thread == Thread::current(), "thread consistency check"); | |
| 2384 | |
| 2385 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2386 slp->reset() ; | |
| 2387 OrderAccess::fence() ; | |
| 2388 | |
| 2389 if (interruptible) { | |
| 2390 jlong prevtime = javaTimeNanos(); | |
| 2391 | |
| 2392 for (;;) { | |
| 2393 if (os::is_interrupted(thread, true)) { | |
| 2394 return OS_INTRPT; | |
| 2395 } | |
| 2396 | |
| 2397 jlong newtime = javaTimeNanos(); | |
| 2398 | |
| 2399 if (newtime - prevtime < 0) { | |
| 2400 // time moving backwards, should only happen if no monotonic clock | |
| 2401 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2402 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2403 } else { | |
|
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2404 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2405 } |
| 2406 | |
| 2407 if(millis <= 0) { | |
| 2408 return OS_OK; | |
| 2409 } | |
| 2410 | |
| 2411 prevtime = newtime; | |
| 2412 | |
| 2413 { | |
| 2414 assert(thread->is_Java_thread(), "sanity check"); | |
| 2415 JavaThread *jt = (JavaThread *) thread; | |
| 2416 ThreadBlockInVM tbivm(jt); | |
| 2417 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
| 2418 | |
| 2419 jt->set_suspend_equivalent(); | |
| 2420 // cleared by handle_special_suspend_equivalent_condition() or | |
| 2421 // java_suspend_self() via check_and_wait_while_suspended() | |
| 2422 | |
| 2423 slp->park(millis); | |
| 2424 | |
| 2425 // were we externally suspended while we were waiting? | |
| 2426 jt->check_and_wait_while_suspended(); | |
| 2427 } | |
| 2428 } | |
| 2429 } else { | |
| 2430 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 2431 jlong prevtime = javaTimeNanos(); | |
| 2432 | |
| 2433 for (;;) { | |
| 2434 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
| 2435 // the 1st iteration ... | |
| 2436 jlong newtime = javaTimeNanos(); | |
| 2437 | |
| 2438 if (newtime - prevtime < 0) { | |
| 2439 // time moving backwards, should only happen if no monotonic clock | |
| 2440 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2441 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2442 } else { | |
|
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2443 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2444 } |
| 2445 | |
| 2446 if(millis <= 0) break ; | |
| 2447 | |
| 2448 prevtime = newtime; | |
| 2449 slp->park(millis); | |
| 2450 } | |
| 2451 return OS_OK ; | |
| 2452 } | |
| 2453 } | |
| 2454 | |
| 2455 int os::naked_sleep() { | |
| 2456 // %% make the sleep time an integer flag. for now use 1 millisec. | |
| 2457 return os::sleep(Thread::current(), 1, false); | |
| 2458 } | |
| 2459 | |
| 2460 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 2461 void os::infinite_sleep() { | |
| 2462 while (true) { // sleep forever ... | |
| 2463 ::sleep(100); // ... 100 seconds at a time | |
| 2464 } | |
| 2465 } | |
| 2466 | |
| 2467 // Used to convert frequent JVM_Yield() to nops | |
| 2468 bool os::dont_yield() { | |
| 2469 return DontYieldALot; | |
| 2470 } | |
| 2471 | |
| 2472 void os::yield() { | |
| 2473 sched_yield(); | |
| 2474 } | |
| 2475 | |
| 2476 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
| 2477 | |
| 2478 void os::yield_all(int attempts) { | |
| 2479 // Yields to all threads, including threads with lower priorities | |
| 2480 // Threads on Bsd are all with same priority. The Solaris style | |
| 2481 // os::yield_all() with nanosleep(1ms) is not necessary. | |
| 2482 sched_yield(); | |
| 2483 } | |
| 2484 | |
| 2485 // Called from the tight loops to possibly influence time-sharing heuristics | |
| 2486 void os::loop_breaker(int attempts) { | |
| 2487 os::yield_all(attempts); | |
| 2488 } | |
| 2489 | |
| 2490 //////////////////////////////////////////////////////////////////////////////// | |
| 2491 // thread priority support | |
| 2492 | |
| 2493 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
| 2494 // only supports dynamic priority, static priority must be zero. For real-time | |
| 2495 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
| 2496 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
| 2497 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
| 2498 // of 5 runs - Sep 2005). | |
| 2499 // | |
| 2500 // The following code actually changes the niceness of kernel-thread/LWP. It | |
| 2501 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
| 2502 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
| 2503 // threads. It has always been the case, but could change in the future. For | |
| 2504 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
| 2505 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
| 2506 | |
| 6918 | 2507 #if !defined(__APPLE__) |
|
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2508 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2509 19, // 0 Entry should never be used |
| 2510 | |
| 2511 0, // 1 MinPriority | |
| 2512 3, // 2 | |
| 2513 6, // 3 | |
| 2514 | |
|
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2515 10, // 4 |
|
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2516 15, // 5 NormPriority |
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2517 18, // 6 |
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2518 |
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2519 21, // 7 |
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2520 25, // 8 |
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2521 28, // 9 NearMaxPriority |
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2522 |
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2523 31, // 10 MaxPriority |
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2524 |
|
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2525 31 // 11 CriticalPriority |
| 3960 | 2526 }; |
| 6918 | 2527 #else |
| 3960 | 2528 /* Using Mach high-level priority assignments */ |
|
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2529 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2530 0, // 0 Entry should never be used (MINPRI_USER) |
| 2531 | |
| 2532 27, // 1 MinPriority | |
| 2533 28, // 2 | |
| 2534 29, // 3 | |
| 2535 | |
| 2536 30, // 4 | |
| 2537 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
| 2538 32, // 6 | |
| 2539 | |
| 2540 33, // 7 | |
| 2541 34, // 8 | |
| 2542 35, // 9 NearMaxPriority | |
| 2543 | |
|
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2544 36, // 10 MaxPriority |
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2545 |
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|
2546 36 // 11 CriticalPriority |
| 3960 | 2547 }; |
| 2548 #endif | |
| 2549 | |
| 2550 static int prio_init() { | |
| 2551 if (ThreadPriorityPolicy == 1) { | |
| 2552 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
| 2553 // if effective uid is not root. Perhaps, a more elegant way of doing | |
| 2554 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
| 2555 if (geteuid() != 0) { | |
| 2556 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
| 2557 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
| 2558 } | |
| 2559 ThreadPriorityPolicy = 0; | |
| 2560 } | |
| 2561 } | |
|
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2562 if (UseCriticalJavaThreadPriority) { |
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2563 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
|
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2564 } |
| 3960 | 2565 return 0; |
| 2566 } | |
| 2567 | |
| 2568 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
| 2569 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
| 2570 | |
| 2571 #ifdef __OpenBSD__ | |
| 2572 // OpenBSD pthread_setprio starves low priority threads | |
| 2573 return OS_OK; | |
| 2574 #elif defined(__FreeBSD__) | |
| 2575 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
| 2576 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2577 struct sched_param sp; | |
| 2578 int policy; | |
| 2579 pthread_t self = pthread_self(); | |
| 2580 | |
| 2581 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
| 2582 return OS_ERR; | |
| 2583 | |
| 2584 sp.sched_priority = newpri; | |
| 2585 if (pthread_setschedparam(self, policy, &sp) != 0) | |
| 2586 return OS_ERR; | |
| 2587 | |
| 2588 return OS_OK; | |
| 2589 #else | |
| 2590 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
| 2591 return (ret == 0) ? OS_OK : OS_ERR; | |
| 2592 #endif | |
| 2593 } | |
| 2594 | |
| 2595 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
| 2596 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
| 2597 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 2598 return OS_OK; | |
| 2599 } | |
| 2600 | |
| 2601 errno = 0; | |
| 2602 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
| 2603 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
| 2604 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2605 int policy; | |
| 2606 struct sched_param sp; | |
| 2607 | |
| 2608 pthread_getschedparam(pthread_self(), &policy, &sp); | |
| 2609 *priority_ptr = sp.sched_priority; | |
| 2610 #else | |
| 2611 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
| 2612 #endif | |
| 2613 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
| 2614 } | |
| 2615 | |
| 2616 // Hint to the underlying OS that a task switch would not be good. | |
| 2617 // Void return because it's a hint and can fail. | |
| 2618 void os::hint_no_preempt() {} | |
| 2619 | |
| 2620 //////////////////////////////////////////////////////////////////////////////// | |
| 2621 // suspend/resume support | |
| 2622 | |
| 2623 // the low-level signal-based suspend/resume support is a remnant from the | |
| 2624 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
| 2625 // within hotspot. Now there is a single use-case for this: | |
| 2626 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
| 2627 // that runs in the watcher thread. | |
| 2628 // The remaining code is greatly simplified from the more general suspension | |
| 2629 // code that used to be used. | |
| 2630 // | |
| 2631 // The protocol is quite simple: | |
| 2632 // - suspend: | |
| 2633 // - sends a signal to the target thread | |
| 2634 // - polls the suspend state of the osthread using a yield loop | |
| 2635 // - target thread signal handler (SR_handler) sets suspend state | |
| 2636 // and blocks in sigsuspend until continued | |
| 2637 // - resume: | |
| 2638 // - sets target osthread state to continue | |
| 2639 // - sends signal to end the sigsuspend loop in the SR_handler | |
| 2640 // | |
| 2641 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
| 2642 // | |
| 2643 | |
| 2644 static void resume_clear_context(OSThread *osthread) { | |
| 2645 osthread->set_ucontext(NULL); | |
| 2646 osthread->set_siginfo(NULL); | |
| 2647 | |
| 2648 // notify the suspend action is completed, we have now resumed | |
| 2649 osthread->sr.clear_suspended(); | |
| 2650 } | |
| 2651 | |
| 2652 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
| 2653 osthread->set_ucontext(context); | |
| 2654 osthread->set_siginfo(siginfo); | |
| 2655 } | |
| 2656 | |
| 2657 // | |
| 2658 // Handler function invoked when a thread's execution is suspended or | |
| 2659 // resumed. We have to be careful that only async-safe functions are | |
| 2660 // called here (Note: most pthread functions are not async safe and | |
| 2661 // should be avoided.) | |
| 2662 // | |
| 2663 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
| 2664 // interface point of view, but sigwait() prevents the signal hander | |
| 2665 // from being run. libpthread would get very confused by not having | |
| 2666 // its signal handlers run and prevents sigwait()'s use with the | |
| 2667 // mutex granting granting signal. | |
| 2668 // | |
| 2669 // Currently only ever called on the VMThread | |
| 2670 // | |
| 2671 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
| 2672 // Save and restore errno to avoid confusing native code with EINTR | |
| 2673 // after sigsuspend. | |
| 2674 int old_errno = errno; | |
| 2675 | |
| 2676 Thread* thread = Thread::current(); | |
| 2677 OSThread* osthread = thread->osthread(); | |
| 2678 assert(thread->is_VM_thread(), "Must be VMThread"); | |
| 2679 // read current suspend action | |
| 2680 int action = osthread->sr.suspend_action(); | |
| 2681 if (action == SR_SUSPEND) { | |
| 2682 suspend_save_context(osthread, siginfo, context); | |
| 2683 | |
| 2684 // Notify the suspend action is about to be completed. do_suspend() | |
| 2685 // waits until SR_SUSPENDED is set and then returns. We will wait | |
| 2686 // here for a resume signal and that completes the suspend-other | |
| 2687 // action. do_suspend/do_resume is always called as a pair from | |
| 2688 // the same thread - so there are no races | |
| 2689 | |
| 2690 // notify the caller | |
| 2691 osthread->sr.set_suspended(); | |
| 2692 | |
| 2693 sigset_t suspend_set; // signals for sigsuspend() | |
| 2694 | |
| 2695 // get current set of blocked signals and unblock resume signal | |
| 2696 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
| 2697 sigdelset(&suspend_set, SR_signum); | |
| 2698 | |
| 2699 // wait here until we are resumed | |
| 2700 do { | |
| 2701 sigsuspend(&suspend_set); | |
| 2702 // ignore all returns until we get a resume signal | |
| 2703 } while (osthread->sr.suspend_action() != SR_CONTINUE); | |
| 2704 | |
| 2705 resume_clear_context(osthread); | |
| 2706 | |
| 2707 } else { | |
| 2708 assert(action == SR_CONTINUE, "unexpected sr action"); | |
| 2709 // nothing special to do - just leave the handler | |
| 2710 } | |
| 2711 | |
| 2712 errno = old_errno; | |
| 2713 } | |
| 2714 | |
| 2715 | |
| 2716 static int SR_initialize() { | |
| 2717 struct sigaction act; | |
| 2718 char *s; | |
| 2719 /* Get signal number to use for suspend/resume */ | |
| 2720 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
| 2721 int sig = ::strtol(s, 0, 10); | |
| 2722 if (sig > 0 || sig < NSIG) { | |
| 2723 SR_signum = sig; | |
| 2724 } | |
| 2725 } | |
| 2726 | |
| 2727 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
| 2728 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
| 2729 | |
| 2730 sigemptyset(&SR_sigset); | |
| 2731 sigaddset(&SR_sigset, SR_signum); | |
| 2732 | |
| 2733 /* Set up signal handler for suspend/resume */ | |
| 2734 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 2735 act.sa_handler = (void (*)(int)) SR_handler; | |
| 2736 | |
| 2737 // SR_signum is blocked by default. | |
| 2738 // 4528190 - We also need to block pthread restart signal (32 on all | |
| 2739 // supported Bsd platforms). Note that BsdThreads need to block | |
| 2740 // this signal for all threads to work properly. So we don't have | |
| 2741 // to use hard-coded signal number when setting up the mask. | |
| 2742 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
| 2743 | |
| 2744 if (sigaction(SR_signum, &act, 0) == -1) { | |
| 2745 return -1; | |
| 2746 } | |
| 2747 | |
| 2748 // Save signal flag | |
| 2749 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
| 2750 return 0; | |
| 2751 } | |
| 2752 | |
| 2753 static int SR_finalize() { | |
| 2754 return 0; | |
| 2755 } | |
| 2756 | |
| 2757 | |
| 2758 // returns true on success and false on error - really an error is fatal | |
| 2759 // but this seems the normal response to library errors | |
| 2760 static bool do_suspend(OSThread* osthread) { | |
| 2761 // mark as suspended and send signal | |
| 2762 osthread->sr.set_suspend_action(SR_SUSPEND); | |
| 2763 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 2764 assert_status(status == 0, status, "pthread_kill"); | |
| 2765 | |
| 2766 // check status and wait until notified of suspension | |
| 2767 if (status == 0) { | |
| 2768 for (int i = 0; !osthread->sr.is_suspended(); i++) { | |
| 2769 os::yield_all(i); | |
| 2770 } | |
| 2771 osthread->sr.set_suspend_action(SR_NONE); | |
| 2772 return true; | |
| 2773 } | |
| 2774 else { | |
| 2775 osthread->sr.set_suspend_action(SR_NONE); | |
| 2776 return false; | |
| 2777 } | |
| 2778 } | |
| 2779 | |
| 2780 static void do_resume(OSThread* osthread) { | |
| 2781 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
| 2782 osthread->sr.set_suspend_action(SR_CONTINUE); | |
| 2783 | |
| 2784 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 2785 assert_status(status == 0, status, "pthread_kill"); | |
| 2786 // check status and wait unit notified of resumption | |
| 2787 if (status == 0) { | |
| 2788 for (int i = 0; osthread->sr.is_suspended(); i++) { | |
| 2789 os::yield_all(i); | |
| 2790 } | |
| 2791 } | |
| 2792 osthread->sr.set_suspend_action(SR_NONE); | |
| 2793 } | |
| 2794 | |
| 2795 //////////////////////////////////////////////////////////////////////////////// | |
| 2796 // interrupt support | |
| 2797 | |
| 2798 void os::interrupt(Thread* thread) { | |
| 2799 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2800 "possibility of dangling Thread pointer"); | |
| 2801 | |
| 2802 OSThread* osthread = thread->osthread(); | |
| 2803 | |
| 2804 if (!osthread->interrupted()) { | |
| 2805 osthread->set_interrupted(true); | |
| 2806 // More than one thread can get here with the same value of osthread, | |
| 2807 // resulting in multiple notifications. We do, however, want the store | |
| 2808 // to interrupted() to be visible to other threads before we execute unpark(). | |
| 2809 OrderAccess::fence(); | |
| 2810 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2811 if (slp != NULL) slp->unpark() ; | |
| 2812 } | |
| 2813 | |
| 2814 // For JSR166. Unpark even if interrupt status already was set | |
| 2815 if (thread->is_Java_thread()) | |
| 2816 ((JavaThread*)thread)->parker()->unpark(); | |
| 2817 | |
| 2818 ParkEvent * ev = thread->_ParkEvent ; | |
| 2819 if (ev != NULL) ev->unpark() ; | |
| 2820 | |
| 2821 } | |
| 2822 | |
| 2823 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 2824 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2825 "possibility of dangling Thread pointer"); | |
| 2826 | |
| 2827 OSThread* osthread = thread->osthread(); | |
| 2828 | |
| 2829 bool interrupted = osthread->interrupted(); | |
| 2830 | |
| 2831 if (interrupted && clear_interrupted) { | |
| 2832 osthread->set_interrupted(false); | |
| 2833 // consider thread->_SleepEvent->reset() ... optional optimization | |
| 2834 } | |
| 2835 | |
| 2836 return interrupted; | |
| 2837 } | |
| 2838 | |
| 2839 /////////////////////////////////////////////////////////////////////////////////// | |
| 2840 // signal handling (except suspend/resume) | |
| 2841 | |
| 2842 // This routine may be used by user applications as a "hook" to catch signals. | |
| 2843 // The user-defined signal handler must pass unrecognized signals to this | |
| 2844 // routine, and if it returns true (non-zero), then the signal handler must | |
| 2845 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
| 2846 // routine will never retun false (zero), but instead will execute a VM panic | |
| 2847 // routine kill the process. | |
| 2848 // | |
| 2849 // If this routine returns false, it is OK to call it again. This allows | |
| 2850 // the user-defined signal handler to perform checks either before or after | |
| 2851 // the VM performs its own checks. Naturally, the user code would be making | |
| 2852 // a serious error if it tried to handle an exception (such as a null check | |
| 2853 // or breakpoint) that the VM was generating for its own correct operation. | |
| 2854 // | |
| 2855 // This routine may recognize any of the following kinds of signals: | |
| 2856 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
| 2857 // It should be consulted by handlers for any of those signals. | |
| 2858 // | |
| 2859 // The caller of this routine must pass in the three arguments supplied | |
| 2860 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
| 2861 // field of the structure passed to sigaction(). This routine assumes that | |
| 2862 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
| 2863 // | |
| 2864 // Note that the VM will print warnings if it detects conflicting signal | |
| 2865 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
| 2866 // | |
| 2867 extern "C" JNIEXPORT int | |
| 2868 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
| 2869 void* ucontext, int abort_if_unrecognized); | |
| 2870 | |
| 2871 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
| 2872 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
| 2873 JVM_handle_bsd_signal(sig, info, uc, true); | |
| 2874 } | |
| 2875 | |
| 2876 | |
| 2877 // This boolean allows users to forward their own non-matching signals | |
| 2878 // to JVM_handle_bsd_signal, harmlessly. | |
| 2879 bool os::Bsd::signal_handlers_are_installed = false; | |
| 2880 | |
| 2881 // For signal-chaining | |
| 2882 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
| 2883 unsigned int os::Bsd::sigs = 0; | |
| 2884 bool os::Bsd::libjsig_is_loaded = false; | |
| 2885 typedef struct sigaction *(*get_signal_t)(int); | |
| 2886 get_signal_t os::Bsd::get_signal_action = NULL; | |
| 2887 | |
| 2888 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
| 2889 struct sigaction *actp = NULL; | |
| 2890 | |
| 2891 if (libjsig_is_loaded) { | |
| 2892 // Retrieve the old signal handler from libjsig | |
| 2893 actp = (*get_signal_action)(sig); | |
| 2894 } | |
| 2895 if (actp == NULL) { | |
| 2896 // Retrieve the preinstalled signal handler from jvm | |
| 2897 actp = get_preinstalled_handler(sig); | |
| 2898 } | |
| 2899 | |
| 2900 return actp; | |
| 2901 } | |
| 2902 | |
| 2903 static bool call_chained_handler(struct sigaction *actp, int sig, | |
| 2904 siginfo_t *siginfo, void *context) { | |
| 2905 // Call the old signal handler | |
| 2906 if (actp->sa_handler == SIG_DFL) { | |
| 2907 // It's more reasonable to let jvm treat it as an unexpected exception | |
| 2908 // instead of taking the default action. | |
| 2909 return false; | |
| 2910 } else if (actp->sa_handler != SIG_IGN) { | |
| 2911 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
| 2912 // automaticlly block the signal | |
| 2913 sigaddset(&(actp->sa_mask), sig); | |
| 2914 } | |
| 2915 | |
| 2916 sa_handler_t hand; | |
| 2917 sa_sigaction_t sa; | |
| 2918 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
| 2919 // retrieve the chained handler | |
| 2920 if (siginfo_flag_set) { | |
| 2921 sa = actp->sa_sigaction; | |
| 2922 } else { | |
| 2923 hand = actp->sa_handler; | |
| 2924 } | |
| 2925 | |
| 2926 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
| 2927 actp->sa_handler = SIG_DFL; | |
| 2928 } | |
| 2929 | |
| 2930 // try to honor the signal mask | |
| 2931 sigset_t oset; | |
| 2932 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
| 2933 | |
| 2934 // call into the chained handler | |
| 2935 if (siginfo_flag_set) { | |
| 2936 (*sa)(sig, siginfo, context); | |
| 2937 } else { | |
| 2938 (*hand)(sig); | |
| 2939 } | |
| 2940 | |
| 2941 // restore the signal mask | |
| 2942 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
| 2943 } | |
| 2944 // Tell jvm's signal handler the signal is taken care of. | |
| 2945 return true; | |
| 2946 } | |
| 2947 | |
| 2948 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
| 2949 bool chained = false; | |
| 2950 // signal-chaining | |
| 2951 if (UseSignalChaining) { | |
| 2952 struct sigaction *actp = get_chained_signal_action(sig); | |
| 2953 if (actp != NULL) { | |
| 2954 chained = call_chained_handler(actp, sig, siginfo, context); | |
| 2955 } | |
| 2956 } | |
| 2957 return chained; | |
| 2958 } | |
| 2959 | |
| 2960 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
| 2961 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
| 2962 return &sigact[sig]; | |
| 2963 } | |
| 2964 return NULL; | |
| 2965 } | |
| 2966 | |
| 2967 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
| 2968 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 2969 sigact[sig] = oldAct; | |
| 2970 sigs |= (unsigned int)1 << sig; | |
| 2971 } | |
| 2972 | |
| 2973 // for diagnostic | |
| 2974 int os::Bsd::sigflags[MAXSIGNUM]; | |
| 2975 | |
| 2976 int os::Bsd::get_our_sigflags(int sig) { | |
| 2977 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 2978 return sigflags[sig]; | |
| 2979 } | |
| 2980 | |
| 2981 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
| 2982 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 2983 sigflags[sig] = flags; | |
| 2984 } | |
| 2985 | |
| 2986 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
| 2987 // Check for overwrite. | |
| 2988 struct sigaction oldAct; | |
| 2989 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
| 2990 | |
| 2991 void* oldhand = oldAct.sa_sigaction | |
| 2992 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 2993 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 2994 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
| 2995 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
| 2996 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
| 2997 if (AllowUserSignalHandlers || !set_installed) { | |
| 2998 // Do not overwrite; user takes responsibility to forward to us. | |
| 2999 return; | |
| 3000 } else if (UseSignalChaining) { | |
| 3001 // save the old handler in jvm | |
| 3002 save_preinstalled_handler(sig, oldAct); | |
| 3003 // libjsig also interposes the sigaction() call below and saves the | |
| 3004 // old sigaction on it own. | |
| 3005 } else { | |
| 3006 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
| 3007 "%#lx for signal %d.", (long)oldhand, sig)); | |
| 3008 } | |
| 3009 } | |
| 3010 | |
| 3011 struct sigaction sigAct; | |
| 3012 sigfillset(&(sigAct.sa_mask)); | |
| 3013 sigAct.sa_handler = SIG_DFL; | |
| 3014 if (!set_installed) { | |
| 3015 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3016 } else { | |
| 3017 sigAct.sa_sigaction = signalHandler; | |
| 3018 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3019 } | |
| 3020 // Save flags, which are set by ours | |
| 3021 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3022 sigflags[sig] = sigAct.sa_flags; | |
| 3023 | |
| 3024 int ret = sigaction(sig, &sigAct, &oldAct); | |
| 3025 assert(ret == 0, "check"); | |
| 3026 | |
| 3027 void* oldhand2 = oldAct.sa_sigaction | |
| 3028 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 3029 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 3030 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
| 3031 } | |
| 3032 | |
| 3033 // install signal handlers for signals that HotSpot needs to | |
| 3034 // handle in order to support Java-level exception handling. | |
| 3035 | |
| 3036 void os::Bsd::install_signal_handlers() { | |
| 3037 if (!signal_handlers_are_installed) { | |
| 3038 signal_handlers_are_installed = true; | |
| 3039 | |
| 3040 // signal-chaining | |
| 3041 typedef void (*signal_setting_t)(); | |
| 3042 signal_setting_t begin_signal_setting = NULL; | |
| 3043 signal_setting_t end_signal_setting = NULL; | |
| 3044 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3045 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
| 3046 if (begin_signal_setting != NULL) { | |
| 3047 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3048 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
| 3049 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
| 3050 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
| 3051 libjsig_is_loaded = true; | |
| 3052 assert(UseSignalChaining, "should enable signal-chaining"); | |
| 3053 } | |
| 3054 if (libjsig_is_loaded) { | |
| 3055 // Tell libjsig jvm is setting signal handlers | |
| 3056 (*begin_signal_setting)(); | |
| 3057 } | |
| 3058 | |
| 3059 set_signal_handler(SIGSEGV, true); | |
| 3060 set_signal_handler(SIGPIPE, true); | |
| 3061 set_signal_handler(SIGBUS, true); | |
| 3062 set_signal_handler(SIGILL, true); | |
| 3063 set_signal_handler(SIGFPE, true); | |
| 3064 set_signal_handler(SIGXFSZ, true); | |
| 3065 | |
| 3066 #if defined(__APPLE__) | |
| 3067 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
| 3068 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
| 3069 // signal handler that's placed on our process by CrashReporter. This disables | |
| 3070 // CrashReporter-based reporting. | |
| 3071 // | |
| 3072 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
| 3073 // on caught fatal signals. | |
| 3074 // | |
| 3075 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
| 3076 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
| 3077 // exception handling, while leaving the standard BSD signal handlers functional. | |
| 3078 kern_return_t kr; | |
| 3079 kr = task_set_exception_ports(mach_task_self(), | |
| 3080 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
| 3081 MACH_PORT_NULL, | |
| 3082 EXCEPTION_STATE_IDENTITY, | |
| 3083 MACHINE_THREAD_STATE); | |
| 3084 | |
| 3085 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
| 3086 #endif | |
| 3087 | |
| 3088 if (libjsig_is_loaded) { | |
| 3089 // Tell libjsig jvm finishes setting signal handlers | |
| 3090 (*end_signal_setting)(); | |
| 3091 } | |
| 3092 | |
| 3093 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
| 3094 // and if UserSignalHandler is installed all bets are off | |
| 3095 if (CheckJNICalls) { | |
| 3096 if (libjsig_is_loaded) { | |
| 3097 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
| 3098 check_signals = false; | |
| 3099 } | |
| 3100 if (AllowUserSignalHandlers) { | |
| 3101 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
| 3102 check_signals = false; | |
| 3103 } | |
| 3104 } | |
| 3105 } | |
| 3106 } | |
| 3107 | |
| 3108 | |
| 3109 ///// | |
| 3110 // glibc on Bsd platform uses non-documented flag | |
| 3111 // to indicate, that some special sort of signal | |
| 3112 // trampoline is used. | |
| 3113 // We will never set this flag, and we should | |
| 3114 // ignore this flag in our diagnostic | |
| 3115 #ifdef SIGNIFICANT_SIGNAL_MASK | |
| 3116 #undef SIGNIFICANT_SIGNAL_MASK | |
| 3117 #endif | |
| 3118 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
| 3119 | |
| 3120 static const char* get_signal_handler_name(address handler, | |
| 3121 char* buf, int buflen) { | |
| 3122 int offset; | |
| 3123 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
| 3124 if (found) { | |
| 3125 // skip directory names | |
| 3126 const char *p1, *p2; | |
| 3127 p1 = buf; | |
| 3128 size_t len = strlen(os::file_separator()); | |
| 3129 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
| 3130 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
| 3131 } else { | |
| 3132 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
| 3133 } | |
| 3134 return buf; | |
| 3135 } | |
| 3136 | |
| 3137 static void print_signal_handler(outputStream* st, int sig, | |
| 3138 char* buf, size_t buflen) { | |
| 3139 struct sigaction sa; | |
| 3140 | |
| 3141 sigaction(sig, NULL, &sa); | |
| 3142 | |
| 3143 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
| 3144 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3145 | |
| 3146 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
| 3147 | |
| 3148 address handler = (sa.sa_flags & SA_SIGINFO) | |
| 3149 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 3150 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 3151 | |
| 3152 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
| 3153 st->print("SIG_DFL"); | |
| 3154 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
| 3155 st->print("SIG_IGN"); | |
| 3156 } else { | |
| 3157 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
| 3158 } | |
| 3159 | |
| 3160 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
| 3161 | |
| 3162 address rh = VMError::get_resetted_sighandler(sig); | |
| 3163 // May be, handler was resetted by VMError? | |
| 3164 if(rh != NULL) { | |
| 3165 handler = rh; | |
| 3166 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
| 3167 } | |
| 3168 | |
| 3169 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
| 3170 | |
| 3171 // Check: is it our handler? | |
| 3172 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
| 3173 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
| 3174 // It is our signal handler | |
| 3175 // check for flags, reset system-used one! | |
| 3176 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3177 st->print( | |
| 3178 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
| 3179 os::Bsd::get_our_sigflags(sig)); | |
| 3180 } | |
| 3181 } | |
| 3182 st->cr(); | |
| 3183 } | |
| 3184 | |
| 3185 | |
| 3186 #define DO_SIGNAL_CHECK(sig) \ | |
| 3187 if (!sigismember(&check_signal_done, sig)) \ | |
| 3188 os::Bsd::check_signal_handler(sig) | |
| 3189 | |
| 3190 // This method is a periodic task to check for misbehaving JNI applications | |
| 3191 // under CheckJNI, we can add any periodic checks here | |
| 3192 | |
| 3193 void os::run_periodic_checks() { | |
| 3194 | |
| 3195 if (check_signals == false) return; | |
| 3196 | |
| 3197 // SEGV and BUS if overridden could potentially prevent | |
| 3198 // generation of hs*.log in the event of a crash, debugging | |
| 3199 // such a case can be very challenging, so we absolutely | |
| 3200 // check the following for a good measure: | |
| 3201 DO_SIGNAL_CHECK(SIGSEGV); | |
| 3202 DO_SIGNAL_CHECK(SIGILL); | |
| 3203 DO_SIGNAL_CHECK(SIGFPE); | |
| 3204 DO_SIGNAL_CHECK(SIGBUS); | |
| 3205 DO_SIGNAL_CHECK(SIGPIPE); | |
| 3206 DO_SIGNAL_CHECK(SIGXFSZ); | |
| 3207 | |
| 3208 | |
| 3209 // ReduceSignalUsage allows the user to override these handlers | |
| 3210 // see comments at the very top and jvm_solaris.h | |
| 3211 if (!ReduceSignalUsage) { | |
| 3212 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
| 3213 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
| 3214 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
| 3215 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
| 3216 } | |
| 3217 | |
| 3218 DO_SIGNAL_CHECK(SR_signum); | |
| 3219 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
| 3220 } | |
| 3221 | |
| 3222 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
| 3223 | |
| 3224 static os_sigaction_t os_sigaction = NULL; | |
| 3225 | |
| 3226 void os::Bsd::check_signal_handler(int sig) { | |
| 3227 char buf[O_BUFLEN]; | |
| 3228 address jvmHandler = NULL; | |
| 3229 | |
| 3230 | |
| 3231 struct sigaction act; | |
| 3232 if (os_sigaction == NULL) { | |
| 3233 // only trust the default sigaction, in case it has been interposed | |
| 3234 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
| 3235 if (os_sigaction == NULL) return; | |
| 3236 } | |
| 3237 | |
| 3238 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
| 3239 | |
| 3240 | |
| 3241 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3242 | |
| 3243 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
| 3244 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
| 3245 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
| 3246 | |
| 3247 | |
| 3248 switch(sig) { | |
| 3249 case SIGSEGV: | |
| 3250 case SIGBUS: | |
| 3251 case SIGFPE: | |
| 3252 case SIGPIPE: | |
| 3253 case SIGILL: | |
| 3254 case SIGXFSZ: | |
| 3255 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
| 3256 break; | |
| 3257 | |
| 3258 case SHUTDOWN1_SIGNAL: | |
| 3259 case SHUTDOWN2_SIGNAL: | |
| 3260 case SHUTDOWN3_SIGNAL: | |
| 3261 case BREAK_SIGNAL: | |
| 3262 jvmHandler = (address)user_handler(); | |
| 3263 break; | |
| 3264 | |
| 3265 case INTERRUPT_SIGNAL: | |
| 3266 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
| 3267 break; | |
| 3268 | |
| 3269 default: | |
| 3270 if (sig == SR_signum) { | |
| 3271 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
| 3272 } else { | |
| 3273 return; | |
| 3274 } | |
| 3275 break; | |
| 3276 } | |
| 3277 | |
| 3278 if (thisHandler != jvmHandler) { | |
| 3279 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
| 3280 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
| 3281 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
| 3282 // No need to check this sig any longer | |
| 3283 sigaddset(&check_signal_done, sig); | |
| 3284 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3285 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
| 3286 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
| 3287 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
| 3288 // No need to check this sig any longer | |
| 3289 sigaddset(&check_signal_done, sig); | |
| 3290 } | |
| 3291 | |
| 3292 // Dump all the signal | |
| 3293 if (sigismember(&check_signal_done, sig)) { | |
| 3294 print_signal_handlers(tty, buf, O_BUFLEN); | |
| 3295 } | |
| 3296 } | |
| 3297 | |
| 3298 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
| 3299 | |
| 3300 extern bool signal_name(int signo, char* buf, size_t len); | |
| 3301 | |
| 3302 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
| 3303 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
| 3304 // signal | |
| 3305 if (!signal_name(exception_code, buf, size)) { | |
| 3306 jio_snprintf(buf, size, "SIG%d", exception_code); | |
| 3307 } | |
| 3308 return buf; | |
| 3309 } else { | |
| 3310 return NULL; | |
| 3311 } | |
| 3312 } | |
| 3313 | |
| 3314 // this is called _before_ the most of global arguments have been parsed | |
| 3315 void os::init(void) { | |
| 3316 char dummy; /* used to get a guess on initial stack address */ | |
| 3317 // first_hrtime = gethrtime(); | |
| 3318 | |
| 3319 // With BsdThreads the JavaMain thread pid (primordial thread) | |
| 3320 // is different than the pid of the java launcher thread. | |
| 3321 // So, on Bsd, the launcher thread pid is passed to the VM | |
| 3322 // via the sun.java.launcher.pid property. | |
| 3323 // Use this property instead of getpid() if it was correctly passed. | |
| 3324 // See bug 6351349. | |
| 3325 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
| 3326 | |
| 3327 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
| 3328 | |
| 3329 clock_tics_per_sec = CLK_TCK; | |
| 3330 | |
| 3331 init_random(1234567); | |
| 3332 | |
| 3333 ThreadCritical::initialize(); | |
| 3334 | |
| 3335 Bsd::set_page_size(getpagesize()); | |
| 3336 if (Bsd::page_size() == -1) { | |
| 3337 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
| 3338 strerror(errno))); | |
| 3339 } | |
| 3340 init_page_sizes((size_t) Bsd::page_size()); | |
| 3341 | |
| 3342 Bsd::initialize_system_info(); | |
| 3343 | |
| 3344 // main_thread points to the aboriginal thread | |
| 3345 Bsd::_main_thread = pthread_self(); | |
| 3346 | |
| 3347 Bsd::clock_init(); | |
| 3348 initial_time_count = os::elapsed_counter(); | |
| 3349 | |
| 3350 #ifdef __APPLE__ | |
| 3351 // XXXDARWIN | |
| 3352 // Work around the unaligned VM callbacks in hotspot's | |
| 3353 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
| 3354 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
| 3355 // alignment when doing symbol lookup. To work around this, we force early | |
| 3356 // binding of all symbols now, thus binding when alignment is known-good. | |
| 3357 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
| 3358 #endif | |
| 3359 } | |
| 3360 | |
| 3361 // To install functions for atexit system call | |
| 3362 extern "C" { | |
| 3363 static void perfMemory_exit_helper() { | |
| 3364 perfMemory_exit(); | |
| 3365 } | |
| 3366 } | |
| 3367 | |
| 3368 // this is called _after_ the global arguments have been parsed | |
| 3369 jint os::init_2(void) | |
| 3370 { | |
| 3371 // Allocate a single page and mark it as readable for safepoint polling | |
| 3372 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 3373 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
| 3374 | |
| 3375 os::set_polling_page( polling_page ); | |
| 3376 | |
| 3377 #ifndef PRODUCT | |
| 3378 if(Verbose && PrintMiscellaneous) | |
| 3379 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 3380 #endif | |
| 3381 | |
| 3382 if (!UseMembar) { | |
| 3383 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 3384 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
| 3385 os::set_memory_serialize_page( mem_serialize_page ); | |
| 3386 | |
| 3387 #ifndef PRODUCT | |
| 3388 if(Verbose && PrintMiscellaneous) | |
| 3389 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 3390 #endif | |
| 3391 } | |
| 3392 | |
| 3393 os::large_page_init(); | |
| 3394 | |
| 3395 // initialize suspend/resume support - must do this before signal_sets_init() | |
| 3396 if (SR_initialize() != 0) { | |
| 3397 perror("SR_initialize failed"); | |
| 3398 return JNI_ERR; | |
| 3399 } | |
| 3400 | |
| 3401 Bsd::signal_sets_init(); | |
| 3402 Bsd::install_signal_handlers(); | |
| 3403 | |
| 3404 // Check minimum allowable stack size for thread creation and to initialize | |
| 3405 // the java system classes, including StackOverflowError - depends on page | |
| 3406 // size. Add a page for compiler2 recursion in main thread. | |
| 3407 // Add in 2*BytesPerWord times page size to account for VM stack during | |
| 3408 // class initialization depending on 32 or 64 bit VM. | |
| 3409 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
| 3410 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
| 3411 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
| 3412 | |
| 3413 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
| 3414 if (threadStackSizeInBytes != 0 && | |
| 3415 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
| 3416 tty->print_cr("\nThe stack size specified is too small, " | |
| 3417 "Specify at least %dk", | |
| 3418 os::Bsd::min_stack_allowed/ K); | |
| 3419 return JNI_ERR; | |
| 3420 } | |
| 3421 | |
| 3422 // Make the stack size a multiple of the page size so that | |
| 3423 // the yellow/red zones can be guarded. | |
| 3424 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
| 3425 vm_page_size())); | |
| 3426 | |
| 3427 if (MaxFDLimit) { | |
| 3428 // set the number of file descriptors to max. print out error | |
| 3429 // if getrlimit/setrlimit fails but continue regardless. | |
| 3430 struct rlimit nbr_files; | |
| 3431 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3432 if (status != 0) { | |
| 3433 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3434 perror("os::init_2 getrlimit failed"); | |
| 3435 } else { | |
| 3436 nbr_files.rlim_cur = nbr_files.rlim_max; | |
| 3437 | |
| 3438 #ifdef __APPLE__ | |
| 3439 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
| 3440 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
| 3441 // be used instead | |
| 3442 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
| 3443 #endif | |
| 3444 | |
| 3445 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3446 if (status != 0) { | |
| 3447 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3448 perror("os::init_2 setrlimit failed"); | |
| 3449 } | |
| 3450 } | |
| 3451 } | |
| 3452 | |
| 3453 // at-exit methods are called in the reverse order of their registration. | |
| 3454 // atexit functions are called on return from main or as a result of a | |
| 3455 // call to exit(3C). There can be only 32 of these functions registered | |
| 3456 // and atexit() does not set errno. | |
| 3457 | |
| 3458 if (PerfAllowAtExitRegistration) { | |
| 3459 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 3460 // atexit functions can be delayed until process exit time, which | |
| 3461 // can be problematic for embedded VM situations. Embedded VMs should | |
| 3462 // call DestroyJavaVM() to assure that VM resources are released. | |
| 3463 | |
| 3464 // note: perfMemory_exit_helper atexit function may be removed in | |
| 3465 // the future if the appropriate cleanup code can be added to the | |
| 3466 // VM_Exit VMOperation's doit method. | |
| 3467 if (atexit(perfMemory_exit_helper) != 0) { | |
| 3468 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
| 3469 } | |
| 3470 } | |
| 3471 | |
| 3472 // initialize thread priority policy | |
| 3473 prio_init(); | |
| 3474 | |
| 4006 | 3475 #ifdef __APPLE__ |
| 3476 // dynamically link to objective c gc registration | |
| 3477 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
| 3478 if (handleLibObjc != NULL) { | |
| 3479 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
| 3480 } | |
| 3481 #endif | |
| 3482 | |
| 3960 | 3483 return JNI_OK; |
| 3484 } | |
| 3485 | |
| 3486 // this is called at the end of vm_initialization | |
| 3487 void os::init_3(void) { } | |
| 3488 | |
| 3489 // Mark the polling page as unreadable | |
| 3490 void os::make_polling_page_unreadable(void) { | |
| 3491 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
| 3492 fatal("Could not disable polling page"); | |
| 3493 }; | |
| 3494 | |
| 3495 // Mark the polling page as readable | |
| 3496 void os::make_polling_page_readable(void) { | |
| 3497 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
| 3498 fatal("Could not enable polling page"); | |
| 3499 } | |
| 3500 }; | |
| 3501 | |
| 3502 int os::active_processor_count() { | |
| 3503 return _processor_count; | |
| 3504 } | |
| 3505 | |
| 4006 | 3506 void os::set_native_thread_name(const char *name) { |
| 3507 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
| 3508 // This is only supported in Snow Leopard and beyond | |
| 3509 if (name != NULL) { | |
| 3510 // Add a "Java: " prefix to the name | |
| 3511 char buf[MAXTHREADNAMESIZE]; | |
| 3512 snprintf(buf, sizeof(buf), "Java: %s", name); | |
| 3513 pthread_setname_np(buf); | |
| 3514 } | |
| 3515 #endif | |
| 3516 } | |
| 3517 | |
| 3960 | 3518 bool os::distribute_processes(uint length, uint* distribution) { |
| 3519 // Not yet implemented. | |
| 3520 return false; | |
| 3521 } | |
| 3522 | |
| 3523 bool os::bind_to_processor(uint processor_id) { | |
| 3524 // Not yet implemented. | |
| 3525 return false; | |
| 3526 } | |
| 3527 | |
| 3528 /// | |
| 3529 | |
| 3530 // Suspends the target using the signal mechanism and then grabs the PC before | |
| 3531 // resuming the target. Used by the flat-profiler only | |
| 3532 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 3533 // Make sure that it is called by the watcher for the VMThread | |
| 3534 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
| 3535 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
| 3536 | |
| 3537 ExtendedPC epc; | |
| 3538 | |
| 3539 OSThread* osthread = thread->osthread(); | |
| 3540 if (do_suspend(osthread)) { | |
| 3541 if (osthread->ucontext() != NULL) { | |
| 3542 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); | |
| 3543 } else { | |
| 3544 // NULL context is unexpected, double-check this is the VMThread | |
| 3545 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
| 3546 } | |
| 3547 do_resume(osthread); | |
| 3548 } | |
| 3549 // failure means pthread_kill failed for some reason - arguably this is | |
| 3550 // a fatal problem, but such problems are ignored elsewhere | |
| 3551 | |
| 3552 return epc; | |
| 3553 } | |
| 3554 | |
| 3555 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
| 3556 { | |
| 3557 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 3558 } | |
| 3559 | |
| 3560 //////////////////////////////////////////////////////////////////////////////// | |
| 3561 // debug support | |
| 3562 | |
| 3563 static address same_page(address x, address y) { | |
| 3564 int page_bits = -os::vm_page_size(); | |
| 3565 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) | |
| 3566 return x; | |
| 3567 else if (x > y) | |
| 3568 return (address)(intptr_t(y) | ~page_bits) + 1; | |
| 3569 else | |
| 3570 return (address)(intptr_t(y) & page_bits); | |
| 3571 } | |
| 3572 | |
| 3573 bool os::find(address addr, outputStream* st) { | |
| 3574 Dl_info dlinfo; | |
| 3575 memset(&dlinfo, 0, sizeof(dlinfo)); | |
| 3576 if (dladdr(addr, &dlinfo)) { | |
| 3577 st->print(PTR_FORMAT ": ", addr); | |
| 3578 if (dlinfo.dli_sname != NULL) { | |
| 3579 st->print("%s+%#x", dlinfo.dli_sname, | |
| 3580 addr - (intptr_t)dlinfo.dli_saddr); | |
| 3581 } else if (dlinfo.dli_fname) { | |
| 3582 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); | |
| 3583 } else { | |
| 3584 st->print("<absolute address>"); | |
| 3585 } | |
| 3586 if (dlinfo.dli_fname) { | |
| 3587 st->print(" in %s", dlinfo.dli_fname); | |
| 3588 } | |
| 3589 if (dlinfo.dli_fbase) { | |
| 3590 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); | |
| 3591 } | |
| 3592 st->cr(); | |
| 3593 | |
| 3594 if (Verbose) { | |
| 3595 // decode some bytes around the PC | |
| 3596 address begin = same_page(addr-40, addr); | |
| 3597 address end = same_page(addr+40, addr); | |
| 3598 address lowest = (address) dlinfo.dli_sname; | |
| 3599 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
| 3600 if (begin < lowest) begin = lowest; | |
| 3601 Dl_info dlinfo2; | |
| 3602 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
| 3603 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
| 3604 end = (address) dlinfo2.dli_saddr; | |
| 3605 Disassembler::decode(begin, end, st); | |
| 3606 } | |
| 3607 return true; | |
| 3608 } | |
| 3609 return false; | |
| 3610 } | |
| 3611 | |
| 3612 //////////////////////////////////////////////////////////////////////////////// | |
| 3613 // misc | |
| 3614 | |
| 3615 // This does not do anything on Bsd. This is basically a hook for being | |
| 3616 // able to use structured exception handling (thread-local exception filters) | |
| 3617 // on, e.g., Win32. | |
| 3618 void | |
| 3619 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
| 3620 JavaCallArguments* args, Thread* thread) { | |
| 3621 f(value, method, args, thread); | |
| 3622 } | |
| 3623 | |
| 3624 void os::print_statistics() { | |
| 3625 } | |
| 3626 | |
| 3627 int os::message_box(const char* title, const char* message) { | |
| 3628 int i; | |
| 3629 fdStream err(defaultStream::error_fd()); | |
| 3630 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3631 err.cr(); | |
| 3632 err.print_raw_cr(title); | |
| 3633 for (i = 0; i < 78; i++) err.print_raw("-"); | |
| 3634 err.cr(); | |
| 3635 err.print_raw_cr(message); | |
| 3636 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3637 err.cr(); | |
| 3638 | |
| 3639 char buf[16]; | |
| 3640 // Prevent process from exiting upon "read error" without consuming all CPU | |
| 3641 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
| 3642 | |
| 3643 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 3644 } | |
| 3645 | |
| 3646 int os::stat(const char *path, struct stat *sbuf) { | |
| 3647 char pathbuf[MAX_PATH]; | |
| 3648 if (strlen(path) > MAX_PATH - 1) { | |
| 3649 errno = ENAMETOOLONG; | |
| 3650 return -1; | |
| 3651 } | |
| 3652 os::native_path(strcpy(pathbuf, path)); | |
| 3653 return ::stat(pathbuf, sbuf); | |
| 3654 } | |
| 3655 | |
| 3656 bool os::check_heap(bool force) { | |
| 3657 return true; | |
| 3658 } | |
| 3659 | |
| 3660 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
| 3661 return ::vsnprintf(buf, count, format, args); | |
| 3662 } | |
| 3663 | |
| 3664 // Is a (classpath) directory empty? | |
| 3665 bool os::dir_is_empty(const char* path) { | |
| 3666 DIR *dir = NULL; | |
| 3667 struct dirent *ptr; | |
| 3668 | |
| 3669 dir = opendir(path); | |
| 3670 if (dir == NULL) return true; | |
| 3671 | |
| 3672 /* Scan the directory */ | |
| 3673 bool result = true; | |
| 3674 char buf[sizeof(struct dirent) + MAX_PATH]; | |
| 3675 while (result && (ptr = ::readdir(dir)) != NULL) { | |
| 3676 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
| 3677 result = false; | |
| 3678 } | |
| 3679 } | |
| 3680 closedir(dir); | |
| 3681 return result; | |
| 3682 } | |
| 3683 | |
| 3684 // This code originates from JDK's sysOpen and open64_w | |
| 3685 // from src/solaris/hpi/src/system_md.c | |
| 3686 | |
| 3687 #ifndef O_DELETE | |
| 3688 #define O_DELETE 0x10000 | |
| 3689 #endif | |
| 3690 | |
| 3691 // Open a file. Unlink the file immediately after open returns | |
| 3692 // if the specified oflag has the O_DELETE flag set. | |
| 3693 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
| 3694 | |
| 3695 int os::open(const char *path, int oflag, int mode) { | |
| 3696 | |
| 3697 if (strlen(path) > MAX_PATH - 1) { | |
| 3698 errno = ENAMETOOLONG; | |
| 3699 return -1; | |
| 3700 } | |
| 3701 int fd; | |
| 3702 int o_delete = (oflag & O_DELETE); | |
| 3703 oflag = oflag & ~O_DELETE; | |
| 3704 | |
| 3705 fd = ::open(path, oflag, mode); | |
| 3706 if (fd == -1) return -1; | |
| 3707 | |
| 3708 //If the open succeeded, the file might still be a directory | |
| 3709 { | |
| 3710 struct stat buf; | |
| 3711 int ret = ::fstat(fd, &buf); | |
| 3712 int st_mode = buf.st_mode; | |
| 3713 | |
| 3714 if (ret != -1) { | |
| 3715 if ((st_mode & S_IFMT) == S_IFDIR) { | |
| 3716 errno = EISDIR; | |
| 3717 ::close(fd); | |
| 3718 return -1; | |
| 3719 } | |
| 3720 } else { | |
| 3721 ::close(fd); | |
| 3722 return -1; | |
| 3723 } | |
| 3724 } | |
| 3725 | |
| 3726 /* | |
| 3727 * All file descriptors that are opened in the JVM and not | |
| 3728 * specifically destined for a subprocess should have the | |
| 3729 * close-on-exec flag set. If we don't set it, then careless 3rd | |
| 3730 * party native code might fork and exec without closing all | |
| 3731 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
| 3732 * UNIXProcess.c), and this in turn might: | |
| 3733 * | |
| 3734 * - cause end-of-file to fail to be detected on some file | |
| 3735 * descriptors, resulting in mysterious hangs, or | |
| 3736 * | |
| 3737 * - might cause an fopen in the subprocess to fail on a system | |
| 3738 * suffering from bug 1085341. | |
| 3739 * | |
| 3740 * (Yes, the default setting of the close-on-exec flag is a Unix | |
| 3741 * design flaw) | |
| 3742 * | |
| 3743 * See: | |
| 3744 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
| 3745 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
| 3746 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
| 3747 */ | |
| 3748 #ifdef FD_CLOEXEC | |
| 3749 { | |
| 3750 int flags = ::fcntl(fd, F_GETFD); | |
| 3751 if (flags != -1) | |
| 3752 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
| 3753 } | |
| 3754 #endif | |
| 3755 | |
| 3756 if (o_delete != 0) { | |
| 3757 ::unlink(path); | |
| 3758 } | |
| 3759 return fd; | |
| 3760 } | |
| 3761 | |
| 3762 | |
| 3763 // create binary file, rewriting existing file if required | |
| 3764 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 3765 int oflags = O_WRONLY | O_CREAT; | |
| 3766 if (!rewrite_existing) { | |
| 3767 oflags |= O_EXCL; | |
| 3768 } | |
| 3769 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
| 3770 } | |
| 3771 | |
| 3772 // return current position of file pointer | |
| 3773 jlong os::current_file_offset(int fd) { | |
| 3774 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
| 3775 } | |
| 3776 | |
| 3777 // move file pointer to the specified offset | |
| 3778 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 3779 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
| 3780 } | |
| 3781 | |
| 3782 // This code originates from JDK's sysAvailable | |
| 3783 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
| 3784 | |
| 3785 int os::available(int fd, jlong *bytes) { | |
| 3786 jlong cur, end; | |
| 3787 int mode; | |
| 3788 struct stat buf; | |
| 3789 | |
| 3790 if (::fstat(fd, &buf) >= 0) { | |
| 3791 mode = buf.st_mode; | |
| 3792 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
| 3793 /* | |
| 3794 * XXX: is the following call interruptible? If so, this might | |
| 3795 * need to go through the INTERRUPT_IO() wrapper as for other | |
| 3796 * blocking, interruptible calls in this file. | |
| 3797 */ | |
| 3798 int n; | |
| 3799 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
| 3800 *bytes = n; | |
| 3801 return 1; | |
| 3802 } | |
| 3803 } | |
| 3804 } | |
| 3805 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
| 3806 return 0; | |
| 3807 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
| 3808 return 0; | |
| 3809 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
| 3810 return 0; | |
| 3811 } | |
| 3812 *bytes = end - cur; | |
| 3813 return 1; | |
| 3814 } | |
| 3815 | |
| 3816 int os::socket_available(int fd, jint *pbytes) { | |
| 3817 if (fd < 0) | |
| 3818 return OS_OK; | |
| 3819 | |
| 3820 int ret; | |
| 3821 | |
| 3822 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
| 3823 | |
| 3824 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
| 3825 // is expected to return 0 on failure and 1 on success to the jdk. | |
| 3826 | |
| 3827 return (ret == OS_ERR) ? 0 : 1; | |
| 3828 } | |
| 3829 | |
| 3830 // Map a block of memory. | |
| 6197 | 3831 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 3832 char *addr, size_t bytes, bool read_only, |
| 3833 bool allow_exec) { | |
| 3834 int prot; | |
| 3835 int flags; | |
| 3836 | |
| 3837 if (read_only) { | |
| 3838 prot = PROT_READ; | |
| 3839 flags = MAP_SHARED; | |
| 3840 } else { | |
| 3841 prot = PROT_READ | PROT_WRITE; | |
| 3842 flags = MAP_PRIVATE; | |
| 3843 } | |
| 3844 | |
| 3845 if (allow_exec) { | |
| 3846 prot |= PROT_EXEC; | |
| 3847 } | |
| 3848 | |
| 3849 if (addr != NULL) { | |
| 3850 flags |= MAP_FIXED; | |
| 3851 } | |
| 3852 | |
| 3853 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
| 3854 fd, file_offset); | |
| 3855 if (mapped_address == MAP_FAILED) { | |
| 3856 return NULL; | |
| 3857 } | |
| 3858 return mapped_address; | |
| 3859 } | |
| 3860 | |
| 3861 | |
| 3862 // Remap a block of memory. | |
| 6197 | 3863 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 3864 char *addr, size_t bytes, bool read_only, |
| 3865 bool allow_exec) { | |
| 3866 // same as map_memory() on this OS | |
| 3867 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 3868 allow_exec); | |
| 3869 } | |
| 3870 | |
| 3871 | |
| 3872 // Unmap a block of memory. | |
| 6197 | 3873 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| 3960 | 3874 return munmap(addr, bytes) == 0; |
| 3875 } | |
| 3876 | |
| 3877 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 3878 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 3879 // of a thread. | |
| 3880 // | |
| 3881 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 3882 // the fast estimate available on the platform. | |
| 3883 | |
| 3884 jlong os::current_thread_cpu_time() { | |
| 3885 #ifdef __APPLE__ | |
| 3886 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
| 3887 #endif | |
| 3888 } | |
| 3889 | |
| 3890 jlong os::thread_cpu_time(Thread* thread) { | |
| 3891 } | |
| 3892 | |
| 3893 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 3894 #ifdef __APPLE__ | |
| 3895 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
| 3896 #endif | |
| 3897 } | |
| 3898 | |
| 3899 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 3900 #ifdef __APPLE__ | |
| 3901 struct thread_basic_info tinfo; | |
| 3902 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
| 3903 kern_return_t kr; | |
|
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3906 mach_thread = thread->osthread()->thread_id(); |
| 3960 | 3907 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
| 3908 if (kr != KERN_SUCCESS) | |
| 3909 return -1; | |
| 3910 | |
| 3911 if (user_sys_cpu_time) { | |
| 3912 jlong nanos; | |
| 3913 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
| 3914 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
| 3915 return nanos; | |
| 3916 } else { | |
| 3917 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
| 3918 } | |
| 3919 #endif | |
| 3920 } | |
| 3921 | |
| 3922 | |
| 3923 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 3924 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 3925 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 3926 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 3927 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 3928 } | |
| 3929 | |
| 3930 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 3931 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 3932 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 3933 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 3934 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 3935 } | |
| 3936 | |
| 3937 bool os::is_thread_cpu_time_supported() { | |
| 3938 #ifdef __APPLE__ | |
| 3939 return true; | |
| 6918 | 3940 #else |
| 3960 | 3941 return false; |
| 3942 #endif | |
| 3943 } | |
| 3944 | |
| 3945 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 3946 // Bsd doesn't yet have a (official) notion of processor sets, | |
| 3947 // so just return the system wide load average. | |
| 3948 int os::loadavg(double loadavg[], int nelem) { | |
| 3949 return ::getloadavg(loadavg, nelem); | |
| 3950 } | |
| 3951 | |
| 3952 void os::pause() { | |
| 3953 char filename[MAX_PATH]; | |
| 3954 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 3955 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 3956 } else { | |
| 3957 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 3958 } | |
| 3959 | |
| 3960 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 3961 if (fd != -1) { | |
| 3962 struct stat buf; | |
| 3963 ::close(fd); | |
| 3964 while (::stat(filename, &buf) == 0) { | |
| 3965 (void)::poll(NULL, 0, 100); | |
| 3966 } | |
| 3967 } else { | |
| 3968 jio_fprintf(stderr, | |
| 3969 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 3970 } | |
| 3971 } | |
| 3972 | |
| 3973 | |
| 3974 // Refer to the comments in os_solaris.cpp park-unpark. | |
| 3975 // | |
| 3976 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
| 3977 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
| 3978 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
| 3979 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
| 3980 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
| 3981 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
| 3982 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
| 3983 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
| 3984 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
| 3985 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
| 3986 // of libpthread avoids the problem, but isn't practical. | |
| 3987 // | |
| 3988 // Possible remedies: | |
| 3989 // | |
| 3990 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
| 3991 // This is palliative and probabilistic, however. If the thread is preempted | |
| 3992 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
| 3993 // than the minimum period may have passed, and the abstime may be stale (in the | |
| 3994 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
| 3995 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
| 3996 // | |
| 3997 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
| 3998 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
| 3999 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
| 4000 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
| 4001 // thread. | |
| 4002 // | |
| 4003 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
| 4004 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
| 4005 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
| 4006 // This also works well. In fact it avoids kernel-level scalability impediments | |
| 4007 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
| 4008 // timers in a graceful fashion. | |
| 4009 // | |
| 4010 // 4. When the abstime value is in the past it appears that control returns | |
| 4011 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
| 4012 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
| 4013 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
| 4014 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
| 4015 // It may be possible to avoid reinitialization by checking the return | |
| 4016 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
| 4017 // condvar we must establish the invariant that cond_signal() is only called | |
| 4018 // within critical sections protected by the adjunct mutex. This prevents | |
| 4019 // cond_signal() from "seeing" a condvar that's in the midst of being | |
| 4020 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
| 4021 // desirable signal-after-unlock optimization that avoids futile context switching. | |
| 4022 // | |
| 4023 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
| 4024 // structure when a condvar is used or initialized. cond_destroy() would | |
| 4025 // release the helper structure. Our reinitialize-after-timedwait fix | |
| 4026 // put excessive stress on malloc/free and locks protecting the c-heap. | |
| 4027 // | |
| 4028 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
| 4029 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
| 4030 // and only enabling the work-around for vulnerable environments. | |
| 4031 | |
| 4032 // utility to compute the abstime argument to timedwait: | |
| 4033 // millis is the relative timeout time | |
| 4034 // abstime will be the absolute timeout time | |
| 4035 // TODO: replace compute_abstime() with unpackTime() | |
| 4036 | |
| 4037 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
| 4038 if (millis < 0) millis = 0; | |
| 4039 struct timeval now; | |
| 4040 int status = gettimeofday(&now, NULL); | |
| 4041 assert(status == 0, "gettimeofday"); | |
| 4042 jlong seconds = millis / 1000; | |
| 4043 millis %= 1000; | |
| 4044 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
| 4045 seconds = 50000000; | |
| 4046 } | |
| 4047 abstime->tv_sec = now.tv_sec + seconds; | |
| 4048 long usec = now.tv_usec + millis * 1000; | |
| 4049 if (usec >= 1000000) { | |
| 4050 abstime->tv_sec += 1; | |
| 4051 usec -= 1000000; | |
| 4052 } | |
| 4053 abstime->tv_nsec = usec * 1000; | |
| 4054 return abstime; | |
| 4055 } | |
| 4056 | |
| 4057 | |
| 4058 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
| 4059 // Conceptually TryPark() should be equivalent to park(0). | |
| 4060 | |
| 4061 int os::PlatformEvent::TryPark() { | |
| 4062 for (;;) { | |
| 4063 const int v = _Event ; | |
| 4064 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 4065 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
| 4066 } | |
| 4067 } | |
| 4068 | |
| 4069 void os::PlatformEvent::park() { // AKA "down()" | |
| 4070 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 4071 // may call park(). | |
| 4072 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
| 4073 int v ; | |
| 4074 for (;;) { | |
| 4075 v = _Event ; | |
| 4076 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4077 } | |
| 4078 guarantee (v >= 0, "invariant") ; | |
| 4079 if (v == 0) { | |
| 4080 // Do this the hard way by blocking ... | |
| 4081 int status = pthread_mutex_lock(_mutex); | |
| 4082 assert_status(status == 0, status, "mutex_lock"); | |
| 4083 guarantee (_nParked == 0, "invariant") ; | |
| 4084 ++ _nParked ; | |
| 4085 while (_Event < 0) { | |
| 4086 status = pthread_cond_wait(_cond, _mutex); | |
| 4087 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
| 4088 // Treat this the same as if the wait was interrupted | |
| 4089 if (status == ETIMEDOUT) { status = EINTR; } | |
| 4090 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
| 4091 } | |
| 4092 -- _nParked ; | |
| 4093 | |
| 4094 // In theory we could move the ST of 0 into _Event past the unlock(), | |
| 4095 // but then we'd need a MEMBAR after the ST. | |
| 4096 _Event = 0 ; | |
| 4097 status = pthread_mutex_unlock(_mutex); | |
| 4098 assert_status(status == 0, status, "mutex_unlock"); | |
| 4099 } | |
| 4100 guarantee (_Event >= 0, "invariant") ; | |
| 4101 } | |
| 4102 | |
| 4103 int os::PlatformEvent::park(jlong millis) { | |
| 4104 guarantee (_nParked == 0, "invariant") ; | |
| 4105 | |
| 4106 int v ; | |
| 4107 for (;;) { | |
| 4108 v = _Event ; | |
| 4109 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4110 } | |
| 4111 guarantee (v >= 0, "invariant") ; | |
| 4112 if (v != 0) return OS_OK ; | |
| 4113 | |
| 4114 // We do this the hard way, by blocking the thread. | |
| 4115 // Consider enforcing a minimum timeout value. | |
| 4116 struct timespec abst; | |
| 4117 compute_abstime(&abst, millis); | |
| 4118 | |
| 4119 int ret = OS_TIMEOUT; | |
| 4120 int status = pthread_mutex_lock(_mutex); | |
| 4121 assert_status(status == 0, status, "mutex_lock"); | |
| 4122 guarantee (_nParked == 0, "invariant") ; | |
| 4123 ++_nParked ; | |
| 4124 | |
| 4125 // Object.wait(timo) will return because of | |
| 4126 // (a) notification | |
| 4127 // (b) timeout | |
| 4128 // (c) thread.interrupt | |
| 4129 // | |
| 4130 // Thread.interrupt and object.notify{All} both call Event::set. | |
| 4131 // That is, we treat thread.interrupt as a special case of notification. | |
| 4132 // The underlying Solaris implementation, cond_timedwait, admits | |
| 4133 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
| 4134 // JVM from making those visible to Java code. As such, we must | |
| 4135 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
| 4136 // | |
| 4137 // TODO: properly differentiate simultaneous notify+interrupt. | |
| 4138 // In that case, we should propagate the notify to another waiter. | |
| 4139 | |
| 4140 while (_Event < 0) { | |
| 4141 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
| 4142 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4143 pthread_cond_destroy (_cond); | |
| 4144 pthread_cond_init (_cond, NULL) ; | |
| 4145 } | |
| 4146 assert_status(status == 0 || status == EINTR || | |
| 4147 status == ETIMEDOUT, | |
| 4148 status, "cond_timedwait"); | |
| 4149 if (!FilterSpuriousWakeups) break ; // previous semantics | |
| 4150 if (status == ETIMEDOUT) break ; | |
| 4151 // We consume and ignore EINTR and spurious wakeups. | |
| 4152 } | |
| 4153 --_nParked ; | |
| 4154 if (_Event >= 0) { | |
| 4155 ret = OS_OK; | |
| 4156 } | |
| 4157 _Event = 0 ; | |
| 4158 status = pthread_mutex_unlock(_mutex); | |
| 4159 assert_status(status == 0, status, "mutex_unlock"); | |
| 4160 assert (_nParked == 0, "invariant") ; | |
| 4161 return ret; | |
| 4162 } | |
| 4163 | |
| 4164 void os::PlatformEvent::unpark() { | |
| 4165 int v, AnyWaiters ; | |
| 4166 for (;;) { | |
| 4167 v = _Event ; | |
| 4168 if (v > 0) { | |
| 4169 // The LD of _Event could have reordered or be satisfied | |
| 4170 // by a read-aside from this processor's write buffer. | |
| 4171 // To avoid problems execute a barrier and then | |
| 4172 // ratify the value. | |
| 4173 OrderAccess::fence() ; | |
| 4174 if (_Event == v) return ; | |
| 4175 continue ; | |
| 4176 } | |
| 4177 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; | |
| 4178 } | |
| 4179 if (v < 0) { | |
| 4180 // Wait for the thread associated with the event to vacate | |
| 4181 int status = pthread_mutex_lock(_mutex); | |
| 4182 assert_status(status == 0, status, "mutex_lock"); | |
| 4183 AnyWaiters = _nParked ; | |
| 4184 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; | |
| 4185 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4186 AnyWaiters = 0 ; | |
| 4187 pthread_cond_signal (_cond); | |
| 4188 } | |
| 4189 status = pthread_mutex_unlock(_mutex); | |
| 4190 assert_status(status == 0, status, "mutex_unlock"); | |
| 4191 if (AnyWaiters != 0) { | |
| 4192 status = pthread_cond_signal(_cond); | |
| 4193 assert_status(status == 0, status, "cond_signal"); | |
| 4194 } | |
| 4195 } | |
| 4196 | |
| 4197 // Note that we signal() _after dropping the lock for "immortal" Events. | |
| 4198 // This is safe and avoids a common class of futile wakeups. In rare | |
| 4199 // circumstances this can cause a thread to return prematurely from | |
| 4200 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
| 4201 // simply re-test the condition and re-park itself. | |
| 4202 } | |
| 4203 | |
| 4204 | |
| 4205 // JSR166 | |
| 4206 // ------------------------------------------------------- | |
| 4207 | |
| 4208 /* | |
| 4209 * The solaris and bsd implementations of park/unpark are fairly | |
| 4210 * conservative for now, but can be improved. They currently use a | |
| 4211 * mutex/condvar pair, plus a a count. | |
| 4212 * Park decrements count if > 0, else does a condvar wait. Unpark | |
| 4213 * sets count to 1 and signals condvar. Only one thread ever waits | |
| 4214 * on the condvar. Contention seen when trying to park implies that someone | |
| 4215 * is unparking you, so don't wait. And spurious returns are fine, so there | |
| 4216 * is no need to track notifications. | |
| 4217 */ | |
| 4218 | |
| 4219 #define MAX_SECS 100000000 | |
| 4220 /* | |
| 4221 * This code is common to bsd and solaris and will be moved to a | |
| 4222 * common place in dolphin. | |
| 4223 * | |
| 4224 * The passed in time value is either a relative time in nanoseconds | |
| 4225 * or an absolute time in milliseconds. Either way it has to be unpacked | |
| 4226 * into suitable seconds and nanoseconds components and stored in the | |
| 4227 * given timespec structure. | |
| 4228 * Given time is a 64-bit value and the time_t used in the timespec is only | |
| 4229 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
| 4230 * overflow if times way in the future are given. Further on Solaris versions | |
| 4231 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
| 4232 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
| 4233 * As it will be 28 years before "now + 100000000" will overflow we can | |
| 4234 * ignore overflow and just impose a hard-limit on seconds using the value | |
| 4235 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
| 4236 * years from "now". | |
| 4237 */ | |
| 4238 | |
| 4239 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
| 4240 assert (time > 0, "convertTime"); | |
| 4241 | |
| 4242 struct timeval now; | |
| 4243 int status = gettimeofday(&now, NULL); | |
| 4244 assert(status == 0, "gettimeofday"); | |
| 4245 | |
| 4246 time_t max_secs = now.tv_sec + MAX_SECS; | |
| 4247 | |
| 4248 if (isAbsolute) { | |
| 4249 jlong secs = time / 1000; | |
| 4250 if (secs > max_secs) { | |
| 4251 absTime->tv_sec = max_secs; | |
| 4252 } | |
| 4253 else { | |
| 4254 absTime->tv_sec = secs; | |
| 4255 } | |
| 4256 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
| 4257 } | |
| 4258 else { | |
| 4259 jlong secs = time / NANOSECS_PER_SEC; | |
| 4260 if (secs >= MAX_SECS) { | |
| 4261 absTime->tv_sec = max_secs; | |
| 4262 absTime->tv_nsec = 0; | |
| 4263 } | |
| 4264 else { | |
| 4265 absTime->tv_sec = now.tv_sec + secs; | |
| 4266 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
| 4267 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
| 4268 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
| 4269 ++absTime->tv_sec; // note: this must be <= max_secs | |
| 4270 } | |
| 4271 } | |
| 4272 } | |
| 4273 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
| 4274 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
| 4275 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
| 4276 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
| 4277 } | |
| 4278 | |
| 4279 void Parker::park(bool isAbsolute, jlong time) { | |
| 4280 // Optional fast-path check: | |
| 4281 // Return immediately if a permit is available. | |
| 4282 if (_counter > 0) { | |
| 4283 _counter = 0 ; | |
| 4284 OrderAccess::fence(); | |
| 4285 return ; | |
| 4286 } | |
| 4287 | |
| 4288 Thread* thread = Thread::current(); | |
| 4289 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 4290 JavaThread *jt = (JavaThread *)thread; | |
| 4291 | |
| 4292 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
| 4293 // Check interrupt before trying to wait | |
| 4294 if (Thread::is_interrupted(thread, false)) { | |
| 4295 return; | |
| 4296 } | |
| 4297 | |
| 4298 // Next, demultiplex/decode time arguments | |
| 4299 struct timespec absTime; | |
| 4300 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
| 4301 return; | |
| 4302 } | |
| 4303 if (time > 0) { | |
| 4304 unpackTime(&absTime, isAbsolute, time); | |
| 4305 } | |
| 4306 | |
| 4307 | |
| 4308 // Enter safepoint region | |
| 4309 // Beware of deadlocks such as 6317397. | |
| 4310 // The per-thread Parker:: mutex is a classic leaf-lock. | |
| 4311 // In particular a thread must never block on the Threads_lock while | |
| 4312 // holding the Parker:: mutex. If safepoints are pending both the | |
| 4313 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
| 4314 ThreadBlockInVM tbivm(jt); | |
| 4315 | |
| 4316 // Don't wait if cannot get lock since interference arises from | |
| 4317 // unblocking. Also. check interrupt before trying wait | |
| 4318 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
| 4319 return; | |
| 4320 } | |
| 4321 | |
| 4322 int status ; | |
| 4323 if (_counter > 0) { // no wait needed | |
| 4324 _counter = 0; | |
| 4325 status = pthread_mutex_unlock(_mutex); | |
| 4326 assert (status == 0, "invariant") ; | |
| 4327 OrderAccess::fence(); | |
| 4328 return; | |
| 4329 } | |
| 4330 | |
| 4331 #ifdef ASSERT | |
| 4332 // Don't catch signals while blocked; let the running threads have the signals. | |
| 4333 // (This allows a debugger to break into the running thread.) | |
| 4334 sigset_t oldsigs; | |
| 4335 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
| 4336 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
| 4337 #endif | |
| 4338 | |
| 4339 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 4340 jt->set_suspend_equivalent(); | |
| 4341 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 4342 | |
| 4343 if (time == 0) { | |
| 4344 status = pthread_cond_wait (_cond, _mutex) ; | |
| 4345 } else { | |
| 4346 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
| 4347 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4348 pthread_cond_destroy (_cond) ; | |
| 4349 pthread_cond_init (_cond, NULL); | |
| 4350 } | |
| 4351 } | |
| 4352 assert_status(status == 0 || status == EINTR || | |
| 4353 status == ETIMEDOUT, | |
| 4354 status, "cond_timedwait"); | |
| 4355 | |
| 4356 #ifdef ASSERT | |
| 4357 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
| 4358 #endif | |
| 4359 | |
| 4360 _counter = 0 ; | |
| 4361 status = pthread_mutex_unlock(_mutex) ; | |
| 4362 assert_status(status == 0, status, "invariant") ; | |
| 4363 // If externally suspended while waiting, re-suspend | |
| 4364 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 4365 jt->java_suspend_self(); | |
| 4366 } | |
| 4367 | |
| 4368 OrderAccess::fence(); | |
| 4369 } | |
| 4370 | |
| 4371 void Parker::unpark() { | |
| 4372 int s, status ; | |
| 4373 status = pthread_mutex_lock(_mutex); | |
| 4374 assert (status == 0, "invariant") ; | |
| 4375 s = _counter; | |
| 4376 _counter = 1; | |
| 4377 if (s < 1) { | |
| 4378 if (WorkAroundNPTLTimedWaitHang) { | |
| 4379 status = pthread_cond_signal (_cond) ; | |
| 4380 assert (status == 0, "invariant") ; | |
| 4381 status = pthread_mutex_unlock(_mutex); | |
| 4382 assert (status == 0, "invariant") ; | |
| 4383 } else { | |
| 4384 status = pthread_mutex_unlock(_mutex); | |
| 4385 assert (status == 0, "invariant") ; | |
| 4386 status = pthread_cond_signal (_cond) ; | |
| 4387 assert (status == 0, "invariant") ; | |
| 4388 } | |
| 4389 } else { | |
| 4390 pthread_mutex_unlock(_mutex); | |
| 4391 assert (status == 0, "invariant") ; | |
| 4392 } | |
| 4393 } | |
| 4394 | |
| 4395 | |
| 4396 /* Darwin has no "environ" in a dynamic library. */ | |
| 4397 #ifdef __APPLE__ | |
| 4398 #include <crt_externs.h> | |
| 4399 #define environ (*_NSGetEnviron()) | |
| 4400 #else | |
| 4401 extern char** environ; | |
| 4402 #endif | |
| 4403 | |
| 4404 // Run the specified command in a separate process. Return its exit value, | |
| 4405 // or -1 on failure (e.g. can't fork a new process). | |
| 4406 // Unlike system(), this function can be called from signal handler. It | |
| 4407 // doesn't block SIGINT et al. | |
| 4408 int os::fork_and_exec(char* cmd) { | |
| 4409 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
| 4410 | |
| 4411 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
| 4412 // pthread_atfork handlers and reset pthread library. All we need is a | |
| 4413 // separate process to execve. Make a direct syscall to fork process. | |
| 4414 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
| 4415 // the best... | |
| 4416 pid_t pid = fork(); | |
| 4417 | |
| 4418 if (pid < 0) { | |
| 4419 // fork failed | |
| 4420 return -1; | |
| 4421 | |
| 4422 } else if (pid == 0) { | |
| 4423 // child process | |
| 4424 | |
| 4425 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
| 4426 // first to kill every thread on the thread list. Because this list is | |
| 4427 // not reset by fork() (see notes above), execve() will instead kill | |
| 4428 // every thread in the parent process. We know this is the only thread | |
| 4429 // in the new process, so make a system call directly. | |
| 4430 // IA64 should use normal execve() from glibc to match the glibc fork() | |
| 4431 // above. | |
| 4432 execve("/bin/sh", (char* const*)argv, environ); | |
| 4433 | |
| 4434 // execve failed | |
| 4435 _exit(-1); | |
| 4436 | |
| 4437 } else { | |
| 4438 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
| 4439 // care about the actual exit code, for now. | |
| 4440 | |
| 4441 int status; | |
| 4442 | |
| 4443 // Wait for the child process to exit. This returns immediately if | |
| 4444 // the child has already exited. */ | |
| 4445 while (waitpid(pid, &status, 0) < 0) { | |
| 4446 switch (errno) { | |
| 4447 case ECHILD: return 0; | |
| 4448 case EINTR: break; | |
| 4449 default: return -1; | |
| 4450 } | |
| 4451 } | |
| 4452 | |
| 4453 if (WIFEXITED(status)) { | |
| 4454 // The child exited normally; get its exit code. | |
| 4455 return WEXITSTATUS(status); | |
| 4456 } else if (WIFSIGNALED(status)) { | |
| 4457 // The child exited because of a signal | |
| 4458 // The best value to return is 0x80 + signal number, | |
| 4459 // because that is what all Unix shells do, and because | |
| 4460 // it allows callers to distinguish between process exit and | |
| 4461 // process death by signal. | |
| 4462 return 0x80 + WTERMSIG(status); | |
| 4463 } else { | |
| 4464 // Unknown exit code; pass it through | |
| 4465 return status; | |
| 4466 } | |
| 4467 } | |
| 4468 } | |
| 4469 | |
| 4470 // is_headless_jre() | |
| 4471 // | |
|
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4472 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
| 3960 | 4473 // in order to report if we are running in a headless jre |
| 4474 // | |
|
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4475 // Since JDK8 xawt/libmawt.so was moved into the same directory |
|
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4476 // as libawt.so, and renamed libawt_xawt.so |
|
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|
4477 // |
| 3960 | 4478 bool os::is_headless_jre() { |
| 4479 struct stat statbuf; | |
| 4480 char buf[MAXPATHLEN]; | |
| 4481 char libmawtpath[MAXPATHLEN]; | |
| 4006 | 4482 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
| 5921 | 4483 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
| 3960 | 4484 char *p; |
| 4485 | |
| 4486 // Get path to libjvm.so | |
| 4487 os::jvm_path(buf, sizeof(buf)); | |
| 4488 | |
| 4489 // Get rid of libjvm.so | |
| 4490 p = strrchr(buf, '/'); | |
| 4491 if (p == NULL) return false; | |
| 4492 else *p = '\0'; | |
| 4493 | |
| 4494 // Get rid of client or server | |
| 4495 p = strrchr(buf, '/'); | |
| 4496 if (p == NULL) return false; | |
| 4497 else *p = '\0'; | |
| 4498 | |
| 4499 // check xawt/libmawt.so | |
| 4500 strcpy(libmawtpath, buf); | |
| 4501 strcat(libmawtpath, xawtstr); | |
| 4502 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
| 4503 | |
|
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4504 // check libawt_xawt.so |
| 3960 | 4505 strcpy(libmawtpath, buf); |
|
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|
4506 strcat(libmawtpath, new_xawtstr); |
| 3960 | 4507 if (::stat(libmawtpath, &statbuf) == 0) return false; |
| 4508 | |
| 4509 return true; | |
| 4510 } | |
|
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|
4511 |
|
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|
4512 // Get the default path to the core file |
|
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|
4513 // Returns the length of the string |
|
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|
4514 int os::get_core_path(char* buffer, size_t bufferSize) { |
|
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|
4515 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
|
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|
4516 |
|
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|
4517 // Truncate if theoretical string was longer than bufferSize |
|
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|
4518 n = MIN2(n, (int)bufferSize); |
|
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|
4519 |
|
65906dc96aa1
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|
4520 return n; |
|
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|
4521 } |