Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 7629:22ba8c8ce6a6
8004902: correctness fixes motivated by contended locking work (6607129)
Summary: misc correctness fixes
Reviewed-by: acorn, dholmes, dice, sspitsyn
Contributed-by: dave.dice@oracle.com
| author | dcubed |
|---|---|
| date | Tue, 22 Jan 2013 05:56:42 -0800 |
| parents | c07c102cbad7 |
| children | 3ac7d10a6572 758935f7c23f |
| rev | line source |
|---|---|
| 3960 | 1 /* |
|
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| 3960 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // no precompiled headers | |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "classfile/vmSymbols.hpp" | |
| 29 #include "code/icBuffer.hpp" | |
| 30 #include "code/vtableStubs.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
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32 #include "compiler/disassembler.hpp" |
| 3960 | 33 #include "interpreter/interpreter.hpp" |
| 34 #include "jvm_bsd.h" | |
| 35 #include "memory/allocation.inline.hpp" | |
| 36 #include "memory/filemap.hpp" | |
| 37 #include "mutex_bsd.inline.hpp" | |
| 38 #include "oops/oop.inline.hpp" | |
| 39 #include "os_share_bsd.hpp" | |
| 40 #include "prims/jniFastGetField.hpp" | |
| 41 #include "prims/jvm.h" | |
| 42 #include "prims/jvm_misc.hpp" | |
| 43 #include "runtime/arguments.hpp" | |
| 44 #include "runtime/extendedPC.hpp" | |
| 45 #include "runtime/globals.hpp" | |
| 46 #include "runtime/interfaceSupport.hpp" | |
| 47 #include "runtime/java.hpp" | |
| 48 #include "runtime/javaCalls.hpp" | |
| 49 #include "runtime/mutexLocker.hpp" | |
| 50 #include "runtime/objectMonitor.hpp" | |
| 51 #include "runtime/osThread.hpp" | |
| 52 #include "runtime/perfMemory.hpp" | |
| 53 #include "runtime/sharedRuntime.hpp" | |
| 54 #include "runtime/statSampler.hpp" | |
| 55 #include "runtime/stubRoutines.hpp" | |
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56 #include "runtime/thread.inline.hpp" |
| 3960 | 57 #include "runtime/threadCritical.hpp" |
| 58 #include "runtime/timer.hpp" | |
| 59 #include "services/attachListener.hpp" | |
| 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; | |
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246 julong mem_val; |
| 3960 | 247 |
| 248 /* get processors count via hw.ncpus sysctl */ | |
| 249 mib[0] = CTL_HW; | |
| 250 mib[1] = HW_NCPU; | |
| 251 len = sizeof(cpu_val); | |
| 252 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
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253 assert(len == sizeof(cpu_val), "unexpected data size"); |
| 3960 | 254 set_processor_count(cpu_val); |
| 255 } | |
| 256 else { | |
| 257 set_processor_count(1); // fallback | |
| 258 } | |
| 259 | |
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260 /* get physical memory via hw.memsize sysctl (hw.memsize is used |
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261 * since it returns a 64 bit value) |
| 3960 | 262 */ |
| 263 mib[0] = CTL_HW; | |
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264 mib[1] = HW_MEMSIZE; |
| 3960 | 265 len = sizeof(mem_val); |
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266 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) { |
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267 assert(len == sizeof(mem_val), "unexpected data size"); |
| 3960 | 268 _physical_memory = mem_val; |
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269 } else { |
| 3960 | 270 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) |
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271 } |
| 3960 | 272 |
| 273 #ifdef __OpenBSD__ | |
| 274 { | |
| 275 // limit _physical_memory memory view on OpenBSD since | |
| 276 // datasize rlimit restricts us anyway. | |
| 277 struct rlimit limits; | |
| 278 getrlimit(RLIMIT_DATA, &limits); | |
| 279 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
| 280 } | |
| 281 #endif | |
| 282 } | |
| 283 | |
| 4006 | 284 #ifdef __APPLE__ |
| 285 static const char *get_home() { | |
| 286 const char *home_dir = ::getenv("HOME"); | |
| 287 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
| 288 struct passwd *passwd_info = getpwuid(geteuid()); | |
| 289 if (passwd_info != NULL) { | |
| 290 home_dir = passwd_info->pw_dir; | |
| 291 } | |
| 292 } | |
| 293 | |
| 294 return home_dir; | |
| 295 } | |
| 296 #endif | |
| 297 | |
| 3960 | 298 void os::init_system_properties_values() { |
| 299 // char arch[12]; | |
| 300 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
| 301 | |
| 302 // The next steps are taken in the product version: | |
| 303 // | |
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304 // Obtain the JAVA_HOME value from the location of libjvm.so. |
| 3960 | 305 // This library should be located at: |
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306 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. |
| 3960 | 307 // |
| 308 // If "/jre/lib/" appears at the right place in the path, then we | |
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309 // assume libjvm.so is installed in a JDK and we use this path. |
| 3960 | 310 // |
| 311 // Otherwise exit with message: "Could not create the Java virtual machine." | |
| 312 // | |
| 313 // The following extra steps are taken in the debugging version: | |
| 314 // | |
| 315 // If "/jre/lib/" does NOT appear at the right place in the path | |
| 316 // instead of exit check for $JAVA_HOME environment variable. | |
| 317 // | |
| 318 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
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319 // then we append a fake suffix "hotspot/libjvm.so" to this path so |
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320 // it looks like libjvm.so is installed there |
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321 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. |
| 3960 | 322 // |
| 323 // Otherwise exit. | |
| 324 // | |
| 325 // Important note: if the location of libjvm.so changes this | |
| 326 // code needs to be changed accordingly. | |
| 327 | |
| 328 // The next few definitions allow the code to be verbatim: | |
| 6197 | 329 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
| 3960 | 330 #define getenv(n) ::getenv(n) |
| 331 | |
| 332 /* | |
| 333 * See ld(1): | |
| 334 * The linker uses the following search paths to locate required | |
| 335 * shared libraries: | |
| 336 * 1: ... | |
| 337 * ... | |
| 338 * 7: The default directories, normally /lib and /usr/lib. | |
| 339 */ | |
| 340 #ifndef DEFAULT_LIBPATH | |
| 341 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
| 342 #endif | |
| 343 | |
| 344 #define EXTENSIONS_DIR "/lib/ext" | |
| 345 #define ENDORSED_DIR "/lib/endorsed" | |
| 346 #define REG_DIR "/usr/java/packages" | |
| 347 | |
| 4006 | 348 #ifdef __APPLE__ |
| 349 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
| 350 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
| 351 const char *user_home_dir = get_home(); | |
| 352 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
| 353 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
| 354 sizeof(SYS_EXTENSIONS_DIRS); | |
| 355 #endif | |
| 356 | |
| 3960 | 357 { |
| 358 /* sysclasspath, java_home, dll_dir */ | |
| 359 { | |
| 360 char *home_path; | |
| 361 char *dll_path; | |
| 362 char *pslash; | |
| 363 char buf[MAXPATHLEN]; | |
| 364 os::jvm_path(buf, sizeof(buf)); | |
| 365 | |
| 366 // Found the full path to libjvm.so. | |
| 367 // Now cut the path to <java_home>/jre if we can. | |
| 368 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
| 369 pslash = strrchr(buf, '/'); | |
| 370 if (pslash != NULL) | |
| 371 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
| 372 dll_path = malloc(strlen(buf) + 1); | |
| 373 if (dll_path == NULL) | |
| 374 return; | |
| 375 strcpy(dll_path, buf); | |
| 376 Arguments::set_dll_dir(dll_path); | |
| 377 | |
| 378 if (pslash != NULL) { | |
| 379 pslash = strrchr(buf, '/'); | |
| 380 if (pslash != NULL) { | |
| 4006 | 381 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
| 382 #ifndef __APPLE__ | |
| 3960 | 383 pslash = strrchr(buf, '/'); |
| 384 if (pslash != NULL) | |
| 385 *pslash = '\0'; /* get rid of /lib */ | |
| 4006 | 386 #endif |
| 3960 | 387 } |
| 388 } | |
| 389 | |
| 390 home_path = malloc(strlen(buf) + 1); | |
| 391 if (home_path == NULL) | |
| 392 return; | |
| 393 strcpy(home_path, buf); | |
| 394 Arguments::set_java_home(home_path); | |
| 395 | |
| 396 if (!set_boot_path('/', ':')) | |
| 397 return; | |
| 398 } | |
| 399 | |
| 400 /* | |
| 401 * Where to look for native libraries | |
| 402 * | |
| 403 * Note: Due to a legacy implementation, most of the library path | |
| 404 * is set in the launcher. This was to accomodate linking restrictions | |
| 405 * on legacy Bsd implementations (which are no longer supported). | |
| 406 * Eventually, all the library path setting will be done here. | |
| 407 * | |
| 408 * However, to prevent the proliferation of improperly built native | |
| 409 * libraries, the new path component /usr/java/packages is added here. | |
| 410 * Eventually, all the library path setting will be done here. | |
| 411 */ | |
| 412 { | |
| 413 char *ld_library_path; | |
| 414 | |
| 415 /* | |
| 416 * Construct the invariant part of ld_library_path. Note that the | |
| 417 * space for the colon and the trailing null are provided by the | |
| 418 * nulls included by the sizeof operator (so actually we allocate | |
| 419 * a byte more than necessary). | |
| 420 */ | |
| 4006 | 421 #ifdef __APPLE__ |
| 422 ld_library_path = (char *) malloc(system_ext_size); | |
| 423 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
| 424 #else | |
| 3960 | 425 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
| 426 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
| 427 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
| 4006 | 428 #endif |
| 3960 | 429 |
| 430 /* | |
| 431 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
| 432 * should always exist (until the legacy problem cited above is | |
| 433 * addressed). | |
| 434 */ | |
| 435 #ifdef __APPLE__ | |
| 4006 | 436 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
| 437 char *l = getenv("JAVA_LIBRARY_PATH"); | |
| 438 if (l != NULL) { | |
| 439 char *t = ld_library_path; | |
| 440 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 441 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
| 442 sprintf(ld_library_path, "%s:%s", l, t); | |
| 443 free(t); | |
| 444 } | |
| 445 | |
| 3960 | 446 char *v = getenv("DYLD_LIBRARY_PATH"); |
| 447 #else | |
| 448 char *v = getenv("LD_LIBRARY_PATH"); | |
| 449 #endif | |
| 450 if (v != NULL) { | |
| 451 char *t = ld_library_path; | |
| 452 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 453 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
| 454 sprintf(ld_library_path, "%s:%s", v, t); | |
| 4006 | 455 free(t); |
| 3960 | 456 } |
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457 |
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458 #ifdef __APPLE__ |
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459 // Apple's Java6 has "." at the beginning of java.library.path. |
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460 // OpenJDK on Windows has "." at the end of java.library.path. |
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461 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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462 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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463 // "." is appended to the end of java.library.path. Yes, this |
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464 // could cause a change in behavior, but Apple's Java6 behavior |
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465 // can be achieved by putting "." at the beginning of the |
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466 // JAVA_LIBRARY_PATH environment variable. |
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467 { |
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468 char *t = ld_library_path; |
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469 // that's +3 for appending ":." and the trailing '\0' |
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470 ld_library_path = (char *) malloc(strlen(t) + 3); |
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471 sprintf(ld_library_path, "%s:%s", t, "."); |
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472 free(t); |
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473 } |
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474 #endif |
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475 |
| 3960 | 476 Arguments::set_library_path(ld_library_path); |
| 477 } | |
| 478 | |
| 479 /* | |
| 480 * Extensions directories. | |
| 481 * | |
| 482 * Note that the space for the colon and the trailing null are provided | |
| 483 * by the nulls included by the sizeof operator (so actually one byte more | |
| 484 * than necessary is allocated). | |
| 485 */ | |
| 486 { | |
| 4006 | 487 #ifdef __APPLE__ |
| 488 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
| 489 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
| 490 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
| 491 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
| 492 #else | |
| 3960 | 493 char *buf = malloc(strlen(Arguments::get_java_home()) + |
| 494 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
| 495 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
| 496 Arguments::get_java_home()); | |
| 4006 | 497 #endif |
| 498 | |
| 3960 | 499 Arguments::set_ext_dirs(buf); |
| 500 } | |
| 501 | |
| 502 /* Endorsed standards default directory. */ | |
| 503 { | |
| 504 char * buf; | |
| 505 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
| 506 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
| 507 Arguments::set_endorsed_dirs(buf); | |
| 508 } | |
| 509 } | |
| 510 | |
| 4006 | 511 #ifdef __APPLE__ |
| 512 #undef SYS_EXTENSIONS_DIR | |
| 513 #endif | |
| 3960 | 514 #undef malloc |
| 515 #undef getenv | |
| 516 #undef EXTENSIONS_DIR | |
| 517 #undef ENDORSED_DIR | |
| 518 | |
| 519 // Done | |
| 520 return; | |
| 521 } | |
| 522 | |
| 523 //////////////////////////////////////////////////////////////////////////////// | |
| 524 // breakpoint support | |
| 525 | |
| 526 void os::breakpoint() { | |
| 527 BREAKPOINT; | |
| 528 } | |
| 529 | |
| 530 extern "C" void breakpoint() { | |
| 531 // use debugger to set breakpoint here | |
| 532 } | |
| 533 | |
| 534 //////////////////////////////////////////////////////////////////////////////// | |
| 535 // signal support | |
| 536 | |
| 537 debug_only(static bool signal_sets_initialized = false); | |
| 538 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
| 539 | |
| 540 bool os::Bsd::is_sig_ignored(int sig) { | |
| 541 struct sigaction oact; | |
| 542 sigaction(sig, (struct sigaction*)NULL, &oact); | |
| 543 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
| 544 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
| 545 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
| 546 return true; | |
| 547 else | |
| 548 return false; | |
| 549 } | |
| 550 | |
| 551 void os::Bsd::signal_sets_init() { | |
| 552 // Should also have an assertion stating we are still single-threaded. | |
| 553 assert(!signal_sets_initialized, "Already initialized"); | |
| 554 // Fill in signals that are necessarily unblocked for all threads in | |
| 555 // the VM. Currently, we unblock the following signals: | |
| 556 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
| 557 // by -Xrs (=ReduceSignalUsage)); | |
| 558 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
| 559 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
| 560 // the dispositions or masks wrt these signals. | |
| 561 // Programs embedding the VM that want to use the above signals for their | |
| 562 // own purposes must, at this time, use the "-Xrs" option to prevent | |
| 563 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
| 564 // (See bug 4345157, and other related bugs). | |
| 565 // In reality, though, unblocking these signals is really a nop, since | |
| 566 // these signals are not blocked by default. | |
| 567 sigemptyset(&unblocked_sigs); | |
| 568 sigemptyset(&allowdebug_blocked_sigs); | |
| 569 sigaddset(&unblocked_sigs, SIGILL); | |
| 570 sigaddset(&unblocked_sigs, SIGSEGV); | |
| 571 sigaddset(&unblocked_sigs, SIGBUS); | |
| 572 sigaddset(&unblocked_sigs, SIGFPE); | |
| 573 sigaddset(&unblocked_sigs, SR_signum); | |
| 574 | |
| 575 if (!ReduceSignalUsage) { | |
| 576 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
| 577 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
| 578 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
| 579 } | |
| 580 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
| 581 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
| 582 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
| 583 } | |
| 584 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
| 585 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
| 586 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
| 587 } | |
| 588 } | |
| 589 // Fill in signals that are blocked by all but the VM thread. | |
| 590 sigemptyset(&vm_sigs); | |
| 591 if (!ReduceSignalUsage) | |
| 592 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
| 593 debug_only(signal_sets_initialized = true); | |
| 594 | |
| 595 } | |
| 596 | |
| 597 // These are signals that are unblocked while a thread is running Java. | |
| 598 // (For some reason, they get blocked by default.) | |
| 599 sigset_t* os::Bsd::unblocked_signals() { | |
| 600 assert(signal_sets_initialized, "Not initialized"); | |
| 601 return &unblocked_sigs; | |
| 602 } | |
| 603 | |
| 604 // These are the signals that are blocked while a (non-VM) thread is | |
| 605 // running Java. Only the VM thread handles these signals. | |
| 606 sigset_t* os::Bsd::vm_signals() { | |
| 607 assert(signal_sets_initialized, "Not initialized"); | |
| 608 return &vm_sigs; | |
| 609 } | |
| 610 | |
| 611 // These are signals that are blocked during cond_wait to allow debugger in | |
| 612 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
| 613 assert(signal_sets_initialized, "Not initialized"); | |
| 614 return &allowdebug_blocked_sigs; | |
| 615 } | |
| 616 | |
| 617 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
| 618 | |
| 619 //Save caller's signal mask before setting VM signal mask | |
| 620 sigset_t caller_sigmask; | |
| 621 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
| 622 | |
| 623 OSThread* osthread = thread->osthread(); | |
| 624 osthread->set_caller_sigmask(caller_sigmask); | |
| 625 | |
| 626 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
| 627 | |
| 628 if (!ReduceSignalUsage) { | |
| 629 if (thread->is_VM_thread()) { | |
| 630 // Only the VM thread handles BREAK_SIGNAL ... | |
| 631 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
| 632 } else { | |
| 633 // ... all other threads block BREAK_SIGNAL | |
| 634 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
| 635 } | |
| 636 } | |
| 637 } | |
| 638 | |
| 639 | |
| 640 ////////////////////////////////////////////////////////////////////////////// | |
| 641 // create new thread | |
| 642 | |
| 643 static address highest_vm_reserved_address(); | |
| 644 | |
| 645 // check if it's safe to start a new thread | |
| 646 static bool _thread_safety_check(Thread* thread) { | |
| 6918 | 647 return true; |
| 3960 | 648 } |
| 649 | |
| 4006 | 650 #ifdef __APPLE__ |
| 651 // library handle for calling objc_registerThreadWithCollector() | |
| 652 // without static linking to the libobjc library | |
| 653 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
| 654 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
| 655 typedef void (*objc_registerThreadWithCollector_t)(); | |
| 656 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
| 657 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
| 658 #endif | |
| 659 | |
| 3960 | 660 // Thread start routine for all newly created threads |
| 661 static void *java_start(Thread *thread) { | |
| 662 // Try to randomize the cache line index of hot stack frames. | |
| 663 // This helps when threads of the same stack traces evict each other's | |
| 664 // cache lines. The threads can be either from the same JVM instance, or | |
| 665 // from different JVM instances. The benefit is especially true for | |
| 666 // processors with hyperthreading technology. | |
| 667 static int counter = 0; | |
| 668 int pid = os::current_process_id(); | |
| 669 alloca(((pid ^ counter++) & 7) * 128); | |
| 670 | |
| 671 ThreadLocalStorage::set_thread(thread); | |
| 672 | |
| 673 OSThread* osthread = thread->osthread(); | |
| 674 Monitor* sync = osthread->startThread_lock(); | |
| 675 | |
| 676 // non floating stack BsdThreads needs extra check, see above | |
| 677 if (!_thread_safety_check(thread)) { | |
| 678 // notify parent thread | |
| 679 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 680 osthread->set_state(ZOMBIE); | |
| 681 sync->notify_all(); | |
| 682 return NULL; | |
| 683 } | |
| 684 | |
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685 #ifdef __APPLE__ |
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686 // thread_id is mach thread on macos |
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687 osthread->set_thread_id(::mach_thread_self()); |
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688 #else |
| 3960 | 689 // thread_id is pthread_id on BSD |
| 690 osthread->set_thread_id(::pthread_self()); | |
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691 #endif |
| 3960 | 692 // initialize signal mask for this thread |
| 693 os::Bsd::hotspot_sigmask(thread); | |
| 694 | |
| 695 // initialize floating point control register | |
| 696 os::Bsd::init_thread_fpu_state(); | |
| 697 | |
| 4006 | 698 #ifdef __APPLE__ |
| 699 // register thread with objc gc | |
| 700 if (objc_registerThreadWithCollectorFunction != NULL) { | |
| 701 objc_registerThreadWithCollectorFunction(); | |
| 702 } | |
| 703 #endif | |
| 704 | |
| 3960 | 705 // handshaking with parent thread |
| 706 { | |
| 707 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 708 | |
| 709 // notify parent thread | |
| 710 osthread->set_state(INITIALIZED); | |
| 711 sync->notify_all(); | |
| 712 | |
| 713 // wait until os::start_thread() | |
| 714 while (osthread->get_state() == INITIALIZED) { | |
| 715 sync->wait(Mutex::_no_safepoint_check_flag); | |
| 716 } | |
| 717 } | |
| 718 | |
| 719 // call one more level start routine | |
| 720 thread->run(); | |
| 721 | |
| 722 return 0; | |
| 723 } | |
| 724 | |
| 725 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 726 assert(thread->osthread() == NULL, "caller responsible"); | |
| 727 | |
| 728 // Allocate the OSThread object | |
| 729 OSThread* osthread = new OSThread(NULL, NULL); | |
| 730 if (osthread == NULL) { | |
| 731 return false; | |
| 732 } | |
| 733 | |
| 734 // set the correct thread state | |
| 735 osthread->set_thread_type(thr_type); | |
| 736 | |
| 737 // Initial state is ALLOCATED but not INITIALIZED | |
| 738 osthread->set_state(ALLOCATED); | |
| 739 | |
| 740 thread->set_osthread(osthread); | |
| 741 | |
| 742 // init thread attributes | |
| 743 pthread_attr_t attr; | |
| 744 pthread_attr_init(&attr); | |
| 745 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
| 746 | |
| 747 // stack size | |
| 748 if (os::Bsd::supports_variable_stack_size()) { | |
| 749 // calculate stack size if it's not specified by caller | |
| 750 if (stack_size == 0) { | |
| 751 stack_size = os::Bsd::default_stack_size(thr_type); | |
| 752 | |
| 753 switch (thr_type) { | |
| 754 case os::java_thread: | |
| 755 // Java threads use ThreadStackSize which default value can be | |
| 756 // changed with the flag -Xss | |
| 757 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
| 758 stack_size = JavaThread::stack_size_at_create(); | |
| 759 break; | |
| 760 case os::compiler_thread: | |
| 761 if (CompilerThreadStackSize > 0) { | |
| 762 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 763 break; | |
| 764 } // else fall through: | |
| 765 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 766 case os::vm_thread: | |
| 767 case os::pgc_thread: | |
| 768 case os::cgc_thread: | |
| 769 case os::watcher_thread: | |
| 770 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 771 break; | |
| 772 } | |
| 773 } | |
| 774 | |
| 775 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
| 776 pthread_attr_setstacksize(&attr, stack_size); | |
| 777 } else { | |
| 778 // let pthread_create() pick the default value. | |
| 779 } | |
| 780 | |
| 781 ThreadState state; | |
| 782 | |
| 783 { | |
| 784 pthread_t tid; | |
| 785 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
| 786 | |
| 787 pthread_attr_destroy(&attr); | |
| 788 | |
| 789 if (ret != 0) { | |
| 790 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 791 perror("pthread_create()"); | |
| 792 } | |
| 793 // Need to clean up stuff we've allocated so far | |
| 794 thread->set_osthread(NULL); | |
| 795 delete osthread; | |
| 796 return false; | |
| 797 } | |
| 798 | |
| 799 // Store pthread info into the OSThread | |
| 800 osthread->set_pthread_id(tid); | |
| 801 | |
| 802 // Wait until child thread is either initialized or aborted | |
| 803 { | |
| 804 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 805 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 806 while ((state = osthread->get_state()) == ALLOCATED) { | |
| 807 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
| 808 } | |
| 809 } | |
| 810 | |
| 811 } | |
| 812 | |
| 813 // Aborted due to thread limit being reached | |
| 814 if (state == ZOMBIE) { | |
| 815 thread->set_osthread(NULL); | |
| 816 delete osthread; | |
| 817 return false; | |
| 818 } | |
| 819 | |
| 820 // The thread is returned suspended (in state INITIALIZED), | |
| 821 // and is started higher up in the call chain | |
| 822 assert(state == INITIALIZED, "race condition"); | |
| 823 return true; | |
| 824 } | |
| 825 | |
| 826 ///////////////////////////////////////////////////////////////////////////// | |
| 827 // attach existing thread | |
| 828 | |
| 829 // bootstrap the main thread | |
| 830 bool os::create_main_thread(JavaThread* thread) { | |
| 831 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
| 832 return create_attached_thread(thread); | |
| 833 } | |
| 834 | |
| 835 bool os::create_attached_thread(JavaThread* thread) { | |
| 836 #ifdef ASSERT | |
| 837 thread->verify_not_published(); | |
| 838 #endif | |
| 839 | |
| 840 // Allocate the OSThread object | |
| 841 OSThread* osthread = new OSThread(NULL, NULL); | |
| 842 | |
| 843 if (osthread == NULL) { | |
| 844 return false; | |
| 845 } | |
| 846 | |
| 847 // Store pthread info into the OSThread | |
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848 #ifdef __APPLE__ |
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849 osthread->set_thread_id(::mach_thread_self()); |
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850 #else |
| 3960 | 851 osthread->set_thread_id(::pthread_self()); |
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852 #endif |
| 3960 | 853 osthread->set_pthread_id(::pthread_self()); |
| 854 | |
| 855 // initialize floating point control register | |
| 856 os::Bsd::init_thread_fpu_state(); | |
| 857 | |
| 858 // Initial thread state is RUNNABLE | |
| 859 osthread->set_state(RUNNABLE); | |
| 860 | |
| 861 thread->set_osthread(osthread); | |
| 862 | |
| 863 // initialize signal mask for this thread | |
| 864 // and save the caller's signal mask | |
| 865 os::Bsd::hotspot_sigmask(thread); | |
| 866 | |
| 867 return true; | |
| 868 } | |
| 869 | |
| 870 void os::pd_start_thread(Thread* thread) { | |
| 871 OSThread * osthread = thread->osthread(); | |
| 872 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
| 873 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 874 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 875 sync_with_child->notify(); | |
| 876 } | |
| 877 | |
| 878 // Free Bsd resources related to the OSThread | |
| 879 void os::free_thread(OSThread* osthread) { | |
| 880 assert(osthread != NULL, "osthread not set"); | |
| 881 | |
| 882 if (Thread::current()->osthread() == osthread) { | |
| 883 // Restore caller's signal mask | |
| 884 sigset_t sigmask = osthread->caller_sigmask(); | |
| 885 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
| 886 } | |
| 887 | |
| 888 delete osthread; | |
| 889 } | |
| 890 | |
| 891 ////////////////////////////////////////////////////////////////////////////// | |
| 892 // thread local storage | |
| 893 | |
| 894 int os::allocate_thread_local_storage() { | |
| 895 pthread_key_t key; | |
| 896 int rslt = pthread_key_create(&key, NULL); | |
| 897 assert(rslt == 0, "cannot allocate thread local storage"); | |
| 898 return (int)key; | |
| 899 } | |
| 900 | |
| 901 // Note: This is currently not used by VM, as we don't destroy TLS key | |
| 902 // on VM exit. | |
| 903 void os::free_thread_local_storage(int index) { | |
| 904 int rslt = pthread_key_delete((pthread_key_t)index); | |
| 905 assert(rslt == 0, "invalid index"); | |
| 906 } | |
| 907 | |
| 908 void os::thread_local_storage_at_put(int index, void* value) { | |
| 909 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
| 910 assert(rslt == 0, "pthread_setspecific failed"); | |
| 911 } | |
| 912 | |
| 913 extern "C" Thread* get_thread() { | |
| 914 return ThreadLocalStorage::thread(); | |
| 915 } | |
| 916 | |
| 917 | |
| 918 //////////////////////////////////////////////////////////////////////////////// | |
| 919 // time support | |
| 920 | |
| 921 // Time since start-up in seconds to a fine granularity. | |
| 922 // Used by VMSelfDestructTimer and the MemProfiler. | |
| 923 double os::elapsedTime() { | |
| 924 | |
| 925 return (double)(os::elapsed_counter()) * 0.000001; | |
| 926 } | |
| 927 | |
| 928 jlong os::elapsed_counter() { | |
| 929 timeval time; | |
| 930 int status = gettimeofday(&time, NULL); | |
| 931 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
| 932 } | |
| 933 | |
| 934 jlong os::elapsed_frequency() { | |
| 935 return (1000 * 1000); | |
| 936 } | |
| 937 | |
| 938 // XXX: For now, code this as if BSD does not support vtime. | |
| 939 bool os::supports_vtime() { return false; } | |
| 940 bool os::enable_vtime() { return false; } | |
| 941 bool os::vtime_enabled() { return false; } | |
| 942 double os::elapsedVTime() { | |
| 943 // better than nothing, but not much | |
| 944 return elapsedTime(); | |
| 945 } | |
| 946 | |
| 947 jlong os::javaTimeMillis() { | |
| 948 timeval time; | |
| 949 int status = gettimeofday(&time, NULL); | |
| 950 assert(status != -1, "bsd error"); | |
| 951 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
| 952 } | |
| 953 | |
| 954 #ifndef CLOCK_MONOTONIC | |
| 955 #define CLOCK_MONOTONIC (1) | |
| 956 #endif | |
| 957 | |
| 958 #ifdef __APPLE__ | |
| 959 void os::Bsd::clock_init() { | |
| 960 // XXXDARWIN: Investigate replacement monotonic clock | |
| 961 } | |
| 6918 | 962 #else |
| 3960 | 963 void os::Bsd::clock_init() { |
| 964 struct timespec res; | |
| 965 struct timespec tp; | |
| 966 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
| 967 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
| 968 // yes, monotonic clock is supported | |
| 969 _clock_gettime = ::clock_gettime; | |
| 970 } | |
| 971 } | |
| 972 #endif | |
| 973 | |
| 974 | |
| 975 jlong os::javaTimeNanos() { | |
| 976 if (Bsd::supports_monotonic_clock()) { | |
| 977 struct timespec tp; | |
| 978 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
| 979 assert(status == 0, "gettime error"); | |
| 980 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
| 981 return result; | |
| 982 } else { | |
| 983 timeval time; | |
| 984 int status = gettimeofday(&time, NULL); | |
| 985 assert(status != -1, "bsd error"); | |
| 986 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
| 987 return 1000 * usecs; | |
| 988 } | |
| 989 } | |
| 990 | |
| 991 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 992 if (Bsd::supports_monotonic_clock()) { | |
| 993 info_ptr->max_value = ALL_64_BITS; | |
| 994 | |
| 995 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
| 996 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
| 997 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
| 998 } else { | |
| 999 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
| 1000 info_ptr->max_value = ALL_64_BITS; | |
| 1001 | |
| 1002 // gettimeofday is a real time clock so it skips | |
| 1003 info_ptr->may_skip_backward = true; | |
| 1004 info_ptr->may_skip_forward = true; | |
| 1005 } | |
| 1006 | |
| 1007 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 1008 } | |
| 1009 | |
| 1010 // Return the real, user, and system times in seconds from an | |
| 1011 // arbitrary fixed point in the past. | |
| 1012 bool os::getTimesSecs(double* process_real_time, | |
| 1013 double* process_user_time, | |
| 1014 double* process_system_time) { | |
| 1015 struct tms ticks; | |
| 1016 clock_t real_ticks = times(&ticks); | |
| 1017 | |
| 1018 if (real_ticks == (clock_t) (-1)) { | |
| 1019 return false; | |
| 1020 } else { | |
| 1021 double ticks_per_second = (double) clock_tics_per_sec; | |
| 1022 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
| 1023 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
| 1024 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
| 1025 | |
| 1026 return true; | |
| 1027 } | |
| 1028 } | |
| 1029 | |
| 1030 | |
| 1031 char * os::local_time_string(char *buf, size_t buflen) { | |
| 1032 struct tm t; | |
| 1033 time_t long_time; | |
| 1034 time(&long_time); | |
| 1035 localtime_r(&long_time, &t); | |
| 1036 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 1037 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
| 1038 t.tm_hour, t.tm_min, t.tm_sec); | |
| 1039 return buf; | |
| 1040 } | |
| 1041 | |
| 1042 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
| 1043 return localtime_r(clock, res); | |
| 1044 } | |
| 1045 | |
| 1046 //////////////////////////////////////////////////////////////////////////////// | |
| 1047 // runtime exit support | |
| 1048 | |
| 1049 // Note: os::shutdown() might be called very early during initialization, or | |
| 1050 // called from signal handler. Before adding something to os::shutdown(), make | |
| 1051 // sure it is async-safe and can handle partially initialized VM. | |
| 1052 void os::shutdown() { | |
| 1053 | |
| 1054 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 1055 perfMemory_exit(); | |
| 1056 | |
| 1057 // needs to remove object in file system | |
| 1058 AttachListener::abort(); | |
| 1059 | |
| 1060 // flush buffered output, finish log files | |
| 1061 ostream_abort(); | |
| 1062 | |
| 1063 // Check for abort hook | |
| 1064 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 1065 if (abort_hook != NULL) { | |
| 1066 abort_hook(); | |
| 1067 } | |
| 1068 | |
| 1069 } | |
| 1070 | |
| 1071 // Note: os::abort() might be called very early during initialization, or | |
| 1072 // called from signal handler. Before adding something to os::abort(), make | |
| 1073 // sure it is async-safe and can handle partially initialized VM. | |
| 1074 void os::abort(bool dump_core) { | |
| 1075 os::shutdown(); | |
| 1076 if (dump_core) { | |
| 1077 #ifndef PRODUCT | |
| 1078 fdStream out(defaultStream::output_fd()); | |
| 1079 out.print_raw("Current thread is "); | |
| 1080 char buf[16]; | |
| 1081 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
| 1082 out.print_raw_cr(buf); | |
| 1083 out.print_raw_cr("Dumping core ..."); | |
| 1084 #endif | |
| 1085 ::abort(); // dump core | |
| 1086 } | |
| 1087 | |
| 1088 ::exit(1); | |
| 1089 } | |
| 1090 | |
| 1091 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 1092 void os::die() { | |
| 1093 // _exit() on BsdThreads only kills current thread | |
| 1094 ::abort(); | |
| 1095 } | |
| 1096 | |
| 1097 // unused on bsd for now. | |
| 1098 void os::set_error_file(const char *logfile) {} | |
| 1099 | |
| 1100 | |
| 1101 // This method is a copy of JDK's sysGetLastErrorString | |
| 1102 // from src/solaris/hpi/src/system_md.c | |
| 1103 | |
| 1104 size_t os::lasterror(char *buf, size_t len) { | |
| 1105 | |
| 1106 if (errno == 0) return 0; | |
| 1107 | |
| 1108 const char *s = ::strerror(errno); | |
| 1109 size_t n = ::strlen(s); | |
| 1110 if (n >= len) { | |
| 1111 n = len - 1; | |
| 1112 } | |
| 1113 ::strncpy(buf, s, n); | |
| 1114 buf[n] = '\0'; | |
| 1115 return n; | |
| 1116 } | |
| 1117 | |
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1118 intx os::current_thread_id() { |
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1119 #ifdef __APPLE__ |
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1120 return (intx)::mach_thread_self(); |
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1121 #else |
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1122 return (intx)::pthread_self(); |
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1123 #endif |
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1124 } |
| 3960 | 1125 int os::current_process_id() { |
| 1126 | |
| 1127 // Under the old bsd thread library, bsd gives each thread | |
| 1128 // its own process id. Because of this each thread will return | |
| 1129 // a different pid if this method were to return the result | |
| 1130 // of getpid(2). Bsd provides no api that returns the pid | |
| 1131 // of the launcher thread for the vm. This implementation | |
| 1132 // returns a unique pid, the pid of the launcher thread | |
| 1133 // that starts the vm 'process'. | |
| 1134 | |
| 1135 // Under the NPTL, getpid() returns the same pid as the | |
| 1136 // launcher thread rather than a unique pid per thread. | |
| 1137 // Use gettid() if you want the old pre NPTL behaviour. | |
| 1138 | |
| 1139 // if you are looking for the result of a call to getpid() that | |
| 1140 // returns a unique pid for the calling thread, then look at the | |
| 1141 // OSThread::thread_id() method in osThread_bsd.hpp file | |
| 1142 | |
| 1143 return (int)(_initial_pid ? _initial_pid : getpid()); | |
| 1144 } | |
| 1145 | |
| 1146 // DLL functions | |
| 1147 | |
| 1148 #define JNI_LIB_PREFIX "lib" | |
| 1149 #ifdef __APPLE__ | |
| 1150 #define JNI_LIB_SUFFIX ".dylib" | |
| 1151 #else | |
| 1152 #define JNI_LIB_SUFFIX ".so" | |
| 1153 #endif | |
| 1154 | |
| 1155 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
| 1156 | |
| 1157 // This must be hard coded because it's the system's temporary | |
| 1158 // directory not the java application's temp directory, ala java.io.tmpdir. | |
| 4006 | 1159 #ifdef __APPLE__ |
| 1160 // macosx has a secure per-user temporary directory | |
| 1161 char temp_path_storage[PATH_MAX]; | |
| 1162 const char* os::get_temp_directory() { | |
| 1163 static char *temp_path = NULL; | |
| 1164 if (temp_path == NULL) { | |
| 1165 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
| 1166 if (pathSize == 0 || pathSize > PATH_MAX) { | |
| 1167 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
| 1168 } | |
| 1169 temp_path = temp_path_storage; | |
| 1170 } | |
| 1171 return temp_path; | |
| 1172 } | |
| 1173 #else /* __APPLE__ */ | |
| 3960 | 1174 const char* os::get_temp_directory() { return "/tmp"; } |
| 4006 | 1175 #endif /* __APPLE__ */ |
| 3960 | 1176 |
| 1177 static bool file_exists(const char* filename) { | |
| 1178 struct stat statbuf; | |
| 1179 if (filename == NULL || strlen(filename) == 0) { | |
| 1180 return false; | |
| 1181 } | |
| 1182 return os::stat(filename, &statbuf) == 0; | |
| 1183 } | |
| 1184 | |
|
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1185 bool os::dll_build_name(char* buffer, size_t buflen, |
| 3960 | 1186 const char* pname, const char* fname) { |
|
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1187 bool retval = false; |
| 3960 | 1188 // Copied from libhpi |
| 1189 const size_t pnamelen = pname ? strlen(pname) : 0; | |
| 1190 | |
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1191 // Return error on buffer overflow. |
| 3960 | 1192 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { |
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1193 return retval; |
| 3960 | 1194 } |
| 1195 | |
| 1196 if (pnamelen == 0) { | |
| 1197 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
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1198 retval = true; |
| 3960 | 1199 } else if (strchr(pname, *os::path_separator()) != NULL) { |
| 1200 int n; | |
| 1201 char** pelements = split_path(pname, &n); | |
| 1202 for (int i = 0 ; i < n ; i++) { | |
| 1203 // Really shouldn't be NULL, but check can't hurt | |
| 1204 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
| 1205 continue; // skip the empty path values | |
| 1206 } | |
| 1207 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
| 1208 pelements[i], fname); | |
| 1209 if (file_exists(buffer)) { | |
|
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1210 retval = true; |
| 3960 | 1211 break; |
| 1212 } | |
| 1213 } | |
| 1214 // release the storage | |
| 1215 for (int i = 0 ; i < n ; i++) { | |
| 1216 if (pelements[i] != NULL) { | |
| 6197 | 1217 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| 3960 | 1218 } |
| 1219 } | |
| 1220 if (pelements != NULL) { | |
| 6197 | 1221 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| 3960 | 1222 } |
| 1223 } else { | |
| 1224 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
|
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1225 retval = true; |
| 3960 | 1226 } |
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1227 return retval; |
| 3960 | 1228 } |
| 1229 | |
| 1230 const char* os::get_current_directory(char *buf, int buflen) { | |
| 1231 return getcwd(buf, buflen); | |
| 1232 } | |
| 1233 | |
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1234 // check if addr is inside libjvm.so |
| 3960 | 1235 bool os::address_is_in_vm(address addr) { |
| 1236 static address libjvm_base_addr; | |
| 1237 Dl_info dlinfo; | |
| 1238 | |
| 1239 if (libjvm_base_addr == NULL) { | |
| 1240 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
| 1241 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
| 1242 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
| 1243 } | |
| 1244 | |
| 1245 if (dladdr((void *)addr, &dlinfo)) { | |
| 1246 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
| 1247 } | |
| 1248 | |
| 1249 return false; | |
| 1250 } | |
| 1251 | |
| 6258 | 1252 |
| 1253 #define MACH_MAXSYMLEN 256 | |
| 1254 | |
| 3960 | 1255 bool os::dll_address_to_function_name(address addr, char *buf, |
| 1256 int buflen, int *offset) { | |
| 1257 Dl_info dlinfo; | |
| 6258 | 1258 char localbuf[MACH_MAXSYMLEN]; |
| 1259 | |
| 1260 // dladdr will find names of dynamic functions only, but does | |
| 1261 // it set dli_fbase with mach_header address when it "fails" ? | |
| 3960 | 1262 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { |
| 1263 if (buf != NULL) { | |
| 1264 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { | |
| 1265 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); | |
| 1266 } | |
| 1267 } | |
| 1268 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; | |
| 1269 return true; | |
| 1270 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { | |
| 1271 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), | |
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1272 buf, buflen, offset, dlinfo.dli_fname)) { |
| 3960 | 1273 return true; |
| 1274 } | |
| 1275 } | |
| 1276 | |
| 6258 | 1277 // Handle non-dymanic manually: |
| 1278 if (dlinfo.dli_fbase != NULL && | |
| 1279 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { | |
| 1280 if(!Decoder::demangle(localbuf, buf, buflen)) { | |
| 1281 jio_snprintf(buf, buflen, "%s", localbuf); | |
| 1282 } | |
| 1283 return true; | |
| 1284 } | |
| 3960 | 1285 if (buf != NULL) buf[0] = '\0'; |
| 1286 if (offset != NULL) *offset = -1; | |
| 1287 return false; | |
| 1288 } | |
| 1289 | |
| 1290 // ported from solaris version | |
| 1291 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1292 int buflen, int* offset) { | |
| 1293 Dl_info dlinfo; | |
| 1294 | |
| 1295 if (dladdr((void*)addr, &dlinfo)){ | |
| 1296 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
| 1297 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
| 1298 return true; | |
| 1299 } else { | |
| 1300 if (buf) buf[0] = '\0'; | |
| 1301 if (offset) *offset = -1; | |
| 1302 return false; | |
| 1303 } | |
| 1304 } | |
| 6918 | 1305 |
| 1306 // Loads .dll/.so and | |
| 1307 // in case of error it checks if .dll/.so was built for the | |
| 1308 // same architecture as Hotspot is running on | |
| 3960 | 1309 |
| 1310 #ifdef __APPLE__ | |
| 1311 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
| 1312 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1313 if (result != NULL) { | |
| 1314 // Successful loading | |
| 1315 return result; | |
| 1316 } | |
| 1317 | |
| 1318 // Read system error message into ebuf | |
| 1319 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1320 ebuf[ebuflen-1]='\0'; | |
| 1321 | |
| 1322 return NULL; | |
| 1323 } | |
| 1324 #else | |
| 1325 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
| 1326 { | |
| 1327 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 1328 if (result != NULL) { | |
| 1329 // Successful loading | |
| 1330 return result; | |
| 1331 } | |
| 1332 | |
| 1333 Elf32_Ehdr elf_head; | |
| 1334 | |
| 1335 // Read system error message into ebuf | |
| 1336 // It may or may not be overwritten below | |
| 1337 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 1338 ebuf[ebuflen-1]='\0'; | |
| 1339 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
| 1340 char* diag_msg_buf=ebuf+strlen(ebuf); | |
| 1341 | |
| 1342 if (diag_msg_max_length==0) { | |
| 1343 // No more space in ebuf for additional diagnostics message | |
| 1344 return NULL; | |
| 1345 } | |
| 1346 | |
| 1347 | |
| 1348 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
| 1349 | |
| 1350 if (file_descriptor < 0) { | |
| 1351 // Can't open library, report dlerror() message | |
| 1352 return NULL; | |
| 1353 } | |
| 1354 | |
| 1355 bool failed_to_read_elf_head= | |
| 1356 (sizeof(elf_head)!= | |
| 1357 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
| 1358 | |
| 1359 ::close(file_descriptor); | |
| 1360 if (failed_to_read_elf_head) { | |
| 1361 // file i/o error - report dlerror() msg | |
| 1362 return NULL; | |
| 1363 } | |
| 1364 | |
| 1365 typedef struct { | |
| 1366 Elf32_Half code; // Actual value as defined in elf.h | |
| 1367 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
| 1368 char elf_class; // 32 or 64 bit | |
| 1369 char endianess; // MSB or LSB | |
| 1370 char* name; // String representation | |
| 1371 } arch_t; | |
| 1372 | |
| 1373 #ifndef EM_486 | |
| 1374 #define EM_486 6 /* Intel 80486 */ | |
| 1375 #endif | |
| 1376 | |
| 1377 #ifndef EM_MIPS_RS3_LE | |
| 1378 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
| 1379 #endif | |
| 1380 | |
| 1381 #ifndef EM_PPC64 | |
| 1382 #define EM_PPC64 21 /* PowerPC64 */ | |
| 1383 #endif | |
| 1384 | |
| 1385 #ifndef EM_S390 | |
| 1386 #define EM_S390 22 /* IBM System/390 */ | |
| 1387 #endif | |
| 1388 | |
| 1389 #ifndef EM_IA_64 | |
| 1390 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
| 1391 #endif | |
| 1392 | |
| 1393 #ifndef EM_X86_64 | |
| 1394 #define EM_X86_64 62 /* AMD x86-64 */ | |
| 1395 #endif | |
| 1396 | |
| 1397 static const arch_t arch_array[]={ | |
| 1398 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1399 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 1400 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
| 1401 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
| 1402 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1403 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 1404 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
| 1405 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
| 1406 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
| 1407 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
| 1408 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
| 1409 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
| 1410 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
| 1411 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
| 1412 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
| 1413 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
| 1414 }; | |
| 1415 | |
| 1416 #if (defined IA32) | |
| 1417 static Elf32_Half running_arch_code=EM_386; | |
| 1418 #elif (defined AMD64) | |
| 1419 static Elf32_Half running_arch_code=EM_X86_64; | |
| 1420 #elif (defined IA64) | |
| 1421 static Elf32_Half running_arch_code=EM_IA_64; | |
| 1422 #elif (defined __sparc) && (defined _LP64) | |
| 1423 static Elf32_Half running_arch_code=EM_SPARCV9; | |
| 1424 #elif (defined __sparc) && (!defined _LP64) | |
| 1425 static Elf32_Half running_arch_code=EM_SPARC; | |
| 1426 #elif (defined __powerpc64__) | |
| 1427 static Elf32_Half running_arch_code=EM_PPC64; | |
| 1428 #elif (defined __powerpc__) | |
| 1429 static Elf32_Half running_arch_code=EM_PPC; | |
| 1430 #elif (defined ARM) | |
| 1431 static Elf32_Half running_arch_code=EM_ARM; | |
| 1432 #elif (defined S390) | |
| 1433 static Elf32_Half running_arch_code=EM_S390; | |
| 1434 #elif (defined ALPHA) | |
| 1435 static Elf32_Half running_arch_code=EM_ALPHA; | |
| 1436 #elif (defined MIPSEL) | |
| 1437 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
| 1438 #elif (defined PARISC) | |
| 1439 static Elf32_Half running_arch_code=EM_PARISC; | |
| 1440 #elif (defined MIPS) | |
| 1441 static Elf32_Half running_arch_code=EM_MIPS; | |
| 1442 #elif (defined M68K) | |
| 1443 static Elf32_Half running_arch_code=EM_68K; | |
| 1444 #else | |
| 1445 #error Method os::dll_load requires that one of following is defined:\ | |
| 1446 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
| 1447 #endif | |
| 1448 | |
| 1449 // Identify compatability class for VM's architecture and library's architecture | |
| 1450 // Obtain string descriptions for architectures | |
| 1451 | |
| 1452 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
| 1453 int running_arch_index=-1; | |
| 1454 | |
| 1455 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
| 1456 if (running_arch_code == arch_array[i].code) { | |
| 1457 running_arch_index = i; | |
| 1458 } | |
| 1459 if (lib_arch.code == arch_array[i].code) { | |
| 1460 lib_arch.compat_class = arch_array[i].compat_class; | |
| 1461 lib_arch.name = arch_array[i].name; | |
| 1462 } | |
| 1463 } | |
| 1464 | |
| 1465 assert(running_arch_index != -1, | |
| 1466 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
| 1467 if (running_arch_index == -1) { | |
| 1468 // Even though running architecture detection failed | |
| 1469 // we may still continue with reporting dlerror() message | |
| 1470 return NULL; | |
| 1471 } | |
| 1472 | |
| 1473 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
| 1474 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
| 1475 return NULL; | |
| 1476 } | |
| 1477 | |
| 1478 #ifndef S390 | |
| 1479 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
| 1480 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
| 1481 return NULL; | |
| 1482 } | |
| 1483 #endif // !S390 | |
| 1484 | |
| 1485 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
| 1486 if ( lib_arch.name!=NULL ) { | |
| 1487 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1488 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
| 1489 lib_arch.name, arch_array[running_arch_index].name); | |
| 1490 } else { | |
| 1491 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 1492 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
| 1493 lib_arch.code, | |
| 1494 arch_array[running_arch_index].name); | |
| 1495 } | |
| 1496 } | |
| 1497 | |
| 1498 return NULL; | |
| 1499 } | |
| 1500 #endif /* !__APPLE__ */ | |
| 1501 | |
| 1502 // XXX: Do we need a lock around this as per Linux? | |
| 1503 void* os::dll_lookup(void* handle, const char* name) { | |
| 1504 return dlsym(handle, name); | |
| 1505 } | |
| 1506 | |
| 1507 | |
| 1508 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
| 1509 int fd = ::open(filename, O_RDONLY); | |
| 1510 if (fd == -1) { | |
| 1511 return false; | |
| 1512 } | |
| 1513 | |
| 1514 char buf[32]; | |
| 1515 int bytes; | |
| 1516 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
| 1517 st->print_raw(buf, bytes); | |
| 1518 } | |
| 1519 | |
| 1520 ::close(fd); | |
| 1521 | |
| 1522 return true; | |
| 1523 } | |
| 1524 | |
| 1525 void os::print_dll_info(outputStream *st) { | |
| 1526 st->print_cr("Dynamic libraries:"); | |
| 1527 #ifdef RTLD_DI_LINKMAP | |
| 1528 Dl_info dli; | |
| 1529 void *handle; | |
| 1530 Link_map *map; | |
| 1531 Link_map *p; | |
| 1532 | |
| 1533 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { | |
| 1534 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1535 return; | |
| 1536 } | |
| 1537 handle = dlopen(dli.dli_fname, RTLD_LAZY); | |
| 1538 if (handle == NULL) { | |
| 1539 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1540 return; | |
| 1541 } | |
| 1542 dlinfo(handle, RTLD_DI_LINKMAP, &map); | |
| 1543 if (map == NULL) { | |
| 1544 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1545 return; | |
| 1546 } | |
| 1547 | |
| 1548 while (map->l_prev != NULL) | |
| 1549 map = map->l_prev; | |
| 1550 | |
| 1551 while (map != NULL) { | |
| 1552 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); | |
| 1553 map = map->l_next; | |
| 1554 } | |
| 1555 | |
| 1556 dlclose(handle); | |
| 1557 #elif defined(__APPLE__) | |
| 1558 uint32_t count; | |
| 1559 uint32_t i; | |
| 1560 | |
| 1561 count = _dyld_image_count(); | |
| 1562 for (i = 1; i < count; i++) { | |
| 1563 const char *name = _dyld_get_image_name(i); | |
| 1564 intptr_t slide = _dyld_get_image_vmaddr_slide(i); | |
| 1565 st->print_cr(PTR_FORMAT " \t%s", slide, name); | |
| 1566 } | |
| 1567 #else | |
| 1568 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 1569 #endif | |
| 1570 } | |
| 1571 | |
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1572 void os::print_os_info_brief(outputStream* st) { |
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1573 st->print("Bsd"); |
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1574 |
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1575 os::Posix::print_uname_info(st); |
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1576 } |
| 3960 | 1577 |
| 1578 void os::print_os_info(outputStream* st) { | |
| 1579 st->print("OS:"); | |
|
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1580 st->print("Bsd"); |
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1581 |
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1582 os::Posix::print_uname_info(st); |
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1583 |
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1584 os::Posix::print_rlimit_info(st); |
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1585 |
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1586 os::Posix::print_load_average(st); |
| 3960 | 1587 } |
| 1588 | |
| 1589 void os::pd_print_cpu_info(outputStream* st) { | |
| 1590 // Nothing to do for now. | |
| 1591 } | |
| 1592 | |
| 1593 void os::print_memory_info(outputStream* st) { | |
| 1594 | |
| 1595 st->print("Memory:"); | |
| 1596 st->print(" %dk page", os::vm_page_size()>>10); | |
| 1597 | |
| 1598 st->print(", physical " UINT64_FORMAT "k", | |
| 1599 os::physical_memory() >> 10); | |
| 1600 st->print("(" UINT64_FORMAT "k free)", | |
| 1601 os::available_memory() >> 10); | |
| 1602 st->cr(); | |
| 1603 | |
| 1604 // meminfo | |
| 1605 st->print("\n/proc/meminfo:\n"); | |
| 1606 _print_ascii_file("/proc/meminfo", st); | |
| 1607 st->cr(); | |
| 1608 } | |
| 1609 | |
| 1610 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
| 1611 // but they're the same for all the bsd arch that we support | |
| 1612 // and they're the same for solaris but there's no common place to put this. | |
| 1613 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
| 1614 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
| 1615 "ILL_COPROC", "ILL_BADSTK" }; | |
| 1616 | |
| 1617 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
| 1618 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
| 1619 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
| 1620 | |
| 1621 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
| 1622 | |
| 1623 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
| 1624 | |
| 1625 void os::print_siginfo(outputStream* st, void* siginfo) { | |
| 1626 st->print("siginfo:"); | |
| 1627 | |
| 1628 const int buflen = 100; | |
| 1629 char buf[buflen]; | |
| 1630 siginfo_t *si = (siginfo_t*)siginfo; | |
| 1631 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
| 1632 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
| 1633 st->print("si_errno=%s", buf); | |
| 1634 } else { | |
| 1635 st->print("si_errno=%d", si->si_errno); | |
| 1636 } | |
| 1637 const int c = si->si_code; | |
| 1638 assert(c > 0, "unexpected si_code"); | |
| 1639 switch (si->si_signo) { | |
| 1640 case SIGILL: | |
| 1641 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
| 1642 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1643 break; | |
| 1644 case SIGFPE: | |
| 1645 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
| 1646 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1647 break; | |
| 1648 case SIGSEGV: | |
| 1649 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
| 1650 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1651 break; | |
| 1652 case SIGBUS: | |
| 1653 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
| 1654 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 1655 break; | |
| 1656 default: | |
| 1657 st->print(", si_code=%d", si->si_code); | |
| 1658 // no si_addr | |
| 1659 } | |
| 1660 | |
| 1661 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
| 1662 UseSharedSpaces) { | |
| 1663 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 1664 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
| 1665 st->print("\n\nError accessing class data sharing archive." \ | |
| 1666 " Mapped file inaccessible during execution, " \ | |
| 1667 " possible disk/network problem."); | |
| 1668 } | |
| 1669 } | |
| 1670 st->cr(); | |
| 1671 } | |
| 1672 | |
| 1673 | |
| 1674 static void print_signal_handler(outputStream* st, int sig, | |
| 1675 char* buf, size_t buflen); | |
| 1676 | |
| 1677 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 1678 st->print_cr("Signal Handlers:"); | |
| 1679 print_signal_handler(st, SIGSEGV, buf, buflen); | |
| 1680 print_signal_handler(st, SIGBUS , buf, buflen); | |
| 1681 print_signal_handler(st, SIGFPE , buf, buflen); | |
| 1682 print_signal_handler(st, SIGPIPE, buf, buflen); | |
| 1683 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
| 1684 print_signal_handler(st, SIGILL , buf, buflen); | |
| 1685 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
| 1686 print_signal_handler(st, SR_signum, buf, buflen); | |
| 1687 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
| 1688 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
| 1689 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
| 1690 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
| 1691 } | |
| 1692 | |
| 1693 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
| 1694 | |
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1695 // Find the full path to the current module, libjvm |
| 3960 | 1696 void os::jvm_path(char *buf, jint buflen) { |
| 1697 // Error checking. | |
| 1698 if (buflen < MAXPATHLEN) { | |
| 1699 assert(false, "must use a large-enough buffer"); | |
| 1700 buf[0] = '\0'; | |
| 1701 return; | |
| 1702 } | |
| 1703 // Lazy resolve the path to current module. | |
| 1704 if (saved_jvm_path[0] != 0) { | |
| 1705 strcpy(buf, saved_jvm_path); | |
| 1706 return; | |
| 1707 } | |
| 1708 | |
| 1709 char dli_fname[MAXPATHLEN]; | |
| 1710 bool ret = dll_address_to_library_name( | |
| 1711 CAST_FROM_FN_PTR(address, os::jvm_path), | |
| 1712 dli_fname, sizeof(dli_fname), NULL); | |
| 1713 assert(ret != 0, "cannot locate libjvm"); | |
| 1714 char *rp = realpath(dli_fname, buf); | |
| 1715 if (rp == NULL) | |
| 1716 return; | |
| 1717 | |
| 1718 if (Arguments::created_by_gamma_launcher()) { | |
| 1719 // Support for the gamma launcher. Typical value for buf is | |
| 4846 | 1720 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
| 3960 | 1721 // the right place in the string, then assume we are installed in a JDK and |
| 4846 | 1722 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
| 1723 // construct a path to the JVM being overridden. | |
| 1724 | |
| 3960 | 1725 const char *p = buf + strlen(buf) - 1; |
| 1726 for (int count = 0; p > buf && count < 5; ++count) { | |
| 1727 for (--p; p > buf && *p != '/'; --p) | |
| 1728 /* empty */ ; | |
| 1729 } | |
| 1730 | |
| 1731 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
| 1732 // Look for JAVA_HOME in the environment. | |
| 1733 char* java_home_var = ::getenv("JAVA_HOME"); | |
| 1734 if (java_home_var != NULL && java_home_var[0] != 0) { | |
| 1735 char* jrelib_p; | |
| 1736 int len; | |
| 1737 | |
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1738 // Check the current module name "libjvm" |
| 3960 | 1739 p = strrchr(buf, '/'); |
| 1740 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
| 1741 | |
| 1742 rp = realpath(java_home_var, buf); | |
| 1743 if (rp == NULL) | |
| 1744 return; | |
| 1745 | |
| 1746 // determine if this is a legacy image or modules image | |
| 1747 // modules image doesn't have "jre" subdirectory | |
| 1748 len = strlen(buf); | |
| 1749 jrelib_p = buf + len; | |
| 4846 | 1750 |
| 1751 // Add the appropriate library subdir | |
| 1752 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
| 3960 | 1753 if (0 != access(buf, F_OK)) { |
| 4846 | 1754 snprintf(jrelib_p, buflen-len, "/lib"); |
| 3960 | 1755 } |
| 1756 | |
| 4846 | 1757 // Add the appropriate client or server subdir |
| 1758 len = strlen(buf); | |
| 1759 jrelib_p = buf + len; | |
| 1760 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
| 1761 if (0 != access(buf, F_OK)) { | |
| 1762 snprintf(jrelib_p, buflen-len, ""); | |
| 1763 } | |
| 1764 | |
| 1765 // If the path exists within JAVA_HOME, add the JVM library name | |
| 1766 // to complete the path to JVM being overridden. Otherwise fallback | |
| 1767 // to the path to the current library. | |
| 3960 | 1768 if (0 == access(buf, F_OK)) { |
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1769 // Use current module name "libjvm" |
| 3960 | 1770 len = strlen(buf); |
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1771 snprintf(buf + len, buflen-len, "/libjvm%s", JNI_LIB_SUFFIX); |
| 3960 | 1772 } else { |
| 4846 | 1773 // Fall back to path of current library |
| 3960 | 1774 rp = realpath(dli_fname, buf); |
| 1775 if (rp == NULL) | |
| 1776 return; | |
| 1777 } | |
| 1778 } | |
| 1779 } | |
| 1780 } | |
| 1781 | |
| 1782 strcpy(saved_jvm_path, buf); | |
| 1783 } | |
| 1784 | |
| 1785 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 1786 // no prefix required, not even "_" | |
| 1787 } | |
| 1788 | |
| 1789 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 1790 // no suffix required | |
| 1791 } | |
| 1792 | |
| 1793 //////////////////////////////////////////////////////////////////////////////// | |
| 1794 // sun.misc.Signal support | |
| 1795 | |
| 1796 static volatile jint sigint_count = 0; | |
| 1797 | |
| 1798 static void | |
| 1799 UserHandler(int sig, void *siginfo, void *context) { | |
| 1800 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
| 1801 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
| 1802 // don't want to flood the manager thread with sem_post requests. | |
| 1803 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
| 1804 return; | |
| 1805 | |
| 1806 // Ctrl-C is pressed during error reporting, likely because the error | |
| 1807 // handler fails to abort. Let VM die immediately. | |
| 1808 if (sig == SIGINT && is_error_reported()) { | |
| 1809 os::die(); | |
| 1810 } | |
| 1811 | |
| 1812 os::signal_notify(sig); | |
| 1813 } | |
| 1814 | |
| 1815 void* os::user_handler() { | |
| 1816 return CAST_FROM_FN_PTR(void*, UserHandler); | |
| 1817 } | |
| 1818 | |
| 1819 extern "C" { | |
| 1820 typedef void (*sa_handler_t)(int); | |
| 1821 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
| 1822 } | |
| 1823 | |
| 1824 void* os::signal(int signal_number, void* handler) { | |
| 1825 struct sigaction sigAct, oldSigAct; | |
| 1826 | |
| 1827 sigfillset(&(sigAct.sa_mask)); | |
| 1828 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 1829 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
| 1830 | |
| 1831 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
| 1832 // -1 means registration failed | |
| 1833 return (void *)-1; | |
| 1834 } | |
| 1835 | |
| 1836 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
| 1837 } | |
| 1838 | |
| 1839 void os::signal_raise(int signal_number) { | |
| 1840 ::raise(signal_number); | |
| 1841 } | |
| 1842 | |
| 1843 /* | |
| 1844 * The following code is moved from os.cpp for making this | |
| 1845 * code platform specific, which it is by its very nature. | |
| 1846 */ | |
| 1847 | |
| 1848 // Will be modified when max signal is changed to be dynamic | |
| 1849 int os::sigexitnum_pd() { | |
| 1850 return NSIG; | |
| 1851 } | |
| 1852 | |
| 1853 // a counter for each possible signal value | |
| 1854 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 1855 | |
| 1856 // Bsd(POSIX) specific hand shaking semaphore. | |
| 1857 #ifdef __APPLE__ | |
| 1858 static semaphore_t sig_sem; | |
| 1859 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) | |
| 1860 #define SEM_WAIT(sem) semaphore_wait(sem); | |
| 1861 #define SEM_POST(sem) semaphore_signal(sem); | |
| 1862 #else | |
| 1863 static sem_t sig_sem; | |
| 1864 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) | |
| 1865 #define SEM_WAIT(sem) sem_wait(&sem); | |
| 1866 #define SEM_POST(sem) sem_post(&sem); | |
| 1867 #endif | |
| 1868 | |
| 1869 void os::signal_init_pd() { | |
| 1870 // Initialize signal structures | |
| 1871 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 1872 | |
| 1873 // Initialize signal semaphore | |
| 1874 ::SEM_INIT(sig_sem, 0); | |
| 1875 } | |
| 1876 | |
| 1877 void os::signal_notify(int sig) { | |
| 1878 Atomic::inc(&pending_signals[sig]); | |
| 1879 ::SEM_POST(sig_sem); | |
| 1880 } | |
| 1881 | |
| 1882 static int check_pending_signals(bool wait) { | |
| 1883 Atomic::store(0, &sigint_count); | |
| 1884 for (;;) { | |
| 1885 for (int i = 0; i < NSIG + 1; i++) { | |
| 1886 jint n = pending_signals[i]; | |
| 1887 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 1888 return i; | |
| 1889 } | |
| 1890 } | |
| 1891 if (!wait) { | |
| 1892 return -1; | |
| 1893 } | |
| 1894 JavaThread *thread = JavaThread::current(); | |
| 1895 ThreadBlockInVM tbivm(thread); | |
| 1896 | |
| 1897 bool threadIsSuspended; | |
| 1898 do { | |
| 1899 thread->set_suspend_equivalent(); | |
| 1900 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 1901 ::SEM_WAIT(sig_sem); | |
| 1902 | |
| 1903 // were we externally suspended while we were waiting? | |
| 1904 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 1905 if (threadIsSuspended) { | |
| 1906 // | |
| 1907 // The semaphore has been incremented, but while we were waiting | |
| 1908 // another thread suspended us. We don't want to continue running | |
| 1909 // while suspended because that would surprise the thread that | |
| 1910 // suspended us. | |
| 1911 // | |
| 1912 ::SEM_POST(sig_sem); | |
| 1913 | |
| 1914 thread->java_suspend_self(); | |
| 1915 } | |
| 1916 } while (threadIsSuspended); | |
| 1917 } | |
| 1918 } | |
| 1919 | |
| 1920 int os::signal_lookup() { | |
| 1921 return check_pending_signals(false); | |
| 1922 } | |
| 1923 | |
| 1924 int os::signal_wait() { | |
| 1925 return check_pending_signals(true); | |
| 1926 } | |
| 1927 | |
| 1928 //////////////////////////////////////////////////////////////////////////////// | |
| 1929 // Virtual Memory | |
| 1930 | |
| 1931 int os::vm_page_size() { | |
| 1932 // Seems redundant as all get out | |
| 1933 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 1934 return os::Bsd::page_size(); | |
| 1935 } | |
| 1936 | |
| 1937 // Solaris allocates memory by pages. | |
| 1938 int os::vm_allocation_granularity() { | |
| 1939 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 1940 return os::Bsd::page_size(); | |
| 1941 } | |
| 1942 | |
| 1943 // Rationale behind this function: | |
| 1944 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
| 1945 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
| 1946 // samples for JITted code. Here we create private executable mapping over the code cache | |
| 1947 // and then we can use standard (well, almost, as mapping can change) way to provide | |
| 1948 // info for the reporting script by storing timestamp and location of symbol | |
| 1949 void bsd_wrap_code(char* base, size_t size) { | |
| 1950 static volatile jint cnt = 0; | |
| 1951 | |
| 1952 if (!UseOprofile) { | |
| 1953 return; | |
| 1954 } | |
| 1955 | |
| 1956 char buf[PATH_MAX + 1]; | |
| 1957 int num = Atomic::add(1, &cnt); | |
| 1958 | |
| 1959 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
| 1960 os::get_temp_directory(), os::current_process_id(), num); | |
| 1961 unlink(buf); | |
| 1962 | |
| 1963 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
| 1964 | |
| 1965 if (fd != -1) { | |
| 1966 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
| 1967 if (rv != (off_t)-1) { | |
| 1968 if (::write(fd, "", 1) == 1) { | |
| 1969 mmap(base, size, | |
| 1970 PROT_READ|PROT_WRITE|PROT_EXEC, | |
| 1971 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
| 1972 } | |
| 1973 } | |
| 1974 ::close(fd); | |
| 1975 unlink(buf); | |
| 1976 } | |
| 1977 } | |
| 1978 | |
| 1979 // NOTE: Bsd kernel does not really reserve the pages for us. | |
| 1980 // All it does is to check if there are enough free pages | |
| 1981 // left at the time of mmap(). This could be a potential | |
| 1982 // problem. | |
| 6197 | 1983 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| 3960 | 1984 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| 1985 #ifdef __OpenBSD__ | |
| 1986 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 1987 return ::mprotect(addr, size, prot) == 0; | |
| 1988 #else | |
| 1989 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
| 1990 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
| 1991 return res != (uintptr_t) MAP_FAILED; | |
| 1992 #endif | |
| 1993 } | |
| 1994 | |
| 1995 | |
| 6197 | 1996 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| 3960 | 1997 bool exec) { |
| 1998 return commit_memory(addr, size, exec); | |
| 1999 } | |
| 2000 | |
| 6197 | 2001 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2002 } |
| 2003 | |
| 6197 | 2004 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2005 ::madvise(addr, bytes, MADV_DONTNEED); |
| 2006 } | |
| 2007 | |
| 2008 void os::numa_make_global(char *addr, size_t bytes) { | |
| 2009 } | |
| 2010 | |
| 2011 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
| 2012 } | |
| 2013 | |
| 2014 bool os::numa_topology_changed() { return false; } | |
| 2015 | |
| 2016 size_t os::numa_get_groups_num() { | |
| 2017 return 1; | |
| 2018 } | |
| 2019 | |
| 2020 int os::numa_get_group_id() { | |
| 2021 return 0; | |
| 2022 } | |
| 2023 | |
| 2024 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
| 2025 if (size > 0) { | |
| 2026 ids[0] = 0; | |
| 2027 return 1; | |
| 2028 } | |
| 2029 return 0; | |
| 2030 } | |
| 2031 | |
| 2032 bool os::get_page_info(char *start, page_info* info) { | |
| 2033 return false; | |
| 2034 } | |
| 2035 | |
| 2036 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2037 return end; | |
| 2038 } | |
| 2039 | |
| 2040 | |
| 6197 | 2041 bool os::pd_uncommit_memory(char* addr, size_t size) { |
| 3960 | 2042 #ifdef __OpenBSD__ |
| 2043 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 2044 return ::mprotect(addr, size, PROT_NONE) == 0; | |
| 2045 #else | |
| 2046 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
| 2047 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
| 2048 return res != (uintptr_t) MAP_FAILED; | |
| 2049 #endif | |
| 2050 } | |
| 2051 | |
| 6197 | 2052 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
| 3960 | 2053 return os::commit_memory(addr, size); |
| 2054 } | |
| 2055 | |
| 2056 // If this is a growable mapping, remove the guard pages entirely by | |
| 2057 // munmap()ping them. If not, just call uncommit_memory(). | |
| 2058 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
| 2059 return os::uncommit_memory(addr, size); | |
| 2060 } | |
| 2061 | |
| 2062 static address _highest_vm_reserved_address = NULL; | |
| 2063 | |
| 2064 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
| 2065 // at 'requested_addr'. If there are existing memory mappings at the same | |
| 2066 // location, however, they will be overwritten. If 'fixed' is false, | |
| 2067 // 'requested_addr' is only treated as a hint, the return value may or | |
| 2068 // may not start from the requested address. Unlike Bsd mmap(), this | |
| 2069 // function returns NULL to indicate failure. | |
| 2070 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
| 2071 char * addr; | |
| 2072 int flags; | |
| 2073 | |
| 2074 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
| 2075 if (fixed) { | |
| 2076 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
| 2077 flags |= MAP_FIXED; | |
| 2078 } | |
| 2079 | |
| 2080 // Map uncommitted pages PROT_READ and PROT_WRITE, change access | |
| 2081 // to PROT_EXEC if executable when we commit the page. | |
| 2082 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, | |
| 2083 flags, -1, 0); | |
| 2084 | |
| 2085 if (addr != MAP_FAILED) { | |
| 2086 // anon_mmap() should only get called during VM initialization, | |
| 2087 // don't need lock (actually we can skip locking even it can be called | |
| 2088 // from multiple threads, because _highest_vm_reserved_address is just a | |
| 2089 // hint about the upper limit of non-stack memory regions.) | |
| 2090 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
| 2091 _highest_vm_reserved_address = (address)addr + bytes; | |
| 2092 } | |
| 2093 } | |
| 2094 | |
| 2095 return addr == MAP_FAILED ? NULL : addr; | |
| 2096 } | |
| 2097 | |
| 2098 // Don't update _highest_vm_reserved_address, because there might be memory | |
| 2099 // regions above addr + size. If so, releasing a memory region only creates | |
| 2100 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
| 2101 // | |
| 2102 static int anon_munmap(char * addr, size_t size) { | |
| 2103 return ::munmap(addr, size) == 0; | |
| 2104 } | |
| 2105 | |
| 6197 | 2106 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| 3960 | 2107 size_t alignment_hint) { |
| 2108 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
| 2109 } | |
| 2110 | |
| 6197 | 2111 bool os::pd_release_memory(char* addr, size_t size) { |
| 3960 | 2112 return anon_munmap(addr, size); |
| 2113 } | |
| 2114 | |
| 2115 static address highest_vm_reserved_address() { | |
| 2116 return _highest_vm_reserved_address; | |
| 2117 } | |
| 2118 | |
| 2119 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
| 2120 // Bsd wants the mprotect address argument to be page aligned. | |
| 2121 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
| 2122 | |
| 2123 // According to SUSv3, mprotect() should only be used with mappings | |
| 2124 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
| 2125 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
| 2126 // protection of malloc'ed or statically allocated memory). Check the | |
| 2127 // caller if you hit this assert. | |
| 2128 assert(addr == bottom, "sanity check"); | |
| 2129 | |
| 2130 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
| 2131 return ::mprotect(bottom, size, prot) == 0; | |
| 2132 } | |
| 2133 | |
| 2134 // Set protections specified | |
| 2135 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
| 2136 bool is_committed) { | |
| 2137 unsigned int p = 0; | |
| 2138 switch (prot) { | |
| 2139 case MEM_PROT_NONE: p = PROT_NONE; break; | |
| 2140 case MEM_PROT_READ: p = PROT_READ; break; | |
| 2141 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
| 2142 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
| 2143 default: | |
| 2144 ShouldNotReachHere(); | |
| 2145 } | |
| 2146 // is_committed is unused. | |
| 2147 return bsd_mprotect(addr, bytes, p); | |
| 2148 } | |
| 2149 | |
| 2150 bool os::guard_memory(char* addr, size_t size) { | |
| 2151 return bsd_mprotect(addr, size, PROT_NONE); | |
| 2152 } | |
| 2153 | |
| 2154 bool os::unguard_memory(char* addr, size_t size) { | |
| 2155 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
| 2156 } | |
| 2157 | |
| 2158 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
| 6918 | 2159 return false; |
| 3960 | 2160 } |
| 2161 | |
| 2162 /* | |
| 2163 * Set the coredump_filter bits to include largepages in core dump (bit 6) | |
| 2164 * | |
| 2165 * From the coredump_filter documentation: | |
| 2166 * | |
| 2167 * - (bit 0) anonymous private memory | |
| 2168 * - (bit 1) anonymous shared memory | |
| 2169 * - (bit 2) file-backed private memory | |
| 2170 * - (bit 3) file-backed shared memory | |
| 2171 * - (bit 4) ELF header pages in file-backed private memory areas (it is | |
| 2172 * effective only if the bit 2 is cleared) | |
| 2173 * - (bit 5) hugetlb private memory | |
| 2174 * - (bit 6) hugetlb shared memory | |
| 2175 */ | |
| 2176 static void set_coredump_filter(void) { | |
| 2177 FILE *f; | |
| 2178 long cdm; | |
| 2179 | |
| 2180 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { | |
| 2181 return; | |
| 2182 } | |
| 2183 | |
| 2184 if (fscanf(f, "%lx", &cdm) != 1) { | |
| 2185 fclose(f); | |
| 2186 return; | |
| 2187 } | |
| 2188 | |
| 2189 rewind(f); | |
| 2190 | |
| 2191 if ((cdm & LARGEPAGES_BIT) == 0) { | |
| 2192 cdm |= LARGEPAGES_BIT; | |
| 2193 fprintf(f, "%#lx", cdm); | |
| 2194 } | |
| 2195 | |
| 2196 fclose(f); | |
| 2197 } | |
| 2198 | |
| 2199 // Large page support | |
| 2200 | |
| 2201 static size_t _large_page_size = 0; | |
| 2202 | |
| 2203 void os::large_page_init() { | |
| 2204 } | |
| 2205 | |
| 2206 | |
| 2207 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { | |
| 2208 // "exec" is passed in but not used. Creating the shared image for | |
| 2209 // the code cache doesn't have an SHM_X executable permission to check. | |
| 2210 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
| 2211 | |
| 2212 key_t key = IPC_PRIVATE; | |
| 2213 char *addr; | |
| 2214 | |
| 2215 bool warn_on_failure = UseLargePages && | |
| 2216 (!FLAG_IS_DEFAULT(UseLargePages) || | |
| 2217 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
| 2218 ); | |
| 2219 char msg[128]; | |
| 2220 | |
| 2221 // Create a large shared memory region to attach to based on size. | |
| 2222 // Currently, size is the total size of the heap | |
| 2223 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
| 2224 if (shmid == -1) { | |
| 2225 // Possible reasons for shmget failure: | |
| 2226 // 1. shmmax is too small for Java heap. | |
| 2227 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
| 2228 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
| 2229 // 2. not enough large page memory. | |
| 2230 // > check available large pages: cat /proc/meminfo | |
| 2231 // > increase amount of large pages: | |
| 2232 // echo new_value > /proc/sys/vm/nr_hugepages | |
| 2233 // Note 1: different Bsd may use different name for this property, | |
| 2234 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
| 2235 // Note 2: it's possible there's enough physical memory available but | |
| 2236 // they are so fragmented after a long run that they can't | |
| 2237 // coalesce into large pages. Try to reserve large pages when | |
| 2238 // the system is still "fresh". | |
| 2239 if (warn_on_failure) { | |
| 2240 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
| 2241 warning(msg); | |
| 2242 } | |
| 2243 return NULL; | |
| 2244 } | |
| 2245 | |
| 2246 // attach to the region | |
| 2247 addr = (char*)shmat(shmid, req_addr, 0); | |
| 2248 int err = errno; | |
| 2249 | |
| 2250 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
| 2251 // will be deleted when it's detached by shmdt() or when the process | |
| 2252 // terminates. If shmat() is not successful this will remove the shared | |
| 2253 // segment immediately. | |
| 2254 shmctl(shmid, IPC_RMID, NULL); | |
| 2255 | |
| 2256 if ((intptr_t)addr == -1) { | |
| 2257 if (warn_on_failure) { | |
| 2258 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
| 2259 warning(msg); | |
| 2260 } | |
| 2261 return NULL; | |
| 2262 } | |
| 2263 | |
| 2264 return addr; | |
| 2265 } | |
| 2266 | |
| 2267 bool os::release_memory_special(char* base, size_t bytes) { | |
| 2268 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
| 2269 int rslt = shmdt(base); | |
| 2270 return rslt == 0; | |
| 2271 } | |
| 2272 | |
| 2273 size_t os::large_page_size() { | |
| 2274 return _large_page_size; | |
| 2275 } | |
| 2276 | |
| 2277 // HugeTLBFS allows application to commit large page memory on demand; | |
| 2278 // with SysV SHM the entire memory region must be allocated as shared | |
| 2279 // memory. | |
| 2280 bool os::can_commit_large_page_memory() { | |
| 2281 return UseHugeTLBFS; | |
| 2282 } | |
| 2283 | |
| 2284 bool os::can_execute_large_page_memory() { | |
| 2285 return UseHugeTLBFS; | |
| 2286 } | |
| 2287 | |
| 2288 // Reserve memory at an arbitrary address, only if that area is | |
| 2289 // available (and not reserved for something else). | |
| 2290 | |
| 6197 | 2291 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| 3960 | 2292 const int max_tries = 10; |
| 2293 char* base[max_tries]; | |
| 2294 size_t size[max_tries]; | |
| 2295 const size_t gap = 0x000000; | |
| 2296 | |
| 2297 // Assert only that the size is a multiple of the page size, since | |
| 2298 // that's all that mmap requires, and since that's all we really know | |
| 2299 // about at this low abstraction level. If we need higher alignment, | |
| 2300 // we can either pass an alignment to this method or verify alignment | |
| 2301 // in one of the methods further up the call chain. See bug 5044738. | |
| 2302 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
| 2303 | |
| 2304 // Repeatedly allocate blocks until the block is allocated at the | |
| 2305 // right spot. Give up after max_tries. Note that reserve_memory() will | |
| 2306 // automatically update _highest_vm_reserved_address if the call is | |
| 2307 // successful. The variable tracks the highest memory address every reserved | |
| 2308 // by JVM. It is used to detect heap-stack collision if running with | |
| 2309 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
| 2310 // space than needed, it could confuse the collision detecting code. To | |
| 2311 // solve the problem, save current _highest_vm_reserved_address and | |
| 2312 // calculate the correct value before return. | |
| 2313 address old_highest = _highest_vm_reserved_address; | |
| 2314 | |
| 2315 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
| 2316 // if kernel honors the hint then we can return immediately. | |
| 2317 char * addr = anon_mmap(requested_addr, bytes, false); | |
| 2318 if (addr == requested_addr) { | |
| 2319 return requested_addr; | |
| 2320 } | |
| 2321 | |
| 2322 if (addr != NULL) { | |
| 2323 // mmap() is successful but it fails to reserve at the requested address | |
| 2324 anon_munmap(addr, bytes); | |
| 2325 } | |
| 2326 | |
| 2327 int i; | |
| 2328 for (i = 0; i < max_tries; ++i) { | |
| 2329 base[i] = reserve_memory(bytes); | |
| 2330 | |
| 2331 if (base[i] != NULL) { | |
| 2332 // Is this the block we wanted? | |
| 2333 if (base[i] == requested_addr) { | |
| 2334 size[i] = bytes; | |
| 2335 break; | |
| 2336 } | |
| 2337 | |
| 2338 // Does this overlap the block we wanted? Give back the overlapped | |
| 2339 // parts and try again. | |
| 2340 | |
| 2341 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
| 2342 if (top_overlap >= 0 && top_overlap < bytes) { | |
| 2343 unmap_memory(base[i], top_overlap); | |
| 2344 base[i] += top_overlap; | |
| 2345 size[i] = bytes - top_overlap; | |
| 2346 } else { | |
| 2347 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
| 2348 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
| 2349 unmap_memory(requested_addr, bottom_overlap); | |
| 2350 size[i] = bytes - bottom_overlap; | |
| 2351 } else { | |
| 2352 size[i] = bytes; | |
| 2353 } | |
| 2354 } | |
| 2355 } | |
| 2356 } | |
| 2357 | |
| 2358 // Give back the unused reserved pieces. | |
| 2359 | |
| 2360 for (int j = 0; j < i; ++j) { | |
| 2361 if (base[j] != NULL) { | |
| 2362 unmap_memory(base[j], size[j]); | |
| 2363 } | |
| 2364 } | |
| 2365 | |
| 2366 if (i < max_tries) { | |
| 2367 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
| 2368 return requested_addr; | |
| 2369 } else { | |
| 2370 _highest_vm_reserved_address = old_highest; | |
| 2371 return NULL; | |
| 2372 } | |
| 2373 } | |
| 2374 | |
| 2375 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 2376 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
| 2377 } | |
| 2378 | |
| 2379 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
| 2380 // Solaris uses poll(), bsd uses park(). | |
| 2381 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
| 2382 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
| 2383 // SIGSEGV, see 4355769. | |
| 2384 | |
| 2385 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
| 2386 assert(thread == Thread::current(), "thread consistency check"); | |
| 2387 | |
| 2388 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2389 slp->reset() ; | |
| 2390 OrderAccess::fence() ; | |
| 2391 | |
| 2392 if (interruptible) { | |
| 2393 jlong prevtime = javaTimeNanos(); | |
| 2394 | |
| 2395 for (;;) { | |
| 2396 if (os::is_interrupted(thread, true)) { | |
| 2397 return OS_INTRPT; | |
| 2398 } | |
| 2399 | |
| 2400 jlong newtime = javaTimeNanos(); | |
| 2401 | |
| 2402 if (newtime - prevtime < 0) { | |
| 2403 // time moving backwards, should only happen if no monotonic clock | |
| 2404 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2405 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2406 } else { | |
|
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2407 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2408 } |
| 2409 | |
| 2410 if(millis <= 0) { | |
| 2411 return OS_OK; | |
| 2412 } | |
| 2413 | |
| 2414 prevtime = newtime; | |
| 2415 | |
| 2416 { | |
| 2417 assert(thread->is_Java_thread(), "sanity check"); | |
| 2418 JavaThread *jt = (JavaThread *) thread; | |
| 2419 ThreadBlockInVM tbivm(jt); | |
| 2420 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
| 2421 | |
| 2422 jt->set_suspend_equivalent(); | |
| 2423 // cleared by handle_special_suspend_equivalent_condition() or | |
| 2424 // java_suspend_self() via check_and_wait_while_suspended() | |
| 2425 | |
| 2426 slp->park(millis); | |
| 2427 | |
| 2428 // were we externally suspended while we were waiting? | |
| 2429 jt->check_and_wait_while_suspended(); | |
| 2430 } | |
| 2431 } | |
| 2432 } else { | |
| 2433 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 2434 jlong prevtime = javaTimeNanos(); | |
| 2435 | |
| 2436 for (;;) { | |
| 2437 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
| 2438 // the 1st iteration ... | |
| 2439 jlong newtime = javaTimeNanos(); | |
| 2440 | |
| 2441 if (newtime - prevtime < 0) { | |
| 2442 // time moving backwards, should only happen if no monotonic clock | |
| 2443 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 2444 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 2445 } else { | |
|
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2446 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 2447 } |
| 2448 | |
| 2449 if(millis <= 0) break ; | |
| 2450 | |
| 2451 prevtime = newtime; | |
| 2452 slp->park(millis); | |
| 2453 } | |
| 2454 return OS_OK ; | |
| 2455 } | |
| 2456 } | |
| 2457 | |
| 2458 int os::naked_sleep() { | |
| 2459 // %% make the sleep time an integer flag. for now use 1 millisec. | |
| 2460 return os::sleep(Thread::current(), 1, false); | |
| 2461 } | |
| 2462 | |
| 2463 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 2464 void os::infinite_sleep() { | |
| 2465 while (true) { // sleep forever ... | |
| 2466 ::sleep(100); // ... 100 seconds at a time | |
| 2467 } | |
| 2468 } | |
| 2469 | |
| 2470 // Used to convert frequent JVM_Yield() to nops | |
| 2471 bool os::dont_yield() { | |
| 2472 return DontYieldALot; | |
| 2473 } | |
| 2474 | |
| 2475 void os::yield() { | |
| 2476 sched_yield(); | |
| 2477 } | |
| 2478 | |
| 2479 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
| 2480 | |
| 2481 void os::yield_all(int attempts) { | |
| 2482 // Yields to all threads, including threads with lower priorities | |
| 2483 // Threads on Bsd are all with same priority. The Solaris style | |
| 2484 // os::yield_all() with nanosleep(1ms) is not necessary. | |
| 2485 sched_yield(); | |
| 2486 } | |
| 2487 | |
| 2488 // Called from the tight loops to possibly influence time-sharing heuristics | |
| 2489 void os::loop_breaker(int attempts) { | |
| 2490 os::yield_all(attempts); | |
| 2491 } | |
| 2492 | |
| 2493 //////////////////////////////////////////////////////////////////////////////// | |
| 2494 // thread priority support | |
| 2495 | |
| 2496 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
| 2497 // only supports dynamic priority, static priority must be zero. For real-time | |
| 2498 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
| 2499 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
| 2500 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
| 2501 // of 5 runs - Sep 2005). | |
| 2502 // | |
| 2503 // The following code actually changes the niceness of kernel-thread/LWP. It | |
| 2504 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
| 2505 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
| 2506 // threads. It has always been the case, but could change in the future. For | |
| 2507 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
| 2508 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
| 2509 | |
| 6918 | 2510 #if !defined(__APPLE__) |
|
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2511 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2512 19, // 0 Entry should never be used |
| 2513 | |
| 2514 0, // 1 MinPriority | |
| 2515 3, // 2 | |
| 2516 6, // 3 | |
| 2517 | |
|
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2518 10, // 4 |
|
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2519 15, // 5 NormPriority |
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2520 18, // 6 |
|
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2521 |
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2522 21, // 7 |
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2523 25, // 8 |
|
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2524 28, // 9 NearMaxPriority |
|
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2525 |
|
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2526 31, // 10 MaxPriority |
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2527 |
|
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|
2528 31 // 11 CriticalPriority |
| 3960 | 2529 }; |
| 6918 | 2530 #else |
| 3960 | 2531 /* Using Mach high-level priority assignments */ |
|
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|
2532 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 2533 0, // 0 Entry should never be used (MINPRI_USER) |
| 2534 | |
| 2535 27, // 1 MinPriority | |
| 2536 28, // 2 | |
| 2537 29, // 3 | |
| 2538 | |
| 2539 30, // 4 | |
| 2540 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
| 2541 32, // 6 | |
| 2542 | |
| 2543 33, // 7 | |
| 2544 34, // 8 | |
| 2545 35, // 9 NearMaxPriority | |
| 2546 | |
|
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2547 36, // 10 MaxPriority |
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2548 |
|
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|
2549 36 // 11 CriticalPriority |
| 3960 | 2550 }; |
| 2551 #endif | |
| 2552 | |
| 2553 static int prio_init() { | |
| 2554 if (ThreadPriorityPolicy == 1) { | |
| 2555 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
| 2556 // if effective uid is not root. Perhaps, a more elegant way of doing | |
| 2557 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
| 2558 if (geteuid() != 0) { | |
| 2559 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
| 2560 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
| 2561 } | |
| 2562 ThreadPriorityPolicy = 0; | |
| 2563 } | |
| 2564 } | |
|
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|
2565 if (UseCriticalJavaThreadPriority) { |
|
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2566 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
|
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|
2567 } |
| 3960 | 2568 return 0; |
| 2569 } | |
| 2570 | |
| 2571 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
| 2572 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
| 2573 | |
| 2574 #ifdef __OpenBSD__ | |
| 2575 // OpenBSD pthread_setprio starves low priority threads | |
| 2576 return OS_OK; | |
| 2577 #elif defined(__FreeBSD__) | |
| 2578 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
| 2579 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2580 struct sched_param sp; | |
| 2581 int policy; | |
| 2582 pthread_t self = pthread_self(); | |
| 2583 | |
| 2584 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
| 2585 return OS_ERR; | |
| 2586 | |
| 2587 sp.sched_priority = newpri; | |
| 2588 if (pthread_setschedparam(self, policy, &sp) != 0) | |
| 2589 return OS_ERR; | |
| 2590 | |
| 2591 return OS_OK; | |
| 2592 #else | |
| 2593 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
| 2594 return (ret == 0) ? OS_OK : OS_ERR; | |
| 2595 #endif | |
| 2596 } | |
| 2597 | |
| 2598 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
| 2599 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
| 2600 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 2601 return OS_OK; | |
| 2602 } | |
| 2603 | |
| 2604 errno = 0; | |
| 2605 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
| 2606 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
| 2607 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 2608 int policy; | |
| 2609 struct sched_param sp; | |
| 2610 | |
| 2611 pthread_getschedparam(pthread_self(), &policy, &sp); | |
| 2612 *priority_ptr = sp.sched_priority; | |
| 2613 #else | |
| 2614 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
| 2615 #endif | |
| 2616 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
| 2617 } | |
| 2618 | |
| 2619 // Hint to the underlying OS that a task switch would not be good. | |
| 2620 // Void return because it's a hint and can fail. | |
| 2621 void os::hint_no_preempt() {} | |
| 2622 | |
| 2623 //////////////////////////////////////////////////////////////////////////////// | |
| 2624 // suspend/resume support | |
| 2625 | |
| 2626 // the low-level signal-based suspend/resume support is a remnant from the | |
| 2627 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
| 2628 // within hotspot. Now there is a single use-case for this: | |
| 2629 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
| 2630 // that runs in the watcher thread. | |
| 2631 // The remaining code is greatly simplified from the more general suspension | |
| 2632 // code that used to be used. | |
| 2633 // | |
| 2634 // The protocol is quite simple: | |
| 2635 // - suspend: | |
| 2636 // - sends a signal to the target thread | |
| 2637 // - polls the suspend state of the osthread using a yield loop | |
| 2638 // - target thread signal handler (SR_handler) sets suspend state | |
| 2639 // and blocks in sigsuspend until continued | |
| 2640 // - resume: | |
| 2641 // - sets target osthread state to continue | |
| 2642 // - sends signal to end the sigsuspend loop in the SR_handler | |
| 2643 // | |
| 2644 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
| 2645 // | |
| 2646 | |
| 2647 static void resume_clear_context(OSThread *osthread) { | |
| 2648 osthread->set_ucontext(NULL); | |
| 2649 osthread->set_siginfo(NULL); | |
| 2650 | |
| 2651 // notify the suspend action is completed, we have now resumed | |
| 2652 osthread->sr.clear_suspended(); | |
| 2653 } | |
| 2654 | |
| 2655 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
| 2656 osthread->set_ucontext(context); | |
| 2657 osthread->set_siginfo(siginfo); | |
| 2658 } | |
| 2659 | |
| 2660 // | |
| 2661 // Handler function invoked when a thread's execution is suspended or | |
| 2662 // resumed. We have to be careful that only async-safe functions are | |
| 2663 // called here (Note: most pthread functions are not async safe and | |
| 2664 // should be avoided.) | |
| 2665 // | |
| 2666 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
| 2667 // interface point of view, but sigwait() prevents the signal hander | |
| 2668 // from being run. libpthread would get very confused by not having | |
| 2669 // its signal handlers run and prevents sigwait()'s use with the | |
| 2670 // mutex granting granting signal. | |
| 2671 // | |
| 2672 // Currently only ever called on the VMThread | |
| 2673 // | |
| 2674 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
| 2675 // Save and restore errno to avoid confusing native code with EINTR | |
| 2676 // after sigsuspend. | |
| 2677 int old_errno = errno; | |
| 2678 | |
| 2679 Thread* thread = Thread::current(); | |
| 2680 OSThread* osthread = thread->osthread(); | |
| 2681 assert(thread->is_VM_thread(), "Must be VMThread"); | |
| 2682 // read current suspend action | |
| 2683 int action = osthread->sr.suspend_action(); | |
| 2684 if (action == SR_SUSPEND) { | |
| 2685 suspend_save_context(osthread, siginfo, context); | |
| 2686 | |
| 2687 // Notify the suspend action is about to be completed. do_suspend() | |
| 2688 // waits until SR_SUSPENDED is set and then returns. We will wait | |
| 2689 // here for a resume signal and that completes the suspend-other | |
| 2690 // action. do_suspend/do_resume is always called as a pair from | |
| 2691 // the same thread - so there are no races | |
| 2692 | |
| 2693 // notify the caller | |
| 2694 osthread->sr.set_suspended(); | |
| 2695 | |
| 2696 sigset_t suspend_set; // signals for sigsuspend() | |
| 2697 | |
| 2698 // get current set of blocked signals and unblock resume signal | |
| 2699 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
| 2700 sigdelset(&suspend_set, SR_signum); | |
| 2701 | |
| 2702 // wait here until we are resumed | |
| 2703 do { | |
| 2704 sigsuspend(&suspend_set); | |
| 2705 // ignore all returns until we get a resume signal | |
| 2706 } while (osthread->sr.suspend_action() != SR_CONTINUE); | |
| 2707 | |
| 2708 resume_clear_context(osthread); | |
| 2709 | |
| 2710 } else { | |
| 2711 assert(action == SR_CONTINUE, "unexpected sr action"); | |
| 2712 // nothing special to do - just leave the handler | |
| 2713 } | |
| 2714 | |
| 2715 errno = old_errno; | |
| 2716 } | |
| 2717 | |
| 2718 | |
| 2719 static int SR_initialize() { | |
| 2720 struct sigaction act; | |
| 2721 char *s; | |
| 2722 /* Get signal number to use for suspend/resume */ | |
| 2723 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
| 2724 int sig = ::strtol(s, 0, 10); | |
| 2725 if (sig > 0 || sig < NSIG) { | |
| 2726 SR_signum = sig; | |
| 2727 } | |
| 2728 } | |
| 2729 | |
| 2730 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
| 2731 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
| 2732 | |
| 2733 sigemptyset(&SR_sigset); | |
| 2734 sigaddset(&SR_sigset, SR_signum); | |
| 2735 | |
| 2736 /* Set up signal handler for suspend/resume */ | |
| 2737 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 2738 act.sa_handler = (void (*)(int)) SR_handler; | |
| 2739 | |
| 2740 // SR_signum is blocked by default. | |
| 2741 // 4528190 - We also need to block pthread restart signal (32 on all | |
| 2742 // supported Bsd platforms). Note that BsdThreads need to block | |
| 2743 // this signal for all threads to work properly. So we don't have | |
| 2744 // to use hard-coded signal number when setting up the mask. | |
| 2745 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
| 2746 | |
| 2747 if (sigaction(SR_signum, &act, 0) == -1) { | |
| 2748 return -1; | |
| 2749 } | |
| 2750 | |
| 2751 // Save signal flag | |
| 2752 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
| 2753 return 0; | |
| 2754 } | |
| 2755 | |
| 2756 static int SR_finalize() { | |
| 2757 return 0; | |
| 2758 } | |
| 2759 | |
| 2760 | |
| 2761 // returns true on success and false on error - really an error is fatal | |
| 2762 // but this seems the normal response to library errors | |
| 2763 static bool do_suspend(OSThread* osthread) { | |
| 2764 // mark as suspended and send signal | |
| 2765 osthread->sr.set_suspend_action(SR_SUSPEND); | |
| 2766 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 2767 assert_status(status == 0, status, "pthread_kill"); | |
| 2768 | |
| 2769 // check status and wait until notified of suspension | |
| 2770 if (status == 0) { | |
| 2771 for (int i = 0; !osthread->sr.is_suspended(); i++) { | |
| 2772 os::yield_all(i); | |
| 2773 } | |
| 2774 osthread->sr.set_suspend_action(SR_NONE); | |
| 2775 return true; | |
| 2776 } | |
| 2777 else { | |
| 2778 osthread->sr.set_suspend_action(SR_NONE); | |
| 2779 return false; | |
| 2780 } | |
| 2781 } | |
| 2782 | |
| 2783 static void do_resume(OSThread* osthread) { | |
| 2784 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
| 2785 osthread->sr.set_suspend_action(SR_CONTINUE); | |
| 2786 | |
| 2787 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 2788 assert_status(status == 0, status, "pthread_kill"); | |
| 2789 // check status and wait unit notified of resumption | |
| 2790 if (status == 0) { | |
| 2791 for (int i = 0; osthread->sr.is_suspended(); i++) { | |
| 2792 os::yield_all(i); | |
| 2793 } | |
| 2794 } | |
| 2795 osthread->sr.set_suspend_action(SR_NONE); | |
| 2796 } | |
| 2797 | |
| 2798 //////////////////////////////////////////////////////////////////////////////// | |
| 2799 // interrupt support | |
| 2800 | |
| 2801 void os::interrupt(Thread* thread) { | |
| 2802 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2803 "possibility of dangling Thread pointer"); | |
| 2804 | |
| 2805 OSThread* osthread = thread->osthread(); | |
| 2806 | |
| 2807 if (!osthread->interrupted()) { | |
| 2808 osthread->set_interrupted(true); | |
| 2809 // More than one thread can get here with the same value of osthread, | |
| 2810 // resulting in multiple notifications. We do, however, want the store | |
| 2811 // to interrupted() to be visible to other threads before we execute unpark(). | |
| 2812 OrderAccess::fence(); | |
| 2813 ParkEvent * const slp = thread->_SleepEvent ; | |
| 2814 if (slp != NULL) slp->unpark() ; | |
| 2815 } | |
| 2816 | |
| 2817 // For JSR166. Unpark even if interrupt status already was set | |
| 2818 if (thread->is_Java_thread()) | |
| 2819 ((JavaThread*)thread)->parker()->unpark(); | |
| 2820 | |
| 2821 ParkEvent * ev = thread->_ParkEvent ; | |
| 2822 if (ev != NULL) ev->unpark() ; | |
| 2823 | |
| 2824 } | |
| 2825 | |
| 2826 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 2827 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 2828 "possibility of dangling Thread pointer"); | |
| 2829 | |
| 2830 OSThread* osthread = thread->osthread(); | |
| 2831 | |
| 2832 bool interrupted = osthread->interrupted(); | |
| 2833 | |
| 2834 if (interrupted && clear_interrupted) { | |
| 2835 osthread->set_interrupted(false); | |
| 2836 // consider thread->_SleepEvent->reset() ... optional optimization | |
| 2837 } | |
| 2838 | |
| 2839 return interrupted; | |
| 2840 } | |
| 2841 | |
| 2842 /////////////////////////////////////////////////////////////////////////////////// | |
| 2843 // signal handling (except suspend/resume) | |
| 2844 | |
| 2845 // This routine may be used by user applications as a "hook" to catch signals. | |
| 2846 // The user-defined signal handler must pass unrecognized signals to this | |
| 2847 // routine, and if it returns true (non-zero), then the signal handler must | |
| 2848 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
| 2849 // routine will never retun false (zero), but instead will execute a VM panic | |
| 2850 // routine kill the process. | |
| 2851 // | |
| 2852 // If this routine returns false, it is OK to call it again. This allows | |
| 2853 // the user-defined signal handler to perform checks either before or after | |
| 2854 // the VM performs its own checks. Naturally, the user code would be making | |
| 2855 // a serious error if it tried to handle an exception (such as a null check | |
| 2856 // or breakpoint) that the VM was generating for its own correct operation. | |
| 2857 // | |
| 2858 // This routine may recognize any of the following kinds of signals: | |
| 2859 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
| 2860 // It should be consulted by handlers for any of those signals. | |
| 2861 // | |
| 2862 // The caller of this routine must pass in the three arguments supplied | |
| 2863 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
| 2864 // field of the structure passed to sigaction(). This routine assumes that | |
| 2865 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
| 2866 // | |
| 2867 // Note that the VM will print warnings if it detects conflicting signal | |
| 2868 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
| 2869 // | |
| 2870 extern "C" JNIEXPORT int | |
| 2871 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
| 2872 void* ucontext, int abort_if_unrecognized); | |
| 2873 | |
| 2874 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
| 2875 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
| 2876 JVM_handle_bsd_signal(sig, info, uc, true); | |
| 2877 } | |
| 2878 | |
| 2879 | |
| 2880 // This boolean allows users to forward their own non-matching signals | |
| 2881 // to JVM_handle_bsd_signal, harmlessly. | |
| 2882 bool os::Bsd::signal_handlers_are_installed = false; | |
| 2883 | |
| 2884 // For signal-chaining | |
| 2885 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
| 2886 unsigned int os::Bsd::sigs = 0; | |
| 2887 bool os::Bsd::libjsig_is_loaded = false; | |
| 2888 typedef struct sigaction *(*get_signal_t)(int); | |
| 2889 get_signal_t os::Bsd::get_signal_action = NULL; | |
| 2890 | |
| 2891 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
| 2892 struct sigaction *actp = NULL; | |
| 2893 | |
| 2894 if (libjsig_is_loaded) { | |
| 2895 // Retrieve the old signal handler from libjsig | |
| 2896 actp = (*get_signal_action)(sig); | |
| 2897 } | |
| 2898 if (actp == NULL) { | |
| 2899 // Retrieve the preinstalled signal handler from jvm | |
| 2900 actp = get_preinstalled_handler(sig); | |
| 2901 } | |
| 2902 | |
| 2903 return actp; | |
| 2904 } | |
| 2905 | |
| 2906 static bool call_chained_handler(struct sigaction *actp, int sig, | |
| 2907 siginfo_t *siginfo, void *context) { | |
| 2908 // Call the old signal handler | |
| 2909 if (actp->sa_handler == SIG_DFL) { | |
| 2910 // It's more reasonable to let jvm treat it as an unexpected exception | |
| 2911 // instead of taking the default action. | |
| 2912 return false; | |
| 2913 } else if (actp->sa_handler != SIG_IGN) { | |
| 2914 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
| 2915 // automaticlly block the signal | |
| 2916 sigaddset(&(actp->sa_mask), sig); | |
| 2917 } | |
| 2918 | |
| 2919 sa_handler_t hand; | |
| 2920 sa_sigaction_t sa; | |
| 2921 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
| 2922 // retrieve the chained handler | |
| 2923 if (siginfo_flag_set) { | |
| 2924 sa = actp->sa_sigaction; | |
| 2925 } else { | |
| 2926 hand = actp->sa_handler; | |
| 2927 } | |
| 2928 | |
| 2929 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
| 2930 actp->sa_handler = SIG_DFL; | |
| 2931 } | |
| 2932 | |
| 2933 // try to honor the signal mask | |
| 2934 sigset_t oset; | |
| 2935 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
| 2936 | |
| 2937 // call into the chained handler | |
| 2938 if (siginfo_flag_set) { | |
| 2939 (*sa)(sig, siginfo, context); | |
| 2940 } else { | |
| 2941 (*hand)(sig); | |
| 2942 } | |
| 2943 | |
| 2944 // restore the signal mask | |
| 2945 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
| 2946 } | |
| 2947 // Tell jvm's signal handler the signal is taken care of. | |
| 2948 return true; | |
| 2949 } | |
| 2950 | |
| 2951 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
| 2952 bool chained = false; | |
| 2953 // signal-chaining | |
| 2954 if (UseSignalChaining) { | |
| 2955 struct sigaction *actp = get_chained_signal_action(sig); | |
| 2956 if (actp != NULL) { | |
| 2957 chained = call_chained_handler(actp, sig, siginfo, context); | |
| 2958 } | |
| 2959 } | |
| 2960 return chained; | |
| 2961 } | |
| 2962 | |
| 2963 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
| 2964 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
| 2965 return &sigact[sig]; | |
| 2966 } | |
| 2967 return NULL; | |
| 2968 } | |
| 2969 | |
| 2970 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
| 2971 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 2972 sigact[sig] = oldAct; | |
| 2973 sigs |= (unsigned int)1 << sig; | |
| 2974 } | |
| 2975 | |
| 2976 // for diagnostic | |
| 2977 int os::Bsd::sigflags[MAXSIGNUM]; | |
| 2978 | |
| 2979 int os::Bsd::get_our_sigflags(int sig) { | |
| 2980 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 2981 return sigflags[sig]; | |
| 2982 } | |
| 2983 | |
| 2984 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
| 2985 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 2986 sigflags[sig] = flags; | |
| 2987 } | |
| 2988 | |
| 2989 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
| 2990 // Check for overwrite. | |
| 2991 struct sigaction oldAct; | |
| 2992 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
| 2993 | |
| 2994 void* oldhand = oldAct.sa_sigaction | |
| 2995 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 2996 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 2997 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
| 2998 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
| 2999 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
| 3000 if (AllowUserSignalHandlers || !set_installed) { | |
| 3001 // Do not overwrite; user takes responsibility to forward to us. | |
| 3002 return; | |
| 3003 } else if (UseSignalChaining) { | |
| 3004 // save the old handler in jvm | |
| 3005 save_preinstalled_handler(sig, oldAct); | |
| 3006 // libjsig also interposes the sigaction() call below and saves the | |
| 3007 // old sigaction on it own. | |
| 3008 } else { | |
| 3009 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
| 3010 "%#lx for signal %d.", (long)oldhand, sig)); | |
| 3011 } | |
| 3012 } | |
| 3013 | |
| 3014 struct sigaction sigAct; | |
| 3015 sigfillset(&(sigAct.sa_mask)); | |
| 3016 sigAct.sa_handler = SIG_DFL; | |
| 3017 if (!set_installed) { | |
| 3018 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3019 } else { | |
| 3020 sigAct.sa_sigaction = signalHandler; | |
| 3021 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 3022 } | |
| 3023 // Save flags, which are set by ours | |
| 3024 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 3025 sigflags[sig] = sigAct.sa_flags; | |
| 3026 | |
| 3027 int ret = sigaction(sig, &sigAct, &oldAct); | |
| 3028 assert(ret == 0, "check"); | |
| 3029 | |
| 3030 void* oldhand2 = oldAct.sa_sigaction | |
| 3031 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 3032 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 3033 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
| 3034 } | |
| 3035 | |
| 3036 // install signal handlers for signals that HotSpot needs to | |
| 3037 // handle in order to support Java-level exception handling. | |
| 3038 | |
| 3039 void os::Bsd::install_signal_handlers() { | |
| 3040 if (!signal_handlers_are_installed) { | |
| 3041 signal_handlers_are_installed = true; | |
| 3042 | |
| 3043 // signal-chaining | |
| 3044 typedef void (*signal_setting_t)(); | |
| 3045 signal_setting_t begin_signal_setting = NULL; | |
| 3046 signal_setting_t end_signal_setting = NULL; | |
| 3047 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3048 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
| 3049 if (begin_signal_setting != NULL) { | |
| 3050 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 3051 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
| 3052 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
| 3053 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
| 3054 libjsig_is_loaded = true; | |
| 3055 assert(UseSignalChaining, "should enable signal-chaining"); | |
| 3056 } | |
| 3057 if (libjsig_is_loaded) { | |
| 3058 // Tell libjsig jvm is setting signal handlers | |
| 3059 (*begin_signal_setting)(); | |
| 3060 } | |
| 3061 | |
| 3062 set_signal_handler(SIGSEGV, true); | |
| 3063 set_signal_handler(SIGPIPE, true); | |
| 3064 set_signal_handler(SIGBUS, true); | |
| 3065 set_signal_handler(SIGILL, true); | |
| 3066 set_signal_handler(SIGFPE, true); | |
| 3067 set_signal_handler(SIGXFSZ, true); | |
| 3068 | |
| 3069 #if defined(__APPLE__) | |
| 3070 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
| 3071 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
| 3072 // signal handler that's placed on our process by CrashReporter. This disables | |
| 3073 // CrashReporter-based reporting. | |
| 3074 // | |
| 3075 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
| 3076 // on caught fatal signals. | |
| 3077 // | |
| 3078 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
| 3079 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
| 3080 // exception handling, while leaving the standard BSD signal handlers functional. | |
| 3081 kern_return_t kr; | |
| 3082 kr = task_set_exception_ports(mach_task_self(), | |
| 3083 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
| 3084 MACH_PORT_NULL, | |
| 3085 EXCEPTION_STATE_IDENTITY, | |
| 3086 MACHINE_THREAD_STATE); | |
| 3087 | |
| 3088 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
| 3089 #endif | |
| 3090 | |
| 3091 if (libjsig_is_loaded) { | |
| 3092 // Tell libjsig jvm finishes setting signal handlers | |
| 3093 (*end_signal_setting)(); | |
| 3094 } | |
| 3095 | |
| 3096 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
| 3097 // and if UserSignalHandler is installed all bets are off | |
| 3098 if (CheckJNICalls) { | |
| 3099 if (libjsig_is_loaded) { | |
| 3100 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
| 3101 check_signals = false; | |
| 3102 } | |
| 3103 if (AllowUserSignalHandlers) { | |
| 3104 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
| 3105 check_signals = false; | |
| 3106 } | |
| 3107 } | |
| 3108 } | |
| 3109 } | |
| 3110 | |
| 3111 | |
| 3112 ///// | |
| 3113 // glibc on Bsd platform uses non-documented flag | |
| 3114 // to indicate, that some special sort of signal | |
| 3115 // trampoline is used. | |
| 3116 // We will never set this flag, and we should | |
| 3117 // ignore this flag in our diagnostic | |
| 3118 #ifdef SIGNIFICANT_SIGNAL_MASK | |
| 3119 #undef SIGNIFICANT_SIGNAL_MASK | |
| 3120 #endif | |
| 3121 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
| 3122 | |
| 3123 static const char* get_signal_handler_name(address handler, | |
| 3124 char* buf, int buflen) { | |
| 3125 int offset; | |
| 3126 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
| 3127 if (found) { | |
| 3128 // skip directory names | |
| 3129 const char *p1, *p2; | |
| 3130 p1 = buf; | |
| 3131 size_t len = strlen(os::file_separator()); | |
| 3132 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
| 3133 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
| 3134 } else { | |
| 3135 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
| 3136 } | |
| 3137 return buf; | |
| 3138 } | |
| 3139 | |
| 3140 static void print_signal_handler(outputStream* st, int sig, | |
| 3141 char* buf, size_t buflen) { | |
| 3142 struct sigaction sa; | |
| 3143 | |
| 3144 sigaction(sig, NULL, &sa); | |
| 3145 | |
| 3146 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
| 3147 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3148 | |
| 3149 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
| 3150 | |
| 3151 address handler = (sa.sa_flags & SA_SIGINFO) | |
| 3152 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 3153 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 3154 | |
| 3155 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
| 3156 st->print("SIG_DFL"); | |
| 3157 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
| 3158 st->print("SIG_IGN"); | |
| 3159 } else { | |
| 3160 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
| 3161 } | |
| 3162 | |
| 3163 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
| 3164 | |
| 3165 address rh = VMError::get_resetted_sighandler(sig); | |
| 3166 // May be, handler was resetted by VMError? | |
| 3167 if(rh != NULL) { | |
| 3168 handler = rh; | |
| 3169 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
| 3170 } | |
| 3171 | |
| 3172 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
| 3173 | |
| 3174 // Check: is it our handler? | |
| 3175 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
| 3176 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
| 3177 // It is our signal handler | |
| 3178 // check for flags, reset system-used one! | |
| 3179 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3180 st->print( | |
| 3181 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
| 3182 os::Bsd::get_our_sigflags(sig)); | |
| 3183 } | |
| 3184 } | |
| 3185 st->cr(); | |
| 3186 } | |
| 3187 | |
| 3188 | |
| 3189 #define DO_SIGNAL_CHECK(sig) \ | |
| 3190 if (!sigismember(&check_signal_done, sig)) \ | |
| 3191 os::Bsd::check_signal_handler(sig) | |
| 3192 | |
| 3193 // This method is a periodic task to check for misbehaving JNI applications | |
| 3194 // under CheckJNI, we can add any periodic checks here | |
| 3195 | |
| 3196 void os::run_periodic_checks() { | |
| 3197 | |
| 3198 if (check_signals == false) return; | |
| 3199 | |
| 3200 // SEGV and BUS if overridden could potentially prevent | |
| 3201 // generation of hs*.log in the event of a crash, debugging | |
| 3202 // such a case can be very challenging, so we absolutely | |
| 3203 // check the following for a good measure: | |
| 3204 DO_SIGNAL_CHECK(SIGSEGV); | |
| 3205 DO_SIGNAL_CHECK(SIGILL); | |
| 3206 DO_SIGNAL_CHECK(SIGFPE); | |
| 3207 DO_SIGNAL_CHECK(SIGBUS); | |
| 3208 DO_SIGNAL_CHECK(SIGPIPE); | |
| 3209 DO_SIGNAL_CHECK(SIGXFSZ); | |
| 3210 | |
| 3211 | |
| 3212 // ReduceSignalUsage allows the user to override these handlers | |
| 3213 // see comments at the very top and jvm_solaris.h | |
| 3214 if (!ReduceSignalUsage) { | |
| 3215 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
| 3216 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
| 3217 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
| 3218 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
| 3219 } | |
| 3220 | |
| 3221 DO_SIGNAL_CHECK(SR_signum); | |
| 3222 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
| 3223 } | |
| 3224 | |
| 3225 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
| 3226 | |
| 3227 static os_sigaction_t os_sigaction = NULL; | |
| 3228 | |
| 3229 void os::Bsd::check_signal_handler(int sig) { | |
| 3230 char buf[O_BUFLEN]; | |
| 3231 address jvmHandler = NULL; | |
| 3232 | |
| 3233 | |
| 3234 struct sigaction act; | |
| 3235 if (os_sigaction == NULL) { | |
| 3236 // only trust the default sigaction, in case it has been interposed | |
| 3237 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
| 3238 if (os_sigaction == NULL) return; | |
| 3239 } | |
| 3240 | |
| 3241 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
| 3242 | |
| 3243 | |
| 3244 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 3245 | |
| 3246 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
| 3247 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
| 3248 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
| 3249 | |
| 3250 | |
| 3251 switch(sig) { | |
| 3252 case SIGSEGV: | |
| 3253 case SIGBUS: | |
| 3254 case SIGFPE: | |
| 3255 case SIGPIPE: | |
| 3256 case SIGILL: | |
| 3257 case SIGXFSZ: | |
| 3258 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
| 3259 break; | |
| 3260 | |
| 3261 case SHUTDOWN1_SIGNAL: | |
| 3262 case SHUTDOWN2_SIGNAL: | |
| 3263 case SHUTDOWN3_SIGNAL: | |
| 3264 case BREAK_SIGNAL: | |
| 3265 jvmHandler = (address)user_handler(); | |
| 3266 break; | |
| 3267 | |
| 3268 case INTERRUPT_SIGNAL: | |
| 3269 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
| 3270 break; | |
| 3271 | |
| 3272 default: | |
| 3273 if (sig == SR_signum) { | |
| 3274 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
| 3275 } else { | |
| 3276 return; | |
| 3277 } | |
| 3278 break; | |
| 3279 } | |
| 3280 | |
| 3281 if (thisHandler != jvmHandler) { | |
| 3282 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
| 3283 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
| 3284 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
| 3285 // No need to check this sig any longer | |
| 3286 sigaddset(&check_signal_done, sig); | |
| 3287 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 3288 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
| 3289 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
| 3290 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
| 3291 // No need to check this sig any longer | |
| 3292 sigaddset(&check_signal_done, sig); | |
| 3293 } | |
| 3294 | |
| 3295 // Dump all the signal | |
| 3296 if (sigismember(&check_signal_done, sig)) { | |
| 3297 print_signal_handlers(tty, buf, O_BUFLEN); | |
| 3298 } | |
| 3299 } | |
| 3300 | |
| 3301 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
| 3302 | |
| 3303 extern bool signal_name(int signo, char* buf, size_t len); | |
| 3304 | |
| 3305 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
| 3306 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
| 3307 // signal | |
| 3308 if (!signal_name(exception_code, buf, size)) { | |
| 3309 jio_snprintf(buf, size, "SIG%d", exception_code); | |
| 3310 } | |
| 3311 return buf; | |
| 3312 } else { | |
| 3313 return NULL; | |
| 3314 } | |
| 3315 } | |
| 3316 | |
| 3317 // this is called _before_ the most of global arguments have been parsed | |
| 3318 void os::init(void) { | |
| 3319 char dummy; /* used to get a guess on initial stack address */ | |
| 3320 // first_hrtime = gethrtime(); | |
| 3321 | |
| 3322 // With BsdThreads the JavaMain thread pid (primordial thread) | |
| 3323 // is different than the pid of the java launcher thread. | |
| 3324 // So, on Bsd, the launcher thread pid is passed to the VM | |
| 3325 // via the sun.java.launcher.pid property. | |
| 3326 // Use this property instead of getpid() if it was correctly passed. | |
| 3327 // See bug 6351349. | |
| 3328 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
| 3329 | |
| 3330 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
| 3331 | |
| 3332 clock_tics_per_sec = CLK_TCK; | |
| 3333 | |
| 3334 init_random(1234567); | |
| 3335 | |
| 3336 ThreadCritical::initialize(); | |
| 3337 | |
| 3338 Bsd::set_page_size(getpagesize()); | |
| 3339 if (Bsd::page_size() == -1) { | |
| 3340 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
| 3341 strerror(errno))); | |
| 3342 } | |
| 3343 init_page_sizes((size_t) Bsd::page_size()); | |
| 3344 | |
| 3345 Bsd::initialize_system_info(); | |
| 3346 | |
| 3347 // main_thread points to the aboriginal thread | |
| 3348 Bsd::_main_thread = pthread_self(); | |
| 3349 | |
| 3350 Bsd::clock_init(); | |
| 3351 initial_time_count = os::elapsed_counter(); | |
| 3352 | |
| 3353 #ifdef __APPLE__ | |
| 3354 // XXXDARWIN | |
| 3355 // Work around the unaligned VM callbacks in hotspot's | |
| 3356 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
| 3357 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
| 3358 // alignment when doing symbol lookup. To work around this, we force early | |
| 3359 // binding of all symbols now, thus binding when alignment is known-good. | |
| 3360 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
| 3361 #endif | |
| 3362 } | |
| 3363 | |
| 3364 // To install functions for atexit system call | |
| 3365 extern "C" { | |
| 3366 static void perfMemory_exit_helper() { | |
| 3367 perfMemory_exit(); | |
| 3368 } | |
| 3369 } | |
| 3370 | |
| 3371 // this is called _after_ the global arguments have been parsed | |
| 3372 jint os::init_2(void) | |
| 3373 { | |
| 3374 // Allocate a single page and mark it as readable for safepoint polling | |
| 3375 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 3376 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
| 3377 | |
| 3378 os::set_polling_page( polling_page ); | |
| 3379 | |
| 3380 #ifndef PRODUCT | |
| 3381 if(Verbose && PrintMiscellaneous) | |
| 3382 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 3383 #endif | |
| 3384 | |
| 3385 if (!UseMembar) { | |
| 3386 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 3387 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
| 3388 os::set_memory_serialize_page( mem_serialize_page ); | |
| 3389 | |
| 3390 #ifndef PRODUCT | |
| 3391 if(Verbose && PrintMiscellaneous) | |
| 3392 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 3393 #endif | |
| 3394 } | |
| 3395 | |
| 3396 os::large_page_init(); | |
| 3397 | |
| 3398 // initialize suspend/resume support - must do this before signal_sets_init() | |
| 3399 if (SR_initialize() != 0) { | |
| 3400 perror("SR_initialize failed"); | |
| 3401 return JNI_ERR; | |
| 3402 } | |
| 3403 | |
| 3404 Bsd::signal_sets_init(); | |
| 3405 Bsd::install_signal_handlers(); | |
| 3406 | |
| 3407 // Check minimum allowable stack size for thread creation and to initialize | |
| 3408 // the java system classes, including StackOverflowError - depends on page | |
| 3409 // size. Add a page for compiler2 recursion in main thread. | |
| 3410 // Add in 2*BytesPerWord times page size to account for VM stack during | |
| 3411 // class initialization depending on 32 or 64 bit VM. | |
| 3412 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
| 3413 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
| 3414 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
| 3415 | |
| 3416 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
| 3417 if (threadStackSizeInBytes != 0 && | |
| 3418 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
| 3419 tty->print_cr("\nThe stack size specified is too small, " | |
| 3420 "Specify at least %dk", | |
| 3421 os::Bsd::min_stack_allowed/ K); | |
| 3422 return JNI_ERR; | |
| 3423 } | |
| 3424 | |
| 3425 // Make the stack size a multiple of the page size so that | |
| 3426 // the yellow/red zones can be guarded. | |
| 3427 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
| 3428 vm_page_size())); | |
| 3429 | |
| 3430 if (MaxFDLimit) { | |
| 3431 // set the number of file descriptors to max. print out error | |
| 3432 // if getrlimit/setrlimit fails but continue regardless. | |
| 3433 struct rlimit nbr_files; | |
| 3434 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3435 if (status != 0) { | |
| 3436 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3437 perror("os::init_2 getrlimit failed"); | |
| 3438 } else { | |
| 3439 nbr_files.rlim_cur = nbr_files.rlim_max; | |
| 3440 | |
| 3441 #ifdef __APPLE__ | |
| 3442 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
| 3443 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
| 3444 // be used instead | |
| 3445 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
| 3446 #endif | |
| 3447 | |
| 3448 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 3449 if (status != 0) { | |
| 3450 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 3451 perror("os::init_2 setrlimit failed"); | |
| 3452 } | |
| 3453 } | |
| 3454 } | |
| 3455 | |
| 3456 // at-exit methods are called in the reverse order of their registration. | |
| 3457 // atexit functions are called on return from main or as a result of a | |
| 3458 // call to exit(3C). There can be only 32 of these functions registered | |
| 3459 // and atexit() does not set errno. | |
| 3460 | |
| 3461 if (PerfAllowAtExitRegistration) { | |
| 3462 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 3463 // atexit functions can be delayed until process exit time, which | |
| 3464 // can be problematic for embedded VM situations. Embedded VMs should | |
| 3465 // call DestroyJavaVM() to assure that VM resources are released. | |
| 3466 | |
| 3467 // note: perfMemory_exit_helper atexit function may be removed in | |
| 3468 // the future if the appropriate cleanup code can be added to the | |
| 3469 // VM_Exit VMOperation's doit method. | |
| 3470 if (atexit(perfMemory_exit_helper) != 0) { | |
| 3471 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
| 3472 } | |
| 3473 } | |
| 3474 | |
| 3475 // initialize thread priority policy | |
| 3476 prio_init(); | |
| 3477 | |
| 4006 | 3478 #ifdef __APPLE__ |
| 3479 // dynamically link to objective c gc registration | |
| 3480 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
| 3481 if (handleLibObjc != NULL) { | |
| 3482 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
| 3483 } | |
| 3484 #endif | |
| 3485 | |
| 3960 | 3486 return JNI_OK; |
| 3487 } | |
| 3488 | |
| 3489 // this is called at the end of vm_initialization | |
| 3490 void os::init_3(void) { } | |
| 3491 | |
| 3492 // Mark the polling page as unreadable | |
| 3493 void os::make_polling_page_unreadable(void) { | |
| 3494 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
| 3495 fatal("Could not disable polling page"); | |
| 3496 }; | |
| 3497 | |
| 3498 // Mark the polling page as readable | |
| 3499 void os::make_polling_page_readable(void) { | |
| 3500 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
| 3501 fatal("Could not enable polling page"); | |
| 3502 } | |
| 3503 }; | |
| 3504 | |
| 3505 int os::active_processor_count() { | |
| 3506 return _processor_count; | |
| 3507 } | |
| 3508 | |
| 4006 | 3509 void os::set_native_thread_name(const char *name) { |
| 3510 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
| 3511 // This is only supported in Snow Leopard and beyond | |
| 3512 if (name != NULL) { | |
| 3513 // Add a "Java: " prefix to the name | |
| 3514 char buf[MAXTHREADNAMESIZE]; | |
| 3515 snprintf(buf, sizeof(buf), "Java: %s", name); | |
| 3516 pthread_setname_np(buf); | |
| 3517 } | |
| 3518 #endif | |
| 3519 } | |
| 3520 | |
| 3960 | 3521 bool os::distribute_processes(uint length, uint* distribution) { |
| 3522 // Not yet implemented. | |
| 3523 return false; | |
| 3524 } | |
| 3525 | |
| 3526 bool os::bind_to_processor(uint processor_id) { | |
| 3527 // Not yet implemented. | |
| 3528 return false; | |
| 3529 } | |
| 3530 | |
| 3531 /// | |
| 3532 | |
| 3533 // Suspends the target using the signal mechanism and then grabs the PC before | |
| 3534 // resuming the target. Used by the flat-profiler only | |
| 3535 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 3536 // Make sure that it is called by the watcher for the VMThread | |
| 3537 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
| 3538 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
| 3539 | |
| 3540 ExtendedPC epc; | |
| 3541 | |
| 3542 OSThread* osthread = thread->osthread(); | |
| 3543 if (do_suspend(osthread)) { | |
| 3544 if (osthread->ucontext() != NULL) { | |
| 3545 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); | |
| 3546 } else { | |
| 3547 // NULL context is unexpected, double-check this is the VMThread | |
| 3548 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
| 3549 } | |
| 3550 do_resume(osthread); | |
| 3551 } | |
| 3552 // failure means pthread_kill failed for some reason - arguably this is | |
| 3553 // a fatal problem, but such problems are ignored elsewhere | |
| 3554 | |
| 3555 return epc; | |
| 3556 } | |
| 3557 | |
| 3558 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
| 3559 { | |
| 3560 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 3561 } | |
| 3562 | |
| 3563 //////////////////////////////////////////////////////////////////////////////// | |
| 3564 // debug support | |
| 3565 | |
| 3566 static address same_page(address x, address y) { | |
| 3567 int page_bits = -os::vm_page_size(); | |
| 3568 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) | |
| 3569 return x; | |
| 3570 else if (x > y) | |
| 3571 return (address)(intptr_t(y) | ~page_bits) + 1; | |
| 3572 else | |
| 3573 return (address)(intptr_t(y) & page_bits); | |
| 3574 } | |
| 3575 | |
| 3576 bool os::find(address addr, outputStream* st) { | |
| 3577 Dl_info dlinfo; | |
| 3578 memset(&dlinfo, 0, sizeof(dlinfo)); | |
| 3579 if (dladdr(addr, &dlinfo)) { | |
| 3580 st->print(PTR_FORMAT ": ", addr); | |
| 3581 if (dlinfo.dli_sname != NULL) { | |
| 3582 st->print("%s+%#x", dlinfo.dli_sname, | |
| 3583 addr - (intptr_t)dlinfo.dli_saddr); | |
| 3584 } else if (dlinfo.dli_fname) { | |
| 3585 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); | |
| 3586 } else { | |
| 3587 st->print("<absolute address>"); | |
| 3588 } | |
| 3589 if (dlinfo.dli_fname) { | |
| 3590 st->print(" in %s", dlinfo.dli_fname); | |
| 3591 } | |
| 3592 if (dlinfo.dli_fbase) { | |
| 3593 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); | |
| 3594 } | |
| 3595 st->cr(); | |
| 3596 | |
| 3597 if (Verbose) { | |
| 3598 // decode some bytes around the PC | |
| 3599 address begin = same_page(addr-40, addr); | |
| 3600 address end = same_page(addr+40, addr); | |
| 3601 address lowest = (address) dlinfo.dli_sname; | |
| 3602 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
| 3603 if (begin < lowest) begin = lowest; | |
| 3604 Dl_info dlinfo2; | |
| 3605 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
| 3606 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
| 3607 end = (address) dlinfo2.dli_saddr; | |
| 3608 Disassembler::decode(begin, end, st); | |
| 3609 } | |
| 3610 return true; | |
| 3611 } | |
| 3612 return false; | |
| 3613 } | |
| 3614 | |
| 3615 //////////////////////////////////////////////////////////////////////////////// | |
| 3616 // misc | |
| 3617 | |
| 3618 // This does not do anything on Bsd. This is basically a hook for being | |
| 3619 // able to use structured exception handling (thread-local exception filters) | |
| 3620 // on, e.g., Win32. | |
| 3621 void | |
| 3622 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
| 3623 JavaCallArguments* args, Thread* thread) { | |
| 3624 f(value, method, args, thread); | |
| 3625 } | |
| 3626 | |
| 3627 void os::print_statistics() { | |
| 3628 } | |
| 3629 | |
| 3630 int os::message_box(const char* title, const char* message) { | |
| 3631 int i; | |
| 3632 fdStream err(defaultStream::error_fd()); | |
| 3633 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3634 err.cr(); | |
| 3635 err.print_raw_cr(title); | |
| 3636 for (i = 0; i < 78; i++) err.print_raw("-"); | |
| 3637 err.cr(); | |
| 3638 err.print_raw_cr(message); | |
| 3639 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 3640 err.cr(); | |
| 3641 | |
| 3642 char buf[16]; | |
| 3643 // Prevent process from exiting upon "read error" without consuming all CPU | |
| 3644 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
| 3645 | |
| 3646 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 3647 } | |
| 3648 | |
| 3649 int os::stat(const char *path, struct stat *sbuf) { | |
| 3650 char pathbuf[MAX_PATH]; | |
| 3651 if (strlen(path) > MAX_PATH - 1) { | |
| 3652 errno = ENAMETOOLONG; | |
| 3653 return -1; | |
| 3654 } | |
| 3655 os::native_path(strcpy(pathbuf, path)); | |
| 3656 return ::stat(pathbuf, sbuf); | |
| 3657 } | |
| 3658 | |
| 3659 bool os::check_heap(bool force) { | |
| 3660 return true; | |
| 3661 } | |
| 3662 | |
| 3663 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
| 3664 return ::vsnprintf(buf, count, format, args); | |
| 3665 } | |
| 3666 | |
| 3667 // Is a (classpath) directory empty? | |
| 3668 bool os::dir_is_empty(const char* path) { | |
| 3669 DIR *dir = NULL; | |
| 3670 struct dirent *ptr; | |
| 3671 | |
| 3672 dir = opendir(path); | |
| 3673 if (dir == NULL) return true; | |
| 3674 | |
| 3675 /* Scan the directory */ | |
| 3676 bool result = true; | |
| 3677 char buf[sizeof(struct dirent) + MAX_PATH]; | |
| 3678 while (result && (ptr = ::readdir(dir)) != NULL) { | |
| 3679 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
| 3680 result = false; | |
| 3681 } | |
| 3682 } | |
| 3683 closedir(dir); | |
| 3684 return result; | |
| 3685 } | |
| 3686 | |
| 3687 // This code originates from JDK's sysOpen and open64_w | |
| 3688 // from src/solaris/hpi/src/system_md.c | |
| 3689 | |
| 3690 #ifndef O_DELETE | |
| 3691 #define O_DELETE 0x10000 | |
| 3692 #endif | |
| 3693 | |
| 3694 // Open a file. Unlink the file immediately after open returns | |
| 3695 // if the specified oflag has the O_DELETE flag set. | |
| 3696 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
| 3697 | |
| 3698 int os::open(const char *path, int oflag, int mode) { | |
| 3699 | |
| 3700 if (strlen(path) > MAX_PATH - 1) { | |
| 3701 errno = ENAMETOOLONG; | |
| 3702 return -1; | |
| 3703 } | |
| 3704 int fd; | |
| 3705 int o_delete = (oflag & O_DELETE); | |
| 3706 oflag = oflag & ~O_DELETE; | |
| 3707 | |
| 3708 fd = ::open(path, oflag, mode); | |
| 3709 if (fd == -1) return -1; | |
| 3710 | |
| 3711 //If the open succeeded, the file might still be a directory | |
| 3712 { | |
| 3713 struct stat buf; | |
| 3714 int ret = ::fstat(fd, &buf); | |
| 3715 int st_mode = buf.st_mode; | |
| 3716 | |
| 3717 if (ret != -1) { | |
| 3718 if ((st_mode & S_IFMT) == S_IFDIR) { | |
| 3719 errno = EISDIR; | |
| 3720 ::close(fd); | |
| 3721 return -1; | |
| 3722 } | |
| 3723 } else { | |
| 3724 ::close(fd); | |
| 3725 return -1; | |
| 3726 } | |
| 3727 } | |
| 3728 | |
| 3729 /* | |
| 3730 * All file descriptors that are opened in the JVM and not | |
| 3731 * specifically destined for a subprocess should have the | |
| 3732 * close-on-exec flag set. If we don't set it, then careless 3rd | |
| 3733 * party native code might fork and exec without closing all | |
| 3734 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
| 3735 * UNIXProcess.c), and this in turn might: | |
| 3736 * | |
| 3737 * - cause end-of-file to fail to be detected on some file | |
| 3738 * descriptors, resulting in mysterious hangs, or | |
| 3739 * | |
| 3740 * - might cause an fopen in the subprocess to fail on a system | |
| 3741 * suffering from bug 1085341. | |
| 3742 * | |
| 3743 * (Yes, the default setting of the close-on-exec flag is a Unix | |
| 3744 * design flaw) | |
| 3745 * | |
| 3746 * See: | |
| 3747 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
| 3748 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
| 3749 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
| 3750 */ | |
| 3751 #ifdef FD_CLOEXEC | |
| 3752 { | |
| 3753 int flags = ::fcntl(fd, F_GETFD); | |
| 3754 if (flags != -1) | |
| 3755 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
| 3756 } | |
| 3757 #endif | |
| 3758 | |
| 3759 if (o_delete != 0) { | |
| 3760 ::unlink(path); | |
| 3761 } | |
| 3762 return fd; | |
| 3763 } | |
| 3764 | |
| 3765 | |
| 3766 // create binary file, rewriting existing file if required | |
| 3767 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 3768 int oflags = O_WRONLY | O_CREAT; | |
| 3769 if (!rewrite_existing) { | |
| 3770 oflags |= O_EXCL; | |
| 3771 } | |
| 3772 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
| 3773 } | |
| 3774 | |
| 3775 // return current position of file pointer | |
| 3776 jlong os::current_file_offset(int fd) { | |
| 3777 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
| 3778 } | |
| 3779 | |
| 3780 // move file pointer to the specified offset | |
| 3781 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 3782 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
| 3783 } | |
| 3784 | |
| 3785 // This code originates from JDK's sysAvailable | |
| 3786 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
| 3787 | |
| 3788 int os::available(int fd, jlong *bytes) { | |
| 3789 jlong cur, end; | |
| 3790 int mode; | |
| 3791 struct stat buf; | |
| 3792 | |
| 3793 if (::fstat(fd, &buf) >= 0) { | |
| 3794 mode = buf.st_mode; | |
| 3795 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
| 3796 /* | |
| 3797 * XXX: is the following call interruptible? If so, this might | |
| 3798 * need to go through the INTERRUPT_IO() wrapper as for other | |
| 3799 * blocking, interruptible calls in this file. | |
| 3800 */ | |
| 3801 int n; | |
| 3802 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
| 3803 *bytes = n; | |
| 3804 return 1; | |
| 3805 } | |
| 3806 } | |
| 3807 } | |
| 3808 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
| 3809 return 0; | |
| 3810 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
| 3811 return 0; | |
| 3812 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
| 3813 return 0; | |
| 3814 } | |
| 3815 *bytes = end - cur; | |
| 3816 return 1; | |
| 3817 } | |
| 3818 | |
| 3819 int os::socket_available(int fd, jint *pbytes) { | |
| 3820 if (fd < 0) | |
| 3821 return OS_OK; | |
| 3822 | |
| 3823 int ret; | |
| 3824 | |
| 3825 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
| 3826 | |
| 3827 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
| 3828 // is expected to return 0 on failure and 1 on success to the jdk. | |
| 3829 | |
| 3830 return (ret == OS_ERR) ? 0 : 1; | |
| 3831 } | |
| 3832 | |
| 3833 // Map a block of memory. | |
| 6197 | 3834 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 3835 char *addr, size_t bytes, bool read_only, |
| 3836 bool allow_exec) { | |
| 3837 int prot; | |
| 3838 int flags; | |
| 3839 | |
| 3840 if (read_only) { | |
| 3841 prot = PROT_READ; | |
| 3842 flags = MAP_SHARED; | |
| 3843 } else { | |
| 3844 prot = PROT_READ | PROT_WRITE; | |
| 3845 flags = MAP_PRIVATE; | |
| 3846 } | |
| 3847 | |
| 3848 if (allow_exec) { | |
| 3849 prot |= PROT_EXEC; | |
| 3850 } | |
| 3851 | |
| 3852 if (addr != NULL) { | |
| 3853 flags |= MAP_FIXED; | |
| 3854 } | |
| 3855 | |
| 3856 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
| 3857 fd, file_offset); | |
| 3858 if (mapped_address == MAP_FAILED) { | |
| 3859 return NULL; | |
| 3860 } | |
| 3861 return mapped_address; | |
| 3862 } | |
| 3863 | |
| 3864 | |
| 3865 // Remap a block of memory. | |
| 6197 | 3866 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 3867 char *addr, size_t bytes, bool read_only, |
| 3868 bool allow_exec) { | |
| 3869 // same as map_memory() on this OS | |
| 3870 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 3871 allow_exec); | |
| 3872 } | |
| 3873 | |
| 3874 | |
| 3875 // Unmap a block of memory. | |
| 6197 | 3876 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| 3960 | 3877 return munmap(addr, bytes) == 0; |
| 3878 } | |
| 3879 | |
| 3880 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 3881 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 3882 // of a thread. | |
| 3883 // | |
| 3884 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 3885 // the fast estimate available on the platform. | |
| 3886 | |
| 3887 jlong os::current_thread_cpu_time() { | |
| 3888 #ifdef __APPLE__ | |
| 3889 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
| 3890 #endif | |
| 3891 } | |
| 3892 | |
| 3893 jlong os::thread_cpu_time(Thread* thread) { | |
| 3894 } | |
| 3895 | |
| 3896 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 3897 #ifdef __APPLE__ | |
| 3898 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
| 3899 #endif | |
| 3900 } | |
| 3901 | |
| 3902 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 3903 #ifdef __APPLE__ | |
| 3904 struct thread_basic_info tinfo; | |
| 3905 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
| 3906 kern_return_t kr; | |
|
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3907 thread_t mach_thread; |
|
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3908 |
|
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3909 mach_thread = thread->osthread()->thread_id(); |
| 3960 | 3910 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
| 3911 if (kr != KERN_SUCCESS) | |
| 3912 return -1; | |
| 3913 | |
| 3914 if (user_sys_cpu_time) { | |
| 3915 jlong nanos; | |
| 3916 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
| 3917 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
| 3918 return nanos; | |
| 3919 } else { | |
| 3920 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
| 3921 } | |
| 3922 #endif | |
| 3923 } | |
| 3924 | |
| 3925 | |
| 3926 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 3927 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 3928 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 3929 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 3930 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 3931 } | |
| 3932 | |
| 3933 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 3934 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 3935 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 3936 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 3937 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 3938 } | |
| 3939 | |
| 3940 bool os::is_thread_cpu_time_supported() { | |
| 3941 #ifdef __APPLE__ | |
| 3942 return true; | |
| 6918 | 3943 #else |
| 3960 | 3944 return false; |
| 3945 #endif | |
| 3946 } | |
| 3947 | |
| 3948 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 3949 // Bsd doesn't yet have a (official) notion of processor sets, | |
| 3950 // so just return the system wide load average. | |
| 3951 int os::loadavg(double loadavg[], int nelem) { | |
| 3952 return ::getloadavg(loadavg, nelem); | |
| 3953 } | |
| 3954 | |
| 3955 void os::pause() { | |
| 3956 char filename[MAX_PATH]; | |
| 3957 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 3958 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 3959 } else { | |
| 3960 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 3961 } | |
| 3962 | |
| 3963 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 3964 if (fd != -1) { | |
| 3965 struct stat buf; | |
| 3966 ::close(fd); | |
| 3967 while (::stat(filename, &buf) == 0) { | |
| 3968 (void)::poll(NULL, 0, 100); | |
| 3969 } | |
| 3970 } else { | |
| 3971 jio_fprintf(stderr, | |
| 3972 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 3973 } | |
| 3974 } | |
| 3975 | |
| 3976 | |
| 3977 // Refer to the comments in os_solaris.cpp park-unpark. | |
| 3978 // | |
| 3979 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
| 3980 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
| 3981 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
| 3982 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
| 3983 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
| 3984 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
| 3985 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
| 3986 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
| 3987 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
| 3988 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
| 3989 // of libpthread avoids the problem, but isn't practical. | |
| 3990 // | |
| 3991 // Possible remedies: | |
| 3992 // | |
| 3993 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
| 3994 // This is palliative and probabilistic, however. If the thread is preempted | |
| 3995 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
| 3996 // than the minimum period may have passed, and the abstime may be stale (in the | |
| 3997 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
| 3998 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
| 3999 // | |
| 4000 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
| 4001 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
| 4002 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
| 4003 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
| 4004 // thread. | |
| 4005 // | |
| 4006 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
| 4007 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
| 4008 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
| 4009 // This also works well. In fact it avoids kernel-level scalability impediments | |
| 4010 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
| 4011 // timers in a graceful fashion. | |
| 4012 // | |
| 4013 // 4. When the abstime value is in the past it appears that control returns | |
| 4014 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
| 4015 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
| 4016 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
| 4017 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
| 4018 // It may be possible to avoid reinitialization by checking the return | |
| 4019 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
| 4020 // condvar we must establish the invariant that cond_signal() is only called | |
| 4021 // within critical sections protected by the adjunct mutex. This prevents | |
| 4022 // cond_signal() from "seeing" a condvar that's in the midst of being | |
| 4023 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
| 4024 // desirable signal-after-unlock optimization that avoids futile context switching. | |
| 4025 // | |
| 4026 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
| 4027 // structure when a condvar is used or initialized. cond_destroy() would | |
| 4028 // release the helper structure. Our reinitialize-after-timedwait fix | |
| 4029 // put excessive stress on malloc/free and locks protecting the c-heap. | |
| 4030 // | |
| 4031 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
| 4032 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
| 4033 // and only enabling the work-around for vulnerable environments. | |
| 4034 | |
| 4035 // utility to compute the abstime argument to timedwait: | |
| 4036 // millis is the relative timeout time | |
| 4037 // abstime will be the absolute timeout time | |
| 4038 // TODO: replace compute_abstime() with unpackTime() | |
| 4039 | |
| 4040 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
| 4041 if (millis < 0) millis = 0; | |
| 4042 struct timeval now; | |
| 4043 int status = gettimeofday(&now, NULL); | |
| 4044 assert(status == 0, "gettimeofday"); | |
| 4045 jlong seconds = millis / 1000; | |
| 4046 millis %= 1000; | |
| 4047 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
| 4048 seconds = 50000000; | |
| 4049 } | |
| 4050 abstime->tv_sec = now.tv_sec + seconds; | |
| 4051 long usec = now.tv_usec + millis * 1000; | |
| 4052 if (usec >= 1000000) { | |
| 4053 abstime->tv_sec += 1; | |
| 4054 usec -= 1000000; | |
| 4055 } | |
| 4056 abstime->tv_nsec = usec * 1000; | |
| 4057 return abstime; | |
| 4058 } | |
| 4059 | |
| 4060 | |
| 4061 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
| 4062 // Conceptually TryPark() should be equivalent to park(0). | |
| 4063 | |
| 4064 int os::PlatformEvent::TryPark() { | |
| 4065 for (;;) { | |
| 4066 const int v = _Event ; | |
| 4067 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 4068 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
| 4069 } | |
| 4070 } | |
| 4071 | |
| 4072 void os::PlatformEvent::park() { // AKA "down()" | |
| 4073 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 4074 // may call park(). | |
| 4075 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
| 4076 int v ; | |
| 4077 for (;;) { | |
| 4078 v = _Event ; | |
| 4079 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4080 } | |
| 4081 guarantee (v >= 0, "invariant") ; | |
| 4082 if (v == 0) { | |
| 4083 // Do this the hard way by blocking ... | |
| 4084 int status = pthread_mutex_lock(_mutex); | |
| 4085 assert_status(status == 0, status, "mutex_lock"); | |
| 4086 guarantee (_nParked == 0, "invariant") ; | |
| 4087 ++ _nParked ; | |
| 4088 while (_Event < 0) { | |
| 4089 status = pthread_cond_wait(_cond, _mutex); | |
| 4090 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
| 4091 // Treat this the same as if the wait was interrupted | |
| 4092 if (status == ETIMEDOUT) { status = EINTR; } | |
| 4093 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
| 4094 } | |
| 4095 -- _nParked ; | |
| 4096 | |
| 4097 _Event = 0 ; | |
| 4098 status = pthread_mutex_unlock(_mutex); | |
| 4099 assert_status(status == 0, status, "mutex_unlock"); | |
|
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4100 // Paranoia to ensure our locked and lock-free paths interact |
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4101 // correctly with each other. |
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4102 OrderAccess::fence(); |
| 3960 | 4103 } |
| 4104 guarantee (_Event >= 0, "invariant") ; | |
| 4105 } | |
| 4106 | |
| 4107 int os::PlatformEvent::park(jlong millis) { | |
| 4108 guarantee (_nParked == 0, "invariant") ; | |
| 4109 | |
| 4110 int v ; | |
| 4111 for (;;) { | |
| 4112 v = _Event ; | |
| 4113 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 4114 } | |
| 4115 guarantee (v >= 0, "invariant") ; | |
| 4116 if (v != 0) return OS_OK ; | |
| 4117 | |
| 4118 // We do this the hard way, by blocking the thread. | |
| 4119 // Consider enforcing a minimum timeout value. | |
| 4120 struct timespec abst; | |
| 4121 compute_abstime(&abst, millis); | |
| 4122 | |
| 4123 int ret = OS_TIMEOUT; | |
| 4124 int status = pthread_mutex_lock(_mutex); | |
| 4125 assert_status(status == 0, status, "mutex_lock"); | |
| 4126 guarantee (_nParked == 0, "invariant") ; | |
| 4127 ++_nParked ; | |
| 4128 | |
| 4129 // Object.wait(timo) will return because of | |
| 4130 // (a) notification | |
| 4131 // (b) timeout | |
| 4132 // (c) thread.interrupt | |
| 4133 // | |
| 4134 // Thread.interrupt and object.notify{All} both call Event::set. | |
| 4135 // That is, we treat thread.interrupt as a special case of notification. | |
| 4136 // The underlying Solaris implementation, cond_timedwait, admits | |
| 4137 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
| 4138 // JVM from making those visible to Java code. As such, we must | |
| 4139 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
| 4140 // | |
| 4141 // TODO: properly differentiate simultaneous notify+interrupt. | |
| 4142 // In that case, we should propagate the notify to another waiter. | |
| 4143 | |
| 4144 while (_Event < 0) { | |
| 4145 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
| 4146 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4147 pthread_cond_destroy (_cond); | |
| 4148 pthread_cond_init (_cond, NULL) ; | |
| 4149 } | |
| 4150 assert_status(status == 0 || status == EINTR || | |
| 4151 status == ETIMEDOUT, | |
| 4152 status, "cond_timedwait"); | |
| 4153 if (!FilterSpuriousWakeups) break ; // previous semantics | |
| 4154 if (status == ETIMEDOUT) break ; | |
| 4155 // We consume and ignore EINTR and spurious wakeups. | |
| 4156 } | |
| 4157 --_nParked ; | |
| 4158 if (_Event >= 0) { | |
| 4159 ret = OS_OK; | |
| 4160 } | |
| 4161 _Event = 0 ; | |
| 4162 status = pthread_mutex_unlock(_mutex); | |
| 4163 assert_status(status == 0, status, "mutex_unlock"); | |
| 4164 assert (_nParked == 0, "invariant") ; | |
|
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4165 // Paranoia to ensure our locked and lock-free paths interact |
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4166 // correctly with each other. |
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4167 OrderAccess::fence(); |
| 3960 | 4168 return ret; |
| 4169 } | |
| 4170 | |
| 4171 void os::PlatformEvent::unpark() { | |
|
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4172 // Transitions for _Event: |
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4173 // 0 :=> 1 |
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4174 // 1 :=> 1 |
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4175 // -1 :=> either 0 or 1; must signal target thread |
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4176 // That is, we can safely transition _Event from -1 to either |
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4177 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back |
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4178 // unpark() calls. |
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4179 // See also: "Semaphores in Plan 9" by Mullender & Cox |
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4180 // |
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|
4181 // Note: Forcing a transition from "-1" to "1" on an unpark() means |
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4182 // that it will take two back-to-back park() calls for the owning |
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4183 // thread to block. This has the benefit of forcing a spurious return |
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4184 // from the first park() call after an unpark() call which will help |
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4185 // shake out uses of park() and unpark() without condition variables. |
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4186 |
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4187 if (Atomic::xchg(1, &_Event) >= 0) return; |
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4188 |
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4189 // Wait for the thread associated with the event to vacate |
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4190 int status = pthread_mutex_lock(_mutex); |
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4191 assert_status(status == 0, status, "mutex_lock"); |
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4192 int AnyWaiters = _nParked; |
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4193 assert(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); |
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4194 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { |
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4195 AnyWaiters = 0; |
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4196 pthread_cond_signal(_cond); |
| 3960 | 4197 } |
|
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4198 status = pthread_mutex_unlock(_mutex); |
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4199 assert_status(status == 0, status, "mutex_unlock"); |
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4200 if (AnyWaiters != 0) { |
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4201 status = pthread_cond_signal(_cond); |
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|
4202 assert_status(status == 0, status, "cond_signal"); |
| 3960 | 4203 } |
| 4204 | |
| 4205 // Note that we signal() _after dropping the lock for "immortal" Events. | |
| 4206 // This is safe and avoids a common class of futile wakeups. In rare | |
| 4207 // circumstances this can cause a thread to return prematurely from | |
| 4208 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
| 4209 // simply re-test the condition and re-park itself. | |
| 4210 } | |
| 4211 | |
| 4212 | |
| 4213 // JSR166 | |
| 4214 // ------------------------------------------------------- | |
| 4215 | |
| 4216 /* | |
| 4217 * The solaris and bsd implementations of park/unpark are fairly | |
| 4218 * conservative for now, but can be improved. They currently use a | |
| 4219 * mutex/condvar pair, plus a a count. | |
| 4220 * Park decrements count if > 0, else does a condvar wait. Unpark | |
| 4221 * sets count to 1 and signals condvar. Only one thread ever waits | |
| 4222 * on the condvar. Contention seen when trying to park implies that someone | |
| 4223 * is unparking you, so don't wait. And spurious returns are fine, so there | |
| 4224 * is no need to track notifications. | |
| 4225 */ | |
| 4226 | |
| 4227 #define MAX_SECS 100000000 | |
| 4228 /* | |
| 4229 * This code is common to bsd and solaris and will be moved to a | |
| 4230 * common place in dolphin. | |
| 4231 * | |
| 4232 * The passed in time value is either a relative time in nanoseconds | |
| 4233 * or an absolute time in milliseconds. Either way it has to be unpacked | |
| 4234 * into suitable seconds and nanoseconds components and stored in the | |
| 4235 * given timespec structure. | |
| 4236 * Given time is a 64-bit value and the time_t used in the timespec is only | |
| 4237 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
| 4238 * overflow if times way in the future are given. Further on Solaris versions | |
| 4239 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
| 4240 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
| 4241 * As it will be 28 years before "now + 100000000" will overflow we can | |
| 4242 * ignore overflow and just impose a hard-limit on seconds using the value | |
| 4243 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
| 4244 * years from "now". | |
| 4245 */ | |
| 4246 | |
| 4247 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
| 4248 assert (time > 0, "convertTime"); | |
| 4249 | |
| 4250 struct timeval now; | |
| 4251 int status = gettimeofday(&now, NULL); | |
| 4252 assert(status == 0, "gettimeofday"); | |
| 4253 | |
| 4254 time_t max_secs = now.tv_sec + MAX_SECS; | |
| 4255 | |
| 4256 if (isAbsolute) { | |
| 4257 jlong secs = time / 1000; | |
| 4258 if (secs > max_secs) { | |
| 4259 absTime->tv_sec = max_secs; | |
| 4260 } | |
| 4261 else { | |
| 4262 absTime->tv_sec = secs; | |
| 4263 } | |
| 4264 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
| 4265 } | |
| 4266 else { | |
| 4267 jlong secs = time / NANOSECS_PER_SEC; | |
| 4268 if (secs >= MAX_SECS) { | |
| 4269 absTime->tv_sec = max_secs; | |
| 4270 absTime->tv_nsec = 0; | |
| 4271 } | |
| 4272 else { | |
| 4273 absTime->tv_sec = now.tv_sec + secs; | |
| 4274 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
| 4275 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
| 4276 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
| 4277 ++absTime->tv_sec; // note: this must be <= max_secs | |
| 4278 } | |
| 4279 } | |
| 4280 } | |
| 4281 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
| 4282 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
| 4283 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
| 4284 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
| 4285 } | |
| 4286 | |
| 4287 void Parker::park(bool isAbsolute, jlong time) { | |
|
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4288 // Ideally we'd do something useful while spinning, such |
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|
4289 // as calling unpackTime(). |
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|
4290 |
| 3960 | 4291 // Optional fast-path check: |
| 4292 // Return immediately if a permit is available. | |
|
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4293 // We depend on Atomic::xchg() having full barrier semantics |
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|
4294 // since we are doing a lock-free update to _counter. |
|
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|
4295 if (Atomic::xchg(0, &_counter) > 0) return; |
| 3960 | 4296 |
| 4297 Thread* thread = Thread::current(); | |
| 4298 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 4299 JavaThread *jt = (JavaThread *)thread; | |
| 4300 | |
| 4301 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
| 4302 // Check interrupt before trying to wait | |
| 4303 if (Thread::is_interrupted(thread, false)) { | |
| 4304 return; | |
| 4305 } | |
| 4306 | |
| 4307 // Next, demultiplex/decode time arguments | |
| 4308 struct timespec absTime; | |
| 4309 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
| 4310 return; | |
| 4311 } | |
| 4312 if (time > 0) { | |
| 4313 unpackTime(&absTime, isAbsolute, time); | |
| 4314 } | |
| 4315 | |
| 4316 | |
| 4317 // Enter safepoint region | |
| 4318 // Beware of deadlocks such as 6317397. | |
| 4319 // The per-thread Parker:: mutex is a classic leaf-lock. | |
| 4320 // In particular a thread must never block on the Threads_lock while | |
| 4321 // holding the Parker:: mutex. If safepoints are pending both the | |
| 4322 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
| 4323 ThreadBlockInVM tbivm(jt); | |
| 4324 | |
| 4325 // Don't wait if cannot get lock since interference arises from | |
| 4326 // unblocking. Also. check interrupt before trying wait | |
| 4327 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
| 4328 return; | |
| 4329 } | |
| 4330 | |
| 4331 int status ; | |
| 4332 if (_counter > 0) { // no wait needed | |
| 4333 _counter = 0; | |
| 4334 status = pthread_mutex_unlock(_mutex); | |
| 4335 assert (status == 0, "invariant") ; | |
|
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4336 // Paranoia to ensure our locked and lock-free paths interact |
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|
4337 // correctly with each other and Java-level accesses. |
| 3960 | 4338 OrderAccess::fence(); |
| 4339 return; | |
| 4340 } | |
| 4341 | |
| 4342 #ifdef ASSERT | |
| 4343 // Don't catch signals while blocked; let the running threads have the signals. | |
| 4344 // (This allows a debugger to break into the running thread.) | |
| 4345 sigset_t oldsigs; | |
| 4346 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
| 4347 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
| 4348 #endif | |
| 4349 | |
| 4350 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 4351 jt->set_suspend_equivalent(); | |
| 4352 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 4353 | |
| 4354 if (time == 0) { | |
| 4355 status = pthread_cond_wait (_cond, _mutex) ; | |
| 4356 } else { | |
| 4357 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
| 4358 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 4359 pthread_cond_destroy (_cond) ; | |
| 4360 pthread_cond_init (_cond, NULL); | |
| 4361 } | |
| 4362 } | |
| 4363 assert_status(status == 0 || status == EINTR || | |
| 4364 status == ETIMEDOUT, | |
| 4365 status, "cond_timedwait"); | |
| 4366 | |
| 4367 #ifdef ASSERT | |
| 4368 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
| 4369 #endif | |
| 4370 | |
| 4371 _counter = 0 ; | |
| 4372 status = pthread_mutex_unlock(_mutex) ; | |
| 4373 assert_status(status == 0, status, "invariant") ; | |
|
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|
4374 // Paranoia to ensure our locked and lock-free paths interact |
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|
4375 // correctly with each other and Java-level accesses. |
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|
4376 OrderAccess::fence(); |
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|
4377 |
| 3960 | 4378 // If externally suspended while waiting, re-suspend |
| 4379 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 4380 jt->java_suspend_self(); | |
| 4381 } | |
| 4382 } | |
| 4383 | |
| 4384 void Parker::unpark() { | |
| 4385 int s, status ; | |
| 4386 status = pthread_mutex_lock(_mutex); | |
| 4387 assert (status == 0, "invariant") ; | |
| 4388 s = _counter; | |
| 4389 _counter = 1; | |
| 4390 if (s < 1) { | |
| 4391 if (WorkAroundNPTLTimedWaitHang) { | |
| 4392 status = pthread_cond_signal (_cond) ; | |
| 4393 assert (status == 0, "invariant") ; | |
| 4394 status = pthread_mutex_unlock(_mutex); | |
| 4395 assert (status == 0, "invariant") ; | |
| 4396 } else { | |
| 4397 status = pthread_mutex_unlock(_mutex); | |
| 4398 assert (status == 0, "invariant") ; | |
| 4399 status = pthread_cond_signal (_cond) ; | |
| 4400 assert (status == 0, "invariant") ; | |
| 4401 } | |
| 4402 } else { | |
| 4403 pthread_mutex_unlock(_mutex); | |
| 4404 assert (status == 0, "invariant") ; | |
| 4405 } | |
| 4406 } | |
| 4407 | |
| 4408 | |
| 4409 /* Darwin has no "environ" in a dynamic library. */ | |
| 4410 #ifdef __APPLE__ | |
| 4411 #include <crt_externs.h> | |
| 4412 #define environ (*_NSGetEnviron()) | |
| 4413 #else | |
| 4414 extern char** environ; | |
| 4415 #endif | |
| 4416 | |
| 4417 // Run the specified command in a separate process. Return its exit value, | |
| 4418 // or -1 on failure (e.g. can't fork a new process). | |
| 4419 // Unlike system(), this function can be called from signal handler. It | |
| 4420 // doesn't block SIGINT et al. | |
| 4421 int os::fork_and_exec(char* cmd) { | |
| 4422 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
| 4423 | |
| 4424 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
| 4425 // pthread_atfork handlers and reset pthread library. All we need is a | |
| 4426 // separate process to execve. Make a direct syscall to fork process. | |
| 4427 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
| 4428 // the best... | |
| 4429 pid_t pid = fork(); | |
| 4430 | |
| 4431 if (pid < 0) { | |
| 4432 // fork failed | |
| 4433 return -1; | |
| 4434 | |
| 4435 } else if (pid == 0) { | |
| 4436 // child process | |
| 4437 | |
| 4438 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
| 4439 // first to kill every thread on the thread list. Because this list is | |
| 4440 // not reset by fork() (see notes above), execve() will instead kill | |
| 4441 // every thread in the parent process. We know this is the only thread | |
| 4442 // in the new process, so make a system call directly. | |
| 4443 // IA64 should use normal execve() from glibc to match the glibc fork() | |
| 4444 // above. | |
| 4445 execve("/bin/sh", (char* const*)argv, environ); | |
| 4446 | |
| 4447 // execve failed | |
| 4448 _exit(-1); | |
| 4449 | |
| 4450 } else { | |
| 4451 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
| 4452 // care about the actual exit code, for now. | |
| 4453 | |
| 4454 int status; | |
| 4455 | |
| 4456 // Wait for the child process to exit. This returns immediately if | |
| 4457 // the child has already exited. */ | |
| 4458 while (waitpid(pid, &status, 0) < 0) { | |
| 4459 switch (errno) { | |
| 4460 case ECHILD: return 0; | |
| 4461 case EINTR: break; | |
| 4462 default: return -1; | |
| 4463 } | |
| 4464 } | |
| 4465 | |
| 4466 if (WIFEXITED(status)) { | |
| 4467 // The child exited normally; get its exit code. | |
| 4468 return WEXITSTATUS(status); | |
| 4469 } else if (WIFSIGNALED(status)) { | |
| 4470 // The child exited because of a signal | |
| 4471 // The best value to return is 0x80 + signal number, | |
| 4472 // because that is what all Unix shells do, and because | |
| 4473 // it allows callers to distinguish between process exit and | |
| 4474 // process death by signal. | |
| 4475 return 0x80 + WTERMSIG(status); | |
| 4476 } else { | |
| 4477 // Unknown exit code; pass it through | |
| 4478 return status; | |
| 4479 } | |
| 4480 } | |
| 4481 } | |
| 4482 | |
| 4483 // is_headless_jre() | |
| 4484 // | |
|
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|
4485 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
| 3960 | 4486 // in order to report if we are running in a headless jre |
| 4487 // | |
|
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4488 // Since JDK8 xawt/libmawt.so was moved into the same directory |
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|
4489 // as libawt.so, and renamed libawt_xawt.so |
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|
4490 // |
| 3960 | 4491 bool os::is_headless_jre() { |
| 4492 struct stat statbuf; | |
| 4493 char buf[MAXPATHLEN]; | |
| 4494 char libmawtpath[MAXPATHLEN]; | |
| 4006 | 4495 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
| 5921 | 4496 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
| 3960 | 4497 char *p; |
| 4498 | |
| 4499 // Get path to libjvm.so | |
| 4500 os::jvm_path(buf, sizeof(buf)); | |
| 4501 | |
| 4502 // Get rid of libjvm.so | |
| 4503 p = strrchr(buf, '/'); | |
| 4504 if (p == NULL) return false; | |
| 4505 else *p = '\0'; | |
| 4506 | |
| 4507 // Get rid of client or server | |
| 4508 p = strrchr(buf, '/'); | |
| 4509 if (p == NULL) return false; | |
| 4510 else *p = '\0'; | |
| 4511 | |
| 4512 // check xawt/libmawt.so | |
| 4513 strcpy(libmawtpath, buf); | |
| 4514 strcat(libmawtpath, xawtstr); | |
| 4515 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
| 4516 | |
|
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|
4517 // check libawt_xawt.so |
| 3960 | 4518 strcpy(libmawtpath, buf); |
|
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|
4519 strcat(libmawtpath, new_xawtstr); |
| 3960 | 4520 if (::stat(libmawtpath, &statbuf) == 0) return false; |
| 4521 | |
| 4522 return true; | |
| 4523 } | |
|
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|
4524 |
|
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|
4525 // Get the default path to the core file |
|
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|
4526 // Returns the length of the string |
|
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|
4527 int os::get_core_path(char* buffer, size_t bufferSize) { |
|
65906dc96aa1
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|
4528 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
|
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|
4529 |
|
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|
4530 // Truncate if theoretical string was longer than bufferSize |
|
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|
4531 n = MIN2(n, (int)bufferSize); |
|
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mikael
parents:
6197
diff
changeset
|
4532 |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4533 return n; |
|
65906dc96aa1
7129724: MAC: Core file location is wrong in crash report
mikael
parents:
6197
diff
changeset
|
4534 } |