Mercurial > hg > truffle
annotate src/os/bsd/vm/os_bsd.cpp @ 6258:3b01d0321dfa
7186778: MachO decoder implementation for MacOSX
Summary: Implementation of decoder for Apple's MacOSX. The implementation is based on the patch provided by Kevin Walls.
Reviewed-by: coleenp, kamg, kevinw
| author | zgu |
|---|---|
| date | Mon, 30 Jul 2012 10:25:52 -0400 |
| parents | 65906dc96aa1 |
| children | 957c266d8bc5 bf2edd3c9b0f |
| rev | line source |
|---|---|
| 3960 | 1 /* |
|
4854
de268c8a8075
7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60 on Solaris 10 and 11
phh
parents:
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changeset
|
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
| 3960 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // no precompiled headers | |
| 26 #include "classfile/classLoader.hpp" | |
| 27 #include "classfile/systemDictionary.hpp" | |
| 28 #include "classfile/vmSymbols.hpp" | |
| 29 #include "code/icBuffer.hpp" | |
| 30 #include "code/vtableStubs.hpp" | |
| 31 #include "compiler/compileBroker.hpp" | |
| 32 #include "interpreter/interpreter.hpp" | |
| 33 #include "jvm_bsd.h" | |
| 34 #include "memory/allocation.inline.hpp" | |
| 35 #include "memory/filemap.hpp" | |
| 36 #include "mutex_bsd.inline.hpp" | |
| 37 #include "oops/oop.inline.hpp" | |
| 38 #include "os_share_bsd.hpp" | |
| 39 #include "prims/jniFastGetField.hpp" | |
| 40 #include "prims/jvm.h" | |
| 41 #include "prims/jvm_misc.hpp" | |
| 42 #include "runtime/arguments.hpp" | |
| 43 #include "runtime/extendedPC.hpp" | |
| 44 #include "runtime/globals.hpp" | |
| 45 #include "runtime/interfaceSupport.hpp" | |
| 46 #include "runtime/java.hpp" | |
| 47 #include "runtime/javaCalls.hpp" | |
| 48 #include "runtime/mutexLocker.hpp" | |
| 49 #include "runtime/objectMonitor.hpp" | |
| 50 #include "runtime/osThread.hpp" | |
| 51 #include "runtime/perfMemory.hpp" | |
| 52 #include "runtime/sharedRuntime.hpp" | |
| 53 #include "runtime/statSampler.hpp" | |
| 54 #include "runtime/stubRoutines.hpp" | |
| 55 #include "runtime/threadCritical.hpp" | |
| 56 #include "runtime/timer.hpp" | |
| 57 #include "services/attachListener.hpp" | |
| 58 #include "services/runtimeService.hpp" | |
| 59 #include "thread_bsd.inline.hpp" | |
| 60 #include "utilities/decoder.hpp" | |
| 61 #include "utilities/defaultStream.hpp" | |
| 62 #include "utilities/events.hpp" | |
| 63 #include "utilities/growableArray.hpp" | |
| 64 #include "utilities/vmError.hpp" | |
| 65 #ifdef TARGET_ARCH_x86 | |
| 66 # include "assembler_x86.inline.hpp" | |
| 67 # include "nativeInst_x86.hpp" | |
| 68 #endif | |
| 69 #ifdef TARGET_ARCH_sparc | |
| 70 # include "assembler_sparc.inline.hpp" | |
| 71 # include "nativeInst_sparc.hpp" | |
| 72 #endif | |
| 73 #ifdef TARGET_ARCH_zero | |
| 74 # include "assembler_zero.inline.hpp" | |
| 75 # include "nativeInst_zero.hpp" | |
| 76 #endif | |
| 77 #ifdef TARGET_ARCH_arm | |
| 78 # include "assembler_arm.inline.hpp" | |
| 79 # include "nativeInst_arm.hpp" | |
| 80 #endif | |
| 81 #ifdef TARGET_ARCH_ppc | |
| 82 # include "assembler_ppc.inline.hpp" | |
| 83 # include "nativeInst_ppc.hpp" | |
| 84 #endif | |
| 85 #ifdef COMPILER1 | |
| 86 #include "c1/c1_Runtime1.hpp" | |
| 87 #endif | |
| 88 #ifdef COMPILER2 | |
| 89 #include "opto/runtime.hpp" | |
| 90 #endif | |
| 91 | |
| 92 // put OS-includes here | |
| 93 # include <sys/types.h> | |
| 94 # include <sys/mman.h> | |
| 95 # include <sys/stat.h> | |
| 96 # include <sys/select.h> | |
| 97 # include <pthread.h> | |
| 98 # include <signal.h> | |
| 99 # include <errno.h> | |
| 100 # include <dlfcn.h> | |
| 101 # include <stdio.h> | |
| 102 # include <unistd.h> | |
| 103 # include <sys/resource.h> | |
| 104 # include <pthread.h> | |
| 105 # include <sys/stat.h> | |
| 106 # include <sys/time.h> | |
| 107 # include <sys/times.h> | |
| 108 # include <sys/utsname.h> | |
| 109 # include <sys/socket.h> | |
| 110 # include <sys/wait.h> | |
| 111 # include <time.h> | |
| 112 # include <pwd.h> | |
| 113 # include <poll.h> | |
| 114 # include <semaphore.h> | |
| 115 # include <fcntl.h> | |
| 116 # include <string.h> | |
| 117 #ifdef _ALLBSD_SOURCE | |
| 118 # include <sys/param.h> | |
| 119 # include <sys/sysctl.h> | |
| 120 #else | |
| 121 # include <syscall.h> | |
| 122 # include <sys/sysinfo.h> | |
| 123 # include <gnu/libc-version.h> | |
| 124 #endif | |
| 125 # include <sys/ipc.h> | |
| 126 # include <sys/shm.h> | |
| 127 #ifndef __APPLE__ | |
| 128 # include <link.h> | |
| 129 #endif | |
| 130 # include <stdint.h> | |
| 131 # include <inttypes.h> | |
| 132 # include <sys/ioctl.h> | |
| 133 | |
| 134 #if defined(__FreeBSD__) || defined(__NetBSD__) | |
| 135 # include <elf.h> | |
| 136 #endif | |
| 137 | |
| 138 #ifdef __APPLE__ | |
| 4006 | 139 # include <mach/mach.h> // semaphore_* API |
| 140 # include <mach-o/dyld.h> | |
| 141 # include <sys/proc_info.h> | |
| 142 # include <objc/objc-auto.h> | |
| 3960 | 143 #endif |
| 144 | |
| 145 #ifndef MAP_ANONYMOUS | |
| 146 #define MAP_ANONYMOUS MAP_ANON | |
| 147 #endif | |
| 148 | |
| 149 #define MAX_PATH (2 * K) | |
| 150 | |
| 151 // for timer info max values which include all bits | |
| 152 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) | |
| 153 | |
| 154 #define LARGEPAGES_BIT (1 << 6) | |
| 155 //////////////////////////////////////////////////////////////////////////////// | |
| 156 // global variables | |
| 157 julong os::Bsd::_physical_memory = 0; | |
| 158 | |
| 159 #ifndef _ALLBSD_SOURCE | |
| 160 address os::Bsd::_initial_thread_stack_bottom = NULL; | |
| 161 uintptr_t os::Bsd::_initial_thread_stack_size = 0; | |
| 162 #endif | |
| 163 | |
| 164 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL; | |
| 165 #ifndef _ALLBSD_SOURCE | |
| 166 int (*os::Bsd::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL; | |
| 167 Mutex* os::Bsd::_createThread_lock = NULL; | |
| 168 #endif | |
| 169 pthread_t os::Bsd::_main_thread; | |
| 170 int os::Bsd::_page_size = -1; | |
| 171 #ifndef _ALLBSD_SOURCE | |
| 172 bool os::Bsd::_is_floating_stack = false; | |
| 173 bool os::Bsd::_is_NPTL = false; | |
| 174 bool os::Bsd::_supports_fast_thread_cpu_time = false; | |
| 175 const char * os::Bsd::_glibc_version = NULL; | |
| 176 const char * os::Bsd::_libpthread_version = NULL; | |
| 177 #endif | |
| 178 | |
| 179 static jlong initial_time_count=0; | |
| 180 | |
| 181 static int clock_tics_per_sec = 100; | |
| 182 | |
| 183 // For diagnostics to print a message once. see run_periodic_checks | |
| 184 static sigset_t check_signal_done; | |
| 185 static bool check_signals = true;; | |
| 186 | |
| 187 static pid_t _initial_pid = 0; | |
| 188 | |
| 189 /* Signal number used to suspend/resume a thread */ | |
| 190 | |
| 191 /* do not use any signal number less than SIGSEGV, see 4355769 */ | |
| 192 static int SR_signum = SIGUSR2; | |
| 193 sigset_t SR_sigset; | |
| 194 | |
| 195 | |
| 196 //////////////////////////////////////////////////////////////////////////////// | |
| 197 // utility functions | |
| 198 | |
| 199 static int SR_initialize(); | |
| 200 static int SR_finalize(); | |
| 201 | |
| 202 julong os::available_memory() { | |
| 203 return Bsd::available_memory(); | |
| 204 } | |
| 205 | |
| 206 julong os::Bsd::available_memory() { | |
| 207 #ifdef _ALLBSD_SOURCE | |
| 208 // XXXBSD: this is just a stopgap implementation | |
| 209 return physical_memory() >> 2; | |
| 210 #else | |
| 211 // values in struct sysinfo are "unsigned long" | |
| 212 struct sysinfo si; | |
| 213 sysinfo(&si); | |
| 214 | |
| 215 return (julong)si.freeram * si.mem_unit; | |
| 216 #endif | |
| 217 } | |
| 218 | |
| 219 julong os::physical_memory() { | |
| 220 return Bsd::physical_memory(); | |
| 221 } | |
| 222 | |
| 223 julong os::allocatable_physical_memory(julong size) { | |
| 224 #ifdef _LP64 | |
| 225 return size; | |
| 226 #else | |
| 227 julong result = MIN2(size, (julong)3800*M); | |
| 228 if (!is_allocatable(result)) { | |
| 229 // See comments under solaris for alignment considerations | |
| 230 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size(); | |
| 231 result = MIN2(size, reasonable_size); | |
| 232 } | |
| 233 return result; | |
| 234 #endif // _LP64 | |
| 235 } | |
| 236 | |
| 237 //////////////////////////////////////////////////////////////////////////////// | |
| 238 // environment support | |
| 239 | |
| 240 bool os::getenv(const char* name, char* buf, int len) { | |
| 241 const char* val = ::getenv(name); | |
| 242 if (val != NULL && strlen(val) < (size_t)len) { | |
| 243 strcpy(buf, val); | |
| 244 return true; | |
| 245 } | |
| 246 if (len > 0) buf[0] = 0; // return a null string | |
| 247 return false; | |
| 248 } | |
| 249 | |
| 250 | |
| 251 // Return true if user is running as root. | |
| 252 | |
| 253 bool os::have_special_privileges() { | |
| 254 static bool init = false; | |
| 255 static bool privileges = false; | |
| 256 if (!init) { | |
| 257 privileges = (getuid() != geteuid()) || (getgid() != getegid()); | |
| 258 init = true; | |
| 259 } | |
| 260 return privileges; | |
| 261 } | |
| 262 | |
| 263 | |
| 264 #ifndef _ALLBSD_SOURCE | |
| 265 #ifndef SYS_gettid | |
| 266 // i386: 224, ia64: 1105, amd64: 186, sparc 143 | |
| 267 #ifdef __ia64__ | |
| 268 #define SYS_gettid 1105 | |
| 269 #elif __i386__ | |
| 270 #define SYS_gettid 224 | |
| 271 #elif __amd64__ | |
| 272 #define SYS_gettid 186 | |
| 273 #elif __sparc__ | |
| 274 #define SYS_gettid 143 | |
| 275 #else | |
| 276 #error define gettid for the arch | |
| 277 #endif | |
| 278 #endif | |
| 279 #endif | |
| 280 | |
| 281 // Cpu architecture string | |
| 282 #if defined(ZERO) | |
| 283 static char cpu_arch[] = ZERO_LIBARCH; | |
| 284 #elif defined(IA64) | |
| 285 static char cpu_arch[] = "ia64"; | |
| 286 #elif defined(IA32) | |
| 287 static char cpu_arch[] = "i386"; | |
| 288 #elif defined(AMD64) | |
| 289 static char cpu_arch[] = "amd64"; | |
| 290 #elif defined(ARM) | |
| 291 static char cpu_arch[] = "arm"; | |
| 292 #elif defined(PPC) | |
| 293 static char cpu_arch[] = "ppc"; | |
| 294 #elif defined(SPARC) | |
| 295 # ifdef _LP64 | |
| 296 static char cpu_arch[] = "sparcv9"; | |
| 297 # else | |
| 298 static char cpu_arch[] = "sparc"; | |
| 299 # endif | |
| 300 #else | |
| 301 #error Add appropriate cpu_arch setting | |
| 302 #endif | |
| 303 | |
| 4846 | 304 // Compiler variant |
| 305 #ifdef COMPILER2 | |
| 306 #define COMPILER_VARIANT "server" | |
| 307 #else | |
| 308 #define COMPILER_VARIANT "client" | |
| 309 #endif | |
| 3960 | 310 |
| 311 #ifndef _ALLBSD_SOURCE | |
| 312 // pid_t gettid() | |
| 313 // | |
| 314 // Returns the kernel thread id of the currently running thread. Kernel | |
| 315 // thread id is used to access /proc. | |
| 316 // | |
| 317 // (Note that getpid() on BsdThreads returns kernel thread id too; but | |
| 318 // on NPTL, it returns the same pid for all threads, as required by POSIX.) | |
| 319 // | |
| 320 pid_t os::Bsd::gettid() { | |
| 321 int rslt = syscall(SYS_gettid); | |
| 322 if (rslt == -1) { | |
| 323 // old kernel, no NPTL support | |
| 324 return getpid(); | |
| 325 } else { | |
| 326 return (pid_t)rslt; | |
| 327 } | |
| 328 } | |
| 329 | |
| 330 // Most versions of bsd have a bug where the number of processors are | |
| 331 // determined by looking at the /proc file system. In a chroot environment, | |
| 332 // the system call returns 1. This causes the VM to act as if it is | |
| 333 // a single processor and elide locking (see is_MP() call). | |
| 334 static bool unsafe_chroot_detected = false; | |
| 335 static const char *unstable_chroot_error = "/proc file system not found.\n" | |
| 336 "Java may be unstable running multithreaded in a chroot " | |
| 337 "environment on Bsd when /proc filesystem is not mounted."; | |
| 338 #endif | |
| 339 | |
| 340 #ifdef _ALLBSD_SOURCE | |
| 341 void os::Bsd::initialize_system_info() { | |
| 342 int mib[2]; | |
| 343 size_t len; | |
| 344 int cpu_val; | |
| 345 u_long mem_val; | |
| 346 | |
| 347 /* get processors count via hw.ncpus sysctl */ | |
| 348 mib[0] = CTL_HW; | |
| 349 mib[1] = HW_NCPU; | |
| 350 len = sizeof(cpu_val); | |
| 351 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) { | |
| 352 set_processor_count(cpu_val); | |
| 353 } | |
| 354 else { | |
| 355 set_processor_count(1); // fallback | |
| 356 } | |
| 357 | |
| 358 /* get physical memory via hw.usermem sysctl (hw.usermem is used | |
| 359 * instead of hw.physmem because we need size of allocatable memory | |
| 360 */ | |
| 361 mib[0] = CTL_HW; | |
| 362 mib[1] = HW_USERMEM; | |
| 363 len = sizeof(mem_val); | |
| 364 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) | |
| 365 _physical_memory = mem_val; | |
| 366 else | |
| 367 _physical_memory = 256*1024*1024; // fallback (XXXBSD?) | |
| 368 | |
| 369 #ifdef __OpenBSD__ | |
| 370 { | |
| 371 // limit _physical_memory memory view on OpenBSD since | |
| 372 // datasize rlimit restricts us anyway. | |
| 373 struct rlimit limits; | |
| 374 getrlimit(RLIMIT_DATA, &limits); | |
| 375 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur); | |
| 376 } | |
| 377 #endif | |
| 378 } | |
| 379 #else | |
| 380 void os::Bsd::initialize_system_info() { | |
| 381 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); | |
| 382 if (processor_count() == 1) { | |
| 383 pid_t pid = os::Bsd::gettid(); | |
| 384 char fname[32]; | |
| 385 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid); | |
| 386 FILE *fp = fopen(fname, "r"); | |
| 387 if (fp == NULL) { | |
| 388 unsafe_chroot_detected = true; | |
| 389 } else { | |
| 390 fclose(fp); | |
| 391 } | |
| 392 } | |
| 393 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); | |
| 394 assert(processor_count() > 0, "bsd error"); | |
| 395 } | |
| 396 #endif | |
| 397 | |
| 4006 | 398 #ifdef __APPLE__ |
| 399 static const char *get_home() { | |
| 400 const char *home_dir = ::getenv("HOME"); | |
| 401 if ((home_dir == NULL) || (*home_dir == '\0')) { | |
| 402 struct passwd *passwd_info = getpwuid(geteuid()); | |
| 403 if (passwd_info != NULL) { | |
| 404 home_dir = passwd_info->pw_dir; | |
| 405 } | |
| 406 } | |
| 407 | |
| 408 return home_dir; | |
| 409 } | |
| 410 #endif | |
| 411 | |
| 3960 | 412 void os::init_system_properties_values() { |
| 413 // char arch[12]; | |
| 414 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); | |
| 415 | |
| 416 // The next steps are taken in the product version: | |
| 417 // | |
| 418 // Obtain the JAVA_HOME value from the location of libjvm[_g].so. | |
| 419 // This library should be located at: | |
| 420 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so. | |
| 421 // | |
| 422 // If "/jre/lib/" appears at the right place in the path, then we | |
| 423 // assume libjvm[_g].so is installed in a JDK and we use this path. | |
| 424 // | |
| 425 // Otherwise exit with message: "Could not create the Java virtual machine." | |
| 426 // | |
| 427 // The following extra steps are taken in the debugging version: | |
| 428 // | |
| 429 // If "/jre/lib/" does NOT appear at the right place in the path | |
| 430 // instead of exit check for $JAVA_HOME environment variable. | |
| 431 // | |
| 432 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, | |
| 433 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so | |
| 434 // it looks like libjvm[_g].so is installed there | |
| 435 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so. | |
| 436 // | |
| 437 // Otherwise exit. | |
| 438 // | |
| 439 // Important note: if the location of libjvm.so changes this | |
| 440 // code needs to be changed accordingly. | |
| 441 | |
| 442 // The next few definitions allow the code to be verbatim: | |
| 6197 | 443 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) |
| 3960 | 444 #define getenv(n) ::getenv(n) |
| 445 | |
| 446 /* | |
| 447 * See ld(1): | |
| 448 * The linker uses the following search paths to locate required | |
| 449 * shared libraries: | |
| 450 * 1: ... | |
| 451 * ... | |
| 452 * 7: The default directories, normally /lib and /usr/lib. | |
| 453 */ | |
| 454 #ifndef DEFAULT_LIBPATH | |
| 455 #define DEFAULT_LIBPATH "/lib:/usr/lib" | |
| 456 #endif | |
| 457 | |
| 458 #define EXTENSIONS_DIR "/lib/ext" | |
| 459 #define ENDORSED_DIR "/lib/endorsed" | |
| 460 #define REG_DIR "/usr/java/packages" | |
| 461 | |
| 4006 | 462 #ifdef __APPLE__ |
| 463 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions" | |
| 464 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java" | |
| 465 const char *user_home_dir = get_home(); | |
| 466 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir | |
| 467 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) + | |
| 468 sizeof(SYS_EXTENSIONS_DIRS); | |
| 469 #endif | |
| 470 | |
| 3960 | 471 { |
| 472 /* sysclasspath, java_home, dll_dir */ | |
| 473 { | |
| 474 char *home_path; | |
| 475 char *dll_path; | |
| 476 char *pslash; | |
| 477 char buf[MAXPATHLEN]; | |
| 478 os::jvm_path(buf, sizeof(buf)); | |
| 479 | |
| 480 // Found the full path to libjvm.so. | |
| 481 // Now cut the path to <java_home>/jre if we can. | |
| 482 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ | |
| 483 pslash = strrchr(buf, '/'); | |
| 484 if (pslash != NULL) | |
| 485 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ | |
| 486 dll_path = malloc(strlen(buf) + 1); | |
| 487 if (dll_path == NULL) | |
| 488 return; | |
| 489 strcpy(dll_path, buf); | |
| 490 Arguments::set_dll_dir(dll_path); | |
| 491 | |
| 492 if (pslash != NULL) { | |
| 493 pslash = strrchr(buf, '/'); | |
| 494 if (pslash != NULL) { | |
| 4006 | 495 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */ |
| 496 #ifndef __APPLE__ | |
| 3960 | 497 pslash = strrchr(buf, '/'); |
| 498 if (pslash != NULL) | |
| 499 *pslash = '\0'; /* get rid of /lib */ | |
| 4006 | 500 #endif |
| 3960 | 501 } |
| 502 } | |
| 503 | |
| 504 home_path = malloc(strlen(buf) + 1); | |
| 505 if (home_path == NULL) | |
| 506 return; | |
| 507 strcpy(home_path, buf); | |
| 508 Arguments::set_java_home(home_path); | |
| 509 | |
| 510 if (!set_boot_path('/', ':')) | |
| 511 return; | |
| 512 } | |
| 513 | |
| 514 /* | |
| 515 * Where to look for native libraries | |
| 516 * | |
| 517 * Note: Due to a legacy implementation, most of the library path | |
| 518 * is set in the launcher. This was to accomodate linking restrictions | |
| 519 * on legacy Bsd implementations (which are no longer supported). | |
| 520 * Eventually, all the library path setting will be done here. | |
| 521 * | |
| 522 * However, to prevent the proliferation of improperly built native | |
| 523 * libraries, the new path component /usr/java/packages is added here. | |
| 524 * Eventually, all the library path setting will be done here. | |
| 525 */ | |
| 526 { | |
| 527 char *ld_library_path; | |
| 528 | |
| 529 /* | |
| 530 * Construct the invariant part of ld_library_path. Note that the | |
| 531 * space for the colon and the trailing null are provided by the | |
| 532 * nulls included by the sizeof operator (so actually we allocate | |
| 533 * a byte more than necessary). | |
| 534 */ | |
| 4006 | 535 #ifdef __APPLE__ |
| 536 ld_library_path = (char *) malloc(system_ext_size); | |
| 537 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir); | |
| 538 #else | |
| 3960 | 539 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") + |
| 540 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH)); | |
| 541 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch); | |
| 4006 | 542 #endif |
| 3960 | 543 |
| 544 /* | |
| 545 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It | |
| 546 * should always exist (until the legacy problem cited above is | |
| 547 * addressed). | |
| 548 */ | |
| 549 #ifdef __APPLE__ | |
| 4006 | 550 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper |
| 551 char *l = getenv("JAVA_LIBRARY_PATH"); | |
| 552 if (l != NULL) { | |
| 553 char *t = ld_library_path; | |
| 554 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 555 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1); | |
| 556 sprintf(ld_library_path, "%s:%s", l, t); | |
| 557 free(t); | |
| 558 } | |
| 559 | |
| 3960 | 560 char *v = getenv("DYLD_LIBRARY_PATH"); |
| 561 #else | |
| 562 char *v = getenv("LD_LIBRARY_PATH"); | |
| 563 #endif | |
| 564 if (v != NULL) { | |
| 565 char *t = ld_library_path; | |
| 566 /* That's +1 for the colon and +1 for the trailing '\0' */ | |
| 567 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1); | |
| 568 sprintf(ld_library_path, "%s:%s", v, t); | |
| 4006 | 569 free(t); |
| 3960 | 570 } |
|
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571 |
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572 #ifdef __APPLE__ |
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573 // Apple's Java6 has "." at the beginning of java.library.path. |
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574 // OpenJDK on Windows has "." at the end of java.library.path. |
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575 // OpenJDK on Linux and Solaris don't have "." in java.library.path |
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576 // at all. To ease the transition from Apple's Java6 to OpenJDK7, |
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577 // "." is appended to the end of java.library.path. Yes, this |
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578 // could cause a change in behavior, but Apple's Java6 behavior |
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579 // can be achieved by putting "." at the beginning of the |
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580 // JAVA_LIBRARY_PATH environment variable. |
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581 { |
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582 char *t = ld_library_path; |
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583 // that's +3 for appending ":." and the trailing '\0' |
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584 ld_library_path = (char *) malloc(strlen(t) + 3); |
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585 sprintf(ld_library_path, "%s:%s", t, "."); |
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586 free(t); |
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587 } |
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588 #endif |
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589 |
| 3960 | 590 Arguments::set_library_path(ld_library_path); |
| 591 } | |
| 592 | |
| 593 /* | |
| 594 * Extensions directories. | |
| 595 * | |
| 596 * Note that the space for the colon and the trailing null are provided | |
| 597 * by the nulls included by the sizeof operator (so actually one byte more | |
| 598 * than necessary is allocated). | |
| 599 */ | |
| 600 { | |
| 4006 | 601 #ifdef __APPLE__ |
| 602 char *buf = malloc(strlen(Arguments::get_java_home()) + | |
| 603 sizeof(EXTENSIONS_DIR) + system_ext_size); | |
| 604 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":" | |
| 605 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home()); | |
| 606 #else | |
| 3960 | 607 char *buf = malloc(strlen(Arguments::get_java_home()) + |
| 608 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR)); | |
| 609 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR, | |
| 610 Arguments::get_java_home()); | |
| 4006 | 611 #endif |
| 612 | |
| 3960 | 613 Arguments::set_ext_dirs(buf); |
| 614 } | |
| 615 | |
| 616 /* Endorsed standards default directory. */ | |
| 617 { | |
| 618 char * buf; | |
| 619 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); | |
| 620 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); | |
| 621 Arguments::set_endorsed_dirs(buf); | |
| 622 } | |
| 623 } | |
| 624 | |
| 4006 | 625 #ifdef __APPLE__ |
| 626 #undef SYS_EXTENSIONS_DIR | |
| 627 #endif | |
| 3960 | 628 #undef malloc |
| 629 #undef getenv | |
| 630 #undef EXTENSIONS_DIR | |
| 631 #undef ENDORSED_DIR | |
| 632 | |
| 633 // Done | |
| 634 return; | |
| 635 } | |
| 636 | |
| 637 //////////////////////////////////////////////////////////////////////////////// | |
| 638 // breakpoint support | |
| 639 | |
| 640 void os::breakpoint() { | |
| 641 BREAKPOINT; | |
| 642 } | |
| 643 | |
| 644 extern "C" void breakpoint() { | |
| 645 // use debugger to set breakpoint here | |
| 646 } | |
| 647 | |
| 648 //////////////////////////////////////////////////////////////////////////////// | |
| 649 // signal support | |
| 650 | |
| 651 debug_only(static bool signal_sets_initialized = false); | |
| 652 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; | |
| 653 | |
| 654 bool os::Bsd::is_sig_ignored(int sig) { | |
| 655 struct sigaction oact; | |
| 656 sigaction(sig, (struct sigaction*)NULL, &oact); | |
| 657 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) | |
| 658 : CAST_FROM_FN_PTR(void*, oact.sa_handler); | |
| 659 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) | |
| 660 return true; | |
| 661 else | |
| 662 return false; | |
| 663 } | |
| 664 | |
| 665 void os::Bsd::signal_sets_init() { | |
| 666 // Should also have an assertion stating we are still single-threaded. | |
| 667 assert(!signal_sets_initialized, "Already initialized"); | |
| 668 // Fill in signals that are necessarily unblocked for all threads in | |
| 669 // the VM. Currently, we unblock the following signals: | |
| 670 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden | |
| 671 // by -Xrs (=ReduceSignalUsage)); | |
| 672 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all | |
| 673 // other threads. The "ReduceSignalUsage" boolean tells us not to alter | |
| 674 // the dispositions or masks wrt these signals. | |
| 675 // Programs embedding the VM that want to use the above signals for their | |
| 676 // own purposes must, at this time, use the "-Xrs" option to prevent | |
| 677 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. | |
| 678 // (See bug 4345157, and other related bugs). | |
| 679 // In reality, though, unblocking these signals is really a nop, since | |
| 680 // these signals are not blocked by default. | |
| 681 sigemptyset(&unblocked_sigs); | |
| 682 sigemptyset(&allowdebug_blocked_sigs); | |
| 683 sigaddset(&unblocked_sigs, SIGILL); | |
| 684 sigaddset(&unblocked_sigs, SIGSEGV); | |
| 685 sigaddset(&unblocked_sigs, SIGBUS); | |
| 686 sigaddset(&unblocked_sigs, SIGFPE); | |
| 687 sigaddset(&unblocked_sigs, SR_signum); | |
| 688 | |
| 689 if (!ReduceSignalUsage) { | |
| 690 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) { | |
| 691 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); | |
| 692 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); | |
| 693 } | |
| 694 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) { | |
| 695 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); | |
| 696 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); | |
| 697 } | |
| 698 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) { | |
| 699 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); | |
| 700 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); | |
| 701 } | |
| 702 } | |
| 703 // Fill in signals that are blocked by all but the VM thread. | |
| 704 sigemptyset(&vm_sigs); | |
| 705 if (!ReduceSignalUsage) | |
| 706 sigaddset(&vm_sigs, BREAK_SIGNAL); | |
| 707 debug_only(signal_sets_initialized = true); | |
| 708 | |
| 709 } | |
| 710 | |
| 711 // These are signals that are unblocked while a thread is running Java. | |
| 712 // (For some reason, they get blocked by default.) | |
| 713 sigset_t* os::Bsd::unblocked_signals() { | |
| 714 assert(signal_sets_initialized, "Not initialized"); | |
| 715 return &unblocked_sigs; | |
| 716 } | |
| 717 | |
| 718 // These are the signals that are blocked while a (non-VM) thread is | |
| 719 // running Java. Only the VM thread handles these signals. | |
| 720 sigset_t* os::Bsd::vm_signals() { | |
| 721 assert(signal_sets_initialized, "Not initialized"); | |
| 722 return &vm_sigs; | |
| 723 } | |
| 724 | |
| 725 // These are signals that are blocked during cond_wait to allow debugger in | |
| 726 sigset_t* os::Bsd::allowdebug_blocked_signals() { | |
| 727 assert(signal_sets_initialized, "Not initialized"); | |
| 728 return &allowdebug_blocked_sigs; | |
| 729 } | |
| 730 | |
| 731 void os::Bsd::hotspot_sigmask(Thread* thread) { | |
| 732 | |
| 733 //Save caller's signal mask before setting VM signal mask | |
| 734 sigset_t caller_sigmask; | |
| 735 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); | |
| 736 | |
| 737 OSThread* osthread = thread->osthread(); | |
| 738 osthread->set_caller_sigmask(caller_sigmask); | |
| 739 | |
| 740 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL); | |
| 741 | |
| 742 if (!ReduceSignalUsage) { | |
| 743 if (thread->is_VM_thread()) { | |
| 744 // Only the VM thread handles BREAK_SIGNAL ... | |
| 745 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); | |
| 746 } else { | |
| 747 // ... all other threads block BREAK_SIGNAL | |
| 748 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); | |
| 749 } | |
| 750 } | |
| 751 } | |
| 752 | |
| 753 #ifndef _ALLBSD_SOURCE | |
| 754 ////////////////////////////////////////////////////////////////////////////// | |
| 755 // detecting pthread library | |
| 756 | |
| 757 void os::Bsd::libpthread_init() { | |
| 758 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION | |
| 759 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a | |
| 760 // generic name for earlier versions. | |
| 761 // Define macros here so we can build HotSpot on old systems. | |
| 762 # ifndef _CS_GNU_LIBC_VERSION | |
| 763 # define _CS_GNU_LIBC_VERSION 2 | |
| 764 # endif | |
| 765 # ifndef _CS_GNU_LIBPTHREAD_VERSION | |
| 766 # define _CS_GNU_LIBPTHREAD_VERSION 3 | |
| 767 # endif | |
| 768 | |
| 769 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0); | |
| 770 if (n > 0) { | |
| 771 char *str = (char *)malloc(n); | |
| 772 confstr(_CS_GNU_LIBC_VERSION, str, n); | |
| 773 os::Bsd::set_glibc_version(str); | |
| 774 } else { | |
| 775 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version() | |
| 776 static char _gnu_libc_version[32]; | |
| 777 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version), | |
| 778 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release()); | |
| 779 os::Bsd::set_glibc_version(_gnu_libc_version); | |
| 780 } | |
| 781 | |
| 782 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0); | |
| 783 if (n > 0) { | |
| 784 char *str = (char *)malloc(n); | |
| 785 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n); | |
| 786 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells | |
| 787 // us "NPTL-0.29" even we are running with BsdThreads. Check if this | |
| 788 // is the case. BsdThreads has a hard limit on max number of threads. | |
| 789 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value. | |
| 790 // On the other hand, NPTL does not have such a limit, sysconf() | |
| 791 // will return -1 and errno is not changed. Check if it is really NPTL. | |
| 792 if (strcmp(os::Bsd::glibc_version(), "glibc 2.3.2") == 0 && | |
| 793 strstr(str, "NPTL") && | |
| 794 sysconf(_SC_THREAD_THREADS_MAX) > 0) { | |
| 795 free(str); | |
| 796 os::Bsd::set_libpthread_version("bsdthreads"); | |
| 797 } else { | |
| 798 os::Bsd::set_libpthread_version(str); | |
| 799 } | |
| 800 } else { | |
| 801 // glibc before 2.3.2 only has BsdThreads. | |
| 802 os::Bsd::set_libpthread_version("bsdthreads"); | |
| 803 } | |
| 804 | |
| 805 if (strstr(libpthread_version(), "NPTL")) { | |
| 806 os::Bsd::set_is_NPTL(); | |
| 807 } else { | |
| 808 os::Bsd::set_is_BsdThreads(); | |
| 809 } | |
| 810 | |
| 811 // BsdThreads have two flavors: floating-stack mode, which allows variable | |
| 812 // stack size; and fixed-stack mode. NPTL is always floating-stack. | |
| 813 if (os::Bsd::is_NPTL() || os::Bsd::supports_variable_stack_size()) { | |
| 814 os::Bsd::set_is_floating_stack(); | |
| 815 } | |
| 816 } | |
| 817 | |
| 818 ///////////////////////////////////////////////////////////////////////////// | |
| 819 // thread stack | |
| 820 | |
| 821 // Force Bsd kernel to expand current thread stack. If "bottom" is close | |
| 822 // to the stack guard, caller should block all signals. | |
| 823 // | |
| 824 // MAP_GROWSDOWN: | |
| 825 // A special mmap() flag that is used to implement thread stacks. It tells | |
| 826 // kernel that the memory region should extend downwards when needed. This | |
| 827 // allows early versions of BsdThreads to only mmap the first few pages | |
| 828 // when creating a new thread. Bsd kernel will automatically expand thread | |
| 829 // stack as needed (on page faults). | |
| 830 // | |
| 831 // However, because the memory region of a MAP_GROWSDOWN stack can grow on | |
| 832 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN | |
| 833 // region, it's hard to tell if the fault is due to a legitimate stack | |
| 834 // access or because of reading/writing non-exist memory (e.g. buffer | |
| 835 // overrun). As a rule, if the fault happens below current stack pointer, | |
| 836 // Bsd kernel does not expand stack, instead a SIGSEGV is sent to the | |
| 837 // application (see Bsd kernel fault.c). | |
| 838 // | |
| 839 // This Bsd feature can cause SIGSEGV when VM bangs thread stack for | |
| 840 // stack overflow detection. | |
| 841 // | |
| 842 // Newer version of BsdThreads (since glibc-2.2, or, RH-7.x) and NPTL do | |
| 843 // not use this flag. However, the stack of initial thread is not created | |
| 844 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though | |
| 845 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack | |
| 846 // and then attach the thread to JVM. | |
| 847 // | |
| 848 // To get around the problem and allow stack banging on Bsd, we need to | |
| 849 // manually expand thread stack after receiving the SIGSEGV. | |
| 850 // | |
| 851 // There are two ways to expand thread stack to address "bottom", we used | |
| 852 // both of them in JVM before 1.5: | |
| 853 // 1. adjust stack pointer first so that it is below "bottom", and then | |
| 854 // touch "bottom" | |
| 855 // 2. mmap() the page in question | |
| 856 // | |
| 857 // Now alternate signal stack is gone, it's harder to use 2. For instance, | |
| 858 // if current sp is already near the lower end of page 101, and we need to | |
| 859 // call mmap() to map page 100, it is possible that part of the mmap() frame | |
| 860 // will be placed in page 100. When page 100 is mapped, it is zero-filled. | |
| 861 // That will destroy the mmap() frame and cause VM to crash. | |
| 862 // | |
| 863 // The following code works by adjusting sp first, then accessing the "bottom" | |
| 864 // page to force a page fault. Bsd kernel will then automatically expand the | |
| 865 // stack mapping. | |
| 866 // | |
| 867 // _expand_stack_to() assumes its frame size is less than page size, which | |
| 868 // should always be true if the function is not inlined. | |
| 869 | |
| 870 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute | |
| 871 #define NOINLINE | |
| 872 #else | |
| 873 #define NOINLINE __attribute__ ((noinline)) | |
| 874 #endif | |
| 875 | |
| 876 static void _expand_stack_to(address bottom) NOINLINE; | |
| 877 | |
| 878 static void _expand_stack_to(address bottom) { | |
| 879 address sp; | |
| 880 size_t size; | |
| 881 volatile char *p; | |
| 882 | |
| 883 // Adjust bottom to point to the largest address within the same page, it | |
| 884 // gives us a one-page buffer if alloca() allocates slightly more memory. | |
| 885 bottom = (address)align_size_down((uintptr_t)bottom, os::Bsd::page_size()); | |
| 886 bottom += os::Bsd::page_size() - 1; | |
| 887 | |
| 888 // sp might be slightly above current stack pointer; if that's the case, we | |
| 889 // will alloca() a little more space than necessary, which is OK. Don't use | |
| 890 // os::current_stack_pointer(), as its result can be slightly below current | |
| 891 // stack pointer, causing us to not alloca enough to reach "bottom". | |
| 892 sp = (address)&sp; | |
| 893 | |
| 894 if (sp > bottom) { | |
| 895 size = sp - bottom; | |
| 896 p = (volatile char *)alloca(size); | |
| 897 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?"); | |
| 898 p[0] = '\0'; | |
| 899 } | |
| 900 } | |
| 901 | |
| 902 bool os::Bsd::manually_expand_stack(JavaThread * t, address addr) { | |
| 903 assert(t!=NULL, "just checking"); | |
| 904 assert(t->osthread()->expanding_stack(), "expand should be set"); | |
| 905 assert(t->stack_base() != NULL, "stack_base was not initialized"); | |
| 906 | |
| 907 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) { | |
| 908 sigset_t mask_all, old_sigset; | |
| 909 sigfillset(&mask_all); | |
| 910 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset); | |
| 911 _expand_stack_to(addr); | |
| 912 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL); | |
| 913 return true; | |
| 914 } | |
| 915 return false; | |
| 916 } | |
| 917 #endif | |
| 918 | |
| 919 ////////////////////////////////////////////////////////////////////////////// | |
| 920 // create new thread | |
| 921 | |
| 922 static address highest_vm_reserved_address(); | |
| 923 | |
| 924 // check if it's safe to start a new thread | |
| 925 static bool _thread_safety_check(Thread* thread) { | |
| 926 #ifdef _ALLBSD_SOURCE | |
| 927 return true; | |
| 928 #else | |
| 929 if (os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack()) { | |
| 930 // Fixed stack BsdThreads (SuSE Bsd/x86, and some versions of Redhat) | |
| 931 // Heap is mmap'ed at lower end of memory space. Thread stacks are | |
| 932 // allocated (MAP_FIXED) from high address space. Every thread stack | |
| 933 // occupies a fixed size slot (usually 2Mbytes, but user can change | |
| 934 // it to other values if they rebuild BsdThreads). | |
| 935 // | |
| 936 // Problem with MAP_FIXED is that mmap() can still succeed even part of | |
| 937 // the memory region has already been mmap'ed. That means if we have too | |
| 938 // many threads and/or very large heap, eventually thread stack will | |
| 939 // collide with heap. | |
| 940 // | |
| 941 // Here we try to prevent heap/stack collision by comparing current | |
| 942 // stack bottom with the highest address that has been mmap'ed by JVM | |
| 943 // plus a safety margin for memory maps created by native code. | |
| 944 // | |
| 945 // This feature can be disabled by setting ThreadSafetyMargin to 0 | |
| 946 // | |
| 947 if (ThreadSafetyMargin > 0) { | |
| 948 address stack_bottom = os::current_stack_base() - os::current_stack_size(); | |
| 949 | |
| 950 // not safe if our stack extends below the safety margin | |
| 951 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address(); | |
| 952 } else { | |
| 953 return true; | |
| 954 } | |
| 955 } else { | |
| 956 // Floating stack BsdThreads or NPTL: | |
| 957 // Unlike fixed stack BsdThreads, thread stacks are not MAP_FIXED. When | |
| 958 // there's not enough space left, pthread_create() will fail. If we come | |
| 959 // here, that means enough space has been reserved for stack. | |
| 960 return true; | |
| 961 } | |
| 962 #endif | |
| 963 } | |
| 964 | |
| 4006 | 965 #ifdef __APPLE__ |
| 966 // library handle for calling objc_registerThreadWithCollector() | |
| 967 // without static linking to the libobjc library | |
| 968 #define OBJC_LIB "/usr/lib/libobjc.dylib" | |
| 969 #define OBJC_GCREGISTER "objc_registerThreadWithCollector" | |
| 970 typedef void (*objc_registerThreadWithCollector_t)(); | |
| 971 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction; | |
| 972 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL; | |
| 973 #endif | |
| 974 | |
| 3960 | 975 // Thread start routine for all newly created threads |
| 976 static void *java_start(Thread *thread) { | |
| 977 // Try to randomize the cache line index of hot stack frames. | |
| 978 // This helps when threads of the same stack traces evict each other's | |
| 979 // cache lines. The threads can be either from the same JVM instance, or | |
| 980 // from different JVM instances. The benefit is especially true for | |
| 981 // processors with hyperthreading technology. | |
| 982 static int counter = 0; | |
| 983 int pid = os::current_process_id(); | |
| 984 alloca(((pid ^ counter++) & 7) * 128); | |
| 985 | |
| 986 ThreadLocalStorage::set_thread(thread); | |
| 987 | |
| 988 OSThread* osthread = thread->osthread(); | |
| 989 Monitor* sync = osthread->startThread_lock(); | |
| 990 | |
| 991 // non floating stack BsdThreads needs extra check, see above | |
| 992 if (!_thread_safety_check(thread)) { | |
| 993 // notify parent thread | |
| 994 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 995 osthread->set_state(ZOMBIE); | |
| 996 sync->notify_all(); | |
| 997 return NULL; | |
| 998 } | |
| 999 | |
| 1000 #ifdef _ALLBSD_SOURCE | |
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1001 #ifdef __APPLE__ |
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1002 // thread_id is mach thread on macos |
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1003 osthread->set_thread_id(::mach_thread_self()); |
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1004 #else |
| 3960 | 1005 // thread_id is pthread_id on BSD |
| 1006 osthread->set_thread_id(::pthread_self()); | |
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1007 #endif |
| 3960 | 1008 #else |
| 1009 // thread_id is kernel thread id (similar to Solaris LWP id) | |
| 1010 osthread->set_thread_id(os::Bsd::gettid()); | |
| 1011 | |
| 1012 if (UseNUMA) { | |
| 1013 int lgrp_id = os::numa_get_group_id(); | |
| 1014 if (lgrp_id != -1) { | |
| 1015 thread->set_lgrp_id(lgrp_id); | |
| 1016 } | |
| 1017 } | |
| 1018 #endif | |
| 1019 // initialize signal mask for this thread | |
| 1020 os::Bsd::hotspot_sigmask(thread); | |
| 1021 | |
| 1022 // initialize floating point control register | |
| 1023 os::Bsd::init_thread_fpu_state(); | |
| 1024 | |
| 4006 | 1025 #ifdef __APPLE__ |
| 1026 // register thread with objc gc | |
| 1027 if (objc_registerThreadWithCollectorFunction != NULL) { | |
| 1028 objc_registerThreadWithCollectorFunction(); | |
| 1029 } | |
| 1030 #endif | |
| 1031 | |
| 3960 | 1032 // handshaking with parent thread |
| 1033 { | |
| 1034 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); | |
| 1035 | |
| 1036 // notify parent thread | |
| 1037 osthread->set_state(INITIALIZED); | |
| 1038 sync->notify_all(); | |
| 1039 | |
| 1040 // wait until os::start_thread() | |
| 1041 while (osthread->get_state() == INITIALIZED) { | |
| 1042 sync->wait(Mutex::_no_safepoint_check_flag); | |
| 1043 } | |
| 1044 } | |
| 1045 | |
| 1046 // call one more level start routine | |
| 1047 thread->run(); | |
| 1048 | |
| 1049 return 0; | |
| 1050 } | |
| 1051 | |
| 1052 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { | |
| 1053 assert(thread->osthread() == NULL, "caller responsible"); | |
| 1054 | |
| 1055 // Allocate the OSThread object | |
| 1056 OSThread* osthread = new OSThread(NULL, NULL); | |
| 1057 if (osthread == NULL) { | |
| 1058 return false; | |
| 1059 } | |
| 1060 | |
| 1061 // set the correct thread state | |
| 1062 osthread->set_thread_type(thr_type); | |
| 1063 | |
| 1064 // Initial state is ALLOCATED but not INITIALIZED | |
| 1065 osthread->set_state(ALLOCATED); | |
| 1066 | |
| 1067 thread->set_osthread(osthread); | |
| 1068 | |
| 1069 // init thread attributes | |
| 1070 pthread_attr_t attr; | |
| 1071 pthread_attr_init(&attr); | |
| 1072 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
| 1073 | |
| 1074 // stack size | |
| 1075 if (os::Bsd::supports_variable_stack_size()) { | |
| 1076 // calculate stack size if it's not specified by caller | |
| 1077 if (stack_size == 0) { | |
| 1078 stack_size = os::Bsd::default_stack_size(thr_type); | |
| 1079 | |
| 1080 switch (thr_type) { | |
| 1081 case os::java_thread: | |
| 1082 // Java threads use ThreadStackSize which default value can be | |
| 1083 // changed with the flag -Xss | |
| 1084 assert (JavaThread::stack_size_at_create() > 0, "this should be set"); | |
| 1085 stack_size = JavaThread::stack_size_at_create(); | |
| 1086 break; | |
| 1087 case os::compiler_thread: | |
| 1088 if (CompilerThreadStackSize > 0) { | |
| 1089 stack_size = (size_t)(CompilerThreadStackSize * K); | |
| 1090 break; | |
| 1091 } // else fall through: | |
| 1092 // use VMThreadStackSize if CompilerThreadStackSize is not defined | |
| 1093 case os::vm_thread: | |
| 1094 case os::pgc_thread: | |
| 1095 case os::cgc_thread: | |
| 1096 case os::watcher_thread: | |
| 1097 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); | |
| 1098 break; | |
| 1099 } | |
| 1100 } | |
| 1101 | |
| 1102 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed); | |
| 1103 pthread_attr_setstacksize(&attr, stack_size); | |
| 1104 } else { | |
| 1105 // let pthread_create() pick the default value. | |
| 1106 } | |
| 1107 | |
| 1108 #ifndef _ALLBSD_SOURCE | |
| 1109 // glibc guard page | |
| 1110 pthread_attr_setguardsize(&attr, os::Bsd::default_guard_size(thr_type)); | |
| 1111 #endif | |
| 1112 | |
| 1113 ThreadState state; | |
| 1114 | |
| 1115 { | |
| 1116 | |
| 1117 #ifndef _ALLBSD_SOURCE | |
| 1118 // Serialize thread creation if we are running with fixed stack BsdThreads | |
| 1119 bool lock = os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack(); | |
| 1120 if (lock) { | |
| 1121 os::Bsd::createThread_lock()->lock_without_safepoint_check(); | |
| 1122 } | |
| 1123 #endif | |
| 1124 | |
| 1125 pthread_t tid; | |
| 1126 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread); | |
| 1127 | |
| 1128 pthread_attr_destroy(&attr); | |
| 1129 | |
| 1130 if (ret != 0) { | |
| 1131 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 1132 perror("pthread_create()"); | |
| 1133 } | |
| 1134 // Need to clean up stuff we've allocated so far | |
| 1135 thread->set_osthread(NULL); | |
| 1136 delete osthread; | |
| 1137 #ifndef _ALLBSD_SOURCE | |
| 1138 if (lock) os::Bsd::createThread_lock()->unlock(); | |
| 1139 #endif | |
| 1140 return false; | |
| 1141 } | |
| 1142 | |
| 1143 // Store pthread info into the OSThread | |
| 1144 osthread->set_pthread_id(tid); | |
| 1145 | |
| 1146 // Wait until child thread is either initialized or aborted | |
| 1147 { | |
| 1148 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 1149 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 1150 while ((state = osthread->get_state()) == ALLOCATED) { | |
| 1151 sync_with_child->wait(Mutex::_no_safepoint_check_flag); | |
| 1152 } | |
| 1153 } | |
| 1154 | |
| 1155 #ifndef _ALLBSD_SOURCE | |
| 1156 if (lock) { | |
| 1157 os::Bsd::createThread_lock()->unlock(); | |
| 1158 } | |
| 1159 #endif | |
| 1160 } | |
| 1161 | |
| 1162 // Aborted due to thread limit being reached | |
| 1163 if (state == ZOMBIE) { | |
| 1164 thread->set_osthread(NULL); | |
| 1165 delete osthread; | |
| 1166 return false; | |
| 1167 } | |
| 1168 | |
| 1169 // The thread is returned suspended (in state INITIALIZED), | |
| 1170 // and is started higher up in the call chain | |
| 1171 assert(state == INITIALIZED, "race condition"); | |
| 1172 return true; | |
| 1173 } | |
| 1174 | |
| 1175 ///////////////////////////////////////////////////////////////////////////// | |
| 1176 // attach existing thread | |
| 1177 | |
| 1178 // bootstrap the main thread | |
| 1179 bool os::create_main_thread(JavaThread* thread) { | |
| 1180 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread"); | |
| 1181 return create_attached_thread(thread); | |
| 1182 } | |
| 1183 | |
| 1184 bool os::create_attached_thread(JavaThread* thread) { | |
| 1185 #ifdef ASSERT | |
| 1186 thread->verify_not_published(); | |
| 1187 #endif | |
| 1188 | |
| 1189 // Allocate the OSThread object | |
| 1190 OSThread* osthread = new OSThread(NULL, NULL); | |
| 1191 | |
| 1192 if (osthread == NULL) { | |
| 1193 return false; | |
| 1194 } | |
| 1195 | |
| 1196 // Store pthread info into the OSThread | |
| 1197 #ifdef _ALLBSD_SOURCE | |
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1198 #ifdef __APPLE__ |
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1199 osthread->set_thread_id(::mach_thread_self()); |
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1200 #else |
| 3960 | 1201 osthread->set_thread_id(::pthread_self()); |
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1202 #endif |
| 3960 | 1203 #else |
| 1204 osthread->set_thread_id(os::Bsd::gettid()); | |
| 1205 #endif | |
| 1206 osthread->set_pthread_id(::pthread_self()); | |
| 1207 | |
| 1208 // initialize floating point control register | |
| 1209 os::Bsd::init_thread_fpu_state(); | |
| 1210 | |
| 1211 // Initial thread state is RUNNABLE | |
| 1212 osthread->set_state(RUNNABLE); | |
| 1213 | |
| 1214 thread->set_osthread(osthread); | |
| 1215 | |
| 1216 #ifndef _ALLBSD_SOURCE | |
| 1217 if (UseNUMA) { | |
| 1218 int lgrp_id = os::numa_get_group_id(); | |
| 1219 if (lgrp_id != -1) { | |
| 1220 thread->set_lgrp_id(lgrp_id); | |
| 1221 } | |
| 1222 } | |
| 1223 | |
| 1224 if (os::Bsd::is_initial_thread()) { | |
| 1225 // If current thread is initial thread, its stack is mapped on demand, | |
| 1226 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map | |
| 1227 // the entire stack region to avoid SEGV in stack banging. | |
| 1228 // It is also useful to get around the heap-stack-gap problem on SuSE | |
| 1229 // kernel (see 4821821 for details). We first expand stack to the top | |
| 1230 // of yellow zone, then enable stack yellow zone (order is significant, | |
| 1231 // enabling yellow zone first will crash JVM on SuSE Bsd), so there | |
| 1232 // is no gap between the last two virtual memory regions. | |
| 1233 | |
| 1234 JavaThread *jt = (JavaThread *)thread; | |
| 1235 address addr = jt->stack_yellow_zone_base(); | |
| 1236 assert(addr != NULL, "initialization problem?"); | |
| 1237 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled"); | |
| 1238 | |
| 1239 osthread->set_expanding_stack(); | |
| 1240 os::Bsd::manually_expand_stack(jt, addr); | |
| 1241 osthread->clear_expanding_stack(); | |
| 1242 } | |
| 1243 #endif | |
| 1244 | |
| 1245 // initialize signal mask for this thread | |
| 1246 // and save the caller's signal mask | |
| 1247 os::Bsd::hotspot_sigmask(thread); | |
| 1248 | |
| 1249 return true; | |
| 1250 } | |
| 1251 | |
| 1252 void os::pd_start_thread(Thread* thread) { | |
| 1253 OSThread * osthread = thread->osthread(); | |
| 1254 assert(osthread->get_state() != INITIALIZED, "just checking"); | |
| 1255 Monitor* sync_with_child = osthread->startThread_lock(); | |
| 1256 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag); | |
| 1257 sync_with_child->notify(); | |
| 1258 } | |
| 1259 | |
| 1260 // Free Bsd resources related to the OSThread | |
| 1261 void os::free_thread(OSThread* osthread) { | |
| 1262 assert(osthread != NULL, "osthread not set"); | |
| 1263 | |
| 1264 if (Thread::current()->osthread() == osthread) { | |
| 1265 // Restore caller's signal mask | |
| 1266 sigset_t sigmask = osthread->caller_sigmask(); | |
| 1267 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); | |
| 1268 } | |
| 1269 | |
| 1270 delete osthread; | |
| 1271 } | |
| 1272 | |
| 1273 ////////////////////////////////////////////////////////////////////////////// | |
| 1274 // thread local storage | |
| 1275 | |
| 1276 int os::allocate_thread_local_storage() { | |
| 1277 pthread_key_t key; | |
| 1278 int rslt = pthread_key_create(&key, NULL); | |
| 1279 assert(rslt == 0, "cannot allocate thread local storage"); | |
| 1280 return (int)key; | |
| 1281 } | |
| 1282 | |
| 1283 // Note: This is currently not used by VM, as we don't destroy TLS key | |
| 1284 // on VM exit. | |
| 1285 void os::free_thread_local_storage(int index) { | |
| 1286 int rslt = pthread_key_delete((pthread_key_t)index); | |
| 1287 assert(rslt == 0, "invalid index"); | |
| 1288 } | |
| 1289 | |
| 1290 void os::thread_local_storage_at_put(int index, void* value) { | |
| 1291 int rslt = pthread_setspecific((pthread_key_t)index, value); | |
| 1292 assert(rslt == 0, "pthread_setspecific failed"); | |
| 1293 } | |
| 1294 | |
| 1295 extern "C" Thread* get_thread() { | |
| 1296 return ThreadLocalStorage::thread(); | |
| 1297 } | |
| 1298 | |
| 1299 ////////////////////////////////////////////////////////////////////////////// | |
| 1300 // initial thread | |
| 1301 | |
| 1302 #ifndef _ALLBSD_SOURCE | |
| 1303 // Check if current thread is the initial thread, similar to Solaris thr_main. | |
| 1304 bool os::Bsd::is_initial_thread(void) { | |
| 1305 char dummy; | |
| 1306 // If called before init complete, thread stack bottom will be null. | |
| 1307 // Can be called if fatal error occurs before initialization. | |
| 1308 if (initial_thread_stack_bottom() == NULL) return false; | |
| 1309 assert(initial_thread_stack_bottom() != NULL && | |
| 1310 initial_thread_stack_size() != 0, | |
| 1311 "os::init did not locate initial thread's stack region"); | |
| 1312 if ((address)&dummy >= initial_thread_stack_bottom() && | |
| 1313 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size()) | |
| 1314 return true; | |
| 1315 else return false; | |
| 1316 } | |
| 1317 | |
| 1318 // Find the virtual memory area that contains addr | |
| 1319 static bool find_vma(address addr, address* vma_low, address* vma_high) { | |
| 1320 FILE *fp = fopen("/proc/self/maps", "r"); | |
| 1321 if (fp) { | |
| 1322 address low, high; | |
| 1323 while (!feof(fp)) { | |
| 1324 if (fscanf(fp, "%p-%p", &low, &high) == 2) { | |
| 1325 if (low <= addr && addr < high) { | |
| 1326 if (vma_low) *vma_low = low; | |
| 1327 if (vma_high) *vma_high = high; | |
| 1328 fclose (fp); | |
| 1329 return true; | |
| 1330 } | |
| 1331 } | |
| 1332 for (;;) { | |
| 1333 int ch = fgetc(fp); | |
| 1334 if (ch == EOF || ch == (int)'\n') break; | |
| 1335 } | |
| 1336 } | |
| 1337 fclose(fp); | |
| 1338 } | |
| 1339 return false; | |
| 1340 } | |
| 1341 | |
| 1342 // Locate initial thread stack. This special handling of initial thread stack | |
| 1343 // is needed because pthread_getattr_np() on most (all?) Bsd distros returns | |
| 1344 // bogus value for initial thread. | |
| 1345 void os::Bsd::capture_initial_stack(size_t max_size) { | |
| 1346 // stack size is the easy part, get it from RLIMIT_STACK | |
| 1347 size_t stack_size; | |
| 1348 struct rlimit rlim; | |
| 1349 getrlimit(RLIMIT_STACK, &rlim); | |
| 1350 stack_size = rlim.rlim_cur; | |
| 1351 | |
| 1352 // 6308388: a bug in ld.so will relocate its own .data section to the | |
| 1353 // lower end of primordial stack; reduce ulimit -s value a little bit | |
| 1354 // so we won't install guard page on ld.so's data section. | |
| 1355 stack_size -= 2 * page_size(); | |
| 1356 | |
| 1357 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat | |
| 1358 // 7.1, in both cases we will get 2G in return value. | |
| 1359 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0, | |
| 1360 // SuSE 7.2, Debian) can not handle alternate signal stack correctly | |
| 1361 // for initial thread if its stack size exceeds 6M. Cap it at 2M, | |
| 1362 // in case other parts in glibc still assumes 2M max stack size. | |
| 1363 // FIXME: alt signal stack is gone, maybe we can relax this constraint? | |
| 1364 #ifndef IA64 | |
| 1365 if (stack_size > 2 * K * K) stack_size = 2 * K * K; | |
| 1366 #else | |
| 1367 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small | |
| 1368 if (stack_size > 4 * K * K) stack_size = 4 * K * K; | |
| 1369 #endif | |
| 1370 | |
| 1371 // Try to figure out where the stack base (top) is. This is harder. | |
| 1372 // | |
| 1373 // When an application is started, glibc saves the initial stack pointer in | |
| 1374 // a global variable "__libc_stack_end", which is then used by system | |
| 1375 // libraries. __libc_stack_end should be pretty close to stack top. The | |
| 1376 // variable is available since the very early days. However, because it is | |
| 1377 // a private interface, it could disappear in the future. | |
| 1378 // | |
| 1379 // Bsd kernel saves start_stack information in /proc/<pid>/stat. Similar | |
| 1380 // to __libc_stack_end, it is very close to stack top, but isn't the real | |
| 1381 // stack top. Note that /proc may not exist if VM is running as a chroot | |
| 1382 // program, so reading /proc/<pid>/stat could fail. Also the contents of | |
| 1383 // /proc/<pid>/stat could change in the future (though unlikely). | |
| 1384 // | |
| 1385 // We try __libc_stack_end first. If that doesn't work, look for | |
| 1386 // /proc/<pid>/stat. If neither of them works, we use current stack pointer | |
| 1387 // as a hint, which should work well in most cases. | |
| 1388 | |
| 1389 uintptr_t stack_start; | |
| 1390 | |
| 1391 // try __libc_stack_end first | |
| 1392 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end"); | |
| 1393 if (p && *p) { | |
| 1394 stack_start = *p; | |
| 1395 } else { | |
| 1396 // see if we can get the start_stack field from /proc/self/stat | |
| 1397 FILE *fp; | |
| 1398 int pid; | |
| 1399 char state; | |
| 1400 int ppid; | |
| 1401 int pgrp; | |
| 1402 int session; | |
| 1403 int nr; | |
| 1404 int tpgrp; | |
| 1405 unsigned long flags; | |
| 1406 unsigned long minflt; | |
| 1407 unsigned long cminflt; | |
| 1408 unsigned long majflt; | |
| 1409 unsigned long cmajflt; | |
| 1410 unsigned long utime; | |
| 1411 unsigned long stime; | |
| 1412 long cutime; | |
| 1413 long cstime; | |
| 1414 long prio; | |
| 1415 long nice; | |
| 1416 long junk; | |
| 1417 long it_real; | |
| 1418 uintptr_t start; | |
| 1419 uintptr_t vsize; | |
| 1420 intptr_t rss; | |
| 1421 uintptr_t rsslim; | |
| 1422 uintptr_t scodes; | |
| 1423 uintptr_t ecode; | |
| 1424 int i; | |
| 1425 | |
| 1426 // Figure what the primordial thread stack base is. Code is inspired | |
| 1427 // by email from Hans Boehm. /proc/self/stat begins with current pid, | |
| 1428 // followed by command name surrounded by parentheses, state, etc. | |
| 1429 char stat[2048]; | |
| 1430 int statlen; | |
| 1431 | |
| 1432 fp = fopen("/proc/self/stat", "r"); | |
| 1433 if (fp) { | |
| 1434 statlen = fread(stat, 1, 2047, fp); | |
| 1435 stat[statlen] = '\0'; | |
| 1436 fclose(fp); | |
| 1437 | |
| 1438 // Skip pid and the command string. Note that we could be dealing with | |
| 1439 // weird command names, e.g. user could decide to rename java launcher | |
| 1440 // to "java 1.4.2 :)", then the stat file would look like | |
| 1441 // 1234 (java 1.4.2 :)) R ... ... | |
| 1442 // We don't really need to know the command string, just find the last | |
| 1443 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
| 1444 char * s = strrchr(stat, ')'); | |
| 1445 | |
| 1446 i = 0; | |
| 1447 if (s) { | |
| 1448 // Skip blank chars | |
| 1449 do s++; while (isspace(*s)); | |
| 1450 | |
| 1451 #define _UFM UINTX_FORMAT | |
| 1452 #define _DFM INTX_FORMAT | |
| 1453 | |
| 1454 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */ | |
| 1455 /* 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 */ | |
| 1456 i = sscanf(s, "%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld " _UFM _UFM _DFM _UFM _UFM _UFM _UFM, | |
| 1457 &state, /* 3 %c */ | |
| 1458 &ppid, /* 4 %d */ | |
| 1459 &pgrp, /* 5 %d */ | |
| 1460 &session, /* 6 %d */ | |
| 1461 &nr, /* 7 %d */ | |
| 1462 &tpgrp, /* 8 %d */ | |
| 1463 &flags, /* 9 %lu */ | |
| 1464 &minflt, /* 10 %lu */ | |
| 1465 &cminflt, /* 11 %lu */ | |
| 1466 &majflt, /* 12 %lu */ | |
| 1467 &cmajflt, /* 13 %lu */ | |
| 1468 &utime, /* 14 %lu */ | |
| 1469 &stime, /* 15 %lu */ | |
| 1470 &cutime, /* 16 %ld */ | |
| 1471 &cstime, /* 17 %ld */ | |
| 1472 &prio, /* 18 %ld */ | |
| 1473 &nice, /* 19 %ld */ | |
| 1474 &junk, /* 20 %ld */ | |
| 1475 &it_real, /* 21 %ld */ | |
| 1476 &start, /* 22 UINTX_FORMAT */ | |
| 1477 &vsize, /* 23 UINTX_FORMAT */ | |
| 1478 &rss, /* 24 INTX_FORMAT */ | |
| 1479 &rsslim, /* 25 UINTX_FORMAT */ | |
| 1480 &scodes, /* 26 UINTX_FORMAT */ | |
| 1481 &ecode, /* 27 UINTX_FORMAT */ | |
| 1482 &stack_start); /* 28 UINTX_FORMAT */ | |
| 1483 } | |
| 1484 | |
| 1485 #undef _UFM | |
| 1486 #undef _DFM | |
| 1487 | |
| 1488 if (i != 28 - 2) { | |
| 1489 assert(false, "Bad conversion from /proc/self/stat"); | |
| 1490 // product mode - assume we are the initial thread, good luck in the | |
| 1491 // embedded case. | |
| 1492 warning("Can't detect initial thread stack location - bad conversion"); | |
| 1493 stack_start = (uintptr_t) &rlim; | |
| 1494 } | |
| 1495 } else { | |
| 1496 // For some reason we can't open /proc/self/stat (for example, running on | |
| 1497 // FreeBSD with a Bsd emulator, or inside chroot), this should work for | |
| 1498 // most cases, so don't abort: | |
| 1499 warning("Can't detect initial thread stack location - no /proc/self/stat"); | |
| 1500 stack_start = (uintptr_t) &rlim; | |
| 1501 } | |
| 1502 } | |
| 1503 | |
| 1504 // Now we have a pointer (stack_start) very close to the stack top, the | |
| 1505 // next thing to do is to figure out the exact location of stack top. We | |
| 1506 // can find out the virtual memory area that contains stack_start by | |
| 1507 // reading /proc/self/maps, it should be the last vma in /proc/self/maps, | |
| 1508 // and its upper limit is the real stack top. (again, this would fail if | |
| 1509 // running inside chroot, because /proc may not exist.) | |
| 1510 | |
| 1511 uintptr_t stack_top; | |
| 1512 address low, high; | |
| 1513 if (find_vma((address)stack_start, &low, &high)) { | |
| 1514 // success, "high" is the true stack top. (ignore "low", because initial | |
| 1515 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.) | |
| 1516 stack_top = (uintptr_t)high; | |
| 1517 } else { | |
| 1518 // failed, likely because /proc/self/maps does not exist | |
| 1519 warning("Can't detect initial thread stack location - find_vma failed"); | |
| 1520 // best effort: stack_start is normally within a few pages below the real | |
| 1521 // stack top, use it as stack top, and reduce stack size so we won't put | |
| 1522 // guard page outside stack. | |
| 1523 stack_top = stack_start; | |
| 1524 stack_size -= 16 * page_size(); | |
| 1525 } | |
| 1526 | |
| 1527 // stack_top could be partially down the page so align it | |
| 1528 stack_top = align_size_up(stack_top, page_size()); | |
| 1529 | |
| 1530 if (max_size && stack_size > max_size) { | |
| 1531 _initial_thread_stack_size = max_size; | |
| 1532 } else { | |
| 1533 _initial_thread_stack_size = stack_size; | |
| 1534 } | |
| 1535 | |
| 1536 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size()); | |
| 1537 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size; | |
| 1538 } | |
| 1539 #endif | |
| 1540 | |
| 1541 //////////////////////////////////////////////////////////////////////////////// | |
| 1542 // time support | |
| 1543 | |
| 1544 // Time since start-up in seconds to a fine granularity. | |
| 1545 // Used by VMSelfDestructTimer and the MemProfiler. | |
| 1546 double os::elapsedTime() { | |
| 1547 | |
| 1548 return (double)(os::elapsed_counter()) * 0.000001; | |
| 1549 } | |
| 1550 | |
| 1551 jlong os::elapsed_counter() { | |
| 1552 timeval time; | |
| 1553 int status = gettimeofday(&time, NULL); | |
| 1554 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; | |
| 1555 } | |
| 1556 | |
| 1557 jlong os::elapsed_frequency() { | |
| 1558 return (1000 * 1000); | |
| 1559 } | |
| 1560 | |
| 1561 // XXX: For now, code this as if BSD does not support vtime. | |
| 1562 bool os::supports_vtime() { return false; } | |
| 1563 bool os::enable_vtime() { return false; } | |
| 1564 bool os::vtime_enabled() { return false; } | |
| 1565 double os::elapsedVTime() { | |
| 1566 // better than nothing, but not much | |
| 1567 return elapsedTime(); | |
| 1568 } | |
| 1569 | |
| 1570 jlong os::javaTimeMillis() { | |
| 1571 timeval time; | |
| 1572 int status = gettimeofday(&time, NULL); | |
| 1573 assert(status != -1, "bsd error"); | |
| 1574 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); | |
| 1575 } | |
| 1576 | |
| 1577 #ifndef CLOCK_MONOTONIC | |
| 1578 #define CLOCK_MONOTONIC (1) | |
| 1579 #endif | |
| 1580 | |
| 1581 #ifdef __APPLE__ | |
| 1582 void os::Bsd::clock_init() { | |
| 1583 // XXXDARWIN: Investigate replacement monotonic clock | |
| 1584 } | |
| 1585 #elif defined(_ALLBSD_SOURCE) | |
| 1586 void os::Bsd::clock_init() { | |
| 1587 struct timespec res; | |
| 1588 struct timespec tp; | |
| 1589 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 && | |
| 1590 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) { | |
| 1591 // yes, monotonic clock is supported | |
| 1592 _clock_gettime = ::clock_gettime; | |
| 1593 } | |
| 1594 } | |
| 1595 #else | |
| 1596 void os::Bsd::clock_init() { | |
| 1597 // we do dlopen's in this particular order due to bug in bsd | |
| 1598 // dynamical loader (see 6348968) leading to crash on exit | |
| 1599 void* handle = dlopen("librt.so.1", RTLD_LAZY); | |
| 1600 if (handle == NULL) { | |
| 1601 handle = dlopen("librt.so", RTLD_LAZY); | |
| 1602 } | |
| 1603 | |
| 1604 if (handle) { | |
| 1605 int (*clock_getres_func)(clockid_t, struct timespec*) = | |
| 1606 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres"); | |
| 1607 int (*clock_gettime_func)(clockid_t, struct timespec*) = | |
| 1608 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime"); | |
| 1609 if (clock_getres_func && clock_gettime_func) { | |
| 1610 // See if monotonic clock is supported by the kernel. Note that some | |
| 1611 // early implementations simply return kernel jiffies (updated every | |
| 1612 // 1/100 or 1/1000 second). It would be bad to use such a low res clock | |
| 1613 // for nano time (though the monotonic property is still nice to have). | |
| 1614 // It's fixed in newer kernels, however clock_getres() still returns | |
| 1615 // 1/HZ. We check if clock_getres() works, but will ignore its reported | |
| 1616 // resolution for now. Hopefully as people move to new kernels, this | |
| 1617 // won't be a problem. | |
| 1618 struct timespec res; | |
| 1619 struct timespec tp; | |
| 1620 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 && | |
| 1621 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) { | |
| 1622 // yes, monotonic clock is supported | |
| 1623 _clock_gettime = clock_gettime_func; | |
| 1624 } else { | |
| 1625 // close librt if there is no monotonic clock | |
| 1626 dlclose(handle); | |
| 1627 } | |
| 1628 } | |
| 1629 } | |
| 1630 } | |
| 1631 #endif | |
| 1632 | |
| 1633 #ifndef _ALLBSD_SOURCE | |
| 1634 #ifndef SYS_clock_getres | |
| 1635 | |
| 1636 #if defined(IA32) || defined(AMD64) | |
| 1637 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229) | |
| 1638 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) | |
| 1639 #else | |
| 1640 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time" | |
| 1641 #define sys_clock_getres(x,y) -1 | |
| 1642 #endif | |
| 1643 | |
| 1644 #else | |
| 1645 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y) | |
| 1646 #endif | |
| 1647 | |
| 1648 void os::Bsd::fast_thread_clock_init() { | |
| 1649 if (!UseBsdPosixThreadCPUClocks) { | |
| 1650 return; | |
| 1651 } | |
| 1652 clockid_t clockid; | |
| 1653 struct timespec tp; | |
| 1654 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) = | |
| 1655 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid"); | |
| 1656 | |
| 1657 // Switch to using fast clocks for thread cpu time if | |
| 1658 // the sys_clock_getres() returns 0 error code. | |
| 1659 // Note, that some kernels may support the current thread | |
| 1660 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks | |
| 1661 // returned by the pthread_getcpuclockid(). | |
| 1662 // If the fast Posix clocks are supported then the sys_clock_getres() | |
| 1663 // must return at least tp.tv_sec == 0 which means a resolution | |
| 1664 // better than 1 sec. This is extra check for reliability. | |
| 1665 | |
| 1666 if(pthread_getcpuclockid_func && | |
| 1667 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 && | |
| 1668 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) { | |
| 1669 | |
| 1670 _supports_fast_thread_cpu_time = true; | |
| 1671 _pthread_getcpuclockid = pthread_getcpuclockid_func; | |
| 1672 } | |
| 1673 } | |
| 1674 #endif | |
| 1675 | |
| 1676 jlong os::javaTimeNanos() { | |
| 1677 if (Bsd::supports_monotonic_clock()) { | |
| 1678 struct timespec tp; | |
| 1679 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp); | |
| 1680 assert(status == 0, "gettime error"); | |
| 1681 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec); | |
| 1682 return result; | |
| 1683 } else { | |
| 1684 timeval time; | |
| 1685 int status = gettimeofday(&time, NULL); | |
| 1686 assert(status != -1, "bsd error"); | |
| 1687 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec); | |
| 1688 return 1000 * usecs; | |
| 1689 } | |
| 1690 } | |
| 1691 | |
| 1692 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { | |
| 1693 if (Bsd::supports_monotonic_clock()) { | |
| 1694 info_ptr->max_value = ALL_64_BITS; | |
| 1695 | |
| 1696 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past | |
| 1697 info_ptr->may_skip_backward = false; // not subject to resetting or drifting | |
| 1698 info_ptr->may_skip_forward = false; // not subject to resetting or drifting | |
| 1699 } else { | |
| 1700 // gettimeofday - based on time in seconds since the Epoch thus does not wrap | |
| 1701 info_ptr->max_value = ALL_64_BITS; | |
| 1702 | |
| 1703 // gettimeofday is a real time clock so it skips | |
| 1704 info_ptr->may_skip_backward = true; | |
| 1705 info_ptr->may_skip_forward = true; | |
| 1706 } | |
| 1707 | |
| 1708 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time | |
| 1709 } | |
| 1710 | |
| 1711 // Return the real, user, and system times in seconds from an | |
| 1712 // arbitrary fixed point in the past. | |
| 1713 bool os::getTimesSecs(double* process_real_time, | |
| 1714 double* process_user_time, | |
| 1715 double* process_system_time) { | |
| 1716 struct tms ticks; | |
| 1717 clock_t real_ticks = times(&ticks); | |
| 1718 | |
| 1719 if (real_ticks == (clock_t) (-1)) { | |
| 1720 return false; | |
| 1721 } else { | |
| 1722 double ticks_per_second = (double) clock_tics_per_sec; | |
| 1723 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; | |
| 1724 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; | |
| 1725 *process_real_time = ((double) real_ticks) / ticks_per_second; | |
| 1726 | |
| 1727 return true; | |
| 1728 } | |
| 1729 } | |
| 1730 | |
| 1731 | |
| 1732 char * os::local_time_string(char *buf, size_t buflen) { | |
| 1733 struct tm t; | |
| 1734 time_t long_time; | |
| 1735 time(&long_time); | |
| 1736 localtime_r(&long_time, &t); | |
| 1737 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", | |
| 1738 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, | |
| 1739 t.tm_hour, t.tm_min, t.tm_sec); | |
| 1740 return buf; | |
| 1741 } | |
| 1742 | |
| 1743 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { | |
| 1744 return localtime_r(clock, res); | |
| 1745 } | |
| 1746 | |
| 1747 //////////////////////////////////////////////////////////////////////////////// | |
| 1748 // runtime exit support | |
| 1749 | |
| 1750 // Note: os::shutdown() might be called very early during initialization, or | |
| 1751 // called from signal handler. Before adding something to os::shutdown(), make | |
| 1752 // sure it is async-safe and can handle partially initialized VM. | |
| 1753 void os::shutdown() { | |
| 1754 | |
| 1755 // allow PerfMemory to attempt cleanup of any persistent resources | |
| 1756 perfMemory_exit(); | |
| 1757 | |
| 1758 // needs to remove object in file system | |
| 1759 AttachListener::abort(); | |
| 1760 | |
| 1761 // flush buffered output, finish log files | |
| 1762 ostream_abort(); | |
| 1763 | |
| 1764 // Check for abort hook | |
| 1765 abort_hook_t abort_hook = Arguments::abort_hook(); | |
| 1766 if (abort_hook != NULL) { | |
| 1767 abort_hook(); | |
| 1768 } | |
| 1769 | |
| 1770 } | |
| 1771 | |
| 1772 // Note: os::abort() might be called very early during initialization, or | |
| 1773 // called from signal handler. Before adding something to os::abort(), make | |
| 1774 // sure it is async-safe and can handle partially initialized VM. | |
| 1775 void os::abort(bool dump_core) { | |
| 1776 os::shutdown(); | |
| 1777 if (dump_core) { | |
| 1778 #ifndef PRODUCT | |
| 1779 fdStream out(defaultStream::output_fd()); | |
| 1780 out.print_raw("Current thread is "); | |
| 1781 char buf[16]; | |
| 1782 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); | |
| 1783 out.print_raw_cr(buf); | |
| 1784 out.print_raw_cr("Dumping core ..."); | |
| 1785 #endif | |
| 1786 ::abort(); // dump core | |
| 1787 } | |
| 1788 | |
| 1789 ::exit(1); | |
| 1790 } | |
| 1791 | |
| 1792 // Die immediately, no exit hook, no abort hook, no cleanup. | |
| 1793 void os::die() { | |
| 1794 // _exit() on BsdThreads only kills current thread | |
| 1795 ::abort(); | |
| 1796 } | |
| 1797 | |
| 1798 // unused on bsd for now. | |
| 1799 void os::set_error_file(const char *logfile) {} | |
| 1800 | |
| 1801 | |
| 1802 // This method is a copy of JDK's sysGetLastErrorString | |
| 1803 // from src/solaris/hpi/src/system_md.c | |
| 1804 | |
| 1805 size_t os::lasterror(char *buf, size_t len) { | |
| 1806 | |
| 1807 if (errno == 0) return 0; | |
| 1808 | |
| 1809 const char *s = ::strerror(errno); | |
| 1810 size_t n = ::strlen(s); | |
| 1811 if (n >= len) { | |
| 1812 n = len - 1; | |
| 1813 } | |
| 1814 ::strncpy(buf, s, n); | |
| 1815 buf[n] = '\0'; | |
| 1816 return n; | |
| 1817 } | |
| 1818 | |
|
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1819 intx os::current_thread_id() { |
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1820 #ifdef __APPLE__ |
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1821 return (intx)::mach_thread_self(); |
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1822 #else |
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1823 return (intx)::pthread_self(); |
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1824 #endif |
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1825 } |
| 3960 | 1826 int os::current_process_id() { |
| 1827 | |
| 1828 // Under the old bsd thread library, bsd gives each thread | |
| 1829 // its own process id. Because of this each thread will return | |
| 1830 // a different pid if this method were to return the result | |
| 1831 // of getpid(2). Bsd provides no api that returns the pid | |
| 1832 // of the launcher thread for the vm. This implementation | |
| 1833 // returns a unique pid, the pid of the launcher thread | |
| 1834 // that starts the vm 'process'. | |
| 1835 | |
| 1836 // Under the NPTL, getpid() returns the same pid as the | |
| 1837 // launcher thread rather than a unique pid per thread. | |
| 1838 // Use gettid() if you want the old pre NPTL behaviour. | |
| 1839 | |
| 1840 // if you are looking for the result of a call to getpid() that | |
| 1841 // returns a unique pid for the calling thread, then look at the | |
| 1842 // OSThread::thread_id() method in osThread_bsd.hpp file | |
| 1843 | |
| 1844 return (int)(_initial_pid ? _initial_pid : getpid()); | |
| 1845 } | |
| 1846 | |
| 1847 // DLL functions | |
| 1848 | |
| 1849 #define JNI_LIB_PREFIX "lib" | |
| 1850 #ifdef __APPLE__ | |
| 1851 #define JNI_LIB_SUFFIX ".dylib" | |
| 1852 #else | |
| 1853 #define JNI_LIB_SUFFIX ".so" | |
| 1854 #endif | |
| 1855 | |
| 1856 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; } | |
| 1857 | |
| 1858 // This must be hard coded because it's the system's temporary | |
| 1859 // directory not the java application's temp directory, ala java.io.tmpdir. | |
| 4006 | 1860 #ifdef __APPLE__ |
| 1861 // macosx has a secure per-user temporary directory | |
| 1862 char temp_path_storage[PATH_MAX]; | |
| 1863 const char* os::get_temp_directory() { | |
| 1864 static char *temp_path = NULL; | |
| 1865 if (temp_path == NULL) { | |
| 1866 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX); | |
| 1867 if (pathSize == 0 || pathSize > PATH_MAX) { | |
| 1868 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage)); | |
| 1869 } | |
| 1870 temp_path = temp_path_storage; | |
| 1871 } | |
| 1872 return temp_path; | |
| 1873 } | |
| 1874 #else /* __APPLE__ */ | |
| 3960 | 1875 const char* os::get_temp_directory() { return "/tmp"; } |
| 4006 | 1876 #endif /* __APPLE__ */ |
| 3960 | 1877 |
| 1878 static bool file_exists(const char* filename) { | |
| 1879 struct stat statbuf; | |
| 1880 if (filename == NULL || strlen(filename) == 0) { | |
| 1881 return false; | |
| 1882 } | |
| 1883 return os::stat(filename, &statbuf) == 0; | |
| 1884 } | |
| 1885 | |
| 1886 void os::dll_build_name(char* buffer, size_t buflen, | |
| 1887 const char* pname, const char* fname) { | |
| 1888 // Copied from libhpi | |
| 1889 const size_t pnamelen = pname ? strlen(pname) : 0; | |
| 1890 | |
| 1891 // Quietly truncate on buffer overflow. Should be an error. | |
| 1892 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) { | |
| 1893 *buffer = '\0'; | |
| 1894 return; | |
| 1895 } | |
| 1896 | |
| 1897 if (pnamelen == 0) { | |
| 1898 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname); | |
| 1899 } else if (strchr(pname, *os::path_separator()) != NULL) { | |
| 1900 int n; | |
| 1901 char** pelements = split_path(pname, &n); | |
| 1902 for (int i = 0 ; i < n ; i++) { | |
| 1903 // Really shouldn't be NULL, but check can't hurt | |
| 1904 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { | |
| 1905 continue; // skip the empty path values | |
| 1906 } | |
| 1907 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, | |
| 1908 pelements[i], fname); | |
| 1909 if (file_exists(buffer)) { | |
| 1910 break; | |
| 1911 } | |
| 1912 } | |
| 1913 // release the storage | |
| 1914 for (int i = 0 ; i < n ; i++) { | |
| 1915 if (pelements[i] != NULL) { | |
| 6197 | 1916 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); |
| 3960 | 1917 } |
| 1918 } | |
| 1919 if (pelements != NULL) { | |
| 6197 | 1920 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); |
| 3960 | 1921 } |
| 1922 } else { | |
| 1923 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname); | |
| 1924 } | |
| 1925 } | |
| 1926 | |
| 1927 const char* os::get_current_directory(char *buf, int buflen) { | |
| 1928 return getcwd(buf, buflen); | |
| 1929 } | |
| 1930 | |
| 1931 // check if addr is inside libjvm[_g].so | |
| 1932 bool os::address_is_in_vm(address addr) { | |
| 1933 static address libjvm_base_addr; | |
| 1934 Dl_info dlinfo; | |
| 1935 | |
| 1936 if (libjvm_base_addr == NULL) { | |
| 1937 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); | |
| 1938 libjvm_base_addr = (address)dlinfo.dli_fbase; | |
| 1939 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); | |
| 1940 } | |
| 1941 | |
| 1942 if (dladdr((void *)addr, &dlinfo)) { | |
| 1943 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; | |
| 1944 } | |
| 1945 | |
| 1946 return false; | |
| 1947 } | |
| 1948 | |
| 6258 | 1949 |
| 1950 #define MACH_MAXSYMLEN 256 | |
| 1951 | |
| 3960 | 1952 bool os::dll_address_to_function_name(address addr, char *buf, |
| 1953 int buflen, int *offset) { | |
| 1954 Dl_info dlinfo; | |
| 6258 | 1955 char localbuf[MACH_MAXSYMLEN]; |
| 1956 | |
| 1957 // dladdr will find names of dynamic functions only, but does | |
| 1958 // it set dli_fbase with mach_header address when it "fails" ? | |
| 3960 | 1959 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) { |
| 1960 if (buf != NULL) { | |
| 1961 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { | |
| 1962 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); | |
| 1963 } | |
| 1964 } | |
| 1965 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; | |
| 1966 return true; | |
| 1967 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { | |
| 1968 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), | |
|
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1969 buf, buflen, offset, dlinfo.dli_fname)) { |
| 3960 | 1970 return true; |
| 1971 } | |
| 1972 } | |
| 1973 | |
| 6258 | 1974 // Handle non-dymanic manually: |
| 1975 if (dlinfo.dli_fbase != NULL && | |
| 1976 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) { | |
| 1977 if(!Decoder::demangle(localbuf, buf, buflen)) { | |
| 1978 jio_snprintf(buf, buflen, "%s", localbuf); | |
| 1979 } | |
| 1980 return true; | |
| 1981 } | |
| 3960 | 1982 if (buf != NULL) buf[0] = '\0'; |
| 1983 if (offset != NULL) *offset = -1; | |
| 1984 return false; | |
| 1985 } | |
| 1986 | |
| 1987 #ifdef _ALLBSD_SOURCE | |
| 1988 // ported from solaris version | |
| 1989 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 1990 int buflen, int* offset) { | |
| 1991 Dl_info dlinfo; | |
| 1992 | |
| 1993 if (dladdr((void*)addr, &dlinfo)){ | |
| 1994 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
| 1995 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
| 1996 return true; | |
| 1997 } else { | |
| 1998 if (buf) buf[0] = '\0'; | |
| 1999 if (offset) *offset = -1; | |
| 2000 return false; | |
| 2001 } | |
| 2002 } | |
| 2003 #else | |
| 2004 struct _address_to_library_name { | |
| 2005 address addr; // input : memory address | |
| 2006 size_t buflen; // size of fname | |
| 2007 char* fname; // output: library name | |
| 2008 address base; // library base addr | |
| 2009 }; | |
| 2010 | |
| 2011 static int address_to_library_name_callback(struct dl_phdr_info *info, | |
| 2012 size_t size, void *data) { | |
| 2013 int i; | |
| 2014 bool found = false; | |
| 2015 address libbase = NULL; | |
| 2016 struct _address_to_library_name * d = (struct _address_to_library_name *)data; | |
| 2017 | |
| 2018 // iterate through all loadable segments | |
| 2019 for (i = 0; i < info->dlpi_phnum; i++) { | |
| 2020 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr); | |
| 2021 if (info->dlpi_phdr[i].p_type == PT_LOAD) { | |
| 2022 // base address of a library is the lowest address of its loaded | |
| 2023 // segments. | |
| 2024 if (libbase == NULL || libbase > segbase) { | |
| 2025 libbase = segbase; | |
| 2026 } | |
| 2027 // see if 'addr' is within current segment | |
| 2028 if (segbase <= d->addr && | |
| 2029 d->addr < segbase + info->dlpi_phdr[i].p_memsz) { | |
| 2030 found = true; | |
| 2031 } | |
| 2032 } | |
| 2033 } | |
| 2034 | |
| 2035 // dlpi_name is NULL or empty if the ELF file is executable, return 0 | |
| 2036 // so dll_address_to_library_name() can fall through to use dladdr() which | |
| 2037 // can figure out executable name from argv[0]. | |
| 2038 if (found && info->dlpi_name && info->dlpi_name[0]) { | |
| 2039 d->base = libbase; | |
| 2040 if (d->fname) { | |
| 2041 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name); | |
| 2042 } | |
| 2043 return 1; | |
| 2044 } | |
| 2045 return 0; | |
| 2046 } | |
| 2047 | |
| 2048 bool os::dll_address_to_library_name(address addr, char* buf, | |
| 2049 int buflen, int* offset) { | |
| 2050 Dl_info dlinfo; | |
| 2051 struct _address_to_library_name data; | |
| 2052 | |
| 2053 // There is a bug in old glibc dladdr() implementation that it could resolve | |
| 2054 // to wrong library name if the .so file has a base address != NULL. Here | |
| 2055 // we iterate through the program headers of all loaded libraries to find | |
| 2056 // out which library 'addr' really belongs to. This workaround can be | |
| 2057 // removed once the minimum requirement for glibc is moved to 2.3.x. | |
| 2058 data.addr = addr; | |
| 2059 data.fname = buf; | |
| 2060 data.buflen = buflen; | |
| 2061 data.base = NULL; | |
| 2062 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data); | |
| 2063 | |
| 2064 if (rslt) { | |
| 2065 // buf already contains library name | |
| 2066 if (offset) *offset = addr - data.base; | |
| 2067 return true; | |
| 2068 } else if (dladdr((void*)addr, &dlinfo)){ | |
| 2069 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); | |
| 2070 if (offset) *offset = addr - (address)dlinfo.dli_fbase; | |
| 2071 return true; | |
| 2072 } else { | |
| 2073 if (buf) buf[0] = '\0'; | |
| 2074 if (offset) *offset = -1; | |
| 2075 return false; | |
| 2076 } | |
| 2077 } | |
| 2078 #endif | |
| 2079 | |
| 2080 // Loads .dll/.so and | |
| 2081 // in case of error it checks if .dll/.so was built for the | |
| 2082 // same architecture as Hotspot is running on | |
| 2083 | |
| 2084 #ifdef __APPLE__ | |
| 2085 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { | |
| 2086 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 2087 if (result != NULL) { | |
| 2088 // Successful loading | |
| 2089 return result; | |
| 2090 } | |
| 2091 | |
| 2092 // Read system error message into ebuf | |
| 2093 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 2094 ebuf[ebuflen-1]='\0'; | |
| 2095 | |
| 2096 return NULL; | |
| 2097 } | |
| 2098 #else | |
| 2099 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) | |
| 2100 { | |
| 2101 void * result= ::dlopen(filename, RTLD_LAZY); | |
| 2102 if (result != NULL) { | |
| 2103 // Successful loading | |
| 2104 return result; | |
| 2105 } | |
| 2106 | |
| 2107 Elf32_Ehdr elf_head; | |
| 2108 | |
| 2109 // Read system error message into ebuf | |
| 2110 // It may or may not be overwritten below | |
| 2111 ::strncpy(ebuf, ::dlerror(), ebuflen-1); | |
| 2112 ebuf[ebuflen-1]='\0'; | |
| 2113 int diag_msg_max_length=ebuflen-strlen(ebuf); | |
| 2114 char* diag_msg_buf=ebuf+strlen(ebuf); | |
| 2115 | |
| 2116 if (diag_msg_max_length==0) { | |
| 2117 // No more space in ebuf for additional diagnostics message | |
| 2118 return NULL; | |
| 2119 } | |
| 2120 | |
| 2121 | |
| 2122 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); | |
| 2123 | |
| 2124 if (file_descriptor < 0) { | |
| 2125 // Can't open library, report dlerror() message | |
| 2126 return NULL; | |
| 2127 } | |
| 2128 | |
| 2129 bool failed_to_read_elf_head= | |
| 2130 (sizeof(elf_head)!= | |
| 2131 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; | |
| 2132 | |
| 2133 ::close(file_descriptor); | |
| 2134 if (failed_to_read_elf_head) { | |
| 2135 // file i/o error - report dlerror() msg | |
| 2136 return NULL; | |
| 2137 } | |
| 2138 | |
| 2139 typedef struct { | |
| 2140 Elf32_Half code; // Actual value as defined in elf.h | |
| 2141 Elf32_Half compat_class; // Compatibility of archs at VM's sense | |
| 2142 char elf_class; // 32 or 64 bit | |
| 2143 char endianess; // MSB or LSB | |
| 2144 char* name; // String representation | |
| 2145 } arch_t; | |
| 2146 | |
| 2147 #ifndef EM_486 | |
| 2148 #define EM_486 6 /* Intel 80486 */ | |
| 2149 #endif | |
| 2150 | |
| 2151 #ifndef EM_MIPS_RS3_LE | |
| 2152 #define EM_MIPS_RS3_LE 10 /* MIPS */ | |
| 2153 #endif | |
| 2154 | |
| 2155 #ifndef EM_PPC64 | |
| 2156 #define EM_PPC64 21 /* PowerPC64 */ | |
| 2157 #endif | |
| 2158 | |
| 2159 #ifndef EM_S390 | |
| 2160 #define EM_S390 22 /* IBM System/390 */ | |
| 2161 #endif | |
| 2162 | |
| 2163 #ifndef EM_IA_64 | |
| 2164 #define EM_IA_64 50 /* HP/Intel IA-64 */ | |
| 2165 #endif | |
| 2166 | |
| 2167 #ifndef EM_X86_64 | |
| 2168 #define EM_X86_64 62 /* AMD x86-64 */ | |
| 2169 #endif | |
| 2170 | |
| 2171 static const arch_t arch_array[]={ | |
| 2172 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 2173 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, | |
| 2174 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, | |
| 2175 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, | |
| 2176 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 2177 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, | |
| 2178 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, | |
| 2179 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, | |
| 2180 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, | |
| 2181 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, | |
| 2182 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"}, | |
| 2183 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"}, | |
| 2184 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"}, | |
| 2185 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"}, | |
| 2186 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"}, | |
| 2187 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"} | |
| 2188 }; | |
| 2189 | |
| 2190 #if (defined IA32) | |
| 2191 static Elf32_Half running_arch_code=EM_386; | |
| 2192 #elif (defined AMD64) | |
| 2193 static Elf32_Half running_arch_code=EM_X86_64; | |
| 2194 #elif (defined IA64) | |
| 2195 static Elf32_Half running_arch_code=EM_IA_64; | |
| 2196 #elif (defined __sparc) && (defined _LP64) | |
| 2197 static Elf32_Half running_arch_code=EM_SPARCV9; | |
| 2198 #elif (defined __sparc) && (!defined _LP64) | |
| 2199 static Elf32_Half running_arch_code=EM_SPARC; | |
| 2200 #elif (defined __powerpc64__) | |
| 2201 static Elf32_Half running_arch_code=EM_PPC64; | |
| 2202 #elif (defined __powerpc__) | |
| 2203 static Elf32_Half running_arch_code=EM_PPC; | |
| 2204 #elif (defined ARM) | |
| 2205 static Elf32_Half running_arch_code=EM_ARM; | |
| 2206 #elif (defined S390) | |
| 2207 static Elf32_Half running_arch_code=EM_S390; | |
| 2208 #elif (defined ALPHA) | |
| 2209 static Elf32_Half running_arch_code=EM_ALPHA; | |
| 2210 #elif (defined MIPSEL) | |
| 2211 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE; | |
| 2212 #elif (defined PARISC) | |
| 2213 static Elf32_Half running_arch_code=EM_PARISC; | |
| 2214 #elif (defined MIPS) | |
| 2215 static Elf32_Half running_arch_code=EM_MIPS; | |
| 2216 #elif (defined M68K) | |
| 2217 static Elf32_Half running_arch_code=EM_68K; | |
| 2218 #else | |
| 2219 #error Method os::dll_load requires that one of following is defined:\ | |
| 2220 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K | |
| 2221 #endif | |
| 2222 | |
| 2223 // Identify compatability class for VM's architecture and library's architecture | |
| 2224 // Obtain string descriptions for architectures | |
| 2225 | |
| 2226 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; | |
| 2227 int running_arch_index=-1; | |
| 2228 | |
| 2229 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { | |
| 2230 if (running_arch_code == arch_array[i].code) { | |
| 2231 running_arch_index = i; | |
| 2232 } | |
| 2233 if (lib_arch.code == arch_array[i].code) { | |
| 2234 lib_arch.compat_class = arch_array[i].compat_class; | |
| 2235 lib_arch.name = arch_array[i].name; | |
| 2236 } | |
| 2237 } | |
| 2238 | |
| 2239 assert(running_arch_index != -1, | |
| 2240 "Didn't find running architecture code (running_arch_code) in arch_array"); | |
| 2241 if (running_arch_index == -1) { | |
| 2242 // Even though running architecture detection failed | |
| 2243 // we may still continue with reporting dlerror() message | |
| 2244 return NULL; | |
| 2245 } | |
| 2246 | |
| 2247 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { | |
| 2248 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); | |
| 2249 return NULL; | |
| 2250 } | |
| 2251 | |
| 2252 #ifndef S390 | |
| 2253 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { | |
| 2254 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); | |
| 2255 return NULL; | |
| 2256 } | |
| 2257 #endif // !S390 | |
| 2258 | |
| 2259 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { | |
| 2260 if ( lib_arch.name!=NULL ) { | |
| 2261 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 2262 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", | |
| 2263 lib_arch.name, arch_array[running_arch_index].name); | |
| 2264 } else { | |
| 2265 ::snprintf(diag_msg_buf, diag_msg_max_length-1, | |
| 2266 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", | |
| 2267 lib_arch.code, | |
| 2268 arch_array[running_arch_index].name); | |
| 2269 } | |
| 2270 } | |
| 2271 | |
| 2272 return NULL; | |
| 2273 } | |
| 2274 #endif /* !__APPLE__ */ | |
| 2275 | |
| 2276 // XXX: Do we need a lock around this as per Linux? | |
| 2277 void* os::dll_lookup(void* handle, const char* name) { | |
| 2278 return dlsym(handle, name); | |
| 2279 } | |
| 2280 | |
| 2281 | |
| 2282 static bool _print_ascii_file(const char* filename, outputStream* st) { | |
| 2283 int fd = ::open(filename, O_RDONLY); | |
| 2284 if (fd == -1) { | |
| 2285 return false; | |
| 2286 } | |
| 2287 | |
| 2288 char buf[32]; | |
| 2289 int bytes; | |
| 2290 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { | |
| 2291 st->print_raw(buf, bytes); | |
| 2292 } | |
| 2293 | |
| 2294 ::close(fd); | |
| 2295 | |
| 2296 return true; | |
| 2297 } | |
| 2298 | |
| 2299 void os::print_dll_info(outputStream *st) { | |
| 2300 st->print_cr("Dynamic libraries:"); | |
| 2301 #ifdef _ALLBSD_SOURCE | |
| 2302 #ifdef RTLD_DI_LINKMAP | |
| 2303 Dl_info dli; | |
| 2304 void *handle; | |
| 2305 Link_map *map; | |
| 2306 Link_map *p; | |
| 2307 | |
| 2308 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { | |
| 2309 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 2310 return; | |
| 2311 } | |
| 2312 handle = dlopen(dli.dli_fname, RTLD_LAZY); | |
| 2313 if (handle == NULL) { | |
| 2314 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 2315 return; | |
| 2316 } | |
| 2317 dlinfo(handle, RTLD_DI_LINKMAP, &map); | |
| 2318 if (map == NULL) { | |
| 2319 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 2320 return; | |
| 2321 } | |
| 2322 | |
| 2323 while (map->l_prev != NULL) | |
| 2324 map = map->l_prev; | |
| 2325 | |
| 2326 while (map != NULL) { | |
| 2327 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); | |
| 2328 map = map->l_next; | |
| 2329 } | |
| 2330 | |
| 2331 dlclose(handle); | |
| 2332 #elif defined(__APPLE__) | |
| 2333 uint32_t count; | |
| 2334 uint32_t i; | |
| 2335 | |
| 2336 count = _dyld_image_count(); | |
| 2337 for (i = 1; i < count; i++) { | |
| 2338 const char *name = _dyld_get_image_name(i); | |
| 2339 intptr_t slide = _dyld_get_image_vmaddr_slide(i); | |
| 2340 st->print_cr(PTR_FORMAT " \t%s", slide, name); | |
| 2341 } | |
| 2342 #else | |
| 2343 st->print_cr("Error: Cannot print dynamic libraries."); | |
| 2344 #endif | |
| 2345 #else | |
| 2346 char fname[32]; | |
| 2347 pid_t pid = os::Bsd::gettid(); | |
| 2348 | |
| 2349 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid); | |
| 2350 | |
| 2351 if (!_print_ascii_file(fname, st)) { | |
| 2352 st->print("Can not get library information for pid = %d\n", pid); | |
| 2353 } | |
| 2354 #endif | |
| 2355 } | |
| 2356 | |
|
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2357 void os::print_os_info_brief(outputStream* st) { |
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2358 st->print("Bsd"); |
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2359 |
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2360 os::Posix::print_uname_info(st); |
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2361 } |
| 3960 | 2362 |
| 2363 void os::print_os_info(outputStream* st) { | |
| 2364 st->print("OS:"); | |
|
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2365 st->print("Bsd"); |
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2366 |
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2367 os::Posix::print_uname_info(st); |
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2368 |
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2369 os::Posix::print_rlimit_info(st); |
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2370 |
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2371 os::Posix::print_load_average(st); |
| 3960 | 2372 } |
| 2373 | |
| 2374 void os::pd_print_cpu_info(outputStream* st) { | |
| 2375 // Nothing to do for now. | |
| 2376 } | |
| 2377 | |
| 2378 void os::print_memory_info(outputStream* st) { | |
| 2379 | |
| 2380 st->print("Memory:"); | |
| 2381 st->print(" %dk page", os::vm_page_size()>>10); | |
| 2382 | |
| 2383 #ifndef _ALLBSD_SOURCE | |
| 2384 // values in struct sysinfo are "unsigned long" | |
| 2385 struct sysinfo si; | |
| 2386 sysinfo(&si); | |
| 2387 #endif | |
| 2388 | |
| 2389 st->print(", physical " UINT64_FORMAT "k", | |
| 2390 os::physical_memory() >> 10); | |
| 2391 st->print("(" UINT64_FORMAT "k free)", | |
| 2392 os::available_memory() >> 10); | |
| 2393 #ifndef _ALLBSD_SOURCE | |
| 2394 st->print(", swap " UINT64_FORMAT "k", | |
| 2395 ((jlong)si.totalswap * si.mem_unit) >> 10); | |
| 2396 st->print("(" UINT64_FORMAT "k free)", | |
| 2397 ((jlong)si.freeswap * si.mem_unit) >> 10); | |
| 2398 #endif | |
| 2399 st->cr(); | |
| 2400 | |
| 2401 // meminfo | |
| 2402 st->print("\n/proc/meminfo:\n"); | |
| 2403 _print_ascii_file("/proc/meminfo", st); | |
| 2404 st->cr(); | |
| 2405 } | |
| 2406 | |
| 2407 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific | |
| 2408 // but they're the same for all the bsd arch that we support | |
| 2409 // and they're the same for solaris but there's no common place to put this. | |
| 2410 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", | |
| 2411 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", | |
| 2412 "ILL_COPROC", "ILL_BADSTK" }; | |
| 2413 | |
| 2414 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", | |
| 2415 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", | |
| 2416 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" }; | |
| 2417 | |
| 2418 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; | |
| 2419 | |
| 2420 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; | |
| 2421 | |
| 2422 void os::print_siginfo(outputStream* st, void* siginfo) { | |
| 2423 st->print("siginfo:"); | |
| 2424 | |
| 2425 const int buflen = 100; | |
| 2426 char buf[buflen]; | |
| 2427 siginfo_t *si = (siginfo_t*)siginfo; | |
| 2428 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); | |
| 2429 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) { | |
| 2430 st->print("si_errno=%s", buf); | |
| 2431 } else { | |
| 2432 st->print("si_errno=%d", si->si_errno); | |
| 2433 } | |
| 2434 const int c = si->si_code; | |
| 2435 assert(c > 0, "unexpected si_code"); | |
| 2436 switch (si->si_signo) { | |
| 2437 case SIGILL: | |
| 2438 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); | |
| 2439 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 2440 break; | |
| 2441 case SIGFPE: | |
| 2442 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); | |
| 2443 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 2444 break; | |
| 2445 case SIGSEGV: | |
| 2446 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); | |
| 2447 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 2448 break; | |
| 2449 case SIGBUS: | |
| 2450 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); | |
| 2451 st->print(", si_addr=" PTR_FORMAT, si->si_addr); | |
| 2452 break; | |
| 2453 default: | |
| 2454 st->print(", si_code=%d", si->si_code); | |
| 2455 // no si_addr | |
| 2456 } | |
| 2457 | |
| 2458 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && | |
| 2459 UseSharedSpaces) { | |
| 2460 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 2461 if (mapinfo->is_in_shared_space(si->si_addr)) { | |
| 2462 st->print("\n\nError accessing class data sharing archive." \ | |
| 2463 " Mapped file inaccessible during execution, " \ | |
| 2464 " possible disk/network problem."); | |
| 2465 } | |
| 2466 } | |
| 2467 st->cr(); | |
| 2468 } | |
| 2469 | |
| 2470 | |
| 2471 static void print_signal_handler(outputStream* st, int sig, | |
| 2472 char* buf, size_t buflen); | |
| 2473 | |
| 2474 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { | |
| 2475 st->print_cr("Signal Handlers:"); | |
| 2476 print_signal_handler(st, SIGSEGV, buf, buflen); | |
| 2477 print_signal_handler(st, SIGBUS , buf, buflen); | |
| 2478 print_signal_handler(st, SIGFPE , buf, buflen); | |
| 2479 print_signal_handler(st, SIGPIPE, buf, buflen); | |
| 2480 print_signal_handler(st, SIGXFSZ, buf, buflen); | |
| 2481 print_signal_handler(st, SIGILL , buf, buflen); | |
| 2482 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); | |
| 2483 print_signal_handler(st, SR_signum, buf, buflen); | |
| 2484 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); | |
| 2485 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); | |
| 2486 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); | |
| 2487 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); | |
| 2488 } | |
| 2489 | |
| 2490 static char saved_jvm_path[MAXPATHLEN] = {0}; | |
| 2491 | |
| 4846 | 2492 // Find the full path to the current module, libjvm or libjvm_g |
| 3960 | 2493 void os::jvm_path(char *buf, jint buflen) { |
| 2494 // Error checking. | |
| 2495 if (buflen < MAXPATHLEN) { | |
| 2496 assert(false, "must use a large-enough buffer"); | |
| 2497 buf[0] = '\0'; | |
| 2498 return; | |
| 2499 } | |
| 2500 // Lazy resolve the path to current module. | |
| 2501 if (saved_jvm_path[0] != 0) { | |
| 2502 strcpy(buf, saved_jvm_path); | |
| 2503 return; | |
| 2504 } | |
| 2505 | |
| 2506 char dli_fname[MAXPATHLEN]; | |
| 2507 bool ret = dll_address_to_library_name( | |
| 2508 CAST_FROM_FN_PTR(address, os::jvm_path), | |
| 2509 dli_fname, sizeof(dli_fname), NULL); | |
| 2510 assert(ret != 0, "cannot locate libjvm"); | |
| 2511 char *rp = realpath(dli_fname, buf); | |
| 2512 if (rp == NULL) | |
| 2513 return; | |
| 2514 | |
| 2515 if (Arguments::created_by_gamma_launcher()) { | |
| 2516 // Support for the gamma launcher. Typical value for buf is | |
| 4846 | 2517 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at |
| 3960 | 2518 // the right place in the string, then assume we are installed in a JDK and |
| 4846 | 2519 // we're done. Otherwise, check for a JAVA_HOME environment variable and |
| 2520 // construct a path to the JVM being overridden. | |
| 2521 | |
| 3960 | 2522 const char *p = buf + strlen(buf) - 1; |
| 2523 for (int count = 0; p > buf && count < 5; ++count) { | |
| 2524 for (--p; p > buf && *p != '/'; --p) | |
| 2525 /* empty */ ; | |
| 2526 } | |
| 2527 | |
| 2528 if (strncmp(p, "/jre/lib/", 9) != 0) { | |
| 2529 // Look for JAVA_HOME in the environment. | |
| 2530 char* java_home_var = ::getenv("JAVA_HOME"); | |
| 2531 if (java_home_var != NULL && java_home_var[0] != 0) { | |
| 2532 char* jrelib_p; | |
| 2533 int len; | |
| 2534 | |
| 4846 | 2535 // Check the current module name "libjvm" or "libjvm_g". |
| 3960 | 2536 p = strrchr(buf, '/'); |
| 2537 assert(strstr(p, "/libjvm") == p, "invalid library name"); | |
| 2538 p = strstr(p, "_g") ? "_g" : ""; | |
| 2539 | |
| 2540 rp = realpath(java_home_var, buf); | |
| 2541 if (rp == NULL) | |
| 2542 return; | |
| 2543 | |
| 2544 // determine if this is a legacy image or modules image | |
| 2545 // modules image doesn't have "jre" subdirectory | |
| 2546 len = strlen(buf); | |
| 2547 jrelib_p = buf + len; | |
| 4846 | 2548 |
| 2549 // Add the appropriate library subdir | |
| 2550 snprintf(jrelib_p, buflen-len, "/jre/lib"); | |
| 3960 | 2551 if (0 != access(buf, F_OK)) { |
| 4846 | 2552 snprintf(jrelib_p, buflen-len, "/lib"); |
| 3960 | 2553 } |
| 2554 | |
| 4846 | 2555 // Add the appropriate client or server subdir |
| 2556 len = strlen(buf); | |
| 2557 jrelib_p = buf + len; | |
| 2558 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT); | |
| 2559 if (0 != access(buf, F_OK)) { | |
| 2560 snprintf(jrelib_p, buflen-len, ""); | |
| 2561 } | |
| 2562 | |
| 2563 // If the path exists within JAVA_HOME, add the JVM library name | |
| 2564 // to complete the path to JVM being overridden. Otherwise fallback | |
| 2565 // to the path to the current library. | |
| 3960 | 2566 if (0 == access(buf, F_OK)) { |
| 4846 | 2567 // Use current module name "libjvm[_g]" instead of |
| 2568 // "libjvm"debug_only("_g")"" since for fastdebug version | |
| 2569 // we should have "libjvm" but debug_only("_g") adds "_g"! | |
| 3960 | 2570 len = strlen(buf); |
| 4846 | 2571 snprintf(buf + len, buflen-len, "/libjvm%s%s", p, JNI_LIB_SUFFIX); |
| 3960 | 2572 } else { |
| 4846 | 2573 // Fall back to path of current library |
| 3960 | 2574 rp = realpath(dli_fname, buf); |
| 2575 if (rp == NULL) | |
| 2576 return; | |
| 2577 } | |
| 2578 } | |
| 2579 } | |
| 2580 } | |
| 2581 | |
| 2582 strcpy(saved_jvm_path, buf); | |
| 2583 } | |
| 2584 | |
| 2585 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { | |
| 2586 // no prefix required, not even "_" | |
| 2587 } | |
| 2588 | |
| 2589 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { | |
| 2590 // no suffix required | |
| 2591 } | |
| 2592 | |
| 2593 //////////////////////////////////////////////////////////////////////////////// | |
| 2594 // sun.misc.Signal support | |
| 2595 | |
| 2596 static volatile jint sigint_count = 0; | |
| 2597 | |
| 2598 static void | |
| 2599 UserHandler(int sig, void *siginfo, void *context) { | |
| 2600 // 4511530 - sem_post is serialized and handled by the manager thread. When | |
| 2601 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We | |
| 2602 // don't want to flood the manager thread with sem_post requests. | |
| 2603 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) | |
| 2604 return; | |
| 2605 | |
| 2606 // Ctrl-C is pressed during error reporting, likely because the error | |
| 2607 // handler fails to abort. Let VM die immediately. | |
| 2608 if (sig == SIGINT && is_error_reported()) { | |
| 2609 os::die(); | |
| 2610 } | |
| 2611 | |
| 2612 os::signal_notify(sig); | |
| 2613 } | |
| 2614 | |
| 2615 void* os::user_handler() { | |
| 2616 return CAST_FROM_FN_PTR(void*, UserHandler); | |
| 2617 } | |
| 2618 | |
| 2619 extern "C" { | |
| 2620 typedef void (*sa_handler_t)(int); | |
| 2621 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
| 2622 } | |
| 2623 | |
| 2624 void* os::signal(int signal_number, void* handler) { | |
| 2625 struct sigaction sigAct, oldSigAct; | |
| 2626 | |
| 2627 sigfillset(&(sigAct.sa_mask)); | |
| 2628 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 2629 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); | |
| 2630 | |
| 2631 if (sigaction(signal_number, &sigAct, &oldSigAct)) { | |
| 2632 // -1 means registration failed | |
| 2633 return (void *)-1; | |
| 2634 } | |
| 2635 | |
| 2636 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); | |
| 2637 } | |
| 2638 | |
| 2639 void os::signal_raise(int signal_number) { | |
| 2640 ::raise(signal_number); | |
| 2641 } | |
| 2642 | |
| 2643 /* | |
| 2644 * The following code is moved from os.cpp for making this | |
| 2645 * code platform specific, which it is by its very nature. | |
| 2646 */ | |
| 2647 | |
| 2648 // Will be modified when max signal is changed to be dynamic | |
| 2649 int os::sigexitnum_pd() { | |
| 2650 return NSIG; | |
| 2651 } | |
| 2652 | |
| 2653 // a counter for each possible signal value | |
| 2654 static volatile jint pending_signals[NSIG+1] = { 0 }; | |
| 2655 | |
| 2656 // Bsd(POSIX) specific hand shaking semaphore. | |
| 2657 #ifdef __APPLE__ | |
| 2658 static semaphore_t sig_sem; | |
| 2659 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value) | |
| 2660 #define SEM_WAIT(sem) semaphore_wait(sem); | |
| 2661 #define SEM_POST(sem) semaphore_signal(sem); | |
| 2662 #else | |
| 2663 static sem_t sig_sem; | |
| 2664 #define SEM_INIT(sem, value) sem_init(&sem, 0, value) | |
| 2665 #define SEM_WAIT(sem) sem_wait(&sem); | |
| 2666 #define SEM_POST(sem) sem_post(&sem); | |
| 2667 #endif | |
| 2668 | |
| 2669 void os::signal_init_pd() { | |
| 2670 // Initialize signal structures | |
| 2671 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); | |
| 2672 | |
| 2673 // Initialize signal semaphore | |
| 2674 ::SEM_INIT(sig_sem, 0); | |
| 2675 } | |
| 2676 | |
| 2677 void os::signal_notify(int sig) { | |
| 2678 Atomic::inc(&pending_signals[sig]); | |
| 2679 ::SEM_POST(sig_sem); | |
| 2680 } | |
| 2681 | |
| 2682 static int check_pending_signals(bool wait) { | |
| 2683 Atomic::store(0, &sigint_count); | |
| 2684 for (;;) { | |
| 2685 for (int i = 0; i < NSIG + 1; i++) { | |
| 2686 jint n = pending_signals[i]; | |
| 2687 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { | |
| 2688 return i; | |
| 2689 } | |
| 2690 } | |
| 2691 if (!wait) { | |
| 2692 return -1; | |
| 2693 } | |
| 2694 JavaThread *thread = JavaThread::current(); | |
| 2695 ThreadBlockInVM tbivm(thread); | |
| 2696 | |
| 2697 bool threadIsSuspended; | |
| 2698 do { | |
| 2699 thread->set_suspend_equivalent(); | |
| 2700 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 2701 ::SEM_WAIT(sig_sem); | |
| 2702 | |
| 2703 // were we externally suspended while we were waiting? | |
| 2704 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); | |
| 2705 if (threadIsSuspended) { | |
| 2706 // | |
| 2707 // The semaphore has been incremented, but while we were waiting | |
| 2708 // another thread suspended us. We don't want to continue running | |
| 2709 // while suspended because that would surprise the thread that | |
| 2710 // suspended us. | |
| 2711 // | |
| 2712 ::SEM_POST(sig_sem); | |
| 2713 | |
| 2714 thread->java_suspend_self(); | |
| 2715 } | |
| 2716 } while (threadIsSuspended); | |
| 2717 } | |
| 2718 } | |
| 2719 | |
| 2720 int os::signal_lookup() { | |
| 2721 return check_pending_signals(false); | |
| 2722 } | |
| 2723 | |
| 2724 int os::signal_wait() { | |
| 2725 return check_pending_signals(true); | |
| 2726 } | |
| 2727 | |
| 2728 //////////////////////////////////////////////////////////////////////////////// | |
| 2729 // Virtual Memory | |
| 2730 | |
| 2731 int os::vm_page_size() { | |
| 2732 // Seems redundant as all get out | |
| 2733 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 2734 return os::Bsd::page_size(); | |
| 2735 } | |
| 2736 | |
| 2737 // Solaris allocates memory by pages. | |
| 2738 int os::vm_allocation_granularity() { | |
| 2739 assert(os::Bsd::page_size() != -1, "must call os::init"); | |
| 2740 return os::Bsd::page_size(); | |
| 2741 } | |
| 2742 | |
| 2743 // Rationale behind this function: | |
| 2744 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable | |
| 2745 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get | |
| 2746 // samples for JITted code. Here we create private executable mapping over the code cache | |
| 2747 // and then we can use standard (well, almost, as mapping can change) way to provide | |
| 2748 // info for the reporting script by storing timestamp and location of symbol | |
| 2749 void bsd_wrap_code(char* base, size_t size) { | |
| 2750 static volatile jint cnt = 0; | |
| 2751 | |
| 2752 if (!UseOprofile) { | |
| 2753 return; | |
| 2754 } | |
| 2755 | |
| 2756 char buf[PATH_MAX + 1]; | |
| 2757 int num = Atomic::add(1, &cnt); | |
| 2758 | |
| 2759 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d", | |
| 2760 os::get_temp_directory(), os::current_process_id(), num); | |
| 2761 unlink(buf); | |
| 2762 | |
| 2763 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU); | |
| 2764 | |
| 2765 if (fd != -1) { | |
| 2766 off_t rv = ::lseek(fd, size-2, SEEK_SET); | |
| 2767 if (rv != (off_t)-1) { | |
| 2768 if (::write(fd, "", 1) == 1) { | |
| 2769 mmap(base, size, | |
| 2770 PROT_READ|PROT_WRITE|PROT_EXEC, | |
| 2771 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0); | |
| 2772 } | |
| 2773 } | |
| 2774 ::close(fd); | |
| 2775 unlink(buf); | |
| 2776 } | |
| 2777 } | |
| 2778 | |
| 2779 // NOTE: Bsd kernel does not really reserve the pages for us. | |
| 2780 // All it does is to check if there are enough free pages | |
| 2781 // left at the time of mmap(). This could be a potential | |
| 2782 // problem. | |
| 6197 | 2783 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { |
| 3960 | 2784 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; |
| 2785 #ifdef __OpenBSD__ | |
| 2786 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 2787 return ::mprotect(addr, size, prot) == 0; | |
| 2788 #else | |
| 2789 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot, | |
| 2790 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0); | |
| 2791 return res != (uintptr_t) MAP_FAILED; | |
| 2792 #endif | |
| 2793 } | |
| 2794 | |
| 2795 #ifndef _ALLBSD_SOURCE | |
| 2796 // Define MAP_HUGETLB here so we can build HotSpot on old systems. | |
| 2797 #ifndef MAP_HUGETLB | |
| 2798 #define MAP_HUGETLB 0x40000 | |
| 2799 #endif | |
| 2800 | |
| 2801 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems. | |
| 2802 #ifndef MADV_HUGEPAGE | |
| 2803 #define MADV_HUGEPAGE 14 | |
| 2804 #endif | |
| 2805 #endif | |
| 2806 | |
| 6197 | 2807 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, |
| 3960 | 2808 bool exec) { |
| 2809 #ifndef _ALLBSD_SOURCE | |
| 2810 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { | |
| 2811 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; | |
| 2812 uintptr_t res = | |
| 2813 (uintptr_t) ::mmap(addr, size, prot, | |
| 2814 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB, | |
| 2815 -1, 0); | |
| 2816 return res != (uintptr_t) MAP_FAILED; | |
| 2817 } | |
| 2818 #endif | |
| 2819 | |
| 2820 return commit_memory(addr, size, exec); | |
| 2821 } | |
| 2822 | |
| 6197 | 2823 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2824 #ifndef _ALLBSD_SOURCE |
| 2825 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) { | |
| 2826 // We don't check the return value: madvise(MADV_HUGEPAGE) may not | |
| 2827 // be supported or the memory may already be backed by huge pages. | |
| 2828 ::madvise(addr, bytes, MADV_HUGEPAGE); | |
| 2829 } | |
| 2830 #endif | |
| 2831 } | |
| 2832 | |
| 6197 | 2833 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { |
| 3960 | 2834 ::madvise(addr, bytes, MADV_DONTNEED); |
| 2835 } | |
| 2836 | |
| 2837 void os::numa_make_global(char *addr, size_t bytes) { | |
| 2838 } | |
| 2839 | |
| 2840 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { | |
| 2841 } | |
| 2842 | |
| 2843 bool os::numa_topology_changed() { return false; } | |
| 2844 | |
| 2845 size_t os::numa_get_groups_num() { | |
| 2846 return 1; | |
| 2847 } | |
| 2848 | |
| 2849 int os::numa_get_group_id() { | |
| 2850 return 0; | |
| 2851 } | |
| 2852 | |
| 2853 size_t os::numa_get_leaf_groups(int *ids, size_t size) { | |
| 2854 if (size > 0) { | |
| 2855 ids[0] = 0; | |
| 2856 return 1; | |
| 2857 } | |
| 2858 return 0; | |
| 2859 } | |
| 2860 | |
| 2861 bool os::get_page_info(char *start, page_info* info) { | |
| 2862 return false; | |
| 2863 } | |
| 2864 | |
| 2865 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { | |
| 2866 return end; | |
| 2867 } | |
| 2868 | |
| 2869 #ifndef _ALLBSD_SOURCE | |
| 2870 // Something to do with the numa-aware allocator needs these symbols | |
| 2871 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { } | |
| 2872 extern "C" JNIEXPORT void numa_error(char *where) { } | |
| 2873 extern "C" JNIEXPORT int fork1() { return fork(); } | |
| 2874 | |
| 2875 | |
| 2876 // If we are running with libnuma version > 2, then we should | |
| 2877 // be trying to use symbols with versions 1.1 | |
| 2878 // If we are running with earlier version, which did not have symbol versions, | |
| 2879 // we should use the base version. | |
| 2880 void* os::Bsd::libnuma_dlsym(void* handle, const char *name) { | |
| 2881 void *f = dlvsym(handle, name, "libnuma_1.1"); | |
| 2882 if (f == NULL) { | |
| 2883 f = dlsym(handle, name); | |
| 2884 } | |
| 2885 return f; | |
| 2886 } | |
| 2887 | |
| 2888 bool os::Bsd::libnuma_init() { | |
| 2889 // sched_getcpu() should be in libc. | |
| 2890 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t, | |
| 2891 dlsym(RTLD_DEFAULT, "sched_getcpu"))); | |
| 2892 | |
| 2893 if (sched_getcpu() != -1) { // Does it work? | |
| 2894 void *handle = dlopen("libnuma.so.1", RTLD_LAZY); | |
| 2895 if (handle != NULL) { | |
| 2896 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t, | |
| 2897 libnuma_dlsym(handle, "numa_node_to_cpus"))); | |
| 2898 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t, | |
| 2899 libnuma_dlsym(handle, "numa_max_node"))); | |
| 2900 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t, | |
| 2901 libnuma_dlsym(handle, "numa_available"))); | |
| 2902 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t, | |
| 2903 libnuma_dlsym(handle, "numa_tonode_memory"))); | |
| 2904 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t, | |
| 2905 libnuma_dlsym(handle, "numa_interleave_memory"))); | |
| 2906 | |
| 2907 | |
| 2908 if (numa_available() != -1) { | |
| 2909 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes")); | |
| 2910 // Create a cpu -> node mapping | |
| 2911 _cpu_to_node = new (ResourceObj::C_HEAP) GrowableArray<int>(0, true); | |
| 2912 rebuild_cpu_to_node_map(); | |
| 2913 return true; | |
| 2914 } | |
| 2915 } | |
| 2916 } | |
| 2917 return false; | |
| 2918 } | |
| 2919 | |
| 2920 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id. | |
| 2921 // The table is later used in get_node_by_cpu(). | |
| 2922 void os::Bsd::rebuild_cpu_to_node_map() { | |
| 2923 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure | |
| 2924 // in libnuma (possible values are starting from 16, | |
| 2925 // and continuing up with every other power of 2, but less | |
| 2926 // than the maximum number of CPUs supported by kernel), and | |
| 2927 // is a subject to change (in libnuma version 2 the requirements | |
| 2928 // are more reasonable) we'll just hardcode the number they use | |
| 2929 // in the library. | |
| 2930 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT; | |
| 2931 | |
| 2932 size_t cpu_num = os::active_processor_count(); | |
| 2933 size_t cpu_map_size = NCPUS / BitsPerCLong; | |
| 2934 size_t cpu_map_valid_size = | |
| 2935 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size); | |
| 2936 | |
| 2937 cpu_to_node()->clear(); | |
| 2938 cpu_to_node()->at_grow(cpu_num - 1); | |
| 2939 size_t node_num = numa_get_groups_num(); | |
| 2940 | |
| 2941 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size); | |
| 2942 for (size_t i = 0; i < node_num; i++) { | |
| 2943 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) { | |
| 2944 for (size_t j = 0; j < cpu_map_valid_size; j++) { | |
| 2945 if (cpu_map[j] != 0) { | |
| 2946 for (size_t k = 0; k < BitsPerCLong; k++) { | |
| 2947 if (cpu_map[j] & (1UL << k)) { | |
| 2948 cpu_to_node()->at_put(j * BitsPerCLong + k, i); | |
| 2949 } | |
| 2950 } | |
| 2951 } | |
| 2952 } | |
| 2953 } | |
| 2954 } | |
| 2955 FREE_C_HEAP_ARRAY(unsigned long, cpu_map); | |
| 2956 } | |
| 2957 | |
| 2958 int os::Bsd::get_node_by_cpu(int cpu_id) { | |
| 2959 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) { | |
| 2960 return cpu_to_node()->at(cpu_id); | |
| 2961 } | |
| 2962 return -1; | |
| 2963 } | |
| 2964 | |
| 2965 GrowableArray<int>* os::Bsd::_cpu_to_node; | |
| 2966 os::Bsd::sched_getcpu_func_t os::Bsd::_sched_getcpu; | |
| 2967 os::Bsd::numa_node_to_cpus_func_t os::Bsd::_numa_node_to_cpus; | |
| 2968 os::Bsd::numa_max_node_func_t os::Bsd::_numa_max_node; | |
| 2969 os::Bsd::numa_available_func_t os::Bsd::_numa_available; | |
| 2970 os::Bsd::numa_tonode_memory_func_t os::Bsd::_numa_tonode_memory; | |
| 2971 os::Bsd::numa_interleave_memory_func_t os::Bsd::_numa_interleave_memory; | |
| 2972 unsigned long* os::Bsd::_numa_all_nodes; | |
| 2973 #endif | |
| 2974 | |
| 6197 | 2975 bool os::pd_uncommit_memory(char* addr, size_t size) { |
| 3960 | 2976 #ifdef __OpenBSD__ |
| 2977 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD | |
| 2978 return ::mprotect(addr, size, PROT_NONE) == 0; | |
| 2979 #else | |
| 2980 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE, | |
| 2981 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0); | |
| 2982 return res != (uintptr_t) MAP_FAILED; | |
| 2983 #endif | |
| 2984 } | |
| 2985 | |
| 6197 | 2986 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { |
| 3960 | 2987 return os::commit_memory(addr, size); |
| 2988 } | |
| 2989 | |
| 2990 // If this is a growable mapping, remove the guard pages entirely by | |
| 2991 // munmap()ping them. If not, just call uncommit_memory(). | |
| 2992 bool os::remove_stack_guard_pages(char* addr, size_t size) { | |
| 2993 return os::uncommit_memory(addr, size); | |
| 2994 } | |
| 2995 | |
| 2996 static address _highest_vm_reserved_address = NULL; | |
| 2997 | |
| 2998 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory | |
| 2999 // at 'requested_addr'. If there are existing memory mappings at the same | |
| 3000 // location, however, they will be overwritten. If 'fixed' is false, | |
| 3001 // 'requested_addr' is only treated as a hint, the return value may or | |
| 3002 // may not start from the requested address. Unlike Bsd mmap(), this | |
| 3003 // function returns NULL to indicate failure. | |
| 3004 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) { | |
| 3005 char * addr; | |
| 3006 int flags; | |
| 3007 | |
| 3008 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS; | |
| 3009 if (fixed) { | |
| 3010 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address"); | |
| 3011 flags |= MAP_FIXED; | |
| 3012 } | |
| 3013 | |
| 3014 // Map uncommitted pages PROT_READ and PROT_WRITE, change access | |
| 3015 // to PROT_EXEC if executable when we commit the page. | |
| 3016 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE, | |
| 3017 flags, -1, 0); | |
| 3018 | |
| 3019 if (addr != MAP_FAILED) { | |
| 3020 // anon_mmap() should only get called during VM initialization, | |
| 3021 // don't need lock (actually we can skip locking even it can be called | |
| 3022 // from multiple threads, because _highest_vm_reserved_address is just a | |
| 3023 // hint about the upper limit of non-stack memory regions.) | |
| 3024 if ((address)addr + bytes > _highest_vm_reserved_address) { | |
| 3025 _highest_vm_reserved_address = (address)addr + bytes; | |
| 3026 } | |
| 3027 } | |
| 3028 | |
| 3029 return addr == MAP_FAILED ? NULL : addr; | |
| 3030 } | |
| 3031 | |
| 3032 // Don't update _highest_vm_reserved_address, because there might be memory | |
| 3033 // regions above addr + size. If so, releasing a memory region only creates | |
| 3034 // a hole in the address space, it doesn't help prevent heap-stack collision. | |
| 3035 // | |
| 3036 static int anon_munmap(char * addr, size_t size) { | |
| 3037 return ::munmap(addr, size) == 0; | |
| 3038 } | |
| 3039 | |
| 6197 | 3040 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, |
| 3960 | 3041 size_t alignment_hint) { |
| 3042 return anon_mmap(requested_addr, bytes, (requested_addr != NULL)); | |
| 3043 } | |
| 3044 | |
| 6197 | 3045 bool os::pd_release_memory(char* addr, size_t size) { |
| 3960 | 3046 return anon_munmap(addr, size); |
| 3047 } | |
| 3048 | |
| 3049 static address highest_vm_reserved_address() { | |
| 3050 return _highest_vm_reserved_address; | |
| 3051 } | |
| 3052 | |
| 3053 static bool bsd_mprotect(char* addr, size_t size, int prot) { | |
| 3054 // Bsd wants the mprotect address argument to be page aligned. | |
| 3055 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size()); | |
| 3056 | |
| 3057 // According to SUSv3, mprotect() should only be used with mappings | |
| 3058 // established by mmap(), and mmap() always maps whole pages. Unaligned | |
| 3059 // 'addr' likely indicates problem in the VM (e.g. trying to change | |
| 3060 // protection of malloc'ed or statically allocated memory). Check the | |
| 3061 // caller if you hit this assert. | |
| 3062 assert(addr == bottom, "sanity check"); | |
| 3063 | |
| 3064 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size()); | |
| 3065 return ::mprotect(bottom, size, prot) == 0; | |
| 3066 } | |
| 3067 | |
| 3068 // Set protections specified | |
| 3069 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, | |
| 3070 bool is_committed) { | |
| 3071 unsigned int p = 0; | |
| 3072 switch (prot) { | |
| 3073 case MEM_PROT_NONE: p = PROT_NONE; break; | |
| 3074 case MEM_PROT_READ: p = PROT_READ; break; | |
| 3075 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; | |
| 3076 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; | |
| 3077 default: | |
| 3078 ShouldNotReachHere(); | |
| 3079 } | |
| 3080 // is_committed is unused. | |
| 3081 return bsd_mprotect(addr, bytes, p); | |
| 3082 } | |
| 3083 | |
| 3084 bool os::guard_memory(char* addr, size_t size) { | |
| 3085 return bsd_mprotect(addr, size, PROT_NONE); | |
| 3086 } | |
| 3087 | |
| 3088 bool os::unguard_memory(char* addr, size_t size) { | |
| 3089 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE); | |
| 3090 } | |
| 3091 | |
| 3092 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) { | |
| 3093 bool result = false; | |
| 3094 #ifndef _ALLBSD_SOURCE | |
| 3095 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE, | |
| 3096 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB, | |
| 3097 -1, 0); | |
| 3098 | |
| 3099 if (p != (void *) -1) { | |
| 3100 // We don't know if this really is a huge page or not. | |
| 3101 FILE *fp = fopen("/proc/self/maps", "r"); | |
| 3102 if (fp) { | |
| 3103 while (!feof(fp)) { | |
| 3104 char chars[257]; | |
| 3105 long x = 0; | |
| 3106 if (fgets(chars, sizeof(chars), fp)) { | |
| 3107 if (sscanf(chars, "%lx-%*x", &x) == 1 | |
| 3108 && x == (long)p) { | |
| 3109 if (strstr (chars, "hugepage")) { | |
| 3110 result = true; | |
| 3111 break; | |
| 3112 } | |
| 3113 } | |
| 3114 } | |
| 3115 } | |
| 3116 fclose(fp); | |
| 3117 } | |
| 3118 munmap (p, page_size); | |
| 3119 if (result) | |
| 3120 return true; | |
| 3121 } | |
| 3122 | |
| 3123 if (warn) { | |
| 3124 warning("HugeTLBFS is not supported by the operating system."); | |
| 3125 } | |
| 3126 #endif | |
| 3127 | |
| 3128 return result; | |
| 3129 } | |
| 3130 | |
| 3131 /* | |
| 3132 * Set the coredump_filter bits to include largepages in core dump (bit 6) | |
| 3133 * | |
| 3134 * From the coredump_filter documentation: | |
| 3135 * | |
| 3136 * - (bit 0) anonymous private memory | |
| 3137 * - (bit 1) anonymous shared memory | |
| 3138 * - (bit 2) file-backed private memory | |
| 3139 * - (bit 3) file-backed shared memory | |
| 3140 * - (bit 4) ELF header pages in file-backed private memory areas (it is | |
| 3141 * effective only if the bit 2 is cleared) | |
| 3142 * - (bit 5) hugetlb private memory | |
| 3143 * - (bit 6) hugetlb shared memory | |
| 3144 */ | |
| 3145 static void set_coredump_filter(void) { | |
| 3146 FILE *f; | |
| 3147 long cdm; | |
| 3148 | |
| 3149 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) { | |
| 3150 return; | |
| 3151 } | |
| 3152 | |
| 3153 if (fscanf(f, "%lx", &cdm) != 1) { | |
| 3154 fclose(f); | |
| 3155 return; | |
| 3156 } | |
| 3157 | |
| 3158 rewind(f); | |
| 3159 | |
| 3160 if ((cdm & LARGEPAGES_BIT) == 0) { | |
| 3161 cdm |= LARGEPAGES_BIT; | |
| 3162 fprintf(f, "%#lx", cdm); | |
| 3163 } | |
| 3164 | |
| 3165 fclose(f); | |
| 3166 } | |
| 3167 | |
| 3168 // Large page support | |
| 3169 | |
| 3170 static size_t _large_page_size = 0; | |
| 3171 | |
| 3172 void os::large_page_init() { | |
| 3173 #ifndef _ALLBSD_SOURCE | |
| 3174 if (!UseLargePages) { | |
| 3175 UseHugeTLBFS = false; | |
| 3176 UseSHM = false; | |
| 3177 return; | |
| 3178 } | |
| 3179 | |
| 3180 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) { | |
| 3181 // If UseLargePages is specified on the command line try both methods, | |
| 3182 // if it's default, then try only HugeTLBFS. | |
| 3183 if (FLAG_IS_DEFAULT(UseLargePages)) { | |
| 3184 UseHugeTLBFS = true; | |
| 3185 } else { | |
| 3186 UseHugeTLBFS = UseSHM = true; | |
| 3187 } | |
| 3188 } | |
| 3189 | |
| 3190 if (LargePageSizeInBytes) { | |
| 3191 _large_page_size = LargePageSizeInBytes; | |
| 3192 } else { | |
| 3193 // large_page_size on Bsd is used to round up heap size. x86 uses either | |
| 3194 // 2M or 4M page, depending on whether PAE (Physical Address Extensions) | |
| 3195 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use | |
| 3196 // page as large as 256M. | |
| 3197 // | |
| 3198 // Here we try to figure out page size by parsing /proc/meminfo and looking | |
| 3199 // for a line with the following format: | |
| 3200 // Hugepagesize: 2048 kB | |
| 3201 // | |
| 3202 // If we can't determine the value (e.g. /proc is not mounted, or the text | |
| 3203 // format has been changed), we'll use the largest page size supported by | |
| 3204 // the processor. | |
| 3205 | |
| 3206 #ifndef ZERO | |
| 3207 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M) | |
| 3208 ARM_ONLY(2 * M) PPC_ONLY(4 * M); | |
| 3209 #endif // ZERO | |
| 3210 | |
| 3211 FILE *fp = fopen("/proc/meminfo", "r"); | |
| 3212 if (fp) { | |
| 3213 while (!feof(fp)) { | |
| 3214 int x = 0; | |
| 3215 char buf[16]; | |
| 3216 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) { | |
| 3217 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) { | |
| 3218 _large_page_size = x * K; | |
| 3219 break; | |
| 3220 } | |
| 3221 } else { | |
| 3222 // skip to next line | |
| 3223 for (;;) { | |
| 3224 int ch = fgetc(fp); | |
| 3225 if (ch == EOF || ch == (int)'\n') break; | |
| 3226 } | |
| 3227 } | |
| 3228 } | |
| 3229 fclose(fp); | |
| 3230 } | |
| 3231 } | |
| 3232 | |
| 3233 // print a warning if any large page related flag is specified on command line | |
| 3234 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS); | |
| 3235 | |
| 3236 const size_t default_page_size = (size_t)Bsd::page_size(); | |
| 3237 if (_large_page_size > default_page_size) { | |
| 3238 _page_sizes[0] = _large_page_size; | |
| 3239 _page_sizes[1] = default_page_size; | |
| 3240 _page_sizes[2] = 0; | |
| 3241 } | |
| 3242 UseHugeTLBFS = UseHugeTLBFS && | |
| 3243 Bsd::hugetlbfs_sanity_check(warn_on_failure, _large_page_size); | |
| 3244 | |
| 3245 if (UseHugeTLBFS) | |
| 3246 UseSHM = false; | |
| 3247 | |
| 3248 UseLargePages = UseHugeTLBFS || UseSHM; | |
| 3249 | |
| 3250 set_coredump_filter(); | |
| 3251 #endif | |
| 3252 } | |
| 3253 | |
| 3254 #ifndef _ALLBSD_SOURCE | |
| 3255 #ifndef SHM_HUGETLB | |
| 3256 #define SHM_HUGETLB 04000 | |
| 3257 #endif | |
| 3258 #endif | |
| 3259 | |
| 3260 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) { | |
| 3261 // "exec" is passed in but not used. Creating the shared image for | |
| 3262 // the code cache doesn't have an SHM_X executable permission to check. | |
| 3263 assert(UseLargePages && UseSHM, "only for SHM large pages"); | |
| 3264 | |
| 3265 key_t key = IPC_PRIVATE; | |
| 3266 char *addr; | |
| 3267 | |
| 3268 bool warn_on_failure = UseLargePages && | |
| 3269 (!FLAG_IS_DEFAULT(UseLargePages) || | |
| 3270 !FLAG_IS_DEFAULT(LargePageSizeInBytes) | |
| 3271 ); | |
| 3272 char msg[128]; | |
| 3273 | |
| 3274 // Create a large shared memory region to attach to based on size. | |
| 3275 // Currently, size is the total size of the heap | |
| 3276 #ifndef _ALLBSD_SOURCE | |
| 3277 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W); | |
| 3278 #else | |
| 3279 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W); | |
| 3280 #endif | |
| 3281 if (shmid == -1) { | |
| 3282 // Possible reasons for shmget failure: | |
| 3283 // 1. shmmax is too small for Java heap. | |
| 3284 // > check shmmax value: cat /proc/sys/kernel/shmmax | |
| 3285 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax | |
| 3286 // 2. not enough large page memory. | |
| 3287 // > check available large pages: cat /proc/meminfo | |
| 3288 // > increase amount of large pages: | |
| 3289 // echo new_value > /proc/sys/vm/nr_hugepages | |
| 3290 // Note 1: different Bsd may use different name for this property, | |
| 3291 // e.g. on Redhat AS-3 it is "hugetlb_pool". | |
| 3292 // Note 2: it's possible there's enough physical memory available but | |
| 3293 // they are so fragmented after a long run that they can't | |
| 3294 // coalesce into large pages. Try to reserve large pages when | |
| 3295 // the system is still "fresh". | |
| 3296 if (warn_on_failure) { | |
| 3297 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); | |
| 3298 warning(msg); | |
| 3299 } | |
| 3300 return NULL; | |
| 3301 } | |
| 3302 | |
| 3303 // attach to the region | |
| 3304 addr = (char*)shmat(shmid, req_addr, 0); | |
| 3305 int err = errno; | |
| 3306 | |
| 3307 // Remove shmid. If shmat() is successful, the actual shared memory segment | |
| 3308 // will be deleted when it's detached by shmdt() or when the process | |
| 3309 // terminates. If shmat() is not successful this will remove the shared | |
| 3310 // segment immediately. | |
| 3311 shmctl(shmid, IPC_RMID, NULL); | |
| 3312 | |
| 3313 if ((intptr_t)addr == -1) { | |
| 3314 if (warn_on_failure) { | |
| 3315 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); | |
| 3316 warning(msg); | |
| 3317 } | |
| 3318 return NULL; | |
| 3319 } | |
| 3320 | |
| 3321 return addr; | |
| 3322 } | |
| 3323 | |
| 3324 bool os::release_memory_special(char* base, size_t bytes) { | |
| 3325 // detaching the SHM segment will also delete it, see reserve_memory_special() | |
| 3326 int rslt = shmdt(base); | |
| 3327 return rslt == 0; | |
| 3328 } | |
| 3329 | |
| 3330 size_t os::large_page_size() { | |
| 3331 return _large_page_size; | |
| 3332 } | |
| 3333 | |
| 3334 // HugeTLBFS allows application to commit large page memory on demand; | |
| 3335 // with SysV SHM the entire memory region must be allocated as shared | |
| 3336 // memory. | |
| 3337 bool os::can_commit_large_page_memory() { | |
| 3338 return UseHugeTLBFS; | |
| 3339 } | |
| 3340 | |
| 3341 bool os::can_execute_large_page_memory() { | |
| 3342 return UseHugeTLBFS; | |
| 3343 } | |
| 3344 | |
| 3345 // Reserve memory at an arbitrary address, only if that area is | |
| 3346 // available (and not reserved for something else). | |
| 3347 | |
| 6197 | 3348 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { |
| 3960 | 3349 const int max_tries = 10; |
| 3350 char* base[max_tries]; | |
| 3351 size_t size[max_tries]; | |
| 3352 const size_t gap = 0x000000; | |
| 3353 | |
| 3354 // Assert only that the size is a multiple of the page size, since | |
| 3355 // that's all that mmap requires, and since that's all we really know | |
| 3356 // about at this low abstraction level. If we need higher alignment, | |
| 3357 // we can either pass an alignment to this method or verify alignment | |
| 3358 // in one of the methods further up the call chain. See bug 5044738. | |
| 3359 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); | |
| 3360 | |
| 3361 // Repeatedly allocate blocks until the block is allocated at the | |
| 3362 // right spot. Give up after max_tries. Note that reserve_memory() will | |
| 3363 // automatically update _highest_vm_reserved_address if the call is | |
| 3364 // successful. The variable tracks the highest memory address every reserved | |
| 3365 // by JVM. It is used to detect heap-stack collision if running with | |
| 3366 // fixed-stack BsdThreads. Because here we may attempt to reserve more | |
| 3367 // space than needed, it could confuse the collision detecting code. To | |
| 3368 // solve the problem, save current _highest_vm_reserved_address and | |
| 3369 // calculate the correct value before return. | |
| 3370 address old_highest = _highest_vm_reserved_address; | |
| 3371 | |
| 3372 // Bsd mmap allows caller to pass an address as hint; give it a try first, | |
| 3373 // if kernel honors the hint then we can return immediately. | |
| 3374 char * addr = anon_mmap(requested_addr, bytes, false); | |
| 3375 if (addr == requested_addr) { | |
| 3376 return requested_addr; | |
| 3377 } | |
| 3378 | |
| 3379 if (addr != NULL) { | |
| 3380 // mmap() is successful but it fails to reserve at the requested address | |
| 3381 anon_munmap(addr, bytes); | |
| 3382 } | |
| 3383 | |
| 3384 int i; | |
| 3385 for (i = 0; i < max_tries; ++i) { | |
| 3386 base[i] = reserve_memory(bytes); | |
| 3387 | |
| 3388 if (base[i] != NULL) { | |
| 3389 // Is this the block we wanted? | |
| 3390 if (base[i] == requested_addr) { | |
| 3391 size[i] = bytes; | |
| 3392 break; | |
| 3393 } | |
| 3394 | |
| 3395 // Does this overlap the block we wanted? Give back the overlapped | |
| 3396 // parts and try again. | |
| 3397 | |
| 3398 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; | |
| 3399 if (top_overlap >= 0 && top_overlap < bytes) { | |
| 3400 unmap_memory(base[i], top_overlap); | |
| 3401 base[i] += top_overlap; | |
| 3402 size[i] = bytes - top_overlap; | |
| 3403 } else { | |
| 3404 size_t bottom_overlap = base[i] + bytes - requested_addr; | |
| 3405 if (bottom_overlap >= 0 && bottom_overlap < bytes) { | |
| 3406 unmap_memory(requested_addr, bottom_overlap); | |
| 3407 size[i] = bytes - bottom_overlap; | |
| 3408 } else { | |
| 3409 size[i] = bytes; | |
| 3410 } | |
| 3411 } | |
| 3412 } | |
| 3413 } | |
| 3414 | |
| 3415 // Give back the unused reserved pieces. | |
| 3416 | |
| 3417 for (int j = 0; j < i; ++j) { | |
| 3418 if (base[j] != NULL) { | |
| 3419 unmap_memory(base[j], size[j]); | |
| 3420 } | |
| 3421 } | |
| 3422 | |
| 3423 if (i < max_tries) { | |
| 3424 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes); | |
| 3425 return requested_addr; | |
| 3426 } else { | |
| 3427 _highest_vm_reserved_address = old_highest; | |
| 3428 return NULL; | |
| 3429 } | |
| 3430 } | |
| 3431 | |
| 3432 size_t os::read(int fd, void *buf, unsigned int nBytes) { | |
| 3433 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes)); | |
| 3434 } | |
| 3435 | |
| 3436 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation. | |
| 3437 // Solaris uses poll(), bsd uses park(). | |
| 3438 // Poll() is likely a better choice, assuming that Thread.interrupt() | |
| 3439 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with | |
| 3440 // SIGSEGV, see 4355769. | |
| 3441 | |
| 3442 int os::sleep(Thread* thread, jlong millis, bool interruptible) { | |
| 3443 assert(thread == Thread::current(), "thread consistency check"); | |
| 3444 | |
| 3445 ParkEvent * const slp = thread->_SleepEvent ; | |
| 3446 slp->reset() ; | |
| 3447 OrderAccess::fence() ; | |
| 3448 | |
| 3449 if (interruptible) { | |
| 3450 jlong prevtime = javaTimeNanos(); | |
| 3451 | |
| 3452 for (;;) { | |
| 3453 if (os::is_interrupted(thread, true)) { | |
| 3454 return OS_INTRPT; | |
| 3455 } | |
| 3456 | |
| 3457 jlong newtime = javaTimeNanos(); | |
| 3458 | |
| 3459 if (newtime - prevtime < 0) { | |
| 3460 // time moving backwards, should only happen if no monotonic clock | |
| 3461 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 3462 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 3463 } else { | |
|
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|
3464 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 3465 } |
| 3466 | |
| 3467 if(millis <= 0) { | |
| 3468 return OS_OK; | |
| 3469 } | |
| 3470 | |
| 3471 prevtime = newtime; | |
| 3472 | |
| 3473 { | |
| 3474 assert(thread->is_Java_thread(), "sanity check"); | |
| 3475 JavaThread *jt = (JavaThread *) thread; | |
| 3476 ThreadBlockInVM tbivm(jt); | |
| 3477 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); | |
| 3478 | |
| 3479 jt->set_suspend_equivalent(); | |
| 3480 // cleared by handle_special_suspend_equivalent_condition() or | |
| 3481 // java_suspend_self() via check_and_wait_while_suspended() | |
| 3482 | |
| 3483 slp->park(millis); | |
| 3484 | |
| 3485 // were we externally suspended while we were waiting? | |
| 3486 jt->check_and_wait_while_suspended(); | |
| 3487 } | |
| 3488 } | |
| 3489 } else { | |
| 3490 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 3491 jlong prevtime = javaTimeNanos(); | |
| 3492 | |
| 3493 for (;;) { | |
| 3494 // It'd be nice to avoid the back-to-back javaTimeNanos() calls on | |
| 3495 // the 1st iteration ... | |
| 3496 jlong newtime = javaTimeNanos(); | |
| 3497 | |
| 3498 if (newtime - prevtime < 0) { | |
| 3499 // time moving backwards, should only happen if no monotonic clock | |
| 3500 // not a guarantee() because JVM should not abort on kernel/glibc bugs | |
| 3501 assert(!Bsd::supports_monotonic_clock(), "time moving backwards"); | |
| 3502 } else { | |
|
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|
3503 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
| 3960 | 3504 } |
| 3505 | |
| 3506 if(millis <= 0) break ; | |
| 3507 | |
| 3508 prevtime = newtime; | |
| 3509 slp->park(millis); | |
| 3510 } | |
| 3511 return OS_OK ; | |
| 3512 } | |
| 3513 } | |
| 3514 | |
| 3515 int os::naked_sleep() { | |
| 3516 // %% make the sleep time an integer flag. for now use 1 millisec. | |
| 3517 return os::sleep(Thread::current(), 1, false); | |
| 3518 } | |
| 3519 | |
| 3520 // Sleep forever; naked call to OS-specific sleep; use with CAUTION | |
| 3521 void os::infinite_sleep() { | |
| 3522 while (true) { // sleep forever ... | |
| 3523 ::sleep(100); // ... 100 seconds at a time | |
| 3524 } | |
| 3525 } | |
| 3526 | |
| 3527 // Used to convert frequent JVM_Yield() to nops | |
| 3528 bool os::dont_yield() { | |
| 3529 return DontYieldALot; | |
| 3530 } | |
| 3531 | |
| 3532 void os::yield() { | |
| 3533 sched_yield(); | |
| 3534 } | |
| 3535 | |
| 3536 os::YieldResult os::NakedYield() { sched_yield(); return os::YIELD_UNKNOWN ;} | |
| 3537 | |
| 3538 void os::yield_all(int attempts) { | |
| 3539 // Yields to all threads, including threads with lower priorities | |
| 3540 // Threads on Bsd are all with same priority. The Solaris style | |
| 3541 // os::yield_all() with nanosleep(1ms) is not necessary. | |
| 3542 sched_yield(); | |
| 3543 } | |
| 3544 | |
| 3545 // Called from the tight loops to possibly influence time-sharing heuristics | |
| 3546 void os::loop_breaker(int attempts) { | |
| 3547 os::yield_all(attempts); | |
| 3548 } | |
| 3549 | |
| 3550 //////////////////////////////////////////////////////////////////////////////// | |
| 3551 // thread priority support | |
| 3552 | |
| 3553 // Note: Normal Bsd applications are run with SCHED_OTHER policy. SCHED_OTHER | |
| 3554 // only supports dynamic priority, static priority must be zero. For real-time | |
| 3555 // applications, Bsd supports SCHED_RR which allows static priority (1-99). | |
| 3556 // However, for large multi-threaded applications, SCHED_RR is not only slower | |
| 3557 // than SCHED_OTHER, but also very unstable (my volano tests hang hard 4 out | |
| 3558 // of 5 runs - Sep 2005). | |
| 3559 // | |
| 3560 // The following code actually changes the niceness of kernel-thread/LWP. It | |
| 3561 // has an assumption that setpriority() only modifies one kernel-thread/LWP, | |
| 3562 // not the entire user process, and user level threads are 1:1 mapped to kernel | |
| 3563 // threads. It has always been the case, but could change in the future. For | |
| 3564 // this reason, the code should not be used as default (ThreadPriorityPolicy=0). | |
| 3565 // It is only used when ThreadPriorityPolicy=1 and requires root privilege. | |
| 3566 | |
| 3567 #if defined(_ALLBSD_SOURCE) && !defined(__APPLE__) | |
|
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|
3568 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 3569 19, // 0 Entry should never be used |
| 3570 | |
| 3571 0, // 1 MinPriority | |
| 3572 3, // 2 | |
| 3573 6, // 3 | |
| 3574 | |
|
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|
3575 10, // 4 |
|
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3576 15, // 5 NormPriority |
|
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3577 18, // 6 |
|
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|
3578 |
|
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|
3579 21, // 7 |
|
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|
3580 25, // 8 |
|
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|
3581 28, // 9 NearMaxPriority |
|
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|
3582 |
|
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|
3583 31, // 10 MaxPriority |
|
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|
3584 |
|
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|
3585 31 // 11 CriticalPriority |
| 3960 | 3586 }; |
| 3587 #elif defined(__APPLE__) | |
| 3588 /* Using Mach high-level priority assignments */ | |
|
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|
3589 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 3590 0, // 0 Entry should never be used (MINPRI_USER) |
| 3591 | |
| 3592 27, // 1 MinPriority | |
| 3593 28, // 2 | |
| 3594 29, // 3 | |
| 3595 | |
| 3596 30, // 4 | |
| 3597 31, // 5 NormPriority (BASEPRI_DEFAULT) | |
| 3598 32, // 6 | |
| 3599 | |
| 3600 33, // 7 | |
| 3601 34, // 8 | |
| 3602 35, // 9 NearMaxPriority | |
| 3603 | |
|
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|
3604 36, // 10 MaxPriority |
|
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|
3605 |
|
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|
3606 36 // 11 CriticalPriority |
| 3960 | 3607 }; |
| 3608 #else | |
|
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|
3609 int os::java_to_os_priority[CriticalPriority + 1] = { |
| 3960 | 3610 19, // 0 Entry should never be used |
| 3611 | |
| 3612 4, // 1 MinPriority | |
| 3613 3, // 2 | |
| 3614 2, // 3 | |
| 3615 | |
| 3616 1, // 4 | |
| 3617 0, // 5 NormPriority | |
| 3618 -1, // 6 | |
| 3619 | |
| 3620 -2, // 7 | |
| 3621 -3, // 8 | |
| 3622 -4, // 9 NearMaxPriority | |
| 3623 | |
|
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|
3624 -5, // 10 MaxPriority |
|
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|
3625 |
|
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|
3626 -5 // 11 CriticalPriority |
| 3960 | 3627 }; |
| 3628 #endif | |
| 3629 | |
| 3630 static int prio_init() { | |
| 3631 if (ThreadPriorityPolicy == 1) { | |
| 3632 // Only root can raise thread priority. Don't allow ThreadPriorityPolicy=1 | |
| 3633 // if effective uid is not root. Perhaps, a more elegant way of doing | |
| 3634 // this is to test CAP_SYS_NICE capability, but that will require libcap.so | |
| 3635 if (geteuid() != 0) { | |
| 3636 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) { | |
| 3637 warning("-XX:ThreadPriorityPolicy requires root privilege on Bsd"); | |
| 3638 } | |
| 3639 ThreadPriorityPolicy = 0; | |
| 3640 } | |
| 3641 } | |
|
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|
3642 if (UseCriticalJavaThreadPriority) { |
|
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|
3643 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; |
|
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|
3644 } |
| 3960 | 3645 return 0; |
| 3646 } | |
| 3647 | |
| 3648 OSReturn os::set_native_priority(Thread* thread, int newpri) { | |
| 3649 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) return OS_OK; | |
| 3650 | |
| 3651 #ifdef __OpenBSD__ | |
| 3652 // OpenBSD pthread_setprio starves low priority threads | |
| 3653 return OS_OK; | |
| 3654 #elif defined(__FreeBSD__) | |
| 3655 int ret = pthread_setprio(thread->osthread()->pthread_id(), newpri); | |
| 3656 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 3657 struct sched_param sp; | |
| 3658 int policy; | |
| 3659 pthread_t self = pthread_self(); | |
| 3660 | |
| 3661 if (pthread_getschedparam(self, &policy, &sp) != 0) | |
| 3662 return OS_ERR; | |
| 3663 | |
| 3664 sp.sched_priority = newpri; | |
| 3665 if (pthread_setschedparam(self, policy, &sp) != 0) | |
| 3666 return OS_ERR; | |
| 3667 | |
| 3668 return OS_OK; | |
| 3669 #else | |
| 3670 int ret = setpriority(PRIO_PROCESS, thread->osthread()->thread_id(), newpri); | |
| 3671 return (ret == 0) ? OS_OK : OS_ERR; | |
| 3672 #endif | |
| 3673 } | |
| 3674 | |
| 3675 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { | |
| 3676 if ( !UseThreadPriorities || ThreadPriorityPolicy == 0 ) { | |
| 3677 *priority_ptr = java_to_os_priority[NormPriority]; | |
| 3678 return OS_OK; | |
| 3679 } | |
| 3680 | |
| 3681 errno = 0; | |
| 3682 #if defined(__OpenBSD__) || defined(__FreeBSD__) | |
| 3683 *priority_ptr = pthread_getprio(thread->osthread()->pthread_id()); | |
| 3684 #elif defined(__APPLE__) || defined(__NetBSD__) | |
| 3685 int policy; | |
| 3686 struct sched_param sp; | |
| 3687 | |
| 3688 pthread_getschedparam(pthread_self(), &policy, &sp); | |
| 3689 *priority_ptr = sp.sched_priority; | |
| 3690 #else | |
| 3691 *priority_ptr = getpriority(PRIO_PROCESS, thread->osthread()->thread_id()); | |
| 3692 #endif | |
| 3693 return (*priority_ptr != -1 || errno == 0 ? OS_OK : OS_ERR); | |
| 3694 } | |
| 3695 | |
| 3696 // Hint to the underlying OS that a task switch would not be good. | |
| 3697 // Void return because it's a hint and can fail. | |
| 3698 void os::hint_no_preempt() {} | |
| 3699 | |
| 3700 //////////////////////////////////////////////////////////////////////////////// | |
| 3701 // suspend/resume support | |
| 3702 | |
| 3703 // the low-level signal-based suspend/resume support is a remnant from the | |
| 3704 // old VM-suspension that used to be for java-suspension, safepoints etc, | |
| 3705 // within hotspot. Now there is a single use-case for this: | |
| 3706 // - calling get_thread_pc() on the VMThread by the flat-profiler task | |
| 3707 // that runs in the watcher thread. | |
| 3708 // The remaining code is greatly simplified from the more general suspension | |
| 3709 // code that used to be used. | |
| 3710 // | |
| 3711 // The protocol is quite simple: | |
| 3712 // - suspend: | |
| 3713 // - sends a signal to the target thread | |
| 3714 // - polls the suspend state of the osthread using a yield loop | |
| 3715 // - target thread signal handler (SR_handler) sets suspend state | |
| 3716 // and blocks in sigsuspend until continued | |
| 3717 // - resume: | |
| 3718 // - sets target osthread state to continue | |
| 3719 // - sends signal to end the sigsuspend loop in the SR_handler | |
| 3720 // | |
| 3721 // Note that the SR_lock plays no role in this suspend/resume protocol. | |
| 3722 // | |
| 3723 | |
| 3724 static void resume_clear_context(OSThread *osthread) { | |
| 3725 osthread->set_ucontext(NULL); | |
| 3726 osthread->set_siginfo(NULL); | |
| 3727 | |
| 3728 // notify the suspend action is completed, we have now resumed | |
| 3729 osthread->sr.clear_suspended(); | |
| 3730 } | |
| 3731 | |
| 3732 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { | |
| 3733 osthread->set_ucontext(context); | |
| 3734 osthread->set_siginfo(siginfo); | |
| 3735 } | |
| 3736 | |
| 3737 // | |
| 3738 // Handler function invoked when a thread's execution is suspended or | |
| 3739 // resumed. We have to be careful that only async-safe functions are | |
| 3740 // called here (Note: most pthread functions are not async safe and | |
| 3741 // should be avoided.) | |
| 3742 // | |
| 3743 // Note: sigwait() is a more natural fit than sigsuspend() from an | |
| 3744 // interface point of view, but sigwait() prevents the signal hander | |
| 3745 // from being run. libpthread would get very confused by not having | |
| 3746 // its signal handlers run and prevents sigwait()'s use with the | |
| 3747 // mutex granting granting signal. | |
| 3748 // | |
| 3749 // Currently only ever called on the VMThread | |
| 3750 // | |
| 3751 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { | |
| 3752 // Save and restore errno to avoid confusing native code with EINTR | |
| 3753 // after sigsuspend. | |
| 3754 int old_errno = errno; | |
| 3755 | |
| 3756 Thread* thread = Thread::current(); | |
| 3757 OSThread* osthread = thread->osthread(); | |
| 3758 assert(thread->is_VM_thread(), "Must be VMThread"); | |
| 3759 // read current suspend action | |
| 3760 int action = osthread->sr.suspend_action(); | |
| 3761 if (action == SR_SUSPEND) { | |
| 3762 suspend_save_context(osthread, siginfo, context); | |
| 3763 | |
| 3764 // Notify the suspend action is about to be completed. do_suspend() | |
| 3765 // waits until SR_SUSPENDED is set and then returns. We will wait | |
| 3766 // here for a resume signal and that completes the suspend-other | |
| 3767 // action. do_suspend/do_resume is always called as a pair from | |
| 3768 // the same thread - so there are no races | |
| 3769 | |
| 3770 // notify the caller | |
| 3771 osthread->sr.set_suspended(); | |
| 3772 | |
| 3773 sigset_t suspend_set; // signals for sigsuspend() | |
| 3774 | |
| 3775 // get current set of blocked signals and unblock resume signal | |
| 3776 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); | |
| 3777 sigdelset(&suspend_set, SR_signum); | |
| 3778 | |
| 3779 // wait here until we are resumed | |
| 3780 do { | |
| 3781 sigsuspend(&suspend_set); | |
| 3782 // ignore all returns until we get a resume signal | |
| 3783 } while (osthread->sr.suspend_action() != SR_CONTINUE); | |
| 3784 | |
| 3785 resume_clear_context(osthread); | |
| 3786 | |
| 3787 } else { | |
| 3788 assert(action == SR_CONTINUE, "unexpected sr action"); | |
| 3789 // nothing special to do - just leave the handler | |
| 3790 } | |
| 3791 | |
| 3792 errno = old_errno; | |
| 3793 } | |
| 3794 | |
| 3795 | |
| 3796 static int SR_initialize() { | |
| 3797 struct sigaction act; | |
| 3798 char *s; | |
| 3799 /* Get signal number to use for suspend/resume */ | |
| 3800 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { | |
| 3801 int sig = ::strtol(s, 0, 10); | |
| 3802 if (sig > 0 || sig < NSIG) { | |
| 3803 SR_signum = sig; | |
| 3804 } | |
| 3805 } | |
| 3806 | |
| 3807 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, | |
| 3808 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); | |
| 3809 | |
| 3810 sigemptyset(&SR_sigset); | |
| 3811 sigaddset(&SR_sigset, SR_signum); | |
| 3812 | |
| 3813 /* Set up signal handler for suspend/resume */ | |
| 3814 act.sa_flags = SA_RESTART|SA_SIGINFO; | |
| 3815 act.sa_handler = (void (*)(int)) SR_handler; | |
| 3816 | |
| 3817 // SR_signum is blocked by default. | |
| 3818 // 4528190 - We also need to block pthread restart signal (32 on all | |
| 3819 // supported Bsd platforms). Note that BsdThreads need to block | |
| 3820 // this signal for all threads to work properly. So we don't have | |
| 3821 // to use hard-coded signal number when setting up the mask. | |
| 3822 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); | |
| 3823 | |
| 3824 if (sigaction(SR_signum, &act, 0) == -1) { | |
| 3825 return -1; | |
| 3826 } | |
| 3827 | |
| 3828 // Save signal flag | |
| 3829 os::Bsd::set_our_sigflags(SR_signum, act.sa_flags); | |
| 3830 return 0; | |
| 3831 } | |
| 3832 | |
| 3833 static int SR_finalize() { | |
| 3834 return 0; | |
| 3835 } | |
| 3836 | |
| 3837 | |
| 3838 // returns true on success and false on error - really an error is fatal | |
| 3839 // but this seems the normal response to library errors | |
| 3840 static bool do_suspend(OSThread* osthread) { | |
| 3841 // mark as suspended and send signal | |
| 3842 osthread->sr.set_suspend_action(SR_SUSPEND); | |
| 3843 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 3844 assert_status(status == 0, status, "pthread_kill"); | |
| 3845 | |
| 3846 // check status and wait until notified of suspension | |
| 3847 if (status == 0) { | |
| 3848 for (int i = 0; !osthread->sr.is_suspended(); i++) { | |
| 3849 os::yield_all(i); | |
| 3850 } | |
| 3851 osthread->sr.set_suspend_action(SR_NONE); | |
| 3852 return true; | |
| 3853 } | |
| 3854 else { | |
| 3855 osthread->sr.set_suspend_action(SR_NONE); | |
| 3856 return false; | |
| 3857 } | |
| 3858 } | |
| 3859 | |
| 3860 static void do_resume(OSThread* osthread) { | |
| 3861 assert(osthread->sr.is_suspended(), "thread should be suspended"); | |
| 3862 osthread->sr.set_suspend_action(SR_CONTINUE); | |
| 3863 | |
| 3864 int status = pthread_kill(osthread->pthread_id(), SR_signum); | |
| 3865 assert_status(status == 0, status, "pthread_kill"); | |
| 3866 // check status and wait unit notified of resumption | |
| 3867 if (status == 0) { | |
| 3868 for (int i = 0; osthread->sr.is_suspended(); i++) { | |
| 3869 os::yield_all(i); | |
| 3870 } | |
| 3871 } | |
| 3872 osthread->sr.set_suspend_action(SR_NONE); | |
| 3873 } | |
| 3874 | |
| 3875 //////////////////////////////////////////////////////////////////////////////// | |
| 3876 // interrupt support | |
| 3877 | |
| 3878 void os::interrupt(Thread* thread) { | |
| 3879 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 3880 "possibility of dangling Thread pointer"); | |
| 3881 | |
| 3882 OSThread* osthread = thread->osthread(); | |
| 3883 | |
| 3884 if (!osthread->interrupted()) { | |
| 3885 osthread->set_interrupted(true); | |
| 3886 // More than one thread can get here with the same value of osthread, | |
| 3887 // resulting in multiple notifications. We do, however, want the store | |
| 3888 // to interrupted() to be visible to other threads before we execute unpark(). | |
| 3889 OrderAccess::fence(); | |
| 3890 ParkEvent * const slp = thread->_SleepEvent ; | |
| 3891 if (slp != NULL) slp->unpark() ; | |
| 3892 } | |
| 3893 | |
| 3894 // For JSR166. Unpark even if interrupt status already was set | |
| 3895 if (thread->is_Java_thread()) | |
| 3896 ((JavaThread*)thread)->parker()->unpark(); | |
| 3897 | |
| 3898 ParkEvent * ev = thread->_ParkEvent ; | |
| 3899 if (ev != NULL) ev->unpark() ; | |
| 3900 | |
| 3901 } | |
| 3902 | |
| 3903 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 3904 assert(Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 3905 "possibility of dangling Thread pointer"); | |
| 3906 | |
| 3907 OSThread* osthread = thread->osthread(); | |
| 3908 | |
| 3909 bool interrupted = osthread->interrupted(); | |
| 3910 | |
| 3911 if (interrupted && clear_interrupted) { | |
| 3912 osthread->set_interrupted(false); | |
| 3913 // consider thread->_SleepEvent->reset() ... optional optimization | |
| 3914 } | |
| 3915 | |
| 3916 return interrupted; | |
| 3917 } | |
| 3918 | |
| 3919 /////////////////////////////////////////////////////////////////////////////////// | |
| 3920 // signal handling (except suspend/resume) | |
| 3921 | |
| 3922 // This routine may be used by user applications as a "hook" to catch signals. | |
| 3923 // The user-defined signal handler must pass unrecognized signals to this | |
| 3924 // routine, and if it returns true (non-zero), then the signal handler must | |
| 3925 // return immediately. If the flag "abort_if_unrecognized" is true, then this | |
| 3926 // routine will never retun false (zero), but instead will execute a VM panic | |
| 3927 // routine kill the process. | |
| 3928 // | |
| 3929 // If this routine returns false, it is OK to call it again. This allows | |
| 3930 // the user-defined signal handler to perform checks either before or after | |
| 3931 // the VM performs its own checks. Naturally, the user code would be making | |
| 3932 // a serious error if it tried to handle an exception (such as a null check | |
| 3933 // or breakpoint) that the VM was generating for its own correct operation. | |
| 3934 // | |
| 3935 // This routine may recognize any of the following kinds of signals: | |
| 3936 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. | |
| 3937 // It should be consulted by handlers for any of those signals. | |
| 3938 // | |
| 3939 // The caller of this routine must pass in the three arguments supplied | |
| 3940 // to the function referred to in the "sa_sigaction" (not the "sa_handler") | |
| 3941 // field of the structure passed to sigaction(). This routine assumes that | |
| 3942 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. | |
| 3943 // | |
| 3944 // Note that the VM will print warnings if it detects conflicting signal | |
| 3945 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". | |
| 3946 // | |
| 3947 extern "C" JNIEXPORT int | |
| 3948 JVM_handle_bsd_signal(int signo, siginfo_t* siginfo, | |
| 3949 void* ucontext, int abort_if_unrecognized); | |
| 3950 | |
| 3951 void signalHandler(int sig, siginfo_t* info, void* uc) { | |
| 3952 assert(info != NULL && uc != NULL, "it must be old kernel"); | |
| 3953 JVM_handle_bsd_signal(sig, info, uc, true); | |
| 3954 } | |
| 3955 | |
| 3956 | |
| 3957 // This boolean allows users to forward their own non-matching signals | |
| 3958 // to JVM_handle_bsd_signal, harmlessly. | |
| 3959 bool os::Bsd::signal_handlers_are_installed = false; | |
| 3960 | |
| 3961 // For signal-chaining | |
| 3962 struct sigaction os::Bsd::sigact[MAXSIGNUM]; | |
| 3963 unsigned int os::Bsd::sigs = 0; | |
| 3964 bool os::Bsd::libjsig_is_loaded = false; | |
| 3965 typedef struct sigaction *(*get_signal_t)(int); | |
| 3966 get_signal_t os::Bsd::get_signal_action = NULL; | |
| 3967 | |
| 3968 struct sigaction* os::Bsd::get_chained_signal_action(int sig) { | |
| 3969 struct sigaction *actp = NULL; | |
| 3970 | |
| 3971 if (libjsig_is_loaded) { | |
| 3972 // Retrieve the old signal handler from libjsig | |
| 3973 actp = (*get_signal_action)(sig); | |
| 3974 } | |
| 3975 if (actp == NULL) { | |
| 3976 // Retrieve the preinstalled signal handler from jvm | |
| 3977 actp = get_preinstalled_handler(sig); | |
| 3978 } | |
| 3979 | |
| 3980 return actp; | |
| 3981 } | |
| 3982 | |
| 3983 static bool call_chained_handler(struct sigaction *actp, int sig, | |
| 3984 siginfo_t *siginfo, void *context) { | |
| 3985 // Call the old signal handler | |
| 3986 if (actp->sa_handler == SIG_DFL) { | |
| 3987 // It's more reasonable to let jvm treat it as an unexpected exception | |
| 3988 // instead of taking the default action. | |
| 3989 return false; | |
| 3990 } else if (actp->sa_handler != SIG_IGN) { | |
| 3991 if ((actp->sa_flags & SA_NODEFER) == 0) { | |
| 3992 // automaticlly block the signal | |
| 3993 sigaddset(&(actp->sa_mask), sig); | |
| 3994 } | |
| 3995 | |
| 3996 sa_handler_t hand; | |
| 3997 sa_sigaction_t sa; | |
| 3998 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; | |
| 3999 // retrieve the chained handler | |
| 4000 if (siginfo_flag_set) { | |
| 4001 sa = actp->sa_sigaction; | |
| 4002 } else { | |
| 4003 hand = actp->sa_handler; | |
| 4004 } | |
| 4005 | |
| 4006 if ((actp->sa_flags & SA_RESETHAND) != 0) { | |
| 4007 actp->sa_handler = SIG_DFL; | |
| 4008 } | |
| 4009 | |
| 4010 // try to honor the signal mask | |
| 4011 sigset_t oset; | |
| 4012 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); | |
| 4013 | |
| 4014 // call into the chained handler | |
| 4015 if (siginfo_flag_set) { | |
| 4016 (*sa)(sig, siginfo, context); | |
| 4017 } else { | |
| 4018 (*hand)(sig); | |
| 4019 } | |
| 4020 | |
| 4021 // restore the signal mask | |
| 4022 pthread_sigmask(SIG_SETMASK, &oset, 0); | |
| 4023 } | |
| 4024 // Tell jvm's signal handler the signal is taken care of. | |
| 4025 return true; | |
| 4026 } | |
| 4027 | |
| 4028 bool os::Bsd::chained_handler(int sig, siginfo_t* siginfo, void* context) { | |
| 4029 bool chained = false; | |
| 4030 // signal-chaining | |
| 4031 if (UseSignalChaining) { | |
| 4032 struct sigaction *actp = get_chained_signal_action(sig); | |
| 4033 if (actp != NULL) { | |
| 4034 chained = call_chained_handler(actp, sig, siginfo, context); | |
| 4035 } | |
| 4036 } | |
| 4037 return chained; | |
| 4038 } | |
| 4039 | |
| 4040 struct sigaction* os::Bsd::get_preinstalled_handler(int sig) { | |
| 4041 if ((( (unsigned int)1 << sig ) & sigs) != 0) { | |
| 4042 return &sigact[sig]; | |
| 4043 } | |
| 4044 return NULL; | |
| 4045 } | |
| 4046 | |
| 4047 void os::Bsd::save_preinstalled_handler(int sig, struct sigaction& oldAct) { | |
| 4048 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4049 sigact[sig] = oldAct; | |
| 4050 sigs |= (unsigned int)1 << sig; | |
| 4051 } | |
| 4052 | |
| 4053 // for diagnostic | |
| 4054 int os::Bsd::sigflags[MAXSIGNUM]; | |
| 4055 | |
| 4056 int os::Bsd::get_our_sigflags(int sig) { | |
| 4057 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4058 return sigflags[sig]; | |
| 4059 } | |
| 4060 | |
| 4061 void os::Bsd::set_our_sigflags(int sig, int flags) { | |
| 4062 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4063 sigflags[sig] = flags; | |
| 4064 } | |
| 4065 | |
| 4066 void os::Bsd::set_signal_handler(int sig, bool set_installed) { | |
| 4067 // Check for overwrite. | |
| 4068 struct sigaction oldAct; | |
| 4069 sigaction(sig, (struct sigaction*)NULL, &oldAct); | |
| 4070 | |
| 4071 void* oldhand = oldAct.sa_sigaction | |
| 4072 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 4073 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 4074 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && | |
| 4075 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && | |
| 4076 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)signalHandler)) { | |
| 4077 if (AllowUserSignalHandlers || !set_installed) { | |
| 4078 // Do not overwrite; user takes responsibility to forward to us. | |
| 4079 return; | |
| 4080 } else if (UseSignalChaining) { | |
| 4081 // save the old handler in jvm | |
| 4082 save_preinstalled_handler(sig, oldAct); | |
| 4083 // libjsig also interposes the sigaction() call below and saves the | |
| 4084 // old sigaction on it own. | |
| 4085 } else { | |
| 4086 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " | |
| 4087 "%#lx for signal %d.", (long)oldhand, sig)); | |
| 4088 } | |
| 4089 } | |
| 4090 | |
| 4091 struct sigaction sigAct; | |
| 4092 sigfillset(&(sigAct.sa_mask)); | |
| 4093 sigAct.sa_handler = SIG_DFL; | |
| 4094 if (!set_installed) { | |
| 4095 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 4096 } else { | |
| 4097 sigAct.sa_sigaction = signalHandler; | |
| 4098 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; | |
| 4099 } | |
| 4100 // Save flags, which are set by ours | |
| 4101 assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range"); | |
| 4102 sigflags[sig] = sigAct.sa_flags; | |
| 4103 | |
| 4104 int ret = sigaction(sig, &sigAct, &oldAct); | |
| 4105 assert(ret == 0, "check"); | |
| 4106 | |
| 4107 void* oldhand2 = oldAct.sa_sigaction | |
| 4108 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) | |
| 4109 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); | |
| 4110 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); | |
| 4111 } | |
| 4112 | |
| 4113 // install signal handlers for signals that HotSpot needs to | |
| 4114 // handle in order to support Java-level exception handling. | |
| 4115 | |
| 4116 void os::Bsd::install_signal_handlers() { | |
| 4117 if (!signal_handlers_are_installed) { | |
| 4118 signal_handlers_are_installed = true; | |
| 4119 | |
| 4120 // signal-chaining | |
| 4121 typedef void (*signal_setting_t)(); | |
| 4122 signal_setting_t begin_signal_setting = NULL; | |
| 4123 signal_setting_t end_signal_setting = NULL; | |
| 4124 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 4125 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); | |
| 4126 if (begin_signal_setting != NULL) { | |
| 4127 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, | |
| 4128 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); | |
| 4129 get_signal_action = CAST_TO_FN_PTR(get_signal_t, | |
| 4130 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); | |
| 4131 libjsig_is_loaded = true; | |
| 4132 assert(UseSignalChaining, "should enable signal-chaining"); | |
| 4133 } | |
| 4134 if (libjsig_is_loaded) { | |
| 4135 // Tell libjsig jvm is setting signal handlers | |
| 4136 (*begin_signal_setting)(); | |
| 4137 } | |
| 4138 | |
| 4139 set_signal_handler(SIGSEGV, true); | |
| 4140 set_signal_handler(SIGPIPE, true); | |
| 4141 set_signal_handler(SIGBUS, true); | |
| 4142 set_signal_handler(SIGILL, true); | |
| 4143 set_signal_handler(SIGFPE, true); | |
| 4144 set_signal_handler(SIGXFSZ, true); | |
| 4145 | |
| 4146 #if defined(__APPLE__) | |
| 4147 // In Mac OS X 10.4, CrashReporter will write a crash log for all 'fatal' signals, including | |
| 4148 // signals caught and handled by the JVM. To work around this, we reset the mach task | |
| 4149 // signal handler that's placed on our process by CrashReporter. This disables | |
| 4150 // CrashReporter-based reporting. | |
| 4151 // | |
| 4152 // This work-around is not necessary for 10.5+, as CrashReporter no longer intercedes | |
| 4153 // on caught fatal signals. | |
| 4154 // | |
| 4155 // Additionally, gdb installs both standard BSD signal handlers, and mach exception | |
| 4156 // handlers. By replacing the existing task exception handler, we disable gdb's mach | |
| 4157 // exception handling, while leaving the standard BSD signal handlers functional. | |
| 4158 kern_return_t kr; | |
| 4159 kr = task_set_exception_ports(mach_task_self(), | |
| 4160 EXC_MASK_BAD_ACCESS | EXC_MASK_ARITHMETIC, | |
| 4161 MACH_PORT_NULL, | |
| 4162 EXCEPTION_STATE_IDENTITY, | |
| 4163 MACHINE_THREAD_STATE); | |
| 4164 | |
| 4165 assert(kr == KERN_SUCCESS, "could not set mach task signal handler"); | |
| 4166 #endif | |
| 4167 | |
| 4168 if (libjsig_is_loaded) { | |
| 4169 // Tell libjsig jvm finishes setting signal handlers | |
| 4170 (*end_signal_setting)(); | |
| 4171 } | |
| 4172 | |
| 4173 // We don't activate signal checker if libjsig is in place, we trust ourselves | |
| 4174 // and if UserSignalHandler is installed all bets are off | |
| 4175 if (CheckJNICalls) { | |
| 4176 if (libjsig_is_loaded) { | |
| 4177 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); | |
| 4178 check_signals = false; | |
| 4179 } | |
| 4180 if (AllowUserSignalHandlers) { | |
| 4181 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); | |
| 4182 check_signals = false; | |
| 4183 } | |
| 4184 } | |
| 4185 } | |
| 4186 } | |
| 4187 | |
| 4188 #ifndef _ALLBSD_SOURCE | |
| 4189 // This is the fastest way to get thread cpu time on Bsd. | |
| 4190 // Returns cpu time (user+sys) for any thread, not only for current. | |
| 4191 // POSIX compliant clocks are implemented in the kernels 2.6.16+. | |
| 4192 // It might work on 2.6.10+ with a special kernel/glibc patch. | |
| 4193 // For reference, please, see IEEE Std 1003.1-2004: | |
| 4194 // http://www.unix.org/single_unix_specification | |
| 4195 | |
| 4196 jlong os::Bsd::fast_thread_cpu_time(clockid_t clockid) { | |
| 4197 struct timespec tp; | |
| 4198 int rc = os::Bsd::clock_gettime(clockid, &tp); | |
| 4199 assert(rc == 0, "clock_gettime is expected to return 0 code"); | |
| 4200 | |
|
4712
e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
4082
diff
changeset
|
4201 return (tp.tv_sec * NANOSECS_PER_SEC) + tp.tv_nsec; |
| 3960 | 4202 } |
| 4203 #endif | |
| 4204 | |
| 4205 ///// | |
| 4206 // glibc on Bsd platform uses non-documented flag | |
| 4207 // to indicate, that some special sort of signal | |
| 4208 // trampoline is used. | |
| 4209 // We will never set this flag, and we should | |
| 4210 // ignore this flag in our diagnostic | |
| 4211 #ifdef SIGNIFICANT_SIGNAL_MASK | |
| 4212 #undef SIGNIFICANT_SIGNAL_MASK | |
| 4213 #endif | |
| 4214 #define SIGNIFICANT_SIGNAL_MASK (~0x04000000) | |
| 4215 | |
| 4216 static const char* get_signal_handler_name(address handler, | |
| 4217 char* buf, int buflen) { | |
| 4218 int offset; | |
| 4219 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); | |
| 4220 if (found) { | |
| 4221 // skip directory names | |
| 4222 const char *p1, *p2; | |
| 4223 p1 = buf; | |
| 4224 size_t len = strlen(os::file_separator()); | |
| 4225 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; | |
| 4226 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); | |
| 4227 } else { | |
| 4228 jio_snprintf(buf, buflen, PTR_FORMAT, handler); | |
| 4229 } | |
| 4230 return buf; | |
| 4231 } | |
| 4232 | |
| 4233 static void print_signal_handler(outputStream* st, int sig, | |
| 4234 char* buf, size_t buflen) { | |
| 4235 struct sigaction sa; | |
| 4236 | |
| 4237 sigaction(sig, NULL, &sa); | |
| 4238 | |
| 4239 // See comment for SIGNIFICANT_SIGNAL_MASK define | |
| 4240 sa.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 4241 | |
| 4242 st->print("%s: ", os::exception_name(sig, buf, buflen)); | |
| 4243 | |
| 4244 address handler = (sa.sa_flags & SA_SIGINFO) | |
| 4245 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) | |
| 4246 : CAST_FROM_FN_PTR(address, sa.sa_handler); | |
| 4247 | |
| 4248 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { | |
| 4249 st->print("SIG_DFL"); | |
| 4250 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { | |
| 4251 st->print("SIG_IGN"); | |
| 4252 } else { | |
| 4253 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); | |
| 4254 } | |
| 4255 | |
| 4256 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); | |
| 4257 | |
| 4258 address rh = VMError::get_resetted_sighandler(sig); | |
| 4259 // May be, handler was resetted by VMError? | |
| 4260 if(rh != NULL) { | |
| 4261 handler = rh; | |
| 4262 sa.sa_flags = VMError::get_resetted_sigflags(sig) & SIGNIFICANT_SIGNAL_MASK; | |
| 4263 } | |
| 4264 | |
| 4265 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); | |
| 4266 | |
| 4267 // Check: is it our handler? | |
| 4268 if(handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler) || | |
| 4269 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { | |
| 4270 // It is our signal handler | |
| 4271 // check for flags, reset system-used one! | |
| 4272 if((int)sa.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 4273 st->print( | |
| 4274 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", | |
| 4275 os::Bsd::get_our_sigflags(sig)); | |
| 4276 } | |
| 4277 } | |
| 4278 st->cr(); | |
| 4279 } | |
| 4280 | |
| 4281 | |
| 4282 #define DO_SIGNAL_CHECK(sig) \ | |
| 4283 if (!sigismember(&check_signal_done, sig)) \ | |
| 4284 os::Bsd::check_signal_handler(sig) | |
| 4285 | |
| 4286 // This method is a periodic task to check for misbehaving JNI applications | |
| 4287 // under CheckJNI, we can add any periodic checks here | |
| 4288 | |
| 4289 void os::run_periodic_checks() { | |
| 4290 | |
| 4291 if (check_signals == false) return; | |
| 4292 | |
| 4293 // SEGV and BUS if overridden could potentially prevent | |
| 4294 // generation of hs*.log in the event of a crash, debugging | |
| 4295 // such a case can be very challenging, so we absolutely | |
| 4296 // check the following for a good measure: | |
| 4297 DO_SIGNAL_CHECK(SIGSEGV); | |
| 4298 DO_SIGNAL_CHECK(SIGILL); | |
| 4299 DO_SIGNAL_CHECK(SIGFPE); | |
| 4300 DO_SIGNAL_CHECK(SIGBUS); | |
| 4301 DO_SIGNAL_CHECK(SIGPIPE); | |
| 4302 DO_SIGNAL_CHECK(SIGXFSZ); | |
| 4303 | |
| 4304 | |
| 4305 // ReduceSignalUsage allows the user to override these handlers | |
| 4306 // see comments at the very top and jvm_solaris.h | |
| 4307 if (!ReduceSignalUsage) { | |
| 4308 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); | |
| 4309 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); | |
| 4310 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); | |
| 4311 DO_SIGNAL_CHECK(BREAK_SIGNAL); | |
| 4312 } | |
| 4313 | |
| 4314 DO_SIGNAL_CHECK(SR_signum); | |
| 4315 DO_SIGNAL_CHECK(INTERRUPT_SIGNAL); | |
| 4316 } | |
| 4317 | |
| 4318 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
| 4319 | |
| 4320 static os_sigaction_t os_sigaction = NULL; | |
| 4321 | |
| 4322 void os::Bsd::check_signal_handler(int sig) { | |
| 4323 char buf[O_BUFLEN]; | |
| 4324 address jvmHandler = NULL; | |
| 4325 | |
| 4326 | |
| 4327 struct sigaction act; | |
| 4328 if (os_sigaction == NULL) { | |
| 4329 // only trust the default sigaction, in case it has been interposed | |
| 4330 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); | |
| 4331 if (os_sigaction == NULL) return; | |
| 4332 } | |
| 4333 | |
| 4334 os_sigaction(sig, (struct sigaction*)NULL, &act); | |
| 4335 | |
| 4336 | |
| 4337 act.sa_flags &= SIGNIFICANT_SIGNAL_MASK; | |
| 4338 | |
| 4339 address thisHandler = (act.sa_flags & SA_SIGINFO) | |
| 4340 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) | |
| 4341 : CAST_FROM_FN_PTR(address, act.sa_handler) ; | |
| 4342 | |
| 4343 | |
| 4344 switch(sig) { | |
| 4345 case SIGSEGV: | |
| 4346 case SIGBUS: | |
| 4347 case SIGFPE: | |
| 4348 case SIGPIPE: | |
| 4349 case SIGILL: | |
| 4350 case SIGXFSZ: | |
| 4351 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)signalHandler); | |
| 4352 break; | |
| 4353 | |
| 4354 case SHUTDOWN1_SIGNAL: | |
| 4355 case SHUTDOWN2_SIGNAL: | |
| 4356 case SHUTDOWN3_SIGNAL: | |
| 4357 case BREAK_SIGNAL: | |
| 4358 jvmHandler = (address)user_handler(); | |
| 4359 break; | |
| 4360 | |
| 4361 case INTERRUPT_SIGNAL: | |
| 4362 jvmHandler = CAST_FROM_FN_PTR(address, SIG_DFL); | |
| 4363 break; | |
| 4364 | |
| 4365 default: | |
| 4366 if (sig == SR_signum) { | |
| 4367 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); | |
| 4368 } else { | |
| 4369 return; | |
| 4370 } | |
| 4371 break; | |
| 4372 } | |
| 4373 | |
| 4374 if (thisHandler != jvmHandler) { | |
| 4375 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); | |
| 4376 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); | |
| 4377 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); | |
| 4378 // No need to check this sig any longer | |
| 4379 sigaddset(&check_signal_done, sig); | |
| 4380 } else if(os::Bsd::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Bsd::get_our_sigflags(sig)) { | |
| 4381 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); | |
| 4382 tty->print("expected:" PTR32_FORMAT, os::Bsd::get_our_sigflags(sig)); | |
| 4383 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); | |
| 4384 // No need to check this sig any longer | |
| 4385 sigaddset(&check_signal_done, sig); | |
| 4386 } | |
| 4387 | |
| 4388 // Dump all the signal | |
| 4389 if (sigismember(&check_signal_done, sig)) { | |
| 4390 print_signal_handlers(tty, buf, O_BUFLEN); | |
| 4391 } | |
| 4392 } | |
| 4393 | |
| 4394 extern void report_error(char* file_name, int line_no, char* title, char* format, ...); | |
| 4395 | |
| 4396 extern bool signal_name(int signo, char* buf, size_t len); | |
| 4397 | |
| 4398 const char* os::exception_name(int exception_code, char* buf, size_t size) { | |
| 4399 if (0 < exception_code && exception_code <= SIGRTMAX) { | |
| 4400 // signal | |
| 4401 if (!signal_name(exception_code, buf, size)) { | |
| 4402 jio_snprintf(buf, size, "SIG%d", exception_code); | |
| 4403 } | |
| 4404 return buf; | |
| 4405 } else { | |
| 4406 return NULL; | |
| 4407 } | |
| 4408 } | |
| 4409 | |
| 4410 // this is called _before_ the most of global arguments have been parsed | |
| 4411 void os::init(void) { | |
| 4412 char dummy; /* used to get a guess on initial stack address */ | |
| 4413 // first_hrtime = gethrtime(); | |
| 4414 | |
| 4415 // With BsdThreads the JavaMain thread pid (primordial thread) | |
| 4416 // is different than the pid of the java launcher thread. | |
| 4417 // So, on Bsd, the launcher thread pid is passed to the VM | |
| 4418 // via the sun.java.launcher.pid property. | |
| 4419 // Use this property instead of getpid() if it was correctly passed. | |
| 4420 // See bug 6351349. | |
| 4421 pid_t java_launcher_pid = (pid_t) Arguments::sun_java_launcher_pid(); | |
| 4422 | |
| 4423 _initial_pid = (java_launcher_pid > 0) ? java_launcher_pid : getpid(); | |
| 4424 | |
| 4425 clock_tics_per_sec = CLK_TCK; | |
| 4426 | |
| 4427 init_random(1234567); | |
| 4428 | |
| 4429 ThreadCritical::initialize(); | |
| 4430 | |
| 4431 Bsd::set_page_size(getpagesize()); | |
| 4432 if (Bsd::page_size() == -1) { | |
| 4433 fatal(err_msg("os_bsd.cpp: os::init: sysconf failed (%s)", | |
| 4434 strerror(errno))); | |
| 4435 } | |
| 4436 init_page_sizes((size_t) Bsd::page_size()); | |
| 4437 | |
| 4438 Bsd::initialize_system_info(); | |
| 4439 | |
| 4440 // main_thread points to the aboriginal thread | |
| 4441 Bsd::_main_thread = pthread_self(); | |
| 4442 | |
| 4443 Bsd::clock_init(); | |
| 4444 initial_time_count = os::elapsed_counter(); | |
| 4445 | |
| 4446 #ifdef __APPLE__ | |
| 4447 // XXXDARWIN | |
| 4448 // Work around the unaligned VM callbacks in hotspot's | |
| 4449 // sharedRuntime. The callbacks don't use SSE2 instructions, and work on | |
| 4450 // Linux, Solaris, and FreeBSD. On Mac OS X, dyld (rightly so) enforces | |
| 4451 // alignment when doing symbol lookup. To work around this, we force early | |
| 4452 // binding of all symbols now, thus binding when alignment is known-good. | |
| 4453 _dyld_bind_fully_image_containing_address((const void *) &os::init); | |
| 4454 #endif | |
| 4455 } | |
| 4456 | |
| 4457 // To install functions for atexit system call | |
| 4458 extern "C" { | |
| 4459 static void perfMemory_exit_helper() { | |
| 4460 perfMemory_exit(); | |
| 4461 } | |
| 4462 } | |
| 4463 | |
| 4464 // this is called _after_ the global arguments have been parsed | |
| 4465 jint os::init_2(void) | |
| 4466 { | |
| 4467 #ifndef _ALLBSD_SOURCE | |
| 4468 Bsd::fast_thread_clock_init(); | |
| 4469 #endif | |
| 4470 | |
| 4471 // Allocate a single page and mark it as readable for safepoint polling | |
| 4472 address polling_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 4473 guarantee( polling_page != MAP_FAILED, "os::init_2: failed to allocate polling page" ); | |
| 4474 | |
| 4475 os::set_polling_page( polling_page ); | |
| 4476 | |
| 4477 #ifndef PRODUCT | |
| 4478 if(Verbose && PrintMiscellaneous) | |
| 4479 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); | |
| 4480 #endif | |
| 4481 | |
| 4482 if (!UseMembar) { | |
| 4483 address mem_serialize_page = (address) ::mmap(NULL, Bsd::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); | |
| 4484 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); | |
| 4485 os::set_memory_serialize_page( mem_serialize_page ); | |
| 4486 | |
| 4487 #ifndef PRODUCT | |
| 4488 if(Verbose && PrintMiscellaneous) | |
| 4489 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); | |
| 4490 #endif | |
| 4491 } | |
| 4492 | |
| 4493 os::large_page_init(); | |
| 4494 | |
| 4495 // initialize suspend/resume support - must do this before signal_sets_init() | |
| 4496 if (SR_initialize() != 0) { | |
| 4497 perror("SR_initialize failed"); | |
| 4498 return JNI_ERR; | |
| 4499 } | |
| 4500 | |
| 4501 Bsd::signal_sets_init(); | |
| 4502 Bsd::install_signal_handlers(); | |
| 4503 | |
| 4504 // Check minimum allowable stack size for thread creation and to initialize | |
| 4505 // the java system classes, including StackOverflowError - depends on page | |
| 4506 // size. Add a page for compiler2 recursion in main thread. | |
| 4507 // Add in 2*BytesPerWord times page size to account for VM stack during | |
| 4508 // class initialization depending on 32 or 64 bit VM. | |
| 4509 os::Bsd::min_stack_allowed = MAX2(os::Bsd::min_stack_allowed, | |
| 4510 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ | |
| 4511 2*BytesPerWord COMPILER2_PRESENT(+1)) * Bsd::page_size()); | |
| 4512 | |
| 4513 size_t threadStackSizeInBytes = ThreadStackSize * K; | |
| 4514 if (threadStackSizeInBytes != 0 && | |
| 4515 threadStackSizeInBytes < os::Bsd::min_stack_allowed) { | |
| 4516 tty->print_cr("\nThe stack size specified is too small, " | |
| 4517 "Specify at least %dk", | |
| 4518 os::Bsd::min_stack_allowed/ K); | |
| 4519 return JNI_ERR; | |
| 4520 } | |
| 4521 | |
| 4522 // Make the stack size a multiple of the page size so that | |
| 4523 // the yellow/red zones can be guarded. | |
| 4524 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, | |
| 4525 vm_page_size())); | |
| 4526 | |
| 4527 #ifndef _ALLBSD_SOURCE | |
| 4528 Bsd::capture_initial_stack(JavaThread::stack_size_at_create()); | |
| 4529 | |
| 4530 Bsd::libpthread_init(); | |
| 4531 if (PrintMiscellaneous && (Verbose || WizardMode)) { | |
| 4532 tty->print_cr("[HotSpot is running with %s, %s(%s)]\n", | |
| 4533 Bsd::glibc_version(), Bsd::libpthread_version(), | |
| 4534 Bsd::is_floating_stack() ? "floating stack" : "fixed stack"); | |
| 4535 } | |
| 4536 | |
| 4537 if (UseNUMA) { | |
| 4538 if (!Bsd::libnuma_init()) { | |
| 4539 UseNUMA = false; | |
| 4540 } else { | |
| 4541 if ((Bsd::numa_max_node() < 1)) { | |
| 4542 // There's only one node(they start from 0), disable NUMA. | |
| 4543 UseNUMA = false; | |
| 4544 } | |
| 4545 } | |
| 4546 // With SHM large pages we cannot uncommit a page, so there's not way | |
| 4547 // we can make the adaptive lgrp chunk resizing work. If the user specified | |
| 4548 // both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and | |
| 4549 // disable adaptive resizing. | |
| 4550 if (UseNUMA && UseLargePages && UseSHM) { | |
| 4551 if (!FLAG_IS_DEFAULT(UseNUMA)) { | |
| 4552 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) { | |
| 4553 UseLargePages = false; | |
| 4554 } else { | |
| 4555 warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing"); | |
| 4556 UseAdaptiveSizePolicy = false; | |
| 4557 UseAdaptiveNUMAChunkSizing = false; | |
| 4558 } | |
| 4559 } else { | |
| 4560 UseNUMA = false; | |
| 4561 } | |
| 4562 } | |
| 4563 if (!UseNUMA && ForceNUMA) { | |
| 4564 UseNUMA = true; | |
| 4565 } | |
| 4566 } | |
| 4567 #endif | |
| 4568 | |
| 4569 if (MaxFDLimit) { | |
| 4570 // set the number of file descriptors to max. print out error | |
| 4571 // if getrlimit/setrlimit fails but continue regardless. | |
| 4572 struct rlimit nbr_files; | |
| 4573 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 4574 if (status != 0) { | |
| 4575 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 4576 perror("os::init_2 getrlimit failed"); | |
| 4577 } else { | |
| 4578 nbr_files.rlim_cur = nbr_files.rlim_max; | |
| 4579 | |
| 4580 #ifdef __APPLE__ | |
| 4581 // Darwin returns RLIM_INFINITY for rlim_max, but fails with EINVAL if | |
| 4582 // you attempt to use RLIM_INFINITY. As per setrlimit(2), OPEN_MAX must | |
| 4583 // be used instead | |
| 4584 nbr_files.rlim_cur = MIN(OPEN_MAX, nbr_files.rlim_cur); | |
| 4585 #endif | |
| 4586 | |
| 4587 status = setrlimit(RLIMIT_NOFILE, &nbr_files); | |
| 4588 if (status != 0) { | |
| 4589 if (PrintMiscellaneous && (Verbose || WizardMode)) | |
| 4590 perror("os::init_2 setrlimit failed"); | |
| 4591 } | |
| 4592 } | |
| 4593 } | |
| 4594 | |
| 4595 #ifndef _ALLBSD_SOURCE | |
| 4596 // Initialize lock used to serialize thread creation (see os::create_thread) | |
| 4597 Bsd::set_createThread_lock(new Mutex(Mutex::leaf, "createThread_lock", false)); | |
| 4598 #endif | |
| 4599 | |
| 4600 // at-exit methods are called in the reverse order of their registration. | |
| 4601 // atexit functions are called on return from main or as a result of a | |
| 4602 // call to exit(3C). There can be only 32 of these functions registered | |
| 4603 // and atexit() does not set errno. | |
| 4604 | |
| 4605 if (PerfAllowAtExitRegistration) { | |
| 4606 // only register atexit functions if PerfAllowAtExitRegistration is set. | |
| 4607 // atexit functions can be delayed until process exit time, which | |
| 4608 // can be problematic for embedded VM situations. Embedded VMs should | |
| 4609 // call DestroyJavaVM() to assure that VM resources are released. | |
| 4610 | |
| 4611 // note: perfMemory_exit_helper atexit function may be removed in | |
| 4612 // the future if the appropriate cleanup code can be added to the | |
| 4613 // VM_Exit VMOperation's doit method. | |
| 4614 if (atexit(perfMemory_exit_helper) != 0) { | |
| 4615 warning("os::init2 atexit(perfMemory_exit_helper) failed"); | |
| 4616 } | |
| 4617 } | |
| 4618 | |
| 4619 // initialize thread priority policy | |
| 4620 prio_init(); | |
| 4621 | |
| 4006 | 4622 #ifdef __APPLE__ |
| 4623 // dynamically link to objective c gc registration | |
| 4624 void *handleLibObjc = dlopen(OBJC_LIB, RTLD_LAZY); | |
| 4625 if (handleLibObjc != NULL) { | |
| 4626 objc_registerThreadWithCollectorFunction = (objc_registerThreadWithCollector_t) dlsym(handleLibObjc, OBJC_GCREGISTER); | |
| 4627 } | |
| 4628 #endif | |
| 4629 | |
| 3960 | 4630 return JNI_OK; |
| 4631 } | |
| 4632 | |
| 4633 // this is called at the end of vm_initialization | |
| 4634 void os::init_3(void) { } | |
| 4635 | |
| 4636 // Mark the polling page as unreadable | |
| 4637 void os::make_polling_page_unreadable(void) { | |
| 4638 if( !guard_memory((char*)_polling_page, Bsd::page_size()) ) | |
| 4639 fatal("Could not disable polling page"); | |
| 4640 }; | |
| 4641 | |
| 4642 // Mark the polling page as readable | |
| 4643 void os::make_polling_page_readable(void) { | |
| 4644 if( !bsd_mprotect((char *)_polling_page, Bsd::page_size(), PROT_READ)) { | |
| 4645 fatal("Could not enable polling page"); | |
| 4646 } | |
| 4647 }; | |
| 4648 | |
| 4649 int os::active_processor_count() { | |
| 4650 #ifdef _ALLBSD_SOURCE | |
| 4651 return _processor_count; | |
| 4652 #else | |
| 4653 // Bsd doesn't yet have a (official) notion of processor sets, | |
| 4654 // so just return the number of online processors. | |
| 4655 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); | |
| 4656 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); | |
| 4657 return online_cpus; | |
| 4658 #endif | |
| 4659 } | |
| 4660 | |
| 4006 | 4661 void os::set_native_thread_name(const char *name) { |
| 4662 #if defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5 | |
| 4663 // This is only supported in Snow Leopard and beyond | |
| 4664 if (name != NULL) { | |
| 4665 // Add a "Java: " prefix to the name | |
| 4666 char buf[MAXTHREADNAMESIZE]; | |
| 4667 snprintf(buf, sizeof(buf), "Java: %s", name); | |
| 4668 pthread_setname_np(buf); | |
| 4669 } | |
| 4670 #endif | |
| 4671 } | |
| 4672 | |
| 3960 | 4673 bool os::distribute_processes(uint length, uint* distribution) { |
| 4674 // Not yet implemented. | |
| 4675 return false; | |
| 4676 } | |
| 4677 | |
| 4678 bool os::bind_to_processor(uint processor_id) { | |
| 4679 // Not yet implemented. | |
| 4680 return false; | |
| 4681 } | |
| 4682 | |
| 4683 /// | |
| 4684 | |
| 4685 // Suspends the target using the signal mechanism and then grabs the PC before | |
| 4686 // resuming the target. Used by the flat-profiler only | |
| 4687 ExtendedPC os::get_thread_pc(Thread* thread) { | |
| 4688 // Make sure that it is called by the watcher for the VMThread | |
| 4689 assert(Thread::current()->is_Watcher_thread(), "Must be watcher"); | |
| 4690 assert(thread->is_VM_thread(), "Can only be called for VMThread"); | |
| 4691 | |
| 4692 ExtendedPC epc; | |
| 4693 | |
| 4694 OSThread* osthread = thread->osthread(); | |
| 4695 if (do_suspend(osthread)) { | |
| 4696 if (osthread->ucontext() != NULL) { | |
| 4697 epc = os::Bsd::ucontext_get_pc(osthread->ucontext()); | |
| 4698 } else { | |
| 4699 // NULL context is unexpected, double-check this is the VMThread | |
| 4700 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); | |
| 4701 } | |
| 4702 do_resume(osthread); | |
| 4703 } | |
| 4704 // failure means pthread_kill failed for some reason - arguably this is | |
| 4705 // a fatal problem, but such problems are ignored elsewhere | |
| 4706 | |
| 4707 return epc; | |
| 4708 } | |
| 4709 | |
| 4710 int os::Bsd::safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime) | |
| 4711 { | |
| 4712 #ifdef _ALLBSD_SOURCE | |
| 4713 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 4714 #else | |
| 4715 if (is_NPTL()) { | |
| 4716 return pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 4717 } else { | |
| 4718 #ifndef IA64 | |
| 4719 // 6292965: BsdThreads pthread_cond_timedwait() resets FPU control | |
| 4720 // word back to default 64bit precision if condvar is signaled. Java | |
| 4721 // wants 53bit precision. Save and restore current value. | |
| 4722 int fpu = get_fpu_control_word(); | |
| 4723 #endif // IA64 | |
| 4724 int status = pthread_cond_timedwait(_cond, _mutex, _abstime); | |
| 4725 #ifndef IA64 | |
| 4726 set_fpu_control_word(fpu); | |
| 4727 #endif // IA64 | |
| 4728 return status; | |
| 4729 } | |
| 4730 #endif | |
| 4731 } | |
| 4732 | |
| 4733 //////////////////////////////////////////////////////////////////////////////// | |
| 4734 // debug support | |
| 4735 | |
| 4736 static address same_page(address x, address y) { | |
| 4737 int page_bits = -os::vm_page_size(); | |
| 4738 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) | |
| 4739 return x; | |
| 4740 else if (x > y) | |
| 4741 return (address)(intptr_t(y) | ~page_bits) + 1; | |
| 4742 else | |
| 4743 return (address)(intptr_t(y) & page_bits); | |
| 4744 } | |
| 4745 | |
| 4746 bool os::find(address addr, outputStream* st) { | |
| 4747 Dl_info dlinfo; | |
| 4748 memset(&dlinfo, 0, sizeof(dlinfo)); | |
| 4749 if (dladdr(addr, &dlinfo)) { | |
| 4750 st->print(PTR_FORMAT ": ", addr); | |
| 4751 if (dlinfo.dli_sname != NULL) { | |
| 4752 st->print("%s+%#x", dlinfo.dli_sname, | |
| 4753 addr - (intptr_t)dlinfo.dli_saddr); | |
| 4754 } else if (dlinfo.dli_fname) { | |
| 4755 st->print("<offset %#x>", addr - (intptr_t)dlinfo.dli_fbase); | |
| 4756 } else { | |
| 4757 st->print("<absolute address>"); | |
| 4758 } | |
| 4759 if (dlinfo.dli_fname) { | |
| 4760 st->print(" in %s", dlinfo.dli_fname); | |
| 4761 } | |
| 4762 if (dlinfo.dli_fbase) { | |
| 4763 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); | |
| 4764 } | |
| 4765 st->cr(); | |
| 4766 | |
| 4767 if (Verbose) { | |
| 4768 // decode some bytes around the PC | |
| 4769 address begin = same_page(addr-40, addr); | |
| 4770 address end = same_page(addr+40, addr); | |
| 4771 address lowest = (address) dlinfo.dli_sname; | |
| 4772 if (!lowest) lowest = (address) dlinfo.dli_fbase; | |
| 4773 if (begin < lowest) begin = lowest; | |
| 4774 Dl_info dlinfo2; | |
| 4775 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr | |
| 4776 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) | |
| 4777 end = (address) dlinfo2.dli_saddr; | |
| 4778 Disassembler::decode(begin, end, st); | |
| 4779 } | |
| 4780 return true; | |
| 4781 } | |
| 4782 return false; | |
| 4783 } | |
| 4784 | |
| 4785 //////////////////////////////////////////////////////////////////////////////// | |
| 4786 // misc | |
| 4787 | |
| 4788 // This does not do anything on Bsd. This is basically a hook for being | |
| 4789 // able to use structured exception handling (thread-local exception filters) | |
| 4790 // on, e.g., Win32. | |
| 4791 void | |
| 4792 os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, | |
| 4793 JavaCallArguments* args, Thread* thread) { | |
| 4794 f(value, method, args, thread); | |
| 4795 } | |
| 4796 | |
| 4797 void os::print_statistics() { | |
| 4798 } | |
| 4799 | |
| 4800 int os::message_box(const char* title, const char* message) { | |
| 4801 int i; | |
| 4802 fdStream err(defaultStream::error_fd()); | |
| 4803 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 4804 err.cr(); | |
| 4805 err.print_raw_cr(title); | |
| 4806 for (i = 0; i < 78; i++) err.print_raw("-"); | |
| 4807 err.cr(); | |
| 4808 err.print_raw_cr(message); | |
| 4809 for (i = 0; i < 78; i++) err.print_raw("="); | |
| 4810 err.cr(); | |
| 4811 | |
| 4812 char buf[16]; | |
| 4813 // Prevent process from exiting upon "read error" without consuming all CPU | |
| 4814 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } | |
| 4815 | |
| 4816 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 4817 } | |
| 4818 | |
| 4819 int os::stat(const char *path, struct stat *sbuf) { | |
| 4820 char pathbuf[MAX_PATH]; | |
| 4821 if (strlen(path) > MAX_PATH - 1) { | |
| 4822 errno = ENAMETOOLONG; | |
| 4823 return -1; | |
| 4824 } | |
| 4825 os::native_path(strcpy(pathbuf, path)); | |
| 4826 return ::stat(pathbuf, sbuf); | |
| 4827 } | |
| 4828 | |
| 4829 bool os::check_heap(bool force) { | |
| 4830 return true; | |
| 4831 } | |
| 4832 | |
| 4833 int local_vsnprintf(char* buf, size_t count, const char* format, va_list args) { | |
| 4834 return ::vsnprintf(buf, count, format, args); | |
| 4835 } | |
| 4836 | |
| 4837 // Is a (classpath) directory empty? | |
| 4838 bool os::dir_is_empty(const char* path) { | |
| 4839 DIR *dir = NULL; | |
| 4840 struct dirent *ptr; | |
| 4841 | |
| 4842 dir = opendir(path); | |
| 4843 if (dir == NULL) return true; | |
| 4844 | |
| 4845 /* Scan the directory */ | |
| 4846 bool result = true; | |
| 4847 char buf[sizeof(struct dirent) + MAX_PATH]; | |
| 4848 while (result && (ptr = ::readdir(dir)) != NULL) { | |
| 4849 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { | |
| 4850 result = false; | |
| 4851 } | |
| 4852 } | |
| 4853 closedir(dir); | |
| 4854 return result; | |
| 4855 } | |
| 4856 | |
| 4857 // This code originates from JDK's sysOpen and open64_w | |
| 4858 // from src/solaris/hpi/src/system_md.c | |
| 4859 | |
| 4860 #ifndef O_DELETE | |
| 4861 #define O_DELETE 0x10000 | |
| 4862 #endif | |
| 4863 | |
| 4864 // Open a file. Unlink the file immediately after open returns | |
| 4865 // if the specified oflag has the O_DELETE flag set. | |
| 4866 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c | |
| 4867 | |
| 4868 int os::open(const char *path, int oflag, int mode) { | |
| 4869 | |
| 4870 if (strlen(path) > MAX_PATH - 1) { | |
| 4871 errno = ENAMETOOLONG; | |
| 4872 return -1; | |
| 4873 } | |
| 4874 int fd; | |
| 4875 int o_delete = (oflag & O_DELETE); | |
| 4876 oflag = oflag & ~O_DELETE; | |
| 4877 | |
| 4878 fd = ::open(path, oflag, mode); | |
| 4879 if (fd == -1) return -1; | |
| 4880 | |
| 4881 //If the open succeeded, the file might still be a directory | |
| 4882 { | |
| 4883 struct stat buf; | |
| 4884 int ret = ::fstat(fd, &buf); | |
| 4885 int st_mode = buf.st_mode; | |
| 4886 | |
| 4887 if (ret != -1) { | |
| 4888 if ((st_mode & S_IFMT) == S_IFDIR) { | |
| 4889 errno = EISDIR; | |
| 4890 ::close(fd); | |
| 4891 return -1; | |
| 4892 } | |
| 4893 } else { | |
| 4894 ::close(fd); | |
| 4895 return -1; | |
| 4896 } | |
| 4897 } | |
| 4898 | |
| 4899 /* | |
| 4900 * All file descriptors that are opened in the JVM and not | |
| 4901 * specifically destined for a subprocess should have the | |
| 4902 * close-on-exec flag set. If we don't set it, then careless 3rd | |
| 4903 * party native code might fork and exec without closing all | |
| 4904 * appropriate file descriptors (e.g. as we do in closeDescriptors in | |
| 4905 * UNIXProcess.c), and this in turn might: | |
| 4906 * | |
| 4907 * - cause end-of-file to fail to be detected on some file | |
| 4908 * descriptors, resulting in mysterious hangs, or | |
| 4909 * | |
| 4910 * - might cause an fopen in the subprocess to fail on a system | |
| 4911 * suffering from bug 1085341. | |
| 4912 * | |
| 4913 * (Yes, the default setting of the close-on-exec flag is a Unix | |
| 4914 * design flaw) | |
| 4915 * | |
| 4916 * See: | |
| 4917 * 1085341: 32-bit stdio routines should support file descriptors >255 | |
| 4918 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed | |
| 4919 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 | |
| 4920 */ | |
| 4921 #ifdef FD_CLOEXEC | |
| 4922 { | |
| 4923 int flags = ::fcntl(fd, F_GETFD); | |
| 4924 if (flags != -1) | |
| 4925 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); | |
| 4926 } | |
| 4927 #endif | |
| 4928 | |
| 4929 if (o_delete != 0) { | |
| 4930 ::unlink(path); | |
| 4931 } | |
| 4932 return fd; | |
| 4933 } | |
| 4934 | |
| 4935 | |
| 4936 // create binary file, rewriting existing file if required | |
| 4937 int os::create_binary_file(const char* path, bool rewrite_existing) { | |
| 4938 int oflags = O_WRONLY | O_CREAT; | |
| 4939 if (!rewrite_existing) { | |
| 4940 oflags |= O_EXCL; | |
| 4941 } | |
| 4942 return ::open(path, oflags, S_IREAD | S_IWRITE); | |
| 4943 } | |
| 4944 | |
| 4945 // return current position of file pointer | |
| 4946 jlong os::current_file_offset(int fd) { | |
| 4947 return (jlong)::lseek(fd, (off_t)0, SEEK_CUR); | |
| 4948 } | |
| 4949 | |
| 4950 // move file pointer to the specified offset | |
| 4951 jlong os::seek_to_file_offset(int fd, jlong offset) { | |
| 4952 return (jlong)::lseek(fd, (off_t)offset, SEEK_SET); | |
| 4953 } | |
| 4954 | |
| 4955 // This code originates from JDK's sysAvailable | |
| 4956 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c | |
| 4957 | |
| 4958 int os::available(int fd, jlong *bytes) { | |
| 4959 jlong cur, end; | |
| 4960 int mode; | |
| 4961 struct stat buf; | |
| 4962 | |
| 4963 if (::fstat(fd, &buf) >= 0) { | |
| 4964 mode = buf.st_mode; | |
| 4965 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { | |
| 4966 /* | |
| 4967 * XXX: is the following call interruptible? If so, this might | |
| 4968 * need to go through the INTERRUPT_IO() wrapper as for other | |
| 4969 * blocking, interruptible calls in this file. | |
| 4970 */ | |
| 4971 int n; | |
| 4972 if (::ioctl(fd, FIONREAD, &n) >= 0) { | |
| 4973 *bytes = n; | |
| 4974 return 1; | |
| 4975 } | |
| 4976 } | |
| 4977 } | |
| 4978 if ((cur = ::lseek(fd, 0L, SEEK_CUR)) == -1) { | |
| 4979 return 0; | |
| 4980 } else if ((end = ::lseek(fd, 0L, SEEK_END)) == -1) { | |
| 4981 return 0; | |
| 4982 } else if (::lseek(fd, cur, SEEK_SET) == -1) { | |
| 4983 return 0; | |
| 4984 } | |
| 4985 *bytes = end - cur; | |
| 4986 return 1; | |
| 4987 } | |
| 4988 | |
| 4989 int os::socket_available(int fd, jint *pbytes) { | |
| 4990 if (fd < 0) | |
| 4991 return OS_OK; | |
| 4992 | |
| 4993 int ret; | |
| 4994 | |
| 4995 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); | |
| 4996 | |
| 4997 //%% note ioctl can return 0 when successful, JVM_SocketAvailable | |
| 4998 // is expected to return 0 on failure and 1 on success to the jdk. | |
| 4999 | |
| 5000 return (ret == OS_ERR) ? 0 : 1; | |
| 5001 } | |
| 5002 | |
| 5003 // Map a block of memory. | |
| 6197 | 5004 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 5005 char *addr, size_t bytes, bool read_only, |
| 5006 bool allow_exec) { | |
| 5007 int prot; | |
| 5008 int flags; | |
| 5009 | |
| 5010 if (read_only) { | |
| 5011 prot = PROT_READ; | |
| 5012 flags = MAP_SHARED; | |
| 5013 } else { | |
| 5014 prot = PROT_READ | PROT_WRITE; | |
| 5015 flags = MAP_PRIVATE; | |
| 5016 } | |
| 5017 | |
| 5018 if (allow_exec) { | |
| 5019 prot |= PROT_EXEC; | |
| 5020 } | |
| 5021 | |
| 5022 if (addr != NULL) { | |
| 5023 flags |= MAP_FIXED; | |
| 5024 } | |
| 5025 | |
| 5026 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, | |
| 5027 fd, file_offset); | |
| 5028 if (mapped_address == MAP_FAILED) { | |
| 5029 return NULL; | |
| 5030 } | |
| 5031 return mapped_address; | |
| 5032 } | |
| 5033 | |
| 5034 | |
| 5035 // Remap a block of memory. | |
| 6197 | 5036 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, |
| 3960 | 5037 char *addr, size_t bytes, bool read_only, |
| 5038 bool allow_exec) { | |
| 5039 // same as map_memory() on this OS | |
| 5040 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, | |
| 5041 allow_exec); | |
| 5042 } | |
| 5043 | |
| 5044 | |
| 5045 // Unmap a block of memory. | |
| 6197 | 5046 bool os::pd_unmap_memory(char* addr, size_t bytes) { |
| 3960 | 5047 return munmap(addr, bytes) == 0; |
| 5048 } | |
| 5049 | |
| 5050 #ifndef _ALLBSD_SOURCE | |
| 5051 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time); | |
| 5052 | |
| 5053 static clockid_t thread_cpu_clockid(Thread* thread) { | |
| 5054 pthread_t tid = thread->osthread()->pthread_id(); | |
| 5055 clockid_t clockid; | |
| 5056 | |
| 5057 // Get thread clockid | |
| 5058 int rc = os::Bsd::pthread_getcpuclockid(tid, &clockid); | |
| 5059 assert(rc == 0, "pthread_getcpuclockid is expected to return 0 code"); | |
| 5060 return clockid; | |
| 5061 } | |
| 5062 #endif | |
| 5063 | |
| 5064 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) | |
| 5065 // are used by JVM M&M and JVMTI to get user+sys or user CPU time | |
| 5066 // of a thread. | |
| 5067 // | |
| 5068 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns | |
| 5069 // the fast estimate available on the platform. | |
| 5070 | |
| 5071 jlong os::current_thread_cpu_time() { | |
| 5072 #ifdef __APPLE__ | |
| 5073 return os::thread_cpu_time(Thread::current(), true /* user + sys */); | |
| 5074 #elif !defined(_ALLBSD_SOURCE) | |
| 5075 if (os::Bsd::supports_fast_thread_cpu_time()) { | |
| 5076 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
| 5077 } else { | |
| 5078 // return user + sys since the cost is the same | |
| 5079 return slow_thread_cpu_time(Thread::current(), true /* user + sys */); | |
| 5080 } | |
| 5081 #endif | |
| 5082 } | |
| 5083 | |
| 5084 jlong os::thread_cpu_time(Thread* thread) { | |
| 5085 #ifndef _ALLBSD_SOURCE | |
| 5086 // consistent with what current_thread_cpu_time() returns | |
| 5087 if (os::Bsd::supports_fast_thread_cpu_time()) { | |
| 5088 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
| 5089 } else { | |
| 5090 return slow_thread_cpu_time(thread, true /* user + sys */); | |
| 5091 } | |
| 5092 #endif | |
| 5093 } | |
| 5094 | |
| 5095 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { | |
| 5096 #ifdef __APPLE__ | |
| 5097 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
| 5098 #elif !defined(_ALLBSD_SOURCE) | |
| 5099 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) { | |
| 5100 return os::Bsd::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID); | |
| 5101 } else { | |
| 5102 return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time); | |
| 5103 } | |
| 5104 #endif | |
| 5105 } | |
| 5106 | |
| 5107 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 5108 #ifdef __APPLE__ | |
| 5109 struct thread_basic_info tinfo; | |
| 5110 mach_msg_type_number_t tcount = THREAD_INFO_MAX; | |
| 5111 kern_return_t kr; | |
|
4961
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5112 thread_t mach_thread; |
|
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5113 |
|
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|
5114 mach_thread = thread->osthread()->thread_id(); |
| 3960 | 5115 kr = thread_info(mach_thread, THREAD_BASIC_INFO, (thread_info_t)&tinfo, &tcount); |
| 5116 if (kr != KERN_SUCCESS) | |
| 5117 return -1; | |
| 5118 | |
| 5119 if (user_sys_cpu_time) { | |
| 5120 jlong nanos; | |
| 5121 nanos = ((jlong) tinfo.system_time.seconds + tinfo.user_time.seconds) * (jlong)1000000000; | |
| 5122 nanos += ((jlong) tinfo.system_time.microseconds + (jlong) tinfo.user_time.microseconds) * (jlong)1000; | |
| 5123 return nanos; | |
| 5124 } else { | |
| 5125 return ((jlong)tinfo.user_time.seconds * 1000000000) + ((jlong)tinfo.user_time.microseconds * (jlong)1000); | |
| 5126 } | |
| 5127 #elif !defined(_ALLBSD_SOURCE) | |
| 5128 if (user_sys_cpu_time && os::Bsd::supports_fast_thread_cpu_time()) { | |
| 5129 return os::Bsd::fast_thread_cpu_time(thread_cpu_clockid(thread)); | |
| 5130 } else { | |
| 5131 return slow_thread_cpu_time(thread, user_sys_cpu_time); | |
| 5132 } | |
| 5133 #endif | |
| 5134 } | |
| 5135 | |
| 5136 #ifndef _ALLBSD_SOURCE | |
| 5137 // | |
| 5138 // -1 on error. | |
| 5139 // | |
| 5140 | |
| 5141 static jlong slow_thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { | |
| 5142 static bool proc_pid_cpu_avail = true; | |
| 5143 static bool proc_task_unchecked = true; | |
| 5144 static const char *proc_stat_path = "/proc/%d/stat"; | |
| 5145 pid_t tid = thread->osthread()->thread_id(); | |
| 5146 int i; | |
| 5147 char *s; | |
| 5148 char stat[2048]; | |
| 5149 int statlen; | |
| 5150 char proc_name[64]; | |
| 5151 int count; | |
| 5152 long sys_time, user_time; | |
| 5153 char string[64]; | |
| 5154 char cdummy; | |
| 5155 int idummy; | |
| 5156 long ldummy; | |
| 5157 FILE *fp; | |
| 5158 | |
| 5159 // We first try accessing /proc/<pid>/cpu since this is faster to | |
| 5160 // process. If this file is not present (bsd kernels 2.5 and above) | |
| 5161 // then we open /proc/<pid>/stat. | |
| 5162 if ( proc_pid_cpu_avail ) { | |
| 5163 sprintf(proc_name, "/proc/%d/cpu", tid); | |
| 5164 fp = fopen(proc_name, "r"); | |
| 5165 if ( fp != NULL ) { | |
| 5166 count = fscanf( fp, "%s %lu %lu\n", string, &user_time, &sys_time); | |
| 5167 fclose(fp); | |
| 5168 if ( count != 3 ) return -1; | |
| 5169 | |
| 5170 if (user_sys_cpu_time) { | |
| 5171 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
| 5172 } else { | |
| 5173 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
| 5174 } | |
| 5175 } | |
| 5176 else proc_pid_cpu_avail = false; | |
| 5177 } | |
| 5178 | |
| 5179 // The /proc/<tid>/stat aggregates per-process usage on | |
| 5180 // new Bsd kernels 2.6+ where NPTL is supported. | |
| 5181 // The /proc/self/task/<tid>/stat still has the per-thread usage. | |
| 5182 // See bug 6328462. | |
| 5183 // There can be no directory /proc/self/task on kernels 2.4 with NPTL | |
| 5184 // and possibly in some other cases, so we check its availability. | |
| 5185 if (proc_task_unchecked && os::Bsd::is_NPTL()) { | |
| 5186 // This is executed only once | |
| 5187 proc_task_unchecked = false; | |
| 5188 fp = fopen("/proc/self/task", "r"); | |
| 5189 if (fp != NULL) { | |
| 5190 proc_stat_path = "/proc/self/task/%d/stat"; | |
| 5191 fclose(fp); | |
| 5192 } | |
| 5193 } | |
| 5194 | |
| 5195 sprintf(proc_name, proc_stat_path, tid); | |
| 5196 fp = fopen(proc_name, "r"); | |
| 5197 if ( fp == NULL ) return -1; | |
| 5198 statlen = fread(stat, 1, 2047, fp); | |
| 5199 stat[statlen] = '\0'; | |
| 5200 fclose(fp); | |
| 5201 | |
| 5202 // Skip pid and the command string. Note that we could be dealing with | |
| 5203 // weird command names, e.g. user could decide to rename java launcher | |
| 5204 // to "java 1.4.2 :)", then the stat file would look like | |
| 5205 // 1234 (java 1.4.2 :)) R ... ... | |
| 5206 // We don't really need to know the command string, just find the last | |
| 5207 // occurrence of ")" and then start parsing from there. See bug 4726580. | |
| 5208 s = strrchr(stat, ')'); | |
| 5209 i = 0; | |
| 5210 if (s == NULL ) return -1; | |
| 5211 | |
| 5212 // Skip blank chars | |
| 5213 do s++; while (isspace(*s)); | |
| 5214 | |
| 5215 count = sscanf(s,"%c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu", | |
| 5216 &cdummy, &idummy, &idummy, &idummy, &idummy, &idummy, | |
| 5217 &ldummy, &ldummy, &ldummy, &ldummy, &ldummy, | |
| 5218 &user_time, &sys_time); | |
| 5219 if ( count != 13 ) return -1; | |
| 5220 if (user_sys_cpu_time) { | |
| 5221 return ((jlong)sys_time + (jlong)user_time) * (1000000000 / clock_tics_per_sec); | |
| 5222 } else { | |
| 5223 return (jlong)user_time * (1000000000 / clock_tics_per_sec); | |
| 5224 } | |
| 5225 } | |
| 5226 #endif | |
| 5227 | |
| 5228 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 5229 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 5230 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 5231 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 5232 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 5233 } | |
| 5234 | |
| 5235 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { | |
| 5236 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits | |
| 5237 info_ptr->may_skip_backward = false; // elapsed time not wall time | |
| 5238 info_ptr->may_skip_forward = false; // elapsed time not wall time | |
| 5239 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned | |
| 5240 } | |
| 5241 | |
| 5242 bool os::is_thread_cpu_time_supported() { | |
| 5243 #ifdef __APPLE__ | |
| 5244 return true; | |
| 5245 #elif defined(_ALLBSD_SOURCE) | |
| 5246 return false; | |
| 5247 #else | |
| 5248 return true; | |
| 5249 #endif | |
| 5250 } | |
| 5251 | |
| 5252 // System loadavg support. Returns -1 if load average cannot be obtained. | |
| 5253 // Bsd doesn't yet have a (official) notion of processor sets, | |
| 5254 // so just return the system wide load average. | |
| 5255 int os::loadavg(double loadavg[], int nelem) { | |
| 5256 return ::getloadavg(loadavg, nelem); | |
| 5257 } | |
| 5258 | |
| 5259 void os::pause() { | |
| 5260 char filename[MAX_PATH]; | |
| 5261 if (PauseAtStartupFile && PauseAtStartupFile[0]) { | |
| 5262 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); | |
| 5263 } else { | |
| 5264 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); | |
| 5265 } | |
| 5266 | |
| 5267 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); | |
| 5268 if (fd != -1) { | |
| 5269 struct stat buf; | |
| 5270 ::close(fd); | |
| 5271 while (::stat(filename, &buf) == 0) { | |
| 5272 (void)::poll(NULL, 0, 100); | |
| 5273 } | |
| 5274 } else { | |
| 5275 jio_fprintf(stderr, | |
| 5276 "Could not open pause file '%s', continuing immediately.\n", filename); | |
| 5277 } | |
| 5278 } | |
| 5279 | |
| 5280 | |
| 5281 // Refer to the comments in os_solaris.cpp park-unpark. | |
| 5282 // | |
| 5283 // Beware -- Some versions of NPTL embody a flaw where pthread_cond_timedwait() can | |
| 5284 // hang indefinitely. For instance NPTL 0.60 on 2.4.21-4ELsmp is vulnerable. | |
| 5285 // For specifics regarding the bug see GLIBC BUGID 261237 : | |
| 5286 // http://www.mail-archive.com/debian-glibc@lists.debian.org/msg10837.html. | |
| 5287 // Briefly, pthread_cond_timedwait() calls with an expiry time that's not in the future | |
| 5288 // will either hang or corrupt the condvar, resulting in subsequent hangs if the condvar | |
| 5289 // is used. (The simple C test-case provided in the GLIBC bug report manifests the | |
| 5290 // hang). The JVM is vulernable via sleep(), Object.wait(timo), LockSupport.parkNanos() | |
| 5291 // and monitorenter when we're using 1-0 locking. All those operations may result in | |
| 5292 // calls to pthread_cond_timedwait(). Using LD_ASSUME_KERNEL to use an older version | |
| 5293 // of libpthread avoids the problem, but isn't practical. | |
| 5294 // | |
| 5295 // Possible remedies: | |
| 5296 // | |
| 5297 // 1. Establish a minimum relative wait time. 50 to 100 msecs seems to work. | |
| 5298 // This is palliative and probabilistic, however. If the thread is preempted | |
| 5299 // between the call to compute_abstime() and pthread_cond_timedwait(), more | |
| 5300 // than the minimum period may have passed, and the abstime may be stale (in the | |
| 5301 // past) resultin in a hang. Using this technique reduces the odds of a hang | |
| 5302 // but the JVM is still vulnerable, particularly on heavily loaded systems. | |
| 5303 // | |
| 5304 // 2. Modify park-unpark to use per-thread (per ParkEvent) pipe-pairs instead | |
| 5305 // of the usual flag-condvar-mutex idiom. The write side of the pipe is set | |
| 5306 // NDELAY. unpark() reduces to write(), park() reduces to read() and park(timo) | |
| 5307 // reduces to poll()+read(). This works well, but consumes 2 FDs per extant | |
| 5308 // thread. | |
| 5309 // | |
| 5310 // 3. Embargo pthread_cond_timedwait() and implement a native "chron" thread | |
| 5311 // that manages timeouts. We'd emulate pthread_cond_timedwait() by enqueuing | |
| 5312 // a timeout request to the chron thread and then blocking via pthread_cond_wait(). | |
| 5313 // This also works well. In fact it avoids kernel-level scalability impediments | |
| 5314 // on certain platforms that don't handle lots of active pthread_cond_timedwait() | |
| 5315 // timers in a graceful fashion. | |
| 5316 // | |
| 5317 // 4. When the abstime value is in the past it appears that control returns | |
| 5318 // correctly from pthread_cond_timedwait(), but the condvar is left corrupt. | |
| 5319 // Subsequent timedwait/wait calls may hang indefinitely. Given that, we | |
| 5320 // can avoid the problem by reinitializing the condvar -- by cond_destroy() | |
| 5321 // followed by cond_init() -- after all calls to pthread_cond_timedwait(). | |
| 5322 // It may be possible to avoid reinitialization by checking the return | |
| 5323 // value from pthread_cond_timedwait(). In addition to reinitializing the | |
| 5324 // condvar we must establish the invariant that cond_signal() is only called | |
| 5325 // within critical sections protected by the adjunct mutex. This prevents | |
| 5326 // cond_signal() from "seeing" a condvar that's in the midst of being | |
| 5327 // reinitialized or that is corrupt. Sadly, this invariant obviates the | |
| 5328 // desirable signal-after-unlock optimization that avoids futile context switching. | |
| 5329 // | |
| 5330 // I'm also concerned that some versions of NTPL might allocate an auxilliary | |
| 5331 // structure when a condvar is used or initialized. cond_destroy() would | |
| 5332 // release the helper structure. Our reinitialize-after-timedwait fix | |
| 5333 // put excessive stress on malloc/free and locks protecting the c-heap. | |
| 5334 // | |
| 5335 // We currently use (4). See the WorkAroundNTPLTimedWaitHang flag. | |
| 5336 // It may be possible to refine (4) by checking the kernel and NTPL verisons | |
| 5337 // and only enabling the work-around for vulnerable environments. | |
| 5338 | |
| 5339 // utility to compute the abstime argument to timedwait: | |
| 5340 // millis is the relative timeout time | |
| 5341 // abstime will be the absolute timeout time | |
| 5342 // TODO: replace compute_abstime() with unpackTime() | |
| 5343 | |
| 5344 static struct timespec* compute_abstime(struct timespec* abstime, jlong millis) { | |
| 5345 if (millis < 0) millis = 0; | |
| 5346 struct timeval now; | |
| 5347 int status = gettimeofday(&now, NULL); | |
| 5348 assert(status == 0, "gettimeofday"); | |
| 5349 jlong seconds = millis / 1000; | |
| 5350 millis %= 1000; | |
| 5351 if (seconds > 50000000) { // see man cond_timedwait(3T) | |
| 5352 seconds = 50000000; | |
| 5353 } | |
| 5354 abstime->tv_sec = now.tv_sec + seconds; | |
| 5355 long usec = now.tv_usec + millis * 1000; | |
| 5356 if (usec >= 1000000) { | |
| 5357 abstime->tv_sec += 1; | |
| 5358 usec -= 1000000; | |
| 5359 } | |
| 5360 abstime->tv_nsec = usec * 1000; | |
| 5361 return abstime; | |
| 5362 } | |
| 5363 | |
| 5364 | |
| 5365 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. | |
| 5366 // Conceptually TryPark() should be equivalent to park(0). | |
| 5367 | |
| 5368 int os::PlatformEvent::TryPark() { | |
| 5369 for (;;) { | |
| 5370 const int v = _Event ; | |
| 5371 guarantee ((v == 0) || (v == 1), "invariant") ; | |
| 5372 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; | |
| 5373 } | |
| 5374 } | |
| 5375 | |
| 5376 void os::PlatformEvent::park() { // AKA "down()" | |
| 5377 // Invariant: Only the thread associated with the Event/PlatformEvent | |
| 5378 // may call park(). | |
| 5379 // TODO: assert that _Assoc != NULL or _Assoc == Self | |
| 5380 int v ; | |
| 5381 for (;;) { | |
| 5382 v = _Event ; | |
| 5383 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 5384 } | |
| 5385 guarantee (v >= 0, "invariant") ; | |
| 5386 if (v == 0) { | |
| 5387 // Do this the hard way by blocking ... | |
| 5388 int status = pthread_mutex_lock(_mutex); | |
| 5389 assert_status(status == 0, status, "mutex_lock"); | |
| 5390 guarantee (_nParked == 0, "invariant") ; | |
| 5391 ++ _nParked ; | |
| 5392 while (_Event < 0) { | |
| 5393 status = pthread_cond_wait(_cond, _mutex); | |
| 5394 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... | |
| 5395 // Treat this the same as if the wait was interrupted | |
| 5396 if (status == ETIMEDOUT) { status = EINTR; } | |
| 5397 assert_status(status == 0 || status == EINTR, status, "cond_wait"); | |
| 5398 } | |
| 5399 -- _nParked ; | |
| 5400 | |
| 5401 // In theory we could move the ST of 0 into _Event past the unlock(), | |
| 5402 // but then we'd need a MEMBAR after the ST. | |
| 5403 _Event = 0 ; | |
| 5404 status = pthread_mutex_unlock(_mutex); | |
| 5405 assert_status(status == 0, status, "mutex_unlock"); | |
| 5406 } | |
| 5407 guarantee (_Event >= 0, "invariant") ; | |
| 5408 } | |
| 5409 | |
| 5410 int os::PlatformEvent::park(jlong millis) { | |
| 5411 guarantee (_nParked == 0, "invariant") ; | |
| 5412 | |
| 5413 int v ; | |
| 5414 for (;;) { | |
| 5415 v = _Event ; | |
| 5416 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; | |
| 5417 } | |
| 5418 guarantee (v >= 0, "invariant") ; | |
| 5419 if (v != 0) return OS_OK ; | |
| 5420 | |
| 5421 // We do this the hard way, by blocking the thread. | |
| 5422 // Consider enforcing a minimum timeout value. | |
| 5423 struct timespec abst; | |
| 5424 compute_abstime(&abst, millis); | |
| 5425 | |
| 5426 int ret = OS_TIMEOUT; | |
| 5427 int status = pthread_mutex_lock(_mutex); | |
| 5428 assert_status(status == 0, status, "mutex_lock"); | |
| 5429 guarantee (_nParked == 0, "invariant") ; | |
| 5430 ++_nParked ; | |
| 5431 | |
| 5432 // Object.wait(timo) will return because of | |
| 5433 // (a) notification | |
| 5434 // (b) timeout | |
| 5435 // (c) thread.interrupt | |
| 5436 // | |
| 5437 // Thread.interrupt and object.notify{All} both call Event::set. | |
| 5438 // That is, we treat thread.interrupt as a special case of notification. | |
| 5439 // The underlying Solaris implementation, cond_timedwait, admits | |
| 5440 // spurious/premature wakeups, but the JLS/JVM spec prevents the | |
| 5441 // JVM from making those visible to Java code. As such, we must | |
| 5442 // filter out spurious wakeups. We assume all ETIME returns are valid. | |
| 5443 // | |
| 5444 // TODO: properly differentiate simultaneous notify+interrupt. | |
| 5445 // In that case, we should propagate the notify to another waiter. | |
| 5446 | |
| 5447 while (_Event < 0) { | |
| 5448 status = os::Bsd::safe_cond_timedwait(_cond, _mutex, &abst); | |
| 5449 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 5450 pthread_cond_destroy (_cond); | |
| 5451 pthread_cond_init (_cond, NULL) ; | |
| 5452 } | |
| 5453 assert_status(status == 0 || status == EINTR || | |
| 5454 status == ETIMEDOUT, | |
| 5455 status, "cond_timedwait"); | |
| 5456 if (!FilterSpuriousWakeups) break ; // previous semantics | |
| 5457 if (status == ETIMEDOUT) break ; | |
| 5458 // We consume and ignore EINTR and spurious wakeups. | |
| 5459 } | |
| 5460 --_nParked ; | |
| 5461 if (_Event >= 0) { | |
| 5462 ret = OS_OK; | |
| 5463 } | |
| 5464 _Event = 0 ; | |
| 5465 status = pthread_mutex_unlock(_mutex); | |
| 5466 assert_status(status == 0, status, "mutex_unlock"); | |
| 5467 assert (_nParked == 0, "invariant") ; | |
| 5468 return ret; | |
| 5469 } | |
| 5470 | |
| 5471 void os::PlatformEvent::unpark() { | |
| 5472 int v, AnyWaiters ; | |
| 5473 for (;;) { | |
| 5474 v = _Event ; | |
| 5475 if (v > 0) { | |
| 5476 // The LD of _Event could have reordered or be satisfied | |
| 5477 // by a read-aside from this processor's write buffer. | |
| 5478 // To avoid problems execute a barrier and then | |
| 5479 // ratify the value. | |
| 5480 OrderAccess::fence() ; | |
| 5481 if (_Event == v) return ; | |
| 5482 continue ; | |
| 5483 } | |
| 5484 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; | |
| 5485 } | |
| 5486 if (v < 0) { | |
| 5487 // Wait for the thread associated with the event to vacate | |
| 5488 int status = pthread_mutex_lock(_mutex); | |
| 5489 assert_status(status == 0, status, "mutex_lock"); | |
| 5490 AnyWaiters = _nParked ; | |
| 5491 assert (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; | |
| 5492 if (AnyWaiters != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 5493 AnyWaiters = 0 ; | |
| 5494 pthread_cond_signal (_cond); | |
| 5495 } | |
| 5496 status = pthread_mutex_unlock(_mutex); | |
| 5497 assert_status(status == 0, status, "mutex_unlock"); | |
| 5498 if (AnyWaiters != 0) { | |
| 5499 status = pthread_cond_signal(_cond); | |
| 5500 assert_status(status == 0, status, "cond_signal"); | |
| 5501 } | |
| 5502 } | |
| 5503 | |
| 5504 // Note that we signal() _after dropping the lock for "immortal" Events. | |
| 5505 // This is safe and avoids a common class of futile wakeups. In rare | |
| 5506 // circumstances this can cause a thread to return prematurely from | |
| 5507 // cond_{timed}wait() but the spurious wakeup is benign and the victim will | |
| 5508 // simply re-test the condition and re-park itself. | |
| 5509 } | |
| 5510 | |
| 5511 | |
| 5512 // JSR166 | |
| 5513 // ------------------------------------------------------- | |
| 5514 | |
| 5515 /* | |
| 5516 * The solaris and bsd implementations of park/unpark are fairly | |
| 5517 * conservative for now, but can be improved. They currently use a | |
| 5518 * mutex/condvar pair, plus a a count. | |
| 5519 * Park decrements count if > 0, else does a condvar wait. Unpark | |
| 5520 * sets count to 1 and signals condvar. Only one thread ever waits | |
| 5521 * on the condvar. Contention seen when trying to park implies that someone | |
| 5522 * is unparking you, so don't wait. And spurious returns are fine, so there | |
| 5523 * is no need to track notifications. | |
| 5524 */ | |
| 5525 | |
| 5526 #define MAX_SECS 100000000 | |
| 5527 /* | |
| 5528 * This code is common to bsd and solaris and will be moved to a | |
| 5529 * common place in dolphin. | |
| 5530 * | |
| 5531 * The passed in time value is either a relative time in nanoseconds | |
| 5532 * or an absolute time in milliseconds. Either way it has to be unpacked | |
| 5533 * into suitable seconds and nanoseconds components and stored in the | |
| 5534 * given timespec structure. | |
| 5535 * Given time is a 64-bit value and the time_t used in the timespec is only | |
| 5536 * a signed-32-bit value (except on 64-bit Bsd) we have to watch for | |
| 5537 * overflow if times way in the future are given. Further on Solaris versions | |
| 5538 * prior to 10 there is a restriction (see cond_timedwait) that the specified | |
| 5539 * number of seconds, in abstime, is less than current_time + 100,000,000. | |
| 5540 * As it will be 28 years before "now + 100000000" will overflow we can | |
| 5541 * ignore overflow and just impose a hard-limit on seconds using the value | |
| 5542 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 | |
| 5543 * years from "now". | |
| 5544 */ | |
| 5545 | |
| 5546 static void unpackTime(struct timespec* absTime, bool isAbsolute, jlong time) { | |
| 5547 assert (time > 0, "convertTime"); | |
| 5548 | |
| 5549 struct timeval now; | |
| 5550 int status = gettimeofday(&now, NULL); | |
| 5551 assert(status == 0, "gettimeofday"); | |
| 5552 | |
| 5553 time_t max_secs = now.tv_sec + MAX_SECS; | |
| 5554 | |
| 5555 if (isAbsolute) { | |
| 5556 jlong secs = time / 1000; | |
| 5557 if (secs > max_secs) { | |
| 5558 absTime->tv_sec = max_secs; | |
| 5559 } | |
| 5560 else { | |
| 5561 absTime->tv_sec = secs; | |
| 5562 } | |
| 5563 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; | |
| 5564 } | |
| 5565 else { | |
| 5566 jlong secs = time / NANOSECS_PER_SEC; | |
| 5567 if (secs >= MAX_SECS) { | |
| 5568 absTime->tv_sec = max_secs; | |
| 5569 absTime->tv_nsec = 0; | |
| 5570 } | |
| 5571 else { | |
| 5572 absTime->tv_sec = now.tv_sec + secs; | |
| 5573 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; | |
| 5574 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { | |
| 5575 absTime->tv_nsec -= NANOSECS_PER_SEC; | |
| 5576 ++absTime->tv_sec; // note: this must be <= max_secs | |
| 5577 } | |
| 5578 } | |
| 5579 } | |
| 5580 assert(absTime->tv_sec >= 0, "tv_sec < 0"); | |
| 5581 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); | |
| 5582 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); | |
| 5583 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); | |
| 5584 } | |
| 5585 | |
| 5586 void Parker::park(bool isAbsolute, jlong time) { | |
| 5587 // Optional fast-path check: | |
| 5588 // Return immediately if a permit is available. | |
| 5589 if (_counter > 0) { | |
| 5590 _counter = 0 ; | |
| 5591 OrderAccess::fence(); | |
| 5592 return ; | |
| 5593 } | |
| 5594 | |
| 5595 Thread* thread = Thread::current(); | |
| 5596 assert(thread->is_Java_thread(), "Must be JavaThread"); | |
| 5597 JavaThread *jt = (JavaThread *)thread; | |
| 5598 | |
| 5599 // Optional optimization -- avoid state transitions if there's an interrupt pending. | |
| 5600 // Check interrupt before trying to wait | |
| 5601 if (Thread::is_interrupted(thread, false)) { | |
| 5602 return; | |
| 5603 } | |
| 5604 | |
| 5605 // Next, demultiplex/decode time arguments | |
| 5606 struct timespec absTime; | |
| 5607 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all | |
| 5608 return; | |
| 5609 } | |
| 5610 if (time > 0) { | |
| 5611 unpackTime(&absTime, isAbsolute, time); | |
| 5612 } | |
| 5613 | |
| 5614 | |
| 5615 // Enter safepoint region | |
| 5616 // Beware of deadlocks such as 6317397. | |
| 5617 // The per-thread Parker:: mutex is a classic leaf-lock. | |
| 5618 // In particular a thread must never block on the Threads_lock while | |
| 5619 // holding the Parker:: mutex. If safepoints are pending both the | |
| 5620 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. | |
| 5621 ThreadBlockInVM tbivm(jt); | |
| 5622 | |
| 5623 // Don't wait if cannot get lock since interference arises from | |
| 5624 // unblocking. Also. check interrupt before trying wait | |
| 5625 if (Thread::is_interrupted(thread, false) || pthread_mutex_trylock(_mutex) != 0) { | |
| 5626 return; | |
| 5627 } | |
| 5628 | |
| 5629 int status ; | |
| 5630 if (_counter > 0) { // no wait needed | |
| 5631 _counter = 0; | |
| 5632 status = pthread_mutex_unlock(_mutex); | |
| 5633 assert (status == 0, "invariant") ; | |
| 5634 OrderAccess::fence(); | |
| 5635 return; | |
| 5636 } | |
| 5637 | |
| 5638 #ifdef ASSERT | |
| 5639 // Don't catch signals while blocked; let the running threads have the signals. | |
| 5640 // (This allows a debugger to break into the running thread.) | |
| 5641 sigset_t oldsigs; | |
| 5642 sigset_t* allowdebug_blocked = os::Bsd::allowdebug_blocked_signals(); | |
| 5643 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); | |
| 5644 #endif | |
| 5645 | |
| 5646 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); | |
| 5647 jt->set_suspend_equivalent(); | |
| 5648 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() | |
| 5649 | |
| 5650 if (time == 0) { | |
| 5651 status = pthread_cond_wait (_cond, _mutex) ; | |
| 5652 } else { | |
| 5653 status = os::Bsd::safe_cond_timedwait (_cond, _mutex, &absTime) ; | |
| 5654 if (status != 0 && WorkAroundNPTLTimedWaitHang) { | |
| 5655 pthread_cond_destroy (_cond) ; | |
| 5656 pthread_cond_init (_cond, NULL); | |
| 5657 } | |
| 5658 } | |
| 5659 assert_status(status == 0 || status == EINTR || | |
| 5660 status == ETIMEDOUT, | |
| 5661 status, "cond_timedwait"); | |
| 5662 | |
| 5663 #ifdef ASSERT | |
| 5664 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); | |
| 5665 #endif | |
| 5666 | |
| 5667 _counter = 0 ; | |
| 5668 status = pthread_mutex_unlock(_mutex) ; | |
| 5669 assert_status(status == 0, status, "invariant") ; | |
| 5670 // If externally suspended while waiting, re-suspend | |
| 5671 if (jt->handle_special_suspend_equivalent_condition()) { | |
| 5672 jt->java_suspend_self(); | |
| 5673 } | |
| 5674 | |
| 5675 OrderAccess::fence(); | |
| 5676 } | |
| 5677 | |
| 5678 void Parker::unpark() { | |
| 5679 int s, status ; | |
| 5680 status = pthread_mutex_lock(_mutex); | |
| 5681 assert (status == 0, "invariant") ; | |
| 5682 s = _counter; | |
| 5683 _counter = 1; | |
| 5684 if (s < 1) { | |
| 5685 if (WorkAroundNPTLTimedWaitHang) { | |
| 5686 status = pthread_cond_signal (_cond) ; | |
| 5687 assert (status == 0, "invariant") ; | |
| 5688 status = pthread_mutex_unlock(_mutex); | |
| 5689 assert (status == 0, "invariant") ; | |
| 5690 } else { | |
| 5691 status = pthread_mutex_unlock(_mutex); | |
| 5692 assert (status == 0, "invariant") ; | |
| 5693 status = pthread_cond_signal (_cond) ; | |
| 5694 assert (status == 0, "invariant") ; | |
| 5695 } | |
| 5696 } else { | |
| 5697 pthread_mutex_unlock(_mutex); | |
| 5698 assert (status == 0, "invariant") ; | |
| 5699 } | |
| 5700 } | |
| 5701 | |
| 5702 | |
| 5703 /* Darwin has no "environ" in a dynamic library. */ | |
| 5704 #ifdef __APPLE__ | |
| 5705 #include <crt_externs.h> | |
| 5706 #define environ (*_NSGetEnviron()) | |
| 5707 #else | |
| 5708 extern char** environ; | |
| 5709 #endif | |
| 5710 | |
| 5711 // Run the specified command in a separate process. Return its exit value, | |
| 5712 // or -1 on failure (e.g. can't fork a new process). | |
| 5713 // Unlike system(), this function can be called from signal handler. It | |
| 5714 // doesn't block SIGINT et al. | |
| 5715 int os::fork_and_exec(char* cmd) { | |
| 5716 const char * argv[4] = {"sh", "-c", cmd, NULL}; | |
| 5717 | |
| 5718 // fork() in BsdThreads/NPTL is not async-safe. It needs to run | |
| 5719 // pthread_atfork handlers and reset pthread library. All we need is a | |
| 5720 // separate process to execve. Make a direct syscall to fork process. | |
| 5721 // On IA64 there's no fork syscall, we have to use fork() and hope for | |
| 5722 // the best... | |
| 5723 pid_t pid = fork(); | |
| 5724 | |
| 5725 if (pid < 0) { | |
| 5726 // fork failed | |
| 5727 return -1; | |
| 5728 | |
| 5729 } else if (pid == 0) { | |
| 5730 // child process | |
| 5731 | |
| 5732 // execve() in BsdThreads will call pthread_kill_other_threads_np() | |
| 5733 // first to kill every thread on the thread list. Because this list is | |
| 5734 // not reset by fork() (see notes above), execve() will instead kill | |
| 5735 // every thread in the parent process. We know this is the only thread | |
| 5736 // in the new process, so make a system call directly. | |
| 5737 // IA64 should use normal execve() from glibc to match the glibc fork() | |
| 5738 // above. | |
| 5739 execve("/bin/sh", (char* const*)argv, environ); | |
| 5740 | |
| 5741 // execve failed | |
| 5742 _exit(-1); | |
| 5743 | |
| 5744 } else { | |
| 5745 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't | |
| 5746 // care about the actual exit code, for now. | |
| 5747 | |
| 5748 int status; | |
| 5749 | |
| 5750 // Wait for the child process to exit. This returns immediately if | |
| 5751 // the child has already exited. */ | |
| 5752 while (waitpid(pid, &status, 0) < 0) { | |
| 5753 switch (errno) { | |
| 5754 case ECHILD: return 0; | |
| 5755 case EINTR: break; | |
| 5756 default: return -1; | |
| 5757 } | |
| 5758 } | |
| 5759 | |
| 5760 if (WIFEXITED(status)) { | |
| 5761 // The child exited normally; get its exit code. | |
| 5762 return WEXITSTATUS(status); | |
| 5763 } else if (WIFSIGNALED(status)) { | |
| 5764 // The child exited because of a signal | |
| 5765 // The best value to return is 0x80 + signal number, | |
| 5766 // because that is what all Unix shells do, and because | |
| 5767 // it allows callers to distinguish between process exit and | |
| 5768 // process death by signal. | |
| 5769 return 0x80 + WTERMSIG(status); | |
| 5770 } else { | |
| 5771 // Unknown exit code; pass it through | |
| 5772 return status; | |
| 5773 } | |
| 5774 } | |
| 5775 } | |
| 5776 | |
| 5777 // is_headless_jre() | |
| 5778 // | |
|
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5779 // Test for the existence of xawt/libmawt.so or libawt_xawt.so |
| 3960 | 5780 // in order to report if we are running in a headless jre |
| 5781 // | |
|
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5782 // Since JDK8 xawt/libmawt.so was moved into the same directory |
|
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5783 // as libawt.so, and renamed libawt_xawt.so |
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5784 // |
| 3960 | 5785 bool os::is_headless_jre() { |
| 5786 struct stat statbuf; | |
| 5787 char buf[MAXPATHLEN]; | |
| 5788 char libmawtpath[MAXPATHLEN]; | |
| 4006 | 5789 const char *xawtstr = "/xawt/libmawt" JNI_LIB_SUFFIX; |
| 5921 | 5790 const char *new_xawtstr = "/libawt_xawt" JNI_LIB_SUFFIX; |
| 3960 | 5791 char *p; |
| 5792 | |
| 5793 // Get path to libjvm.so | |
| 5794 os::jvm_path(buf, sizeof(buf)); | |
| 5795 | |
| 5796 // Get rid of libjvm.so | |
| 5797 p = strrchr(buf, '/'); | |
| 5798 if (p == NULL) return false; | |
| 5799 else *p = '\0'; | |
| 5800 | |
| 5801 // Get rid of client or server | |
| 5802 p = strrchr(buf, '/'); | |
| 5803 if (p == NULL) return false; | |
| 5804 else *p = '\0'; | |
| 5805 | |
| 5806 // check xawt/libmawt.so | |
| 5807 strcpy(libmawtpath, buf); | |
| 5808 strcat(libmawtpath, xawtstr); | |
| 5809 if (::stat(libmawtpath, &statbuf) == 0) return false; | |
| 5810 | |
|
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5811 // check libawt_xawt.so |
| 3960 | 5812 strcpy(libmawtpath, buf); |
|
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5813 strcat(libmawtpath, new_xawtstr); |
| 3960 | 5814 if (::stat(libmawtpath, &statbuf) == 0) return false; |
| 5815 | |
| 5816 return true; | |
| 5817 } | |
|
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5818 |
|
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5819 // Get the default path to the core file |
|
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5820 // Returns the length of the string |
|
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|
5821 int os::get_core_path(char* buffer, size_t bufferSize) { |
|
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5822 int n = jio_snprintf(buffer, bufferSize, "/cores"); |
|
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|
5823 |
|
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|
5824 // Truncate if theoretical string was longer than bufferSize |
|
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|
5825 n = MIN2(n, (int)bufferSize); |
|
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|
5826 |
|
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|
5827 return n; |
|
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|
5828 } |