annotate src/os/bsd/vm/os_bsd.cpp @ 4413:553ac1e00352

8006431: os::Bsd::initialize_system_info() sets _physical_memory too large Summary: Use HW_MEMSIZE instead of HW_USERMEM to get a 64 bit value of the physical memory on the machine. Also reviewed by vitalyd@gmail.com. Reviewed-by: sla, dholmes, dlong, mikael
author brutisso
date Mon, 21 Jan 2013 09:00:04 +0100
parents bb74dc5ddf07
children 586fe6358916
rev   line source
never@3009 1 /*
phh@3350 2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
never@3009 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@3009 4 *
never@3009 5 * This code is free software; you can redistribute it and/or modify it
never@3009 6 * under the terms of the GNU General Public License version 2 only, as
never@3009 7 * published by the Free Software Foundation.
never@3009 8 *
never@3009 9 * This code is distributed in the hope that it will be useful, but WITHOUT
never@3009 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@3009 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
never@3009 12 * version 2 for more details (a copy is included in the LICENSE file that
never@3009 13 * accompanied this code).
never@3009 14 *
never@3009 15 * You should have received a copy of the GNU General Public License version
never@3009 16 * 2 along with this work; if not, write to the Free Software Foundation,
never@3009 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@3009 18 *
never@3009 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
never@3009 20 * or visit www.oracle.com if you need additional information or have any
never@3009 21 * questions.
never@3009 22 *
never@3009 23 */
never@3009 24
never@3009 25 // no precompiled headers
never@3009 26 #include "classfile/classLoader.hpp"
never@3009 27 #include "classfile/systemDictionary.hpp"
never@3009 28 #include "classfile/vmSymbols.hpp"
never@3009 29 #include "code/icBuffer.hpp"
never@3009 30 #include "code/vtableStubs.hpp"
never@3009 31 #include "compiler/compileBroker.hpp"
never@3009 32 #include "interpreter/interpreter.hpp"
never@3009 33 #include "jvm_bsd.h"
never@3009 34 #include "memory/allocation.inline.hpp"
never@3009 35 #include "memory/filemap.hpp"
never@3009 36 #include "mutex_bsd.inline.hpp"
never@3009 37 #include "oops/oop.inline.hpp"
never@3009 38 #include "os_share_bsd.hpp"
never@3009 39 #include "prims/jniFastGetField.hpp"
never@3009 40 #include "prims/jvm.h"
never@3009 41 #include "prims/jvm_misc.hpp"
never@3009 42 #include "runtime/arguments.hpp"
never@3009 43 #include "runtime/extendedPC.hpp"
never@3009 44 #include "runtime/globals.hpp"
never@3009 45 #include "runtime/interfaceSupport.hpp"
never@3009 46 #include "runtime/java.hpp"
never@3009 47 #include "runtime/javaCalls.hpp"
never@3009 48 #include "runtime/mutexLocker.hpp"
never@3009 49 #include "runtime/objectMonitor.hpp"
never@3009 50 #include "runtime/osThread.hpp"
never@3009 51 #include "runtime/perfMemory.hpp"
never@3009 52 #include "runtime/sharedRuntime.hpp"
never@3009 53 #include "runtime/statSampler.hpp"
never@3009 54 #include "runtime/stubRoutines.hpp"
never@3009 55 #include "runtime/threadCritical.hpp"
never@3009 56 #include "runtime/timer.hpp"
never@3009 57 #include "services/attachListener.hpp"
never@3009 58 #include "services/runtimeService.hpp"
never@3009 59 #include "thread_bsd.inline.hpp"
never@3009 60 #include "utilities/decoder.hpp"
never@3009 61 #include "utilities/defaultStream.hpp"
never@3009 62 #include "utilities/events.hpp"
never@3009 63 #include "utilities/growableArray.hpp"
never@3009 64 #include "utilities/vmError.hpp"
never@3009 65 #ifdef TARGET_ARCH_x86
never@3009 66 # include "assembler_x86.inline.hpp"
never@3009 67 # include "nativeInst_x86.hpp"
never@3009 68 #endif
never@3009 69 #ifdef TARGET_ARCH_sparc
never@3009 70 # include "assembler_sparc.inline.hpp"
never@3009 71 # include "nativeInst_sparc.hpp"
never@3009 72 #endif
never@3009 73 #ifdef TARGET_ARCH_zero
never@3009 74 # include "assembler_zero.inline.hpp"
never@3009 75 # include "nativeInst_zero.hpp"
never@3009 76 #endif
never@3009 77 #ifdef TARGET_ARCH_arm
never@3009 78 # include "assembler_arm.inline.hpp"
never@3009 79 # include "nativeInst_arm.hpp"
never@3009 80 #endif
never@3009 81 #ifdef TARGET_ARCH_ppc
never@3009 82 # include "assembler_ppc.inline.hpp"
never@3009 83 # include "nativeInst_ppc.hpp"
never@3009 84 #endif
never@3009 85
never@3009 86 // put OS-includes here
never@3009 87 # include <sys/types.h>
never@3009 88 # include <sys/mman.h>
never@3009 89 # include <sys/stat.h>
never@3009 90 # include <sys/select.h>
never@3009 91 # include <pthread.h>
never@3009 92 # include <signal.h>
never@3009 93 # include <errno.h>
never@3009 94 # include <dlfcn.h>
never@3009 95 # include <stdio.h>
never@3009 96 # include <unistd.h>
never@3009 97 # include <sys/resource.h>
never@3009 98 # include <pthread.h>
never@3009 99 # include <sys/stat.h>
never@3009 100 # include <sys/time.h>
never@3009 101 # include <sys/times.h>
never@3009 102 # include <sys/utsname.h>
never@3009 103 # include <sys/socket.h>
never@3009 104 # include <sys/wait.h>
never@3009 105 # include <time.h>
never@3009 106 # include <pwd.h>
never@3009 107 # include <poll.h>
never@3009 108 # include <semaphore.h>
never@3009 109 # include <fcntl.h>
never@3009 110 # include <string.h>
never@3009 111 #ifdef _ALLBSD_SOURCE
never@3009 112 # include <sys/param.h>
never@3009 113 # include <sys/sysctl.h>
never@3009 114 #else
never@3009 115 # include <syscall.h>
never@3009 116 # include <sys/sysinfo.h>
never@3009 117 # include <gnu/libc-version.h>
never@3009 118 #endif
never@3009 119 # include <sys/ipc.h>
never@3009 120 # include <sys/shm.h>
never@3009 121 #ifndef __APPLE__
never@3009 122 # include <link.h>
never@3009 123 #endif
never@3009 124 # include <stdint.h>
never@3009 125 # include <inttypes.h>
never@3009 126 # include <sys/ioctl.h>
never@3009 127
never@3009 128 #if defined(__FreeBSD__) || defined(__NetBSD__)
never@3009 129 # include <elf.h>
never@3009 130 #endif
never@3009 131
never@3009 132 #ifdef __APPLE__
dcubed@3055 133 # include <mach/mach.h> // semaphore_* API
dcubed@3055 134 # include <mach-o/dyld.h>
dcubed@3055 135 # include <sys/proc_info.h>
dcubed@3055 136 # include <objc/objc-auto.h>
never@3009 137 #endif
never@3009 138
never@3009 139 #ifndef MAP_ANONYMOUS
never@3009 140 #define MAP_ANONYMOUS MAP_ANON
never@3009 141 #endif
never@3009 142
never@3009 143 #define MAX_PATH (2 * K)
never@3009 144
never@3009 145 // for timer info max values which include all bits
never@3009 146 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
never@3009 147
never@3009 148 #define LARGEPAGES_BIT (1 << 6)
never@3009 149 ////////////////////////////////////////////////////////////////////////////////
never@3009 150 // global variables
never@3009 151 julong os::Bsd::_physical_memory = 0;
never@3009 152
never@3009 153 #ifndef _ALLBSD_SOURCE
never@3009 154 address os::Bsd::_initial_thread_stack_bottom = NULL;
never@3009 155 uintptr_t os::Bsd::_initial_thread_stack_size = 0;
never@3009 156 #endif
never@3009 157
never@3009 158 int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;
never@3009 159 #ifndef _ALLBSD_SOURCE
never@3009 160 int (*os::Bsd::_pthread_getcpuclockid)(pthread_t, clockid_t *) = NULL;
never@3009 161 Mutex* os::Bsd::_createThread_lock = NULL;
never@3009 162 #endif
never@3009 163 pthread_t os::Bsd::_main_thread;
never@3009 164 int os::Bsd::_page_size = -1;
never@3009 165 #ifndef _ALLBSD_SOURCE
never@3009 166 bool os::Bsd::_is_floating_stack = false;
never@3009 167 bool os::Bsd::_is_NPTL = false;
never@3009 168 bool os::Bsd::_supports_fast_thread_cpu_time = false;
never@3009 169 const char * os::Bsd::_glibc_version = NULL;
never@3009 170 const char * os::Bsd::_libpthread_version = NULL;
never@3009 171 #endif
never@3009 172
never@3009 173 static jlong initial_time_count=0;
never@3009 174
never@3009 175 static int clock_tics_per_sec = 100;
never@3009 176
never@3009 177 // For diagnostics to print a message once. see run_periodic_checks
never@3009 178 static sigset_t check_signal_done;
never@3009 179 static bool check_signals = true;;
never@3009 180
never@3009 181 static pid_t _initial_pid = 0;
never@3009 182
never@3009 183 /* Signal number used to suspend/resume a thread */
never@3009 184
never@3009 185 /* do not use any signal number less than SIGSEGV, see 4355769 */
never@3009 186 static int SR_signum = SIGUSR2;
never@3009 187 sigset_t SR_sigset;
never@3009 188
never@3009 189
never@3009 190 ////////////////////////////////////////////////////////////////////////////////
never@3009 191 // utility functions
never@3009 192
never@3009 193 static int SR_initialize();
never@3009 194 static int SR_finalize();
never@3009 195
never@3009 196 julong os::available_memory() {
never@3009 197 return Bsd::available_memory();
never@3009 198 }
never@3009 199
never@3009 200 julong os::Bsd::available_memory() {
never@3009 201 #ifdef _ALLBSD_SOURCE
never@3009 202 // XXXBSD: this is just a stopgap implementation
never@3009 203 return physical_memory() >> 2;
never@3009 204 #else
never@3009 205 // values in struct sysinfo are "unsigned long"
never@3009 206 struct sysinfo si;
never@3009 207 sysinfo(&si);
never@3009 208
never@3009 209 return (julong)si.freeram * si.mem_unit;
never@3009 210 #endif
never@3009 211 }
never@3009 212
never@3009 213 julong os::physical_memory() {
never@3009 214 return Bsd::physical_memory();
never@3009 215 }
never@3009 216
never@3009 217 julong os::allocatable_physical_memory(julong size) {
never@3009 218 #ifdef _LP64
never@3009 219 return size;
never@3009 220 #else
never@3009 221 julong result = MIN2(size, (julong)3800*M);
never@3009 222 if (!is_allocatable(result)) {
never@3009 223 // See comments under solaris for alignment considerations
never@3009 224 julong reasonable_size = (julong)2*G - 2 * os::vm_page_size();
never@3009 225 result = MIN2(size, reasonable_size);
never@3009 226 }
never@3009 227 return result;
never@3009 228 #endif // _LP64
never@3009 229 }
never@3009 230
never@3009 231 ////////////////////////////////////////////////////////////////////////////////
never@3009 232 // environment support
never@3009 233
never@3009 234 bool os::getenv(const char* name, char* buf, int len) {
never@3009 235 const char* val = ::getenv(name);
never@3009 236 if (val != NULL && strlen(val) < (size_t)len) {
never@3009 237 strcpy(buf, val);
never@3009 238 return true;
never@3009 239 }
never@3009 240 if (len > 0) buf[0] = 0; // return a null string
never@3009 241 return false;
never@3009 242 }
never@3009 243
never@3009 244
never@3009 245 // Return true if user is running as root.
never@3009 246
never@3009 247 bool os::have_special_privileges() {
never@3009 248 static bool init = false;
never@3009 249 static bool privileges = false;
never@3009 250 if (!init) {
never@3009 251 privileges = (getuid() != geteuid()) || (getgid() != getegid());
never@3009 252 init = true;
never@3009 253 }
never@3009 254 return privileges;
never@3009 255 }
never@3009 256
never@3009 257
never@3009 258 #ifndef _ALLBSD_SOURCE
never@3009 259 #ifndef SYS_gettid
never@3009 260 // i386: 224, ia64: 1105, amd64: 186, sparc 143
never@3009 261 #ifdef __ia64__
never@3009 262 #define SYS_gettid 1105
never@3009 263 #elif __i386__
never@3009 264 #define SYS_gettid 224
never@3009 265 #elif __amd64__
never@3009 266 #define SYS_gettid 186
never@3009 267 #elif __sparc__
never@3009 268 #define SYS_gettid 143
never@3009 269 #else
never@3009 270 #error define gettid for the arch
never@3009 271 #endif
never@3009 272 #endif
never@3009 273 #endif
never@3009 274
never@3009 275 // Cpu architecture string
never@3009 276 #if defined(ZERO)
never@3009 277 static char cpu_arch[] = ZERO_LIBARCH;
never@3009 278 #elif defined(IA64)
never@3009 279 static char cpu_arch[] = "ia64";
never@3009 280 #elif defined(IA32)
never@3009 281 static char cpu_arch[] = "i386";
never@3009 282 #elif defined(AMD64)
never@3009 283 static char cpu_arch[] = "amd64";
never@3009 284 #elif defined(ARM)
never@3009 285 static char cpu_arch[] = "arm";
never@3009 286 #elif defined(PPC)
never@3009 287 static char cpu_arch[] = "ppc";
never@3009 288 #elif defined(SPARC)
never@3009 289 # ifdef _LP64
never@3009 290 static char cpu_arch[] = "sparcv9";
never@3009 291 # else
never@3009 292 static char cpu_arch[] = "sparc";
never@3009 293 # endif
never@3009 294 #else
never@3009 295 #error Add appropriate cpu_arch setting
never@3009 296 #endif
never@3009 297
phh@3342 298 // Compiler variant
phh@3342 299 #ifdef COMPILER2
phh@3342 300 #define COMPILER_VARIANT "server"
phh@3342 301 #else
phh@3342 302 #define COMPILER_VARIANT "client"
phh@3342 303 #endif
never@3009 304
never@3009 305 #ifndef _ALLBSD_SOURCE
never@3009 306 // pid_t gettid()
never@3009 307 //
never@3009 308 // Returns the kernel thread id of the currently running thread. Kernel
never@3009 309 // thread id is used to access /proc.
never@3009 310 //
never@3009 311 // (Note that getpid() on BsdThreads returns kernel thread id too; but
never@3009 312 // on NPTL, it returns the same pid for all threads, as required by POSIX.)
never@3009 313 //
never@3009 314 pid_t os::Bsd::gettid() {
never@3009 315 int rslt = syscall(SYS_gettid);
never@3009 316 if (rslt == -1) {
never@3009 317 // old kernel, no NPTL support
never@3009 318 return getpid();
never@3009 319 } else {
never@3009 320 return (pid_t)rslt;
never@3009 321 }
never@3009 322 }
never@3009 323
never@3009 324 // Most versions of bsd have a bug where the number of processors are
never@3009 325 // determined by looking at the /proc file system. In a chroot environment,
never@3009 326 // the system call returns 1. This causes the VM to act as if it is
never@3009 327 // a single processor and elide locking (see is_MP() call).
never@3009 328 static bool unsafe_chroot_detected = false;
never@3009 329 static const char *unstable_chroot_error = "/proc file system not found.\n"
never@3009 330 "Java may be unstable running multithreaded in a chroot "
never@3009 331 "environment on Bsd when /proc filesystem is not mounted.";
never@3009 332 #endif
never@3009 333
never@3009 334 #ifdef _ALLBSD_SOURCE
never@3009 335 void os::Bsd::initialize_system_info() {
never@3009 336 int mib[2];
never@3009 337 size_t len;
never@3009 338 int cpu_val;
brutisso@4413 339 julong mem_val;
never@3009 340
never@3009 341 /* get processors count via hw.ncpus sysctl */
never@3009 342 mib[0] = CTL_HW;
never@3009 343 mib[1] = HW_NCPU;
never@3009 344 len = sizeof(cpu_val);
never@3009 345 if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {
brutisso@4413 346 assert(len == sizeof(cpu_val), "unexpected data size");
never@3009 347 set_processor_count(cpu_val);
never@3009 348 }
never@3009 349 else {
never@3009 350 set_processor_count(1); // fallback
never@3009 351 }
never@3009 352
brutisso@4413 353 /* get physical memory via hw.memsize sysctl (hw.memsize is used
brutisso@4413 354 * since it returns a 64 bit value)
never@3009 355 */
never@3009 356 mib[0] = CTL_HW;
brutisso@4413 357 mib[1] = HW_MEMSIZE;
never@3009 358 len = sizeof(mem_val);
brutisso@4413 359 if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {
brutisso@4413 360 assert(len == sizeof(mem_val), "unexpected data size");
never@3009 361 _physical_memory = mem_val;
brutisso@4413 362 } else {
never@3009 363 _physical_memory = 256*1024*1024; // fallback (XXXBSD?)
brutisso@4413 364 }
never@3009 365
never@3009 366 #ifdef __OpenBSD__
never@3009 367 {
never@3009 368 // limit _physical_memory memory view on OpenBSD since
never@3009 369 // datasize rlimit restricts us anyway.
never@3009 370 struct rlimit limits;
never@3009 371 getrlimit(RLIMIT_DATA, &limits);
never@3009 372 _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);
never@3009 373 }
never@3009 374 #endif
never@3009 375 }
never@3009 376 #else
never@3009 377 void os::Bsd::initialize_system_info() {
never@3009 378 set_processor_count(sysconf(_SC_NPROCESSORS_CONF));
never@3009 379 if (processor_count() == 1) {
never@3009 380 pid_t pid = os::Bsd::gettid();
never@3009 381 char fname[32];
never@3009 382 jio_snprintf(fname, sizeof(fname), "/proc/%d", pid);
never@3009 383 FILE *fp = fopen(fname, "r");
never@3009 384 if (fp == NULL) {
never@3009 385 unsafe_chroot_detected = true;
never@3009 386 } else {
never@3009 387 fclose(fp);
never@3009 388 }
never@3009 389 }
never@3009 390 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE);
never@3009 391 assert(processor_count() > 0, "bsd error");
never@3009 392 }
never@3009 393 #endif
never@3009 394
dcubed@3055 395 #ifdef __APPLE__
dcubed@3055 396 static const char *get_home() {
dcubed@3055 397 const char *home_dir = ::getenv("HOME");
dcubed@3055 398 if ((home_dir == NULL) || (*home_dir == '\0')) {
dcubed@3055 399 struct passwd *passwd_info = getpwuid(geteuid());
dcubed@3055 400 if (passwd_info != NULL) {
dcubed@3055 401 home_dir = passwd_info->pw_dir;
dcubed@3055 402 }
dcubed@3055 403 }
dcubed@3055 404
dcubed@3055 405 return home_dir;
dcubed@3055 406 }
dcubed@3055 407 #endif
dcubed@3055 408
never@3009 409 void os::init_system_properties_values() {
never@3009 410 // char arch[12];
never@3009 411 // sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));
never@3009 412
never@3009 413 // The next steps are taken in the product version:
never@3009 414 //
never@3009 415 // Obtain the JAVA_HOME value from the location of libjvm[_g].so.
never@3009 416 // This library should be located at:
never@3009 417 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so.
never@3009 418 //
never@3009 419 // If "/jre/lib/" appears at the right place in the path, then we
never@3009 420 // assume libjvm[_g].so is installed in a JDK and we use this path.
never@3009 421 //
never@3009 422 // Otherwise exit with message: "Could not create the Java virtual machine."
never@3009 423 //
never@3009 424 // The following extra steps are taken in the debugging version:
never@3009 425 //
never@3009 426 // If "/jre/lib/" does NOT appear at the right place in the path
never@3009 427 // instead of exit check for $JAVA_HOME environment variable.
never@3009 428 //
never@3009 429 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,
never@3009 430 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so
never@3009 431 // it looks like libjvm[_g].so is installed there
never@3009 432 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so.
never@3009 433 //
never@3009 434 // Otherwise exit.
never@3009 435 //
never@3009 436 // Important note: if the location of libjvm.so changes this
never@3009 437 // code needs to be changed accordingly.
never@3009 438
never@3009 439 // The next few definitions allow the code to be verbatim:
zgu@4135 440 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)
never@3009 441 #define getenv(n) ::getenv(n)
never@3009 442
never@3009 443 /*
never@3009 444 * See ld(1):
never@3009 445 * The linker uses the following search paths to locate required
never@3009 446 * shared libraries:
never@3009 447 * 1: ...
never@3009 448 * ...
never@3009 449 * 7: The default directories, normally /lib and /usr/lib.
never@3009 450 */
never@3009 451 #ifndef DEFAULT_LIBPATH
never@3009 452 #define DEFAULT_LIBPATH "/lib:/usr/lib"
never@3009 453 #endif
never@3009 454
never@3009 455 #define EXTENSIONS_DIR "/lib/ext"
never@3009 456 #define ENDORSED_DIR "/lib/endorsed"
never@3009 457 #define REG_DIR "/usr/java/packages"
never@3009 458
dcubed@3055 459 #ifdef __APPLE__
dcubed@3055 460 #define SYS_EXTENSIONS_DIR "/Library/Java/Extensions"
dcubed@3055 461 #define SYS_EXTENSIONS_DIRS SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"
dcubed@3055 462 const char *user_home_dir = get_home();
dcubed@3055 463 // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir
dcubed@3055 464 int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +
dcubed@3055 465 sizeof(SYS_EXTENSIONS_DIRS);
dcubed@3055 466 #endif
dcubed@3055 467
never@3009 468 {
never@3009 469 /* sysclasspath, java_home, dll_dir */
never@3009 470 {
never@3009 471 char *home_path;
never@3009 472 char *dll_path;
never@3009 473 char *pslash;
never@3009 474 char buf[MAXPATHLEN];
never@3009 475 os::jvm_path(buf, sizeof(buf));
never@3009 476
never@3009 477 // Found the full path to libjvm.so.
never@3009 478 // Now cut the path to <java_home>/jre if we can.
never@3009 479 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */
never@3009 480 pslash = strrchr(buf, '/');
never@3009 481 if (pslash != NULL)
never@3009 482 *pslash = '\0'; /* get rid of /{client|server|hotspot} */
never@3009 483 dll_path = malloc(strlen(buf) + 1);
never@3009 484 if (dll_path == NULL)
never@3009 485 return;
never@3009 486 strcpy(dll_path, buf);
never@3009 487 Arguments::set_dll_dir(dll_path);
never@3009 488
never@3009 489 if (pslash != NULL) {
never@3009 490 pslash = strrchr(buf, '/');
never@3009 491 if (pslash != NULL) {
dcubed@3055 492 *pslash = '\0'; /* get rid of /<arch> (/lib on macosx) */
dcubed@3055 493 #ifndef __APPLE__
never@3009 494 pslash = strrchr(buf, '/');
never@3009 495 if (pslash != NULL)
never@3009 496 *pslash = '\0'; /* get rid of /lib */
dcubed@3055 497 #endif
never@3009 498 }
never@3009 499 }
never@3009 500
never@3009 501 home_path = malloc(strlen(buf) + 1);
never@3009 502 if (home_path == NULL)
never@3009 503 return;
never@3009 504 strcpy(home_path, buf);
never@3009 505 Arguments::set_java_home(home_path);
never@3009 506
never@3009 507 if (!set_boot_path('/', ':'))
never@3009 508 return;
never@3009 509 }
never@3009 510
never@3009 511 /*
never@3009 512 * Where to look for native libraries
never@3009 513 *
never@3009 514 * Note: Due to a legacy implementation, most of the library path
never@3009 515 * is set in the launcher. This was to accomodate linking restrictions
never@3009 516 * on legacy Bsd implementations (which are no longer supported).
never@3009 517 * Eventually, all the library path setting will be done here.
never@3009 518 *
never@3009 519 * However, to prevent the proliferation of improperly built native
never@3009 520 * libraries, the new path component /usr/java/packages is added here.
never@3009 521 * Eventually, all the library path setting will be done here.
never@3009 522 */
never@3009 523 {
never@3009 524 char *ld_library_path;
never@3009 525
never@3009 526 /*
never@3009 527 * Construct the invariant part of ld_library_path. Note that the
never@3009 528 * space for the colon and the trailing null are provided by the
never@3009 529 * nulls included by the sizeof operator (so actually we allocate
never@3009 530 * a byte more than necessary).
never@3009 531 */
dcubed@3055 532 #ifdef __APPLE__
dcubed@3055 533 ld_library_path = (char *) malloc(system_ext_size);
dcubed@3055 534 sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir);
dcubed@3055 535 #else
never@3009 536 ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +
never@3009 537 strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));
never@3009 538 sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);
dcubed@3055 539 #endif
never@3009 540
never@3009 541 /*
never@3009 542 * Get the user setting of LD_LIBRARY_PATH, and prepended it. It
never@3009 543 * should always exist (until the legacy problem cited above is
never@3009 544 * addressed).
never@3009 545 */
never@3009 546 #ifdef __APPLE__
dcubed@3055 547 // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper
dcubed@3055 548 char *l = getenv("JAVA_LIBRARY_PATH");
dcubed@3055 549 if (l != NULL) {
dcubed@3055 550 char *t = ld_library_path;
dcubed@3055 551 /* That's +1 for the colon and +1 for the trailing '\0' */
dcubed@3055 552 ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1);
dcubed@3055 553 sprintf(ld_library_path, "%s:%s", l, t);
dcubed@3055 554 free(t);
dcubed@3055 555 }
dcubed@3055 556
never@3009 557 char *v = getenv("DYLD_LIBRARY_PATH");
never@3009 558 #else
never@3009 559 char *v = getenv("LD_LIBRARY_PATH");
never@3009 560 #endif
never@3009 561 if (v != NULL) {
never@3009 562 char *t = ld_library_path;
never@3009 563 /* That's +1 for the colon and +1 for the trailing '\0' */
never@3009 564 ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);
never@3009 565 sprintf(ld_library_path, "%s:%s", v, t);
dcubed@3055 566 free(t);
never@3009 567 }
dcubed@3506 568
dcubed@3506 569 #ifdef __APPLE__
dcubed@3506 570 // Apple's Java6 has "." at the beginning of java.library.path.
dcubed@3506 571 // OpenJDK on Windows has "." at the end of java.library.path.
dcubed@3506 572 // OpenJDK on Linux and Solaris don't have "." in java.library.path
dcubed@3506 573 // at all. To ease the transition from Apple's Java6 to OpenJDK7,
dcubed@3506 574 // "." is appended to the end of java.library.path. Yes, this
dcubed@3506 575 // could cause a change in behavior, but Apple's Java6 behavior
dcubed@3506 576 // can be achieved by putting "." at the beginning of the
dcubed@3506 577 // JAVA_LIBRARY_PATH environment variable.
dcubed@3506 578 {
dcubed@3506 579 char *t = ld_library_path;
dcubed@3506 580 // that's +3 for appending ":." and the trailing '\0'
dcubed@3506 581 ld_library_path = (char *) malloc(strlen(t) + 3);
dcubed@3506 582 sprintf(ld_library_path, "%s:%s", t, ".");
dcubed@3506 583 free(t);
dcubed@3506 584 }
dcubed@3506 585 #endif
dcubed@3506 586
never@3009 587 Arguments::set_library_path(ld_library_path);
never@3009 588 }
never@3009 589
never@3009 590 /*
never@3009 591 * Extensions directories.
never@3009 592 *
never@3009 593 * Note that the space for the colon and the trailing null are provided
never@3009 594 * by the nulls included by the sizeof operator (so actually one byte more
never@3009 595 * than necessary is allocated).
never@3009 596 */
never@3009 597 {
dcubed@3055 598 #ifdef __APPLE__
dcubed@3055 599 char *buf = malloc(strlen(Arguments::get_java_home()) +
dcubed@3055 600 sizeof(EXTENSIONS_DIR) + system_ext_size);
dcubed@3055 601 sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":"
dcubed@3055 602 SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home());
dcubed@3055 603 #else
never@3009 604 char *buf = malloc(strlen(Arguments::get_java_home()) +
never@3009 605 sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));
never@3009 606 sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,
never@3009 607 Arguments::get_java_home());
dcubed@3055 608 #endif
dcubed@3055 609
never@3009 610 Arguments::set_ext_dirs(buf);
never@3009 611 }
never@3009 612
never@3009 613 /* Endorsed standards default directory. */
never@3009 614 {
never@3009 615 char * buf;
never@3009 616 buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));
never@3009 617 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());
never@3009 618 Arguments::set_endorsed_dirs(buf);
never@3009 619 }
never@3009 620 }
never@3009 621
dcubed@3055 622 #ifdef __APPLE__
dcubed@3055 623 #undef SYS_EXTENSIONS_DIR
dcubed@3055 624 #endif
never@3009 625 #undef malloc
never@3009 626 #undef getenv
never@3009 627 #undef EXTENSIONS_DIR
never@3009 628 #undef ENDORSED_DIR
never@3009 629
never@3009 630 // Done
never@3009 631 return;
never@3009 632 }
never@3009 633
never@3009 634 ////////////////////////////////////////////////////////////////////////////////
never@3009 635 // breakpoint support
never@3009 636
never@3009 637 void os::breakpoint() {
never@3009 638 BREAKPOINT;
never@3009 639 }
never@3009 640
never@3009 641 extern "C" void breakpoint() {
never@3009 642 // use debugger to set breakpoint here
never@3009 643 }
never@3009 644
never@3009 645 ////////////////////////////////////////////////////////////////////////////////
never@3009 646 // signal support
never@3009 647
never@3009 648 debug_only(static bool signal_sets_initialized = false);
never@3009 649 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs;
never@3009 650
never@3009 651 bool os::Bsd::is_sig_ignored(int sig) {
never@3009 652 struct sigaction oact;
never@3009 653 sigaction(sig, (struct sigaction*)NULL, &oact);
never@3009 654 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
never@3009 655 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
never@3009 656 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN))
never@3009 657 return true;
never@3009 658 else
never@3009 659 return false;
never@3009 660 }
never@3009 661
never@3009 662 void os::Bsd::signal_sets_init() {
never@3009 663 // Should also have an assertion stating we are still single-threaded.
never@3009 664 assert(!signal_sets_initialized, "Already initialized");
never@3009 665 // Fill in signals that are necessarily unblocked for all threads in
never@3009 666 // the VM. Currently, we unblock the following signals:
never@3009 667 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
never@3009 668 // by -Xrs (=ReduceSignalUsage));
never@3009 669 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
never@3009 670 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
never@3009 671 // the dispositions or masks wrt these signals.
never@3009 672 // Programs embedding the VM that want to use the above signals for their
never@3009 673 // own purposes must, at this time, use the "-Xrs" option to prevent
never@3009 674 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
never@3009 675 // (See bug 4345157, and other related bugs).
never@3009 676 // In reality, though, unblocking these signals is really a nop, since
never@3009 677 // these signals are not blocked by default.
never@3009 678 sigemptyset(&unblocked_sigs);
never@3009 679 sigemptyset(&allowdebug_blocked_sigs);
never@3009 680 sigaddset(&unblocked_sigs, SIGILL);
never@3009 681 sigaddset(&unblocked_sigs, SIGSEGV);
never@3009 682 sigaddset(&unblocked_sigs, SIGBUS);
never@3009 683 sigaddset(&unblocked_sigs, SIGFPE);
never@3009 684 sigaddset(&unblocked_sigs, SR_signum);
never@3009 685
never@3009 686 if (!ReduceSignalUsage) {
never@3009 687 if (!os::Bsd::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
never@3009 688 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
never@3009 689 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL);
never@3009 690 }
never@3009 691 if (!os::Bsd::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
never@3009 692 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
never@3009 693 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL);
never@3009 694 }
never@3009 695 if (!os::Bsd::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
never@3009 696 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
never@3009 697 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL);
never@3009 698 }
never@3009 699 }
never@3009 700 // Fill in signals that are blocked by all but the VM thread.
never@3009 701 sigemptyset(&vm_sigs);
never@3009 702 if (!ReduceSignalUsage)
never@3009 703 sigaddset(&vm_sigs, BREAK_SIGNAL);
never@3009 704 debug_only(signal_sets_initialized = true);
never@3009 705
never@3009 706 }
never@3009 707
never@3009 708 // These are signals that are unblocked while a thread is running Java.
never@3009 709 // (For some reason, they get blocked by default.)
never@3009 710 sigset_t* os::Bsd::unblocked_signals() {
never@3009 711 assert(signal_sets_initialized, "Not initialized");
never@3009 712 return &unblocked_sigs;
never@3009 713 }
never@3009 714
never@3009 715 // These are the signals that are blocked while a (non-VM) thread is
never@3009 716 // running Java. Only the VM thread handles these signals.
never@3009 717 sigset_t* os::Bsd::vm_signals() {
never@3009 718 assert(signal_sets_initialized, "Not initialized");
never@3009 719 return &vm_sigs;
never@3009 720 }
never@3009 721
never@3009 722 // These are signals that are blocked during cond_wait to allow debugger in
never@3009 723 sigset_t* os::Bsd::allowdebug_blocked_signals() {
never@3009 724 assert(signal_sets_initialized, "Not initialized");
never@3009 725 return &allowdebug_blocked_sigs;
never@3009 726 }
never@3009 727
never@3009 728 void os::Bsd::hotspot_sigmask(Thread* thread) {
never@3009 729
never@3009 730 //Save caller's signal mask before setting VM signal mask
never@3009 731 sigset_t caller_sigmask;
never@3009 732 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
never@3009 733
never@3009 734 OSThread* osthread = thread->osthread();
never@3009 735 osthread->set_caller_sigmask(caller_sigmask);
never@3009 736
never@3009 737 pthread_sigmask(SIG_UNBLOCK, os::Bsd::unblocked_signals(), NULL);
never@3009 738
never@3009 739 if (!ReduceSignalUsage) {
never@3009 740 if (thread->is_VM_thread()) {
never@3009 741 // Only the VM thread handles BREAK_SIGNAL ...
never@3009 742 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
never@3009 743 } else {
never@3009 744 // ... all other threads block BREAK_SIGNAL
never@3009 745 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
never@3009 746 }
never@3009 747 }
never@3009 748 }
never@3009 749
never@3009 750 #ifndef _ALLBSD_SOURCE
never@3009 751 //////////////////////////////////////////////////////////////////////////////
never@3009 752 // detecting pthread library
never@3009 753
never@3009 754 void os::Bsd::libpthread_init() {
never@3009 755 // Save glibc and pthread version strings. Note that _CS_GNU_LIBC_VERSION
never@3009 756 // and _CS_GNU_LIBPTHREAD_VERSION are supported in glibc >= 2.3.2. Use a
never@3009 757 // generic name for earlier versions.
never@3009 758 // Define macros here so we can build HotSpot on old systems.
never@3009 759 # ifndef _CS_GNU_LIBC_VERSION
never@3009 760 # define _CS_GNU_LIBC_VERSION 2
never@3009 761 # endif
never@3009 762 # ifndef _CS_GNU_LIBPTHREAD_VERSION
never@3009 763 # define _CS_GNU_LIBPTHREAD_VERSION 3
never@3009 764 # endif
never@3009 765
never@3009 766 size_t n = confstr(_CS_GNU_LIBC_VERSION, NULL, 0);
never@3009 767 if (n > 0) {
never@3009 768 char *str = (char *)malloc(n);
never@3009 769 confstr(_CS_GNU_LIBC_VERSION, str, n);
never@3009 770 os::Bsd::set_glibc_version(str);
never@3009 771 } else {
never@3009 772 // _CS_GNU_LIBC_VERSION is not supported, try gnu_get_libc_version()
never@3009 773 static char _gnu_libc_version[32];
never@3009 774 jio_snprintf(_gnu_libc_version, sizeof(_gnu_libc_version),
never@3009 775 "glibc %s %s", gnu_get_libc_version(), gnu_get_libc_release());
never@3009 776 os::Bsd::set_glibc_version(_gnu_libc_version);
never@3009 777 }
never@3009 778
never@3009 779 n = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, 0);
never@3009 780 if (n > 0) {
never@3009 781 char *str = (char *)malloc(n);
never@3009 782 confstr(_CS_GNU_LIBPTHREAD_VERSION, str, n);
never@3009 783 // Vanilla RH-9 (glibc 2.3.2) has a bug that confstr() always tells
never@3009 784 // us "NPTL-0.29" even we are running with BsdThreads. Check if this
never@3009 785 // is the case. BsdThreads has a hard limit on max number of threads.
never@3009 786 // So sysconf(_SC_THREAD_THREADS_MAX) will return a positive value.
never@3009 787 // On the other hand, NPTL does not have such a limit, sysconf()
never@3009 788 // will return -1 and errno is not changed. Check if it is really NPTL.
never@3009 789 if (strcmp(os::Bsd::glibc_version(), "glibc 2.3.2") == 0 &&
never@3009 790 strstr(str, "NPTL") &&
never@3009 791 sysconf(_SC_THREAD_THREADS_MAX) > 0) {
never@3009 792 free(str);
never@3009 793 os::Bsd::set_libpthread_version("bsdthreads");
never@3009 794 } else {
never@3009 795 os::Bsd::set_libpthread_version(str);
never@3009 796 }
never@3009 797 } else {
never@3009 798 // glibc before 2.3.2 only has BsdThreads.
never@3009 799 os::Bsd::set_libpthread_version("bsdthreads");
never@3009 800 }
never@3009 801
never@3009 802 if (strstr(libpthread_version(), "NPTL")) {
never@3009 803 os::Bsd::set_is_NPTL();
never@3009 804 } else {
never@3009 805 os::Bsd::set_is_BsdThreads();
never@3009 806 }
never@3009 807
never@3009 808 // BsdThreads have two flavors: floating-stack mode, which allows variable
never@3009 809 // stack size; and fixed-stack mode. NPTL is always floating-stack.
never@3009 810 if (os::Bsd::is_NPTL() || os::Bsd::supports_variable_stack_size()) {
never@3009 811 os::Bsd::set_is_floating_stack();
never@3009 812 }
never@3009 813 }
never@3009 814
never@3009 815 /////////////////////////////////////////////////////////////////////////////
never@3009 816 // thread stack
never@3009 817
never@3009 818 // Force Bsd kernel to expand current thread stack. If "bottom" is close
never@3009 819 // to the stack guard, caller should block all signals.
never@3009 820 //
never@3009 821 // MAP_GROWSDOWN:
never@3009 822 // A special mmap() flag that is used to implement thread stacks. It tells
never@3009 823 // kernel that the memory region should extend downwards when needed. This
never@3009 824 // allows early versions of BsdThreads to only mmap the first few pages
never@3009 825 // when creating a new thread. Bsd kernel will automatically expand thread
never@3009 826 // stack as needed (on page faults).
never@3009 827 //
never@3009 828 // However, because the memory region of a MAP_GROWSDOWN stack can grow on
never@3009 829 // demand, if a page fault happens outside an already mapped MAP_GROWSDOWN
never@3009 830 // region, it's hard to tell if the fault is due to a legitimate stack
never@3009 831 // access or because of reading/writing non-exist memory (e.g. buffer
never@3009 832 // overrun). As a rule, if the fault happens below current stack pointer,
never@3009 833 // Bsd kernel does not expand stack, instead a SIGSEGV is sent to the
never@3009 834 // application (see Bsd kernel fault.c).
never@3009 835 //
never@3009 836 // This Bsd feature can cause SIGSEGV when VM bangs thread stack for
never@3009 837 // stack overflow detection.
never@3009 838 //
never@3009 839 // Newer version of BsdThreads (since glibc-2.2, or, RH-7.x) and NPTL do
never@3009 840 // not use this flag. However, the stack of initial thread is not created
never@3009 841 // by pthread, it is still MAP_GROWSDOWN. Also it's possible (though
never@3009 842 // unlikely) that user code can create a thread with MAP_GROWSDOWN stack
never@3009 843 // and then attach the thread to JVM.
never@3009 844 //
never@3009 845 // To get around the problem and allow stack banging on Bsd, we need to
never@3009 846 // manually expand thread stack after receiving the SIGSEGV.
never@3009 847 //
never@3009 848 // There are two ways to expand thread stack to address "bottom", we used
never@3009 849 // both of them in JVM before 1.5:
never@3009 850 // 1. adjust stack pointer first so that it is below "bottom", and then
never@3009 851 // touch "bottom"
never@3009 852 // 2. mmap() the page in question
never@3009 853 //
never@3009 854 // Now alternate signal stack is gone, it's harder to use 2. For instance,
never@3009 855 // if current sp is already near the lower end of page 101, and we need to
never@3009 856 // call mmap() to map page 100, it is possible that part of the mmap() frame
never@3009 857 // will be placed in page 100. When page 100 is mapped, it is zero-filled.
never@3009 858 // That will destroy the mmap() frame and cause VM to crash.
never@3009 859 //
never@3009 860 // The following code works by adjusting sp first, then accessing the "bottom"
never@3009 861 // page to force a page fault. Bsd kernel will then automatically expand the
never@3009 862 // stack mapping.
never@3009 863 //
never@3009 864 // _expand_stack_to() assumes its frame size is less than page size, which
never@3009 865 // should always be true if the function is not inlined.
never@3009 866
never@3009 867 #if __GNUC__ < 3 // gcc 2.x does not support noinline attribute
never@3009 868 #define NOINLINE
never@3009 869 #else
never@3009 870 #define NOINLINE __attribute__ ((noinline))
never@3009 871 #endif
never@3009 872
never@3009 873 static void _expand_stack_to(address bottom) NOINLINE;
never@3009 874
never@3009 875 static void _expand_stack_to(address bottom) {
never@3009 876 address sp;
never@3009 877 size_t size;
never@3009 878 volatile char *p;
never@3009 879
never@3009 880 // Adjust bottom to point to the largest address within the same page, it
never@3009 881 // gives us a one-page buffer if alloca() allocates slightly more memory.
never@3009 882 bottom = (address)align_size_down((uintptr_t)bottom, os::Bsd::page_size());
never@3009 883 bottom += os::Bsd::page_size() - 1;
never@3009 884
never@3009 885 // sp might be slightly above current stack pointer; if that's the case, we
never@3009 886 // will alloca() a little more space than necessary, which is OK. Don't use
never@3009 887 // os::current_stack_pointer(), as its result can be slightly below current
never@3009 888 // stack pointer, causing us to not alloca enough to reach "bottom".
never@3009 889 sp = (address)&sp;
never@3009 890
never@3009 891 if (sp > bottom) {
never@3009 892 size = sp - bottom;
never@3009 893 p = (volatile char *)alloca(size);
never@3009 894 assert(p != NULL && p <= (volatile char *)bottom, "alloca problem?");
never@3009 895 p[0] = '\0';
never@3009 896 }
never@3009 897 }
never@3009 898
never@3009 899 bool os::Bsd::manually_expand_stack(JavaThread * t, address addr) {
never@3009 900 assert(t!=NULL, "just checking");
never@3009 901 assert(t->osthread()->expanding_stack(), "expand should be set");
never@3009 902 assert(t->stack_base() != NULL, "stack_base was not initialized");
never@3009 903
never@3009 904 if (addr < t->stack_base() && addr >= t->stack_yellow_zone_base()) {
never@3009 905 sigset_t mask_all, old_sigset;
never@3009 906 sigfillset(&mask_all);
never@3009 907 pthread_sigmask(SIG_SETMASK, &mask_all, &old_sigset);
never@3009 908 _expand_stack_to(addr);
never@3009 909 pthread_sigmask(SIG_SETMASK, &old_sigset, NULL);
never@3009 910 return true;
never@3009 911 }
never@3009 912 return false;
never@3009 913 }
never@3009 914 #endif
never@3009 915
never@3009 916 //////////////////////////////////////////////////////////////////////////////
never@3009 917 // create new thread
never@3009 918
never@3009 919 static address highest_vm_reserved_address();
never@3009 920
never@3009 921 // check if it's safe to start a new thread
never@3009 922 static bool _thread_safety_check(Thread* thread) {
never@3009 923 #ifdef _ALLBSD_SOURCE
never@3009 924 return true;
never@3009 925 #else
never@3009 926 if (os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack()) {
never@3009 927 // Fixed stack BsdThreads (SuSE Bsd/x86, and some versions of Redhat)
never@3009 928 // Heap is mmap'ed at lower end of memory space. Thread stacks are
never@3009 929 // allocated (MAP_FIXED) from high address space. Every thread stack
never@3009 930 // occupies a fixed size slot (usually 2Mbytes, but user can change
never@3009 931 // it to other values if they rebuild BsdThreads).
never@3009 932 //
never@3009 933 // Problem with MAP_FIXED is that mmap() can still succeed even part of
never@3009 934 // the memory region has already been mmap'ed. That means if we have too
never@3009 935 // many threads and/or very large heap, eventually thread stack will
never@3009 936 // collide with heap.
never@3009 937 //
never@3009 938 // Here we try to prevent heap/stack collision by comparing current
never@3009 939 // stack bottom with the highest address that has been mmap'ed by JVM
never@3009 940 // plus a safety margin for memory maps created by native code.
never@3009 941 //
never@3009 942 // This feature can be disabled by setting ThreadSafetyMargin to 0
never@3009 943 //
never@3009 944 if (ThreadSafetyMargin > 0) {
never@3009 945 address stack_bottom = os::current_stack_base() - os::current_stack_size();
never@3009 946
never@3009 947 // not safe if our stack extends below the safety margin
never@3009 948 return stack_bottom - ThreadSafetyMargin >= highest_vm_reserved_address();
never@3009 949 } else {
never@3009 950 return true;
never@3009 951 }
never@3009 952 } else {
never@3009 953 // Floating stack BsdThreads or NPTL:
never@3009 954 // Unlike fixed stack BsdThreads, thread stacks are not MAP_FIXED. When
never@3009 955 // there's not enough space left, pthread_create() will fail. If we come
never@3009 956 // here, that means enough space has been reserved for stack.
never@3009 957 return true;
never@3009 958 }
never@3009 959 #endif
never@3009 960 }
never@3009 961
dcubed@3055 962 #ifdef __APPLE__
dcubed@3055 963 // library handle for calling objc_registerThreadWithCollector()
dcubed@3055 964 // without static linking to the libobjc library
dcubed@3055 965 #define OBJC_LIB "/usr/lib/libobjc.dylib"
dcubed@3055 966 #define OBJC_GCREGISTER "objc_registerThreadWithCollector"
dcubed@3055 967 typedef void (*objc_registerThreadWithCollector_t)();
dcubed@3055 968 extern "C" objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction;
dcubed@3055 969 objc_registerThreadWithCollector_t objc_registerThreadWithCollectorFunction = NULL;
dcubed@3055 970 #endif
dcubed@3055 971
never@3009 972 // Thread start routine for all newly created threads
never@3009 973 static void *java_start(Thread *thread) {
never@3009 974 // Try to randomize the cache line index of hot stack frames.
never@3009 975 // This helps when threads of the same stack traces evict each other's
never@3009 976 // cache lines. The threads can be either from the same JVM instance, or
never@3009 977 // from different JVM instances. The benefit is especially true for
never@3009 978 // processors with hyperthreading technology.
never@3009 979 static int counter = 0;
never@3009 980 int pid = os::current_process_id();
never@3009 981 alloca(((pid ^ counter++) & 7) * 128);
never@3009 982
never@3009 983 ThreadLocalStorage::set_thread(thread);
never@3009 984
never@3009 985 OSThread* osthread = thread->osthread();
never@3009 986 Monitor* sync = osthread->startThread_lock();
never@3009 987
never@3009 988 // non floating stack BsdThreads needs extra check, see above
never@3009 989 if (!_thread_safety_check(thread)) {
never@3009 990 // notify parent thread
never@3009 991 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
never@3009 992 osthread->set_state(ZOMBIE);
never@3009 993 sync->notify_all();
never@3009 994 return NULL;
never@3009 995 }
never@3009 996
never@3009 997 #ifdef _ALLBSD_SOURCE
sla@3544 998 #ifdef __APPLE__
sla@3544 999 // thread_id is mach thread on macos
sla@3544 1000 osthread->set_thread_id(::mach_thread_self());
sla@3544 1001 #else
never@3009 1002 // thread_id is pthread_id on BSD
never@3009 1003 osthread->set_thread_id(::pthread_self());
sla@3544 1004 #endif
never@3009 1005 #else
never@3009 1006 // thread_id is kernel thread id (similar to Solaris LWP id)
never@3009 1007 osthread->set_thread_id(os::Bsd::gettid());
never@3009 1008
never@3009 1009 if (UseNUMA) {
never@3009 1010 int lgrp_id = os::numa_get_group_id();
never@3009 1011 if (lgrp_id != -1) {
never@3009 1012 thread->set_lgrp_id(lgrp_id);
never@3009 1013 }
never@3009 1014 }
never@3009 1015 #endif
never@3009 1016 // initialize signal mask for this thread
never@3009 1017 os::Bsd::hotspot_sigmask(thread);
never@3009 1018
never@3009 1019 // initialize floating point control register
never@3009 1020 os::Bsd::init_thread_fpu_state();
never@3009 1021
dcubed@3055 1022 #ifdef __APPLE__
dcubed@3055 1023 // register thread with objc gc
dcubed@3055 1024 if (objc_registerThreadWithCollectorFunction != NULL) {
dcubed@3055 1025 objc_registerThreadWithCollectorFunction();
dcubed@3055 1026 }
dcubed@3055 1027 #endif
dcubed@3055 1028
never@3009 1029 // handshaking with parent thread
never@3009 1030 {
never@3009 1031 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
never@3009 1032
never@3009 1033 // notify parent thread
never@3009 1034 osthread->set_state(INITIALIZED);
never@3009 1035 sync->notify_all();
never@3009 1036
never@3009 1037 // wait until os::start_thread()
never@3009 1038 while (osthread->get_state() == INITIALIZED) {
never@3009 1039 sync->wait(Mutex::_no_safepoint_check_flag);
never@3009 1040 }
never@3009 1041 }
never@3009 1042
never@3009 1043 // call one more level start routine
never@3009 1044 thread->run();
never@3009 1045
never@3009 1046 return 0;
never@3009 1047 }
never@3009 1048
never@3009 1049 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) {
never@3009 1050 assert(thread->osthread() == NULL, "caller responsible");
never@3009 1051
never@3009 1052 // Allocate the OSThread object
never@3009 1053 OSThread* osthread = new OSThread(NULL, NULL);
never@3009 1054 if (osthread == NULL) {
never@3009 1055 return false;
never@3009 1056 }
never@3009 1057
never@3009 1058 // set the correct thread state
never@3009 1059 osthread->set_thread_type(thr_type);
never@3009 1060
never@3009 1061 // Initial state is ALLOCATED but not INITIALIZED
never@3009 1062 osthread->set_state(ALLOCATED);
never@3009 1063
never@3009 1064 thread->set_osthread(osthread);
never@3009 1065
never@3009 1066 // init thread attributes
never@3009 1067 pthread_attr_t attr;
never@3009 1068 pthread_attr_init(&attr);
never@3009 1069 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
never@3009 1070
never@3009 1071 // stack size
never@3009 1072 if (os::Bsd::supports_variable_stack_size()) {
never@3009 1073 // calculate stack size if it's not specified by caller
never@3009 1074 if (stack_size == 0) {
never@3009 1075 stack_size = os::Bsd::default_stack_size(thr_type);
never@3009 1076
never@3009 1077 switch (thr_type) {
never@3009 1078 case os::java_thread:
never@3009 1079 // Java threads use ThreadStackSize which default value can be
never@3009 1080 // changed with the flag -Xss
never@3009 1081 assert (JavaThread::stack_size_at_create() > 0, "this should be set");
never@3009 1082 stack_size = JavaThread::stack_size_at_create();
never@3009 1083 break;
never@3009 1084 case os::compiler_thread:
never@3009 1085 if (CompilerThreadStackSize > 0) {
never@3009 1086 stack_size = (size_t)(CompilerThreadStackSize * K);
never@3009 1087 break;
never@3009 1088 } // else fall through:
never@3009 1089 // use VMThreadStackSize if CompilerThreadStackSize is not defined
never@3009 1090 case os::vm_thread:
never@3009 1091 case os::pgc_thread:
never@3009 1092 case os::cgc_thread:
never@3009 1093 case os::watcher_thread:
never@3009 1094 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K);
never@3009 1095 break;
never@3009 1096 }
never@3009 1097 }
never@3009 1098
never@3009 1099 stack_size = MAX2(stack_size, os::Bsd::min_stack_allowed);
never@3009 1100 pthread_attr_setstacksize(&attr, stack_size);
never@3009 1101 } else {
never@3009 1102 // let pthread_create() pick the default value.
never@3009 1103 }
never@3009 1104
never@3009 1105 #ifndef _ALLBSD_SOURCE
never@3009 1106 // glibc guard page
never@3009 1107 pthread_attr_setguardsize(&attr, os::Bsd::default_guard_size(thr_type));
never@3009 1108 #endif
never@3009 1109
never@3009 1110 ThreadState state;
never@3009 1111
never@3009 1112 {
never@3009 1113
never@3009 1114 #ifndef _ALLBSD_SOURCE
never@3009 1115 // Serialize thread creation if we are running with fixed stack BsdThreads
never@3009 1116 bool lock = os::Bsd::is_BsdThreads() && !os::Bsd::is_floating_stack();
never@3009 1117 if (lock) {
never@3009 1118 os::Bsd::createThread_lock()->lock_without_safepoint_check();
never@3009 1119 }
never@3009 1120 #endif
never@3009 1121
never@3009 1122 pthread_t tid;
never@3009 1123 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) java_start, thread);
never@3009 1124
never@3009 1125 pthread_attr_destroy(&attr);
never@3009 1126
never@3009 1127 if (ret != 0) {
never@3009 1128 if (PrintMiscellaneous && (Verbose || WizardMode)) {
never@3009 1129 perror("pthread_create()");
never@3009 1130 }
never@3009 1131 // Need to clean up stuff we've allocated so far
never@3009 1132 thread->set_osthread(NULL);
never@3009 1133 delete osthread;
never@3009 1134 #ifndef _ALLBSD_SOURCE
never@3009 1135 if (lock) os::Bsd::createThread_lock()->unlock();
never@3009 1136 #endif
never@3009 1137 return false;
never@3009 1138 }
never@3009 1139
never@3009 1140 // Store pthread info into the OSThread
never@3009 1141 osthread->set_pthread_id(tid);
never@3009 1142
never@3009 1143 // Wait until child thread is either initialized or aborted
never@3009 1144 {
never@3009 1145 Monitor* sync_with_child = osthread->startThread_lock();
never@3009 1146 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
never@3009 1147 while ((state = osthread->get_state()) == ALLOCATED) {
never@3009 1148 sync_with_child->wait(Mutex::_no_safepoint_check_flag);
never@3009 1149 }
never@3009 1150 }
never@3009 1151
never@3009 1152 #ifndef _ALLBSD_SOURCE
never@3009 1153 if (lock) {
never@3009 1154 os::Bsd::createThread_lock()->unlock();
never@3009 1155 }
never@3009 1156 #endif
never@3009 1157 }
never@3009 1158
never@3009 1159 // Aborted due to thread limit being reached
never@3009 1160 if (state == ZOMBIE) {
never@3009 1161 thread->set_osthread(NULL);
never@3009 1162 delete osthread;
never@3009 1163 return false;
never@3009 1164 }
never@3009 1165
never@3009 1166 // The thread is returned suspended (in state INITIALIZED),
never@3009 1167 // and is started higher up in the call chain
never@3009 1168 assert(state == INITIALIZED, "race condition");
never@3009 1169 return true;
never@3009 1170 }
never@3009 1171
never@3009 1172 /////////////////////////////////////////////////////////////////////////////
never@3009 1173 // attach existing thread
never@3009 1174
never@3009 1175 // bootstrap the main thread
never@3009 1176 bool os::create_main_thread(JavaThread* thread) {
never@3009 1177 assert(os::Bsd::_main_thread == pthread_self(), "should be called inside main thread");
never@3009 1178 return create_attached_thread(thread);
never@3009 1179 }
never@3009 1180
never@3009 1181 bool os::create_attached_thread(JavaThread* thread) {
never@3009 1182 #ifdef ASSERT
never@3009 1183 thread->verify_not_published();
never@3009 1184 #endif
never@3009 1185
never@3009 1186 // Allocate the OSThread object
never@3009 1187 OSThread* osthread = new OSThread(NULL, NULL);
never@3009 1188
never@3009 1189 if (osthread == NULL) {
never@3009 1190 return false;
never@3009 1191 }
never@3009 1192
never@3009 1193 // Store pthread info into the OSThread
never@3009 1194 #ifdef _ALLBSD_SOURCE
sla@3544 1195 #ifdef __APPLE__
sla@3544 1196 osthread->set_thread_id(::mach_thread_self());
sla@3544 1197 #else
never@3009 1198 osthread->set_thread_id(::pthread_self());
sla@3544 1199 #endif
never@3009 1200 #else
never@3009 1201 osthread->set_thread_id(os::Bsd::gettid());
never@3009 1202 #endif
never@3009 1203 osthread->set_pthread_id(::pthread_self());
never@3009 1204
never@3009 1205 // initialize floating point control register
never@3009 1206 os::Bsd::init_thread_fpu_state();
never@3009 1207
never@3009 1208 // Initial thread state is RUNNABLE
never@3009 1209 osthread->set_state(RUNNABLE);
never@3009 1210
never@3009 1211 thread->set_osthread(osthread);
never@3009 1212
never@3009 1213 #ifndef _ALLBSD_SOURCE
never@3009 1214 if (UseNUMA) {
never@3009 1215 int lgrp_id = os::numa_get_group_id();
never@3009 1216 if (lgrp_id != -1) {
never@3009 1217 thread->set_lgrp_id(lgrp_id);
never@3009 1218 }
never@3009 1219 }
never@3009 1220
never@3009 1221 if (os::Bsd::is_initial_thread()) {
never@3009 1222 // If current thread is initial thread, its stack is mapped on demand,
never@3009 1223 // see notes about MAP_GROWSDOWN. Here we try to force kernel to map
never@3009 1224 // the entire stack region to avoid SEGV in stack banging.
never@3009 1225 // It is also useful to get around the heap-stack-gap problem on SuSE
never@3009 1226 // kernel (see 4821821 for details). We first expand stack to the top
never@3009 1227 // of yellow zone, then enable stack yellow zone (order is significant,
never@3009 1228 // enabling yellow zone first will crash JVM on SuSE Bsd), so there
never@3009 1229 // is no gap between the last two virtual memory regions.
never@3009 1230
never@3009 1231 JavaThread *jt = (JavaThread *)thread;
never@3009 1232 address addr = jt->stack_yellow_zone_base();
never@3009 1233 assert(addr != NULL, "initialization problem?");
never@3009 1234 assert(jt->stack_available(addr) > 0, "stack guard should not be enabled");
never@3009 1235
never@3009 1236 osthread->set_expanding_stack();
never@3009 1237 os::Bsd::manually_expand_stack(jt, addr);
never@3009 1238 osthread->clear_expanding_stack();
never@3009 1239 }
never@3009 1240 #endif
never@3009 1241
never@3009 1242 // initialize signal mask for this thread
never@3009 1243 // and save the caller's signal mask
never@3009 1244 os::Bsd::hotspot_sigmask(thread);
never@3009 1245
never@3009 1246 return true;
never@3009 1247 }
never@3009 1248
never@3009 1249 void os::pd_start_thread(Thread* thread) {
never@3009 1250 OSThread * osthread = thread->osthread();
never@3009 1251 assert(osthread->get_state() != INITIALIZED, "just checking");
never@3009 1252 Monitor* sync_with_child = osthread->startThread_lock();
never@3009 1253 MutexLockerEx ml(sync_with_child, Mutex::_no_safepoint_check_flag);
never@3009 1254 sync_with_child->notify();
never@3009 1255 }
never@3009 1256
never@3009 1257 // Free Bsd resources related to the OSThread
never@3009 1258 void os::free_thread(OSThread* osthread) {
never@3009 1259 assert(osthread != NULL, "osthread not set");
never@3009 1260
never@3009 1261 if (Thread::current()->osthread() == osthread) {
never@3009 1262 // Restore caller's signal mask
never@3009 1263 sigset_t sigmask = osthread->caller_sigmask();
never@3009 1264 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
never@3009 1265 }
never@3009 1266
never@3009 1267 delete osthread;
never@3009 1268 }
never@3009 1269
never@3009 1270 //////////////////////////////////////////////////////////////////////////////
never@3009 1271 // thread local storage
never@3009 1272
never@3009 1273 int os::allocate_thread_local_storage() {
never@3009 1274 pthread_key_t key;
never@3009 1275 int rslt = pthread_key_create(&key, NULL);
never@3009 1276 assert(rslt == 0, "cannot allocate thread local storage");
never@3009 1277 return (int)key;
never@3009 1278 }
never@3009 1279
never@3009 1280 // Note: This is currently not used by VM, as we don't destroy TLS key
never@3009 1281 // on VM exit.
never@3009 1282 void os::free_thread_local_storage(int index) {
never@3009 1283 int rslt = pthread_key_delete((pthread_key_t)index);
never@3009 1284 assert(rslt == 0, "invalid index");
never@3009 1285 }
never@3009 1286
never@3009 1287 void os::thread_local_storage_at_put(int index, void* value) {
never@3009 1288 int rslt = pthread_setspecific((pthread_key_t)index, value);
never@3009 1289 assert(rslt == 0, "pthread_setspecific failed");
never@3009 1290 }
never@3009 1291
never@3009 1292 extern "C" Thread* get_thread() {
never@3009 1293 return ThreadLocalStorage::thread();
never@3009 1294 }
never@3009 1295
never@3009 1296 //////////////////////////////////////////////////////////////////////////////
never@3009 1297 // initial thread
never@3009 1298
never@3009 1299 #ifndef _ALLBSD_SOURCE
never@3009 1300 // Check if current thread is the initial thread, similar to Solaris thr_main.
never@3009 1301 bool os::Bsd::is_initial_thread(void) {
never@3009 1302 char dummy;
never@3009 1303 // If called before init complete, thread stack bottom will be null.
never@3009 1304 // Can be called if fatal error occurs before initialization.
never@3009 1305 if (initial_thread_stack_bottom() == NULL) return false;
never@3009 1306 assert(initial_thread_stack_bottom() != NULL &&
never@3009 1307 initial_thread_stack_size() != 0,
never@3009 1308 "os::init did not locate initial thread's stack region");
never@3009 1309 if ((address)&dummy >= initial_thread_stack_bottom() &&
never@3009 1310 (address)&dummy < initial_thread_stack_bottom() + initial_thread_stack_size())
never@3009 1311 return true;
never@3009 1312 else return false;
never@3009 1313 }
never@3009 1314
never@3009 1315 // Find the virtual memory area that contains addr
never@3009 1316 static bool find_vma(address addr, address* vma_low, address* vma_high) {
never@3009 1317 FILE *fp = fopen("/proc/self/maps", "r");
never@3009 1318 if (fp) {
never@3009 1319 address low, high;
never@3009 1320 while (!feof(fp)) {
never@3009 1321 if (fscanf(fp, "%p-%p", &low, &high) == 2) {
never@3009 1322 if (low <= addr && addr < high) {
never@3009 1323 if (vma_low) *vma_low = low;
never@3009 1324 if (vma_high) *vma_high = high;
never@3009 1325 fclose (fp);
never@3009 1326 return true;
never@3009 1327 }
never@3009 1328 }
never@3009 1329 for (;;) {
never@3009 1330 int ch = fgetc(fp);
never@3009 1331 if (ch == EOF || ch == (int)'\n') break;
never@3009 1332 }
never@3009 1333 }
never@3009 1334 fclose(fp);
never@3009 1335 }
never@3009 1336 return false;
never@3009 1337 }
never@3009 1338
never@3009 1339 // Locate initial thread stack. This special handling of initial thread stack
never@3009 1340 // is needed because pthread_getattr_np() on most (all?) Bsd distros returns
never@3009 1341 // bogus value for initial thread.
never@3009 1342 void os::Bsd::capture_initial_stack(size_t max_size) {
never@3009 1343 // stack size is the easy part, get it from RLIMIT_STACK
never@3009 1344 size_t stack_size;
never@3009 1345 struct rlimit rlim;
never@3009 1346 getrlimit(RLIMIT_STACK, &rlim);
never@3009 1347 stack_size = rlim.rlim_cur;
never@3009 1348
never@3009 1349 // 6308388: a bug in ld.so will relocate its own .data section to the
never@3009 1350 // lower end of primordial stack; reduce ulimit -s value a little bit
never@3009 1351 // so we won't install guard page on ld.so's data section.
never@3009 1352 stack_size -= 2 * page_size();
never@3009 1353
never@3009 1354 // 4441425: avoid crash with "unlimited" stack size on SuSE 7.1 or Redhat
never@3009 1355 // 7.1, in both cases we will get 2G in return value.
never@3009 1356 // 4466587: glibc 2.2.x compiled w/o "--enable-kernel=2.4.0" (RH 7.0,
never@3009 1357 // SuSE 7.2, Debian) can not handle alternate signal stack correctly
never@3009 1358 // for initial thread if its stack size exceeds 6M. Cap it at 2M,
never@3009 1359 // in case other parts in glibc still assumes 2M max stack size.
never@3009 1360 // FIXME: alt signal stack is gone, maybe we can relax this constraint?
never@3009 1361 #ifndef IA64
never@3009 1362 if (stack_size > 2 * K * K) stack_size = 2 * K * K;
never@3009 1363 #else
never@3009 1364 // Problem still exists RH7.2 (IA64 anyway) but 2MB is a little small
never@3009 1365 if (stack_size > 4 * K * K) stack_size = 4 * K * K;
never@3009 1366 #endif
never@3009 1367
never@3009 1368 // Try to figure out where the stack base (top) is. This is harder.
never@3009 1369 //
never@3009 1370 // When an application is started, glibc saves the initial stack pointer in
never@3009 1371 // a global variable "__libc_stack_end", which is then used by system
never@3009 1372 // libraries. __libc_stack_end should be pretty close to stack top. The
never@3009 1373 // variable is available since the very early days. However, because it is
never@3009 1374 // a private interface, it could disappear in the future.
never@3009 1375 //
never@3009 1376 // Bsd kernel saves start_stack information in /proc/<pid>/stat. Similar
never@3009 1377 // to __libc_stack_end, it is very close to stack top, but isn't the real
never@3009 1378 // stack top. Note that /proc may not exist if VM is running as a chroot
never@3009 1379 // program, so reading /proc/<pid>/stat could fail. Also the contents of
never@3009 1380 // /proc/<pid>/stat could change in the future (though unlikely).
never@3009 1381 //
never@3009 1382 // We try __libc_stack_end first. If that doesn't work, look for
never@3009 1383 // /proc/<pid>/stat. If neither of them works, we use current stack pointer
never@3009 1384 // as a hint, which should work well in most cases.
never@3009 1385
never@3009 1386 uintptr_t stack_start;
never@3009 1387
never@3009 1388 // try __libc_stack_end first
never@3009 1389 uintptr_t *p = (uintptr_t *)dlsym(RTLD_DEFAULT, "__libc_stack_end");
never@3009 1390 if (p && *p) {
never@3009 1391 stack_start = *p;
never@3009 1392 } else {
never@3009 1393 // see if we can get the start_stack field from /proc/self/stat
never@3009 1394 FILE *fp;
never@3009 1395 int pid;
never@3009 1396 char state;
never@3009 1397 int ppid;
never@3009 1398 int pgrp;
never@3009 1399 int session;
never@3009 1400 int nr;
never@3009 1401 int tpgrp;
never@3009 1402 unsigned long flags;
never@3009 1403 unsigned long minflt;
never@3009 1404 unsigned long cminflt;
never@3009 1405 unsigned long majflt;
never@3009 1406 unsigned long cmajflt;
never@3009 1407 unsigned long utime;
never@3009 1408 unsigned long stime;
never@3009 1409 long cutime;
never@3009 1410 long cstime;
never@3009 1411 long prio;
never@3009 1412 long nice;
never@3009 1413 long junk;
never@3009 1414 long it_real;
never@3009 1415 uintptr_t start;
never@3009 1416 uintptr_t vsize;
never@3009 1417 intptr_t rss;
never@3009 1418 uintptr_t rsslim;
never@3009 1419 uintptr_t scodes;
never@3009 1420 uintptr_t ecode;
never@3009 1421 int i;
never@3009 1422
never@3009 1423 // Figure what the primordial thread stack base is. Code is inspired
never@3009 1424 // by email from Hans Boehm. /proc/self/stat begins with current pid,
never@3009 1425 // followed by command name surrounded by parentheses, state, etc.
never@3009 1426 char stat[2048];
never@3009 1427 int statlen;
never@3009 1428
never@3009 1429 fp = fopen("/proc/self/stat", "r");
never@3009 1430 if (fp) {
never@3009 1431 statlen = fread(stat, 1, 2047, fp);
never@3009 1432 stat[statlen] = '\0';
never@3009 1433 fclose(fp);
never@3009 1434
never@3009 1435 // Skip pid and the command string. Note that we could be dealing with
never@3009 1436 // weird command names, e.g. user could decide to rename java launcher
never@3009 1437 // to "java 1.4.2 :)", then the stat file would look like
never@3009 1438 // 1234 (java 1.4.2 :)) R ... ...
never@3009 1439 // We don't really need to know the command string, just find the last
never@3009 1440 // occurrence of ")" and then start parsing from there. See bug 4726580.
never@3009 1441 char * s = strrchr(stat, ')');
never@3009 1442
never@3009 1443 i = 0;
never@3009 1444 if (s) {
never@3009 1445 // Skip blank chars
never@3009 1446 do s++; while (isspace(*s));
never@3009 1447
never@3009 1448 #define _UFM UINTX_FORMAT
never@3009 1449 #define _DFM INTX_FORMAT
never@3009 1450
never@3009 1451 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 */
never@3009 1452 /* 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 */
never@3009 1453 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,
never@3009 1454 &state, /* 3 %c */
never@3009 1455 &ppid, /* 4 %d */
never@3009 1456 &pgrp, /* 5 %d */
never@3009 1457 &session, /* 6 %d */
never@3009 1458 &nr, /* 7 %d */
never@3009 1459 &tpgrp, /* 8 %d */
never@3009 1460 &flags, /* 9 %lu */
never@3009 1461 &minflt, /* 10 %lu */
never@3009 1462 &cminflt, /* 11 %lu */
never@3009 1463 &majflt, /* 12 %lu */
never@3009 1464 &cmajflt, /* 13 %lu */
never@3009 1465 &utime, /* 14 %lu */
never@3009 1466 &stime, /* 15 %lu */
never@3009 1467 &cutime, /* 16 %ld */
never@3009 1468 &cstime, /* 17 %ld */
never@3009 1469 &prio, /* 18 %ld */
never@3009 1470 &nice, /* 19 %ld */
never@3009 1471 &junk, /* 20 %ld */
never@3009 1472 &it_real, /* 21 %ld */
never@3009 1473 &start, /* 22 UINTX_FORMAT */
never@3009 1474 &vsize, /* 23 UINTX_FORMAT */
never@3009 1475 &rss, /* 24 INTX_FORMAT */
never@3009 1476 &rsslim, /* 25 UINTX_FORMAT */
never@3009 1477 &scodes, /* 26 UINTX_FORMAT */
never@3009 1478 &ecode, /* 27 UINTX_FORMAT */
never@3009 1479 &stack_start); /* 28 UINTX_FORMAT */
never@3009 1480 }
never@3009 1481
never@3009 1482 #undef _UFM
never@3009 1483 #undef _DFM
never@3009 1484
never@3009 1485 if (i != 28 - 2) {
never@3009 1486 assert(false, "Bad conversion from /proc/self/stat");
never@3009 1487 // product mode - assume we are the initial thread, good luck in the
never@3009 1488 // embedded case.
never@3009 1489 warning("Can't detect initial thread stack location - bad conversion");
never@3009 1490 stack_start = (uintptr_t) &rlim;
never@3009 1491 }
never@3009 1492 } else {
never@3009 1493 // For some reason we can't open /proc/self/stat (for example, running on
never@3009 1494 // FreeBSD with a Bsd emulator, or inside chroot), this should work for
never@3009 1495 // most cases, so don't abort:
never@3009 1496 warning("Can't detect initial thread stack location - no /proc/self/stat");
never@3009 1497 stack_start = (uintptr_t) &rlim;
never@3009 1498 }
never@3009 1499 }
never@3009 1500
never@3009 1501 // Now we have a pointer (stack_start) very close to the stack top, the
never@3009 1502 // next thing to do is to figure out the exact location of stack top. We
never@3009 1503 // can find out the virtual memory area that contains stack_start by
never@3009 1504 // reading /proc/self/maps, it should be the last vma in /proc/self/maps,
never@3009 1505 // and its upper limit is the real stack top. (again, this would fail if
never@3009 1506 // running inside chroot, because /proc may not exist.)
never@3009 1507
never@3009 1508 uintptr_t stack_top;
never@3009 1509 address low, high;
never@3009 1510 if (find_vma((address)stack_start, &low, &high)) {
never@3009 1511 // success, "high" is the true stack top. (ignore "low", because initial
never@3009 1512 // thread stack grows on demand, its real bottom is high - RLIMIT_STACK.)
never@3009 1513 stack_top = (uintptr_t)high;
never@3009 1514 } else {
never@3009 1515 // failed, likely because /proc/self/maps does not exist
never@3009 1516 warning("Can't detect initial thread stack location - find_vma failed");
never@3009 1517 // best effort: stack_start is normally within a few pages below the real
never@3009 1518 // stack top, use it as stack top, and reduce stack size so we won't put
never@3009 1519 // guard page outside stack.
never@3009 1520 stack_top = stack_start;
never@3009 1521 stack_size -= 16 * page_size();
never@3009 1522 }
never@3009 1523
never@3009 1524 // stack_top could be partially down the page so align it
never@3009 1525 stack_top = align_size_up(stack_top, page_size());
never@3009 1526
never@3009 1527 if (max_size && stack_size > max_size) {
never@3009 1528 _initial_thread_stack_size = max_size;
never@3009 1529 } else {
never@3009 1530 _initial_thread_stack_size = stack_size;
never@3009 1531 }
never@3009 1532
never@3009 1533 _initial_thread_stack_size = align_size_down(_initial_thread_stack_size, page_size());
never@3009 1534 _initial_thread_stack_bottom = (address)stack_top - _initial_thread_stack_size;
never@3009 1535 }
never@3009 1536 #endif
never@3009 1537
never@3009 1538 ////////////////////////////////////////////////////////////////////////////////
never@3009 1539 // time support
never@3009 1540
never@3009 1541 // Time since start-up in seconds to a fine granularity.
never@3009 1542 // Used by VMSelfDestructTimer and the MemProfiler.
never@3009 1543 double os::elapsedTime() {
never@3009 1544
never@3009 1545 return (double)(os::elapsed_counter()) * 0.000001;
never@3009 1546 }
never@3009 1547
never@3009 1548 jlong os::elapsed_counter() {
never@3009 1549 timeval time;
never@3009 1550 int status = gettimeofday(&time, NULL);
never@3009 1551 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
never@3009 1552 }
never@3009 1553
never@3009 1554 jlong os::elapsed_frequency() {
never@3009 1555 return (1000 * 1000);
never@3009 1556 }
never@3009 1557
never@3009 1558 // XXX: For now, code this as if BSD does not support vtime.
never@3009 1559 bool os::supports_vtime() { return false; }
never@3009 1560 bool os::enable_vtime() { return false; }
never@3009 1561 bool os::vtime_enabled() { return false; }
never@3009 1562 double os::elapsedVTime() {
never@3009 1563 // better than nothing, but not much
never@3009 1564 return elapsedTime();
never@3009 1565 }
never@3009 1566
never@3009 1567 jlong os::javaTimeMillis() {
never@3009 1568 timeval time;
never@3009 1569 int status = gettimeofday(&time, NULL);
never@3009 1570 assert(status != -1, "bsd error");
never@3009 1571 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
never@3009 1572 }
never@3009 1573
never@3009 1574 #ifndef CLOCK_MONOTONIC
never@3009 1575 #define CLOCK_MONOTONIC (1)
never@3009 1576 #endif
never@3009 1577
never@3009 1578 #ifdef __APPLE__
never@3009 1579 void os::Bsd::clock_init() {
never@3009 1580 // XXXDARWIN: Investigate replacement monotonic clock
never@3009 1581 }
never@3009 1582 #elif defined(_ALLBSD_SOURCE)
never@3009 1583 void os::Bsd::clock_init() {
never@3009 1584 struct timespec res;
never@3009 1585 struct timespec tp;
never@3009 1586 if (::clock_getres(CLOCK_MONOTONIC, &res) == 0 &&
never@3009 1587 ::clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
never@3009 1588 // yes, monotonic clock is supported
never@3009 1589 _clock_gettime = ::clock_gettime;
never@3009 1590 }
never@3009 1591 }
never@3009 1592 #else
never@3009 1593 void os::Bsd::clock_init() {
never@3009 1594 // we do dlopen's in this particular order due to bug in bsd
never@3009 1595 // dynamical loader (see 6348968) leading to crash on exit
never@3009 1596 void* handle = dlopen("librt.so.1", RTLD_LAZY);
never@3009 1597 if (handle == NULL) {
never@3009 1598 handle = dlopen("librt.so", RTLD_LAZY);
never@3009 1599 }
never@3009 1600
never@3009 1601 if (handle) {
never@3009 1602 int (*clock_getres_func)(clockid_t, struct timespec*) =
never@3009 1603 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_getres");
never@3009 1604 int (*clock_gettime_func)(clockid_t, struct timespec*) =
never@3009 1605 (int(*)(clockid_t, struct timespec*))dlsym(handle, "clock_gettime");
never@3009 1606 if (clock_getres_func && clock_gettime_func) {
never@3009 1607 // See if monotonic clock is supported by the kernel. Note that some
never@3009 1608 // early implementations simply return kernel jiffies (updated every
never@3009 1609 // 1/100 or 1/1000 second). It would be bad to use such a low res clock
never@3009 1610 // for nano time (though the monotonic property is still nice to have).
never@3009 1611 // It's fixed in newer kernels, however clock_getres() still returns
never@3009 1612 // 1/HZ. We check if clock_getres() works, but will ignore its reported
never@3009 1613 // resolution for now. Hopefully as people move to new kernels, this
never@3009 1614 // won't be a problem.
never@3009 1615 struct timespec res;
never@3009 1616 struct timespec tp;
never@3009 1617 if (clock_getres_func (CLOCK_MONOTONIC, &res) == 0 &&
never@3009 1618 clock_gettime_func(CLOCK_MONOTONIC, &tp) == 0) {
never@3009 1619 // yes, monotonic clock is supported
never@3009 1620 _clock_gettime = clock_gettime_func;
never@3009 1621 } else {
never@3009 1622 // close librt if there is no monotonic clock
never@3009 1623 dlclose(handle);
never@3009 1624 }
never@3009 1625 }
never@3009 1626 }
never@3009 1627 }
never@3009 1628 #endif
never@3009 1629
never@3009 1630 #ifndef _ALLBSD_SOURCE
never@3009 1631 #ifndef SYS_clock_getres
never@3009 1632
never@3009 1633 #if defined(IA32) || defined(AMD64)
never@3009 1634 #define SYS_clock_getres IA32_ONLY(266) AMD64_ONLY(229)
never@3009 1635 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y)
never@3009 1636 #else
never@3009 1637 #warning "SYS_clock_getres not defined for this platform, disabling fast_thread_cpu_time"
never@3009 1638 #define sys_clock_getres(x,y) -1
never@3009 1639 #endif
never@3009 1640
never@3009 1641 #else
never@3009 1642 #define sys_clock_getres(x,y) ::syscall(SYS_clock_getres, x, y)
never@3009 1643 #endif
never@3009 1644
never@3009 1645 void os::Bsd::fast_thread_clock_init() {
never@3009 1646 if (!UseBsdPosixThreadCPUClocks) {
never@3009 1647 return;
never@3009 1648 }
never@3009 1649 clockid_t clockid;
never@3009 1650 struct timespec tp;
never@3009 1651 int (*pthread_getcpuclockid_func)(pthread_t, clockid_t *) =
never@3009 1652 (int(*)(pthread_t, clockid_t *)) dlsym(RTLD_DEFAULT, "pthread_getcpuclockid");
never@3009 1653
never@3009 1654 // Switch to using fast clocks for thread cpu time if
never@3009 1655 // the sys_clock_getres() returns 0 error code.
never@3009 1656 // Note, that some kernels may support the current thread
never@3009 1657 // clock (CLOCK_THREAD_CPUTIME_ID) but not the clocks
never@3009 1658 // returned by the pthread_getcpuclockid().
never@3009 1659 // If the fast Posix clocks are supported then the sys_clock_getres()
never@3009 1660 // must return at least tp.tv_sec == 0 which means a resolution
never@3009 1661 // better than 1 sec. This is extra check for reliability.
never@3009 1662
never@3009 1663 if(pthread_getcpuclockid_func &&
never@3009 1664 pthread_getcpuclockid_func(_main_thread, &clockid) == 0 &&
never@3009 1665 sys_clock_getres(clockid, &tp) == 0 && tp.tv_sec == 0) {
never@3009 1666
never@3009 1667 _supports_fast_thread_cpu_time = true;
never@3009 1668 _pthread_getcpuclockid = pthread_getcpuclockid_func;
never@3009 1669 }
never@3009 1670 }
never@3009 1671 #endif
never@3009 1672
never@3009 1673 jlong os::javaTimeNanos() {
never@3009 1674 if (Bsd::supports_monotonic_clock()) {
never@3009 1675 struct timespec tp;
never@3009 1676 int status = Bsd::clock_gettime(CLOCK_MONOTONIC, &tp);
never@3009 1677 assert(status == 0, "gettime error");
never@3009 1678 jlong result = jlong(tp.tv_sec) * (1000 * 1000 * 1000) + jlong(tp.tv_nsec);
never@3009 1679 return result;
never@3009 1680 } else {
never@3009 1681 timeval time;
never@3009 1682 int status = gettimeofday(&time, NULL);
never@3009 1683 assert(status != -1, "bsd error");
never@3009 1684 jlong usecs = jlong(time.tv_sec) * (1000 * 1000) + jlong(time.tv_usec);
never@3009 1685 return 1000 * usecs;
never@3009 1686 }
never@3009 1687 }
never@3009 1688
never@3009 1689 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
never@3009 1690 if (Bsd::supports_monotonic_clock()) {
never@3009 1691 info_ptr->max_value = ALL_64_BITS;
never@3009 1692
never@3009 1693 // CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
never@3009 1694 info_ptr->may_skip_backward = false; // not subject to resetting or drifting
never@3009 1695 info_ptr->may_skip_forward = false; // not subject to resetting or drifting
never@3009 1696 } else {
never@3009 1697 // gettimeofday - based on time in seconds since the Epoch thus does not wrap
never@3009 1698 info_ptr->max_value = ALL_64_BITS;
never@3009 1699
never@3009 1700 // gettimeofday is a real time clock so it skips
never@3009 1701 info_ptr->may_skip_backward = true;
never@3009 1702 info_ptr->may_skip_forward = true;
never@3009 1703 }
never@3009 1704
never@3009 1705 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
never@3009 1706 }
never@3009 1707
never@3009 1708 // Return the real, user, and system times in seconds from an
never@3009 1709 // arbitrary fixed point in the past.
never@3009 1710 bool os::getTimesSecs(double* process_real_time,
never@3009 1711 double* process_user_time,
never@3009 1712 double* process_system_time) {
never@3009 1713 struct tms ticks;
never@3009 1714 clock_t real_ticks = times(&ticks);
never@3009 1715
never@3009 1716 if (real_ticks == (clock_t) (-1)) {
never@3009 1717 return false;
never@3009 1718 } else {
never@3009 1719 double ticks_per_second = (double) clock_tics_per_sec;
never@3009 1720 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
never@3009 1721 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
never@3009 1722 *process_real_time = ((double) real_ticks) / ticks_per_second;
never@3009 1723
never@3009 1724 return true;
never@3009 1725 }
never@3009 1726 }
never@3009 1727
never@3009 1728
never@3009 1729 char * os::local_time_string(char *buf, size_t buflen) {
never@3009 1730 struct tm t;
never@3009 1731 time_t long_time;
never@3009 1732 time(&long_time);
never@3009 1733 localtime_r(&long_time, &t);
never@3009 1734 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
never@3009 1735 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
never@3009 1736 t.tm_hour, t.tm_min, t.tm_sec);
never@3009 1737 return buf;
never@3009 1738 }
never@3009 1739
never@3009 1740 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
never@3009 1741 return localtime_r(clock, res);
never@3009 1742 }
never@3009 1743
never@3009 1744 ////////////////////////////////////////////////////////////////////////////////
never@3009 1745 // runtime exit support
never@3009 1746
never@3009 1747 // Note: os::shutdown() might be called very early during initialization, or
never@3009 1748 // called from signal handler. Before adding something to os::shutdown(), make
never@3009 1749 // sure it is async-safe and can handle partially initialized VM.
never@3009 1750 void os::shutdown() {
never@3009 1751
never@3009 1752 // allow PerfMemory to attempt cleanup of any persistent resources
never@3009 1753 perfMemory_exit();
never@3009 1754
never@3009 1755 // needs to remove object in file system
never@3009 1756 AttachListener::abort();
never@3009 1757
never@3009 1758 // flush buffered output, finish log files
never@3009 1759 ostream_abort();
never@3009 1760
never@3009 1761 // Check for abort hook
never@3009 1762 abort_hook_t abort_hook = Arguments::abort_hook();
never@3009 1763 if (abort_hook != NULL) {
never@3009 1764 abort_hook();
never@3009 1765 }
never@3009 1766
never@3009 1767 }
never@3009 1768
never@3009 1769 // Note: os::abort() might be called very early during initialization, or
never@3009 1770 // called from signal handler. Before adding something to os::abort(), make
never@3009 1771 // sure it is async-safe and can handle partially initialized VM.
never@3009 1772 void os::abort(bool dump_core) {
never@3009 1773 os::shutdown();
never@3009 1774 if (dump_core) {
never@3009 1775 #ifndef PRODUCT
never@3009 1776 fdStream out(defaultStream::output_fd());
never@3009 1777 out.print_raw("Current thread is ");
never@3009 1778 char buf[16];
never@3009 1779 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
never@3009 1780 out.print_raw_cr(buf);
never@3009 1781 out.print_raw_cr("Dumping core ...");
never@3009 1782 #endif
never@3009 1783 ::abort(); // dump core
never@3009 1784 }
never@3009 1785
never@3009 1786 ::exit(1);
never@3009 1787 }
never@3009 1788
never@3009 1789 // Die immediately, no exit hook, no abort hook, no cleanup.
never@3009 1790 void os::die() {
never@3009 1791 // _exit() on BsdThreads only kills current thread
never@3009 1792 ::abort();
never@3009 1793 }
never@3009 1794
never@3009 1795 // unused on bsd for now.
never@3009 1796 void os::set_error_file(const char *logfile) {}
never@3009 1797
never@3009 1798
never@3009 1799 // This method is a copy of JDK's sysGetLastErrorString
never@3009 1800 // from src/solaris/hpi/src/system_md.c
never@3009 1801
never@3009 1802 size_t os::lasterror(char *buf, size_t len) {
never@3009 1803
never@3009 1804 if (errno == 0) return 0;
never@3009 1805
never@3009 1806 const char *s = ::strerror(errno);
never@3009 1807 size_t n = ::strlen(s);
never@3009 1808 if (n >= len) {
never@3009 1809 n = len - 1;
never@3009 1810 }
never@3009 1811 ::strncpy(buf, s, n);
never@3009 1812 buf[n] = '\0';
never@3009 1813 return n;
never@3009 1814 }
never@3009 1815
sla@3544 1816 intx os::current_thread_id() {
sla@3544 1817 #ifdef __APPLE__
sla@3544 1818 return (intx)::mach_thread_self();
sla@3544 1819 #else
sla@3544 1820 return (intx)::pthread_self();
sla@3544 1821 #endif
sla@3544 1822 }
never@3009 1823 int os::current_process_id() {
never@3009 1824
never@3009 1825 // Under the old bsd thread library, bsd gives each thread
never@3009 1826 // its own process id. Because of this each thread will return
never@3009 1827 // a different pid if this method were to return the result
never@3009 1828 // of getpid(2). Bsd provides no api that returns the pid
never@3009 1829 // of the launcher thread for the vm. This implementation
never@3009 1830 // returns a unique pid, the pid of the launcher thread
never@3009 1831 // that starts the vm 'process'.
never@3009 1832
never@3009 1833 // Under the NPTL, getpid() returns the same pid as the
never@3009 1834 // launcher thread rather than a unique pid per thread.
never@3009 1835 // Use gettid() if you want the old pre NPTL behaviour.
never@3009 1836
never@3009 1837 // if you are looking for the result of a call to getpid() that
never@3009 1838 // returns a unique pid for the calling thread, then look at the
never@3009 1839 // OSThread::thread_id() method in osThread_bsd.hpp file
never@3009 1840
never@3009 1841 return (int)(_initial_pid ? _initial_pid : getpid());
never@3009 1842 }
never@3009 1843
never@3009 1844 // DLL functions
never@3009 1845
never@3009 1846 #define JNI_LIB_PREFIX "lib"
never@3009 1847 #ifdef __APPLE__
never@3009 1848 #define JNI_LIB_SUFFIX ".dylib"
never@3009 1849 #else
never@3009 1850 #define JNI_LIB_SUFFIX ".so"
never@3009 1851 #endif
never@3009 1852
never@3009 1853 const char* os::dll_file_extension() { return JNI_LIB_SUFFIX; }
never@3009 1854
never@3009 1855 // This must be hard coded because it's the system's temporary
never@3009 1856 // directory not the java application's temp directory, ala java.io.tmpdir.
dcubed@3055 1857 #ifdef __APPLE__
dcubed@3055 1858 // macosx has a secure per-user temporary directory
dcubed@3055 1859 char temp_path_storage[PATH_MAX];
dcubed@3055 1860 const char* os::get_temp_directory() {
dcubed@3055 1861 static char *temp_path = NULL;
dcubed@3055 1862 if (temp_path == NULL) {
dcubed@3055 1863 int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
dcubed@3055 1864 if (pathSize == 0 || pathSize > PATH_MAX) {
dcubed@3055 1865 strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
dcubed@3055 1866 }
dcubed@3055 1867 temp_path = temp_path_storage;
dcubed@3055 1868 }
dcubed@3055 1869 return temp_path;
dcubed@3055 1870 }
dcubed@3055 1871 #else /* __APPLE__ */
never@3009 1872 const char* os::get_temp_directory() { return "/tmp"; }
dcubed@3055 1873 #endif /* __APPLE__ */
never@3009 1874
never@3009 1875 static bool file_exists(const char* filename) {
never@3009 1876 struct stat statbuf;
never@3009 1877 if (filename == NULL || strlen(filename) == 0) {
never@3009 1878 return false;
never@3009 1879 }
never@3009 1880 return os::stat(filename, &statbuf) == 0;
never@3009 1881 }
never@3009 1882
never@3009 1883 void os::dll_build_name(char* buffer, size_t buflen,
never@3009 1884 const char* pname, const char* fname) {
never@3009 1885 // Copied from libhpi
never@3009 1886 const size_t pnamelen = pname ? strlen(pname) : 0;
never@3009 1887
never@3009 1888 // Quietly truncate on buffer overflow. Should be an error.
never@3009 1889 if (pnamelen + strlen(fname) + strlen(JNI_LIB_PREFIX) + strlen(JNI_LIB_SUFFIX) + 2 > buflen) {
never@3009 1890 *buffer = '\0';
never@3009 1891 return;
never@3009 1892 }
never@3009 1893
never@3009 1894 if (pnamelen == 0) {
never@3009 1895 snprintf(buffer, buflen, JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, fname);
never@3009 1896 } else if (strchr(pname, *os::path_separator()) != NULL) {
never@3009 1897 int n;
never@3009 1898 char** pelements = split_path(pname, &n);
never@3009 1899 for (int i = 0 ; i < n ; i++) {
never@3009 1900 // Really shouldn't be NULL, but check can't hurt
never@3009 1901 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
never@3009 1902 continue; // skip the empty path values
never@3009 1903 }
never@3009 1904 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX,
never@3009 1905 pelements[i], fname);
never@3009 1906 if (file_exists(buffer)) {
never@3009 1907 break;
never@3009 1908 }
never@3009 1909 }
never@3009 1910 // release the storage
never@3009 1911 for (int i = 0 ; i < n ; i++) {
never@3009 1912 if (pelements[i] != NULL) {
zgu@4135 1913 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal);
never@3009 1914 }
never@3009 1915 }
never@3009 1916 if (pelements != NULL) {
zgu@4135 1917 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal);
never@3009 1918 }
never@3009 1919 } else {
never@3009 1920 snprintf(buffer, buflen, "%s/" JNI_LIB_PREFIX "%s" JNI_LIB_SUFFIX, pname, fname);
never@3009 1921 }
never@3009 1922 }
never@3009 1923
never@3009 1924 const char* os::get_current_directory(char *buf, int buflen) {
never@3009 1925 return getcwd(buf, buflen);
never@3009 1926 }
never@3009 1927
never@3009 1928 // check if addr is inside libjvm[_g].so
never@3009 1929 bool os::address_is_in_vm(address addr) {
never@3009 1930 static address libjvm_base_addr;
never@3009 1931 Dl_info dlinfo;
never@3009 1932
never@3009 1933 if (libjvm_base_addr == NULL) {
never@3009 1934 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo);
never@3009 1935 libjvm_base_addr = (address)dlinfo.dli_fbase;
never@3009 1936 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm");
never@3009 1937 }
never@3009 1938
never@3009 1939 if (dladdr((void *)addr, &dlinfo)) {
never@3009 1940 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true;
never@3009 1941 }
never@3009 1942
never@3009 1943 return false;
never@3009 1944 }
never@3009 1945
zgu@4196 1946
zgu@4196 1947 #define MACH_MAXSYMLEN 256
zgu@4196 1948
never@3009 1949 bool os::dll_address_to_function_name(address addr, char *buf,
never@3009 1950 int buflen, int *offset) {
never@3009 1951 Dl_info dlinfo;
zgu@4196 1952 char localbuf[MACH_MAXSYMLEN];
zgu@4196 1953
zgu@4196 1954 // dladdr will find names of dynamic functions only, but does
zgu@4196 1955 // it set dli_fbase with mach_header address when it "fails" ?
never@3009 1956 if (dladdr((void*)addr, &dlinfo) && dlinfo.dli_sname != NULL) {
never@3009 1957 if (buf != NULL) {
never@3009 1958 if(!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) {
never@3009 1959 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname);
never@3009 1960 }
never@3009 1961 }
never@3009 1962 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr;
never@3009 1963 return true;
never@3009 1964 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) {
never@3009 1965 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase),
zgu@3299 1966 buf, buflen, offset, dlinfo.dli_fname)) {
never@3009 1967 return true;
never@3009 1968 }
never@3009 1969 }
never@3009 1970
zgu@4196 1971 // Handle non-dymanic manually:
zgu@4196 1972 if (dlinfo.dli_fbase != NULL &&
zgu@4196 1973 Decoder::decode(addr, localbuf, MACH_MAXSYMLEN, offset, dlinfo.dli_fbase)) {
zgu@4196 1974 if(!Decoder::demangle(localbuf, buf, buflen)) {
zgu@4196 1975 jio_snprintf(buf, buflen, "%s", localbuf);
zgu@4196 1976 }
zgu@4196 1977 return true;
zgu@4196 1978 }
never@3009 1979 if (buf != NULL) buf[0] = '\0';
never@3009 1980 if (offset != NULL) *offset = -1;
never@3009 1981 return false;
never@3009 1982 }
never@3009 1983
never@3009 1984 #ifdef _ALLBSD_SOURCE
never@3009 1985 // ported from solaris version
never@3009 1986 bool os::dll_address_to_library_name(address addr, char* buf,
never@3009 1987 int buflen, int* offset) {
never@3009 1988 Dl_info dlinfo;
never@3009 1989
never@3009 1990 if (dladdr((void*)addr, &dlinfo)){
never@3009 1991 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
never@3009 1992 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
never@3009 1993 return true;
never@3009 1994 } else {
never@3009 1995 if (buf) buf[0] = '\0';
never@3009 1996 if (offset) *offset = -1;
never@3009 1997 return false;
never@3009 1998 }
never@3009 1999 }
never@3009 2000 #else
never@3009 2001 struct _address_to_library_name {
never@3009 2002 address addr; // input : memory address
never@3009 2003 size_t buflen; // size of fname
never@3009 2004 char* fname; // output: library name
never@3009 2005 address base; // library base addr
never@3009 2006 };
never@3009 2007
never@3009 2008 static int address_to_library_name_callback(struct dl_phdr_info *info,
never@3009 2009 size_t size, void *data) {
never@3009 2010 int i;
never@3009 2011 bool found = false;
never@3009 2012 address libbase = NULL;
never@3009 2013 struct _address_to_library_name * d = (struct _address_to_library_name *)data;
never@3009 2014
never@3009 2015 // iterate through all loadable segments
never@3009 2016 for (i = 0; i < info->dlpi_phnum; i++) {
never@3009 2017 address segbase = (address)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr);
never@3009 2018 if (info->dlpi_phdr[i].p_type == PT_LOAD) {
never@3009 2019 // base address of a library is the lowest address of its loaded
never@3009 2020 // segments.
never@3009 2021 if (libbase == NULL || libbase > segbase) {
never@3009 2022 libbase = segbase;
never@3009 2023 }
never@3009 2024 // see if 'addr' is within current segment
never@3009 2025 if (segbase <= d->addr &&
never@3009 2026 d->addr < segbase + info->dlpi_phdr[i].p_memsz) {
never@3009 2027 found = true;
never@3009 2028 }
never@3009 2029 }
never@3009 2030 }
never@3009 2031
never@3009 2032 // dlpi_name is NULL or empty if the ELF file is executable, return 0
never@3009 2033 // so dll_address_to_library_name() can fall through to use dladdr() which
never@3009 2034 // can figure out executable name from argv[0].
never@3009 2035 if (found && info->dlpi_name && info->dlpi_name[0]) {
never@3009 2036 d->base = libbase;
never@3009 2037 if (d->fname) {
never@3009 2038 jio_snprintf(d->fname, d->buflen, "%s", info->dlpi_name);
never@3009 2039 }
never@3009 2040 return 1;
never@3009 2041 }
never@3009 2042 return 0;
never@3009 2043 }
never@3009 2044
never@3009 2045 bool os::dll_address_to_library_name(address addr, char* buf,
never@3009 2046 int buflen, int* offset) {
never@3009 2047 Dl_info dlinfo;
never@3009 2048 struct _address_to_library_name data;
never@3009 2049
never@3009 2050 // There is a bug in old glibc dladdr() implementation that it could resolve
never@3009 2051 // to wrong library name if the .so file has a base address != NULL. Here
never@3009 2052 // we iterate through the program headers of all loaded libraries to find
never@3009 2053 // out which library 'addr' really belongs to. This workaround can be
never@3009 2054 // removed once the minimum requirement for glibc is moved to 2.3.x.
never@3009 2055 data.addr = addr;
never@3009 2056 data.fname = buf;
never@3009 2057 data.buflen = buflen;
never@3009 2058 data.base = NULL;
never@3009 2059 int rslt = dl_iterate_phdr(address_to_library_name_callback, (void *)&data);
never@3009 2060
never@3009 2061 if (rslt) {
never@3009 2062 // buf already contains library name
never@3009 2063 if (offset) *offset = addr - data.base;
never@3009 2064 return true;
never@3009 2065 } else if (dladdr((void*)addr, &dlinfo)){
never@3009 2066 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname);
never@3009 2067 if (offset) *offset = addr - (address)dlinfo.dli_fbase;
never@3009 2068 return true;
never@3009 2069 } else {
never@3009 2070 if (buf) buf[0] = '\0';
never@3009 2071 if (offset) *offset = -1;
never@3009 2072 return false;
never@3009 2073 }
never@3009 2074 }
never@3009 2075 #endif
never@3009 2076
never@3009 2077 // Loads .dll/.so and
never@3009 2078 // in case of error it checks if .dll/.so was built for the
never@3009 2079 // same architecture as Hotspot is running on
never@3009 2080
never@3009 2081 #ifdef __APPLE__
never@3009 2082 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
never@3009 2083 void * result= ::dlopen(filename, RTLD_LAZY);
never@3009 2084 if (result != NULL) {
never@3009 2085 // Successful loading
never@3009 2086 return result;
never@3009 2087 }
never@3009 2088
never@3009 2089 // Read system error message into ebuf
never@3009 2090 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
never@3009 2091 ebuf[ebuflen-1]='\0';
never@3009 2092
never@3009 2093 return NULL;
never@3009 2094 }
never@3009 2095 #else
never@3009 2096 void * os::dll_load(const char *filename, char *ebuf, int ebuflen)
never@3009 2097 {
never@3009 2098 void * result= ::dlopen(filename, RTLD_LAZY);
never@3009 2099 if (result != NULL) {
never@3009 2100 // Successful loading
never@3009 2101 return result;
never@3009 2102 }
never@3009 2103
never@3009 2104 Elf32_Ehdr elf_head;
never@3009 2105
never@3009 2106 // Read system error message into ebuf
never@3009 2107 // It may or may not be overwritten below
never@3009 2108 ::strncpy(ebuf, ::dlerror(), ebuflen-1);
never@3009 2109 ebuf[ebuflen-1]='\0';
never@3009 2110 int diag_msg_max_length=ebuflen-strlen(ebuf);
never@3009 2111 char* diag_msg_buf=ebuf+strlen(ebuf);
never@3009 2112
never@3009 2113 if (diag_msg_max_length==0) {
never@3009 2114 // No more space in ebuf for additional diagnostics message
never@3009 2115 return NULL;
never@3009 2116 }
never@3009 2117
never@3009 2118
never@3009 2119 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK);
never@3009 2120
never@3009 2121 if (file_descriptor < 0) {
never@3009 2122 // Can't open library, report dlerror() message
never@3009 2123 return NULL;
never@3009 2124 }
never@3009 2125
never@3009 2126 bool failed_to_read_elf_head=
never@3009 2127 (sizeof(elf_head)!=
never@3009 2128 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ;
never@3009 2129
never@3009 2130 ::close(file_descriptor);
never@3009 2131 if (failed_to_read_elf_head) {
never@3009 2132 // file i/o error - report dlerror() msg
never@3009 2133 return NULL;
never@3009 2134 }
never@3009 2135
never@3009 2136 typedef struct {
never@3009 2137 Elf32_Half code; // Actual value as defined in elf.h
never@3009 2138 Elf32_Half compat_class; // Compatibility of archs at VM's sense
never@3009 2139 char elf_class; // 32 or 64 bit
never@3009 2140 char endianess; // MSB or LSB
never@3009 2141 char* name; // String representation
never@3009 2142 } arch_t;
never@3009 2143
never@3009 2144 #ifndef EM_486
never@3009 2145 #define EM_486 6 /* Intel 80486 */
never@3009 2146 #endif
never@3009 2147
never@3009 2148 #ifndef EM_MIPS_RS3_LE
never@3009 2149 #define EM_MIPS_RS3_LE 10 /* MIPS */
never@3009 2150 #endif
never@3009 2151
never@3009 2152 #ifndef EM_PPC64
never@3009 2153 #define EM_PPC64 21 /* PowerPC64 */
never@3009 2154 #endif
never@3009 2155
never@3009 2156 #ifndef EM_S390
never@3009 2157 #define EM_S390 22 /* IBM System/390 */
never@3009 2158 #endif
never@3009 2159
never@3009 2160 #ifndef EM_IA_64
never@3009 2161 #define EM_IA_64 50 /* HP/Intel IA-64 */
never@3009 2162 #endif
never@3009 2163
never@3009 2164 #ifndef EM_X86_64
never@3009 2165 #define EM_X86_64 62 /* AMD x86-64 */
never@3009 2166 #endif
never@3009 2167
never@3009 2168 static const arch_t arch_array[]={
never@3009 2169 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
never@3009 2170 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
never@3009 2171 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"},
never@3009 2172 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"},
never@3009 2173 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
never@3009 2174 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"},
never@3009 2175 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"},
never@3009 2176 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"},
never@3009 2177 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"},
never@3009 2178 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
never@3009 2179 {EM_S390, EM_S390, ELFCLASSNONE, ELFDATA2MSB, (char*)"IBM System/390"},
never@3009 2180 {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
never@3009 2181 {EM_MIPS_RS3_LE, EM_MIPS_RS3_LE, ELFCLASS32, ELFDATA2LSB, (char*)"MIPSel"},
never@3009 2182 {EM_MIPS, EM_MIPS, ELFCLASS32, ELFDATA2MSB, (char*)"MIPS"},
never@3009 2183 {EM_PARISC, EM_PARISC, ELFCLASS32, ELFDATA2MSB, (char*)"PARISC"},
never@3009 2184 {EM_68K, EM_68K, ELFCLASS32, ELFDATA2MSB, (char*)"M68k"}
never@3009 2185 };
never@3009 2186
never@3009 2187 #if (defined IA32)
never@3009 2188 static Elf32_Half running_arch_code=EM_386;
never@3009 2189 #elif (defined AMD64)
never@3009 2190 static Elf32_Half running_arch_code=EM_X86_64;
never@3009 2191 #elif (defined IA64)
never@3009 2192 static Elf32_Half running_arch_code=EM_IA_64;
never@3009 2193 #elif (defined __sparc) && (defined _LP64)
never@3009 2194 static Elf32_Half running_arch_code=EM_SPARCV9;
never@3009 2195 #elif (defined __sparc) && (!defined _LP64)
never@3009 2196 static Elf32_Half running_arch_code=EM_SPARC;
never@3009 2197 #elif (defined __powerpc64__)
never@3009 2198 static Elf32_Half running_arch_code=EM_PPC64;
never@3009 2199 #elif (defined __powerpc__)
never@3009 2200 static Elf32_Half running_arch_code=EM_PPC;
never@3009 2201 #elif (defined ARM)
never@3009 2202 static Elf32_Half running_arch_code=EM_ARM;
never@3009 2203 #elif (defined S390)
never@3009 2204 static Elf32_Half running_arch_code=EM_S390;
never@3009 2205 #elif (defined ALPHA)
never@3009 2206 static Elf32_Half running_arch_code=EM_ALPHA;
never@3009 2207 #elif (defined MIPSEL)
never@3009 2208 static Elf32_Half running_arch_code=EM_MIPS_RS3_LE;
never@3009 2209 #elif (defined PARISC)
never@3009 2210 static Elf32_Half running_arch_code=EM_PARISC;
never@3009 2211 #elif (defined MIPS)
never@3009 2212 static Elf32_Half running_arch_code=EM_MIPS;
never@3009 2213 #elif (defined M68K)
never@3009 2214 static Elf32_Half running_arch_code=EM_68K;
never@3009 2215 #else
never@3009 2216 #error Method os::dll_load requires that one of following is defined:\
never@3009 2217 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, S390, ALPHA, MIPS, MIPSEL, PARISC, M68K
never@3009 2218 #endif
never@3009 2219
never@3009 2220 // Identify compatability class for VM's architecture and library's architecture
never@3009 2221 // Obtain string descriptions for architectures
never@3009 2222
never@3009 2223 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL};
never@3009 2224 int running_arch_index=-1;
never@3009 2225
never@3009 2226 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) {
never@3009 2227 if (running_arch_code == arch_array[i].code) {
never@3009 2228 running_arch_index = i;
never@3009 2229 }
never@3009 2230 if (lib_arch.code == arch_array[i].code) {
never@3009 2231 lib_arch.compat_class = arch_array[i].compat_class;
never@3009 2232 lib_arch.name = arch_array[i].name;
never@3009 2233 }
never@3009 2234 }
never@3009 2235
never@3009 2236 assert(running_arch_index != -1,
never@3009 2237 "Didn't find running architecture code (running_arch_code) in arch_array");
never@3009 2238 if (running_arch_index == -1) {
never@3009 2239 // Even though running architecture detection failed
never@3009 2240 // we may still continue with reporting dlerror() message
never@3009 2241 return NULL;
never@3009 2242 }
never@3009 2243
never@3009 2244 if (lib_arch.endianess != arch_array[running_arch_index].endianess) {
never@3009 2245 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)");
never@3009 2246 return NULL;
never@3009 2247 }
never@3009 2248
never@3009 2249 #ifndef S390
never@3009 2250 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) {
never@3009 2251 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)");
never@3009 2252 return NULL;
never@3009 2253 }
never@3009 2254 #endif // !S390
never@3009 2255
never@3009 2256 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) {
never@3009 2257 if ( lib_arch.name!=NULL ) {
never@3009 2258 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
never@3009 2259 " (Possible cause: can't load %s-bit .so on a %s-bit platform)",
never@3009 2260 lib_arch.name, arch_array[running_arch_index].name);
never@3009 2261 } else {
never@3009 2262 ::snprintf(diag_msg_buf, diag_msg_max_length-1,
never@3009 2263 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)",
never@3009 2264 lib_arch.code,
never@3009 2265 arch_array[running_arch_index].name);
never@3009 2266 }
never@3009 2267 }
never@3009 2268
never@3009 2269 return NULL;
never@3009 2270 }
never@3009 2271 #endif /* !__APPLE__ */
never@3009 2272
never@3009 2273 // XXX: Do we need a lock around this as per Linux?
never@3009 2274 void* os::dll_lookup(void* handle, const char* name) {
never@3009 2275 return dlsym(handle, name);
never@3009 2276 }
never@3009 2277
never@3009 2278
never@3009 2279 static bool _print_ascii_file(const char* filename, outputStream* st) {
never@3009 2280 int fd = ::open(filename, O_RDONLY);
never@3009 2281 if (fd == -1) {
never@3009 2282 return false;
never@3009 2283 }
never@3009 2284
never@3009 2285 char buf[32];
never@3009 2286 int bytes;
never@3009 2287 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) {
never@3009 2288 st->print_raw(buf, bytes);
never@3009 2289 }
never@3009 2290
never@3009 2291 ::close(fd);
never@3009 2292
never@3009 2293 return true;
never@3009 2294 }
never@3009 2295
never@3009 2296 void os::print_dll_info(outputStream *st) {
never@3009 2297 st->print_cr("Dynamic libraries:");
never@3009 2298 #ifdef _ALLBSD_SOURCE
never@3009 2299 #ifdef RTLD_DI_LINKMAP
never@3009 2300 Dl_info dli;
never@3009 2301 void *handle;
never@3009 2302 Link_map *map;
never@3009 2303 Link_map *p;
never@3009 2304
never@3009 2305 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) {
never@3009 2306 st->print_cr("Error: Cannot print dynamic libraries.");
never@3009 2307 return;
never@3009 2308 }
never@3009 2309 handle = dlopen(dli.dli_fname, RTLD_LAZY);
never@3009 2310 if (handle == NULL) {
never@3009 2311 st->print_cr("Error: Cannot print dynamic libraries.");
never@3009 2312 return;
never@3009 2313 }
never@3009 2314 dlinfo(handle, RTLD_DI_LINKMAP, &map);
never@3009 2315 if (map == NULL) {
never@3009 2316 st->print_cr("Error: Cannot print dynamic libraries.");
never@3009 2317 return;
never@3009 2318 }
never@3009 2319
never@3009 2320 while (map->l_prev != NULL)
never@3009 2321 map = map->l_prev;
never@3009 2322
never@3009 2323 while (map != NULL) {
never@3009 2324 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name);
never@3009 2325 map = map->l_next;
never@3009 2326 }
never@3009 2327
never@3009 2328 dlclose(handle);
never@3009 2329 #elif defined(__APPLE__)
never@3009 2330 uint32_t count;
never@3009 2331 uint32_t i;
never@3009 2332
never@3009 2333 count = _dyld_image_count();
never@3009 2334 for (i = 1; i < count; i++) {
never@3009 2335 const char *name = _dyld_get_image_name(i);
never@3009 2336 intptr_t slide = _dyld_get_image_vmaddr_slide(i);
never@3009 2337 st->print_cr(PTR_FORMAT " \t%s", slide, name);
never@3009 2338 }
never@3009 2339 #else
never@3009 2340 st->print_cr("Error: Cannot print dynamic libraries.");
never@3009 2341 #endif
never@3009 2342 #else
never@3009 2343 char fname[32];
never@3009 2344 pid_t pid = os::Bsd::gettid();
never@3009 2345
never@3009 2346 jio_snprintf(fname, sizeof(fname), "/proc/%d/maps", pid);
never@3009 2347
never@3009 2348 if (!_print_ascii_file(fname, st)) {
never@3009 2349 st->print("Can not get library information for pid = %d\n", pid);
never@3009 2350 }
never@3009 2351 #endif
never@3009 2352 }
never@3009 2353
nloodin@4020 2354 void os::print_os_info_brief(outputStream* st) {
nloodin@4020 2355 st->print("Bsd");
nloodin@4020 2356
nloodin@4020 2357 os::Posix::print_uname_info(st);
nloodin@4020 2358 }
never@3009 2359
never@3009 2360 void os::print_os_info(outputStream* st) {
never@3009 2361 st->print("OS:");
nloodin@4020 2362 st->print("Bsd");
nloodin@4020 2363
nloodin@4020 2364 os::Posix::print_uname_info(st);
nloodin@4020 2365
nloodin@4020 2366 os::Posix::print_rlimit_info(st);
nloodin@4020 2367
nloodin@4020 2368 os::Posix::print_load_average(st);
never@3009 2369 }
never@3009 2370
never@3009 2371 void os::pd_print_cpu_info(outputStream* st) {
never@3009 2372 // Nothing to do for now.
never@3009 2373 }
never@3009 2374
never@3009 2375 void os::print_memory_info(outputStream* st) {
never@3009 2376
never@3009 2377 st->print("Memory:");
never@3009 2378 st->print(" %dk page", os::vm_page_size()>>10);
never@3009 2379
never@3009 2380 #ifndef _ALLBSD_SOURCE
never@3009 2381 // values in struct sysinfo are "unsigned long"
never@3009 2382 struct sysinfo si;
never@3009 2383 sysinfo(&si);
never@3009 2384 #endif
never@3009 2385
never@3009 2386 st->print(", physical " UINT64_FORMAT "k",
never@3009 2387 os::physical_memory() >> 10);
never@3009 2388 st->print("(" UINT64_FORMAT "k free)",
never@3009 2389 os::available_memory() >> 10);
never@3009 2390 #ifndef _ALLBSD_SOURCE
never@3009 2391 st->print(", swap " UINT64_FORMAT "k",
never@3009 2392 ((jlong)si.totalswap * si.mem_unit) >> 10);
never@3009 2393 st->print("(" UINT64_FORMAT "k free)",
never@3009 2394 ((jlong)si.freeswap * si.mem_unit) >> 10);
never@3009 2395 #endif
never@3009 2396 st->cr();
never@3009 2397
never@3009 2398 // meminfo
never@3009 2399 st->print("\n/proc/meminfo:\n");
never@3009 2400 _print_ascii_file("/proc/meminfo", st);
never@3009 2401 st->cr();
never@3009 2402 }
never@3009 2403
never@3009 2404 // Taken from /usr/include/bits/siginfo.h Supposed to be architecture specific
never@3009 2405 // but they're the same for all the bsd arch that we support
never@3009 2406 // and they're the same for solaris but there's no common place to put this.
never@3009 2407 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR",
never@3009 2408 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG",
never@3009 2409 "ILL_COPROC", "ILL_BADSTK" };
never@3009 2410
never@3009 2411 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV",
never@3009 2412 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES",
never@3009 2413 "FPE_FLTINV", "FPE_FLTSUB", "FPE_FLTDEN" };
never@3009 2414
never@3009 2415 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" };
never@3009 2416
never@3009 2417 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" };
never@3009 2418
never@3009 2419 void os::print_siginfo(outputStream* st, void* siginfo) {
never@3009 2420 st->print("siginfo:");
never@3009 2421
never@3009 2422 const int buflen = 100;
never@3009 2423 char buf[buflen];
never@3009 2424 siginfo_t *si = (siginfo_t*)siginfo;
never@3009 2425 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen));
never@3009 2426 if (si->si_errno != 0 && strerror_r(si->si_errno, buf, buflen) == 0) {
never@3009 2427 st->print("si_errno=%s", buf);
never@3009 2428 } else {
never@3009 2429 st->print("si_errno=%d", si->si_errno);
never@3009 2430 }
never@3009 2431 const int c = si->si_code;
never@3009 2432 assert(c > 0, "unexpected si_code");
never@3009 2433 switch (si->si_signo) {
never@3009 2434 case SIGILL:
never@3009 2435 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]);
never@3009 2436 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
never@3009 2437 break;
never@3009 2438 case SIGFPE:
never@3009 2439 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]);
never@3009 2440 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
never@3009 2441 break;
never@3009 2442 case SIGSEGV:
never@3009 2443 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]);
never@3009 2444 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
never@3009 2445 break;
never@3009 2446 case SIGBUS:
never@3009 2447 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]);
never@3009 2448 st->print(", si_addr=" PTR_FORMAT, si->si_addr);
never@3009 2449 break;
never@3009 2450 default:
never@3009 2451 st->print(", si_code=%d", si->si_code);
never@3009 2452 // no si_addr
never@3009 2453 }
never@3009 2454
never@3009 2455 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) &&
never@3009 2456 UseSharedSpaces) {
never@3009 2457 FileMapInfo* mapinfo = FileMapInfo::current_info();
never@3009 2458 if (mapinfo->is_in_shared_space(si->si_addr)) {
never@3009 2459 st->print("\n\nError accessing class data sharing archive." \
never@3009 2460 " Mapped file inaccessible during execution, " \
never@3009 2461 " possible disk/network problem.");
never@3009 2462 }
never@3009 2463 }
never@3009 2464 st->cr();
never@3009 2465 }
never@3009 2466
never@3009 2467
never@3009 2468 static void print_signal_handler(outputStream* st, int sig,
never@3009 2469 char* buf, size_t buflen);
never@3009 2470
never@3009 2471 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
never@3009 2472 st->print_cr("Signal Handlers:");
never@3009 2473 print_signal_handler(st, SIGSEGV, buf, buflen);
never@3009 2474 print_signal_handler(st, SIGBUS , buf, buflen);
never@3009 2475 print_signal_handler(st, SIGFPE , buf, buflen);
never@3009 2476 print_signal_handler(st, SIGPIPE, buf, buflen);
never@3009 2477 print_signal_handler(st, SIGXFSZ, buf, buflen);
never@3009 2478 print_signal_handler(st, SIGILL , buf, buflen);
never@3009 2479 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen);
never@3009 2480 print_signal_handler(st, SR_signum, buf, buflen);
never@3009 2481 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
never@3009 2482 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
never@3009 2483 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
never@3009 2484 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
never@3009 2485 }
never@3009 2486
never@3009 2487 static char saved_jvm_path[MAXPATHLEN] = {0};
never@3009 2488
phh@3342 2489 // Find the full path to the current module, libjvm or libjvm_g
never@3009 2490 void os::jvm_path(char *buf, jint buflen) {
never@3009 2491 // Error checking.
never@3009 2492 if (buflen < MAXPATHLEN) {
never@3009 2493 assert(false, "must use a large-enough buffer");
never@3009 2494 buf[0] = '\0';
never@3009 2495 return;
never@3009 2496 }
never@3009 2497 // Lazy resolve the path to current module.
never@3009 2498 if (saved_jvm_path[0] != 0) {
never@3009 2499 strcpy(buf, saved_jvm_path);
never@3009 2500 return;
never@3009 2501 }
never@3009 2502
never@3009 2503 char dli_fname[MAXPATHLEN];
never@3009 2504 bool ret = dll_address_to_library_name(
never@3009 2505 CAST_FROM_FN_PTR(address, os::jvm_path),
never@3009 2506 dli_fname, sizeof(dli_fname), NULL);
never@3009 2507 assert(ret != 0, "cannot locate libjvm");
never@3009 2508 char *rp = realpath(dli_fname, buf);
never@3009 2509 if (rp == NULL)
never@3009 2510 return;
never@3009 2511
never@3009 2512 if (Arguments::created_by_gamma_launcher()) {
never@3009 2513 // Support for the gamma launcher. Typical value for buf is
phh@3342 2514 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm". If "/jre/lib/" appears at
never@3009 2515 // the right place in the string, then assume we are installed in a JDK and
phh@3342 2516 // we're done. Otherwise, check for a JAVA_HOME environment variable and
phh@3342 2517 // construct a path to the JVM being overridden.
phh@3342 2518
never@3009 2519 const char *p = buf + strlen(buf) - 1;
never@3009 2520 for (int count = 0; p > buf && count < 5; ++count) {
never@3009 2521 for (--p; p > buf && *p != '/'; --p)
never@3009 2522 /* empty */ ;
never@3009 2523 }
never@3009 2524
never@3009 2525 if (strncmp(p, "/jre/lib/", 9) != 0) {
never@3009 2526 // Look for JAVA_HOME in the environment.
never@3009 2527 char* java_home_var = ::getenv("JAVA_HOME");
never@3009 2528 if (java_home_var != NULL && java_home_var[0] != 0) {
never@3009 2529 char* jrelib_p;
never@3009 2530 int len;
never@3009 2531
phh@3342 2532 // Check the current module name "libjvm" or "libjvm_g".
never@3009 2533 p = strrchr(buf, '/');
never@3009 2534 assert(strstr(p, "/libjvm") == p, "invalid library name");
never@3009 2535 p = strstr(p, "_g") ? "_g" : "";
never@3009 2536
never@3009 2537 rp = realpath(java_home_var, buf);
never@3009 2538 if (rp == NULL)
never@3009 2539 return;
never@3009 2540
never@3009 2541 // determine if this is a legacy image or modules image
never@3009 2542 // modules image doesn't have "jre" subdirectory
never@3009 2543 len = strlen(buf);
never@3009 2544 jrelib_p = buf + len;
phh@3342 2545
phh@3342 2546 // Add the appropriate library subdir
phh@3342 2547 snprintf(jrelib_p, buflen-len, "/jre/lib");
never@3009 2548 if (0 != access(buf, F_OK)) {
phh@3342 2549 snprintf(jrelib_p, buflen-len, "/lib");
never@3009 2550 }
never@3009 2551
phh@3342 2552 // Add the appropriate client or server subdir
phh@3342 2553 len = strlen(buf);
phh@3342 2554 jrelib_p = buf + len;
phh@3342 2555 snprintf(jrelib_p, buflen-len, "/%s", COMPILER_VARIANT);
phh@3342 2556 if (0 != access(buf, F_OK)) {
phh@3342 2557 snprintf(jrelib_p, buflen-len, "");
phh@3342 2558 }
phh@3342 2559
phh@3342 2560 // If the path exists within JAVA_HOME, add the JVM library name
phh@3342 2561 // to complete the path to JVM being overridden. Otherwise fallback
phh@3342 2562 // to the path to the current library.
never@3009 2563 if (0 == access(buf, F_OK)) {
phh@3342 2564 // Use current module name "libjvm[_g]" instead of
phh@3342 2565 // "libjvm"debug_only("_g")"" since for fastdebug version
phh@3342 2566 // we should have "libjvm" but debug_only("_g") adds "_g"!
never@3009 2567 len = strlen(buf);
phh@3342 2568 snprintf(buf + len, buflen-len, "/libjvm%s%s", p, JNI_LIB_SUFFIX);
never@3009 2569 } else {
phh@3342 2570 // Fall back to path of current library
never@3009 2571 rp = realpath(dli_fname, buf);
never@3009 2572 if (rp == NULL)
never@3009 2573 return;
never@3009 2574 }
never@3009 2575 }
never@3009 2576 }
never@3009 2577 }
never@3009 2578
never@3009 2579 strcpy(saved_jvm_path, buf);
never@3009 2580 }
never@3009 2581
never@3009 2582 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
never@3009 2583 // no prefix required, not even "_"
never@3009 2584 }
never@3009 2585
never@3009 2586 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
never@3009 2587 // no suffix required
never@3009 2588 }
never@3009 2589
never@3009 2590 ////////////////////////////////////////////////////////////////////////////////
never@3009 2591 // sun.misc.Signal support
never@3009 2592
never@3009 2593 static volatile jint sigint_count = 0;
never@3009 2594
never@3009 2595 static void
never@3009 2596 UserHandler(int sig, void *siginfo, void *context) {
never@3009 2597 // 4511530 - sem_post is serialized and handled by the manager thread. When
never@3009 2598 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
never@3009 2599 // don't want to flood the manager thread with sem_post requests.
never@3009 2600 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
never@3009 2601 return;
never@3009 2602
never@3009 2603 // Ctrl-C is pressed during error reporting, likely because the error
never@3009 2604 // handler fails to abort. Let VM die immediately.
never@3009 2605 if (sig == SIGINT && is_error_reported()) {
never@3009 2606 os::die();
never@3009 2607 }
never@3009 2608
never@3009 2609 os::signal_notify(sig);
never@3009 2610 }
never@3009 2611
never@3009 2612 void* os::user_handler() {
never@3009 2613 return CAST_FROM_FN_PTR(void*, UserHandler);
never@3009 2614 }
never@3009 2615
never@3009 2616 extern "C" {
never@3009 2617 typedef void (*sa_handler_t)(int);
never@3009 2618 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
never@3009 2619 }
never@3009 2620
never@3009 2621 void* os::signal(int signal_number, void* handler) {
never@3009 2622 struct sigaction sigAct, oldSigAct;
never@3009 2623
never@3009 2624 sigfillset(&(sigAct.sa_mask));
never@3009 2625 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
never@3009 2626 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
never@3009 2627
never@3009 2628 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
never@3009 2629 // -1 means registration failed
never@3009 2630 return (void *)-1;
never@3009 2631 }
never@3009 2632
never@3009 2633 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
never@3009 2634 }
never@3009 2635
never@3009 2636 void os::signal_raise(int signal_number) {
never@3009 2637 ::raise(signal_number);
never@3009 2638 }
never@3009 2639
never@3009 2640 /*
never@3009 2641 * The following code is moved from os.cpp for making this
never@3009 2642 * code platform specific, which it is by its very nature.
never@3009 2643 */
never@3009 2644
never@3009 2645 // Will be modified when max signal is changed to be dynamic
never@3009 2646 int os::sigexitnum_pd() {
never@3009 2647 return NSIG;
never@3009 2648 }
never@3009 2649
never@3009 2650 // a counter for each possible signal value
never@3009 2651 static volatile jint pending_signals[NSIG+1] = { 0 };
never@3009 2652
never@3009 2653 // Bsd(POSIX) specific hand shaking semaphore.
never@3009 2654 #ifdef __APPLE__
never@3009 2655 static semaphore_t sig_sem;
never@3009 2656 #define SEM_INIT(sem, value) semaphore_create(mach_task_self(), &sem, SYNC_POLICY_FIFO, value)
never@3009 2657 #define SEM_WAIT(sem) semaphore_wait(sem);
never@3009 2658 #define SEM_POST(sem) semaphore_signal(sem);
never@3009 2659 #else
never@3009 2660 static sem_t sig_sem;
never@3009 2661 #define SEM_INIT(sem, value) sem_init(&sem, 0, value)
never@3009 2662 #define SEM_WAIT(sem) sem_wait(&sem);
never@3009 2663 #define SEM_POST(sem) sem_post(&sem);
never@3009 2664 #endif
never@3009 2665
never@3009 2666 void os::signal_init_pd() {
never@3009 2667 // Initialize signal structures
never@3009 2668 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
never@3009 2669
never@3009 2670 // Initialize signal semaphore
never@3009 2671 ::SEM_INIT(sig_sem, 0);
never@3009 2672 }
never@3009 2673
never@3009 2674 void os::signal_notify(int sig) {
never@3009 2675 Atomic::inc(&pending_signals[sig]);
never@3009 2676 ::SEM_POST(sig_sem);
never@3009 2677 }
never@3009 2678
never@3009 2679 static int check_pending_signals(bool wait) {
never@3009 2680 Atomic::store(0, &sigint_count);
never@3009 2681 for (;;) {
never@3009 2682 for (int i = 0; i < NSIG + 1; i++) {
never@3009 2683 jint n = pending_signals[i];
never@3009 2684 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
never@3009 2685 return i;
never@3009 2686 }
never@3009 2687 }
never@3009 2688 if (!wait) {
never@3009 2689 return -1;
never@3009 2690 }
never@3009 2691 JavaThread *thread = JavaThread::current();
never@3009 2692 ThreadBlockInVM tbivm(thread);
never@3009 2693
never@3009 2694 bool threadIsSuspended;
never@3009 2695 do {
never@3009 2696 thread->set_suspend_equivalent();
never@3009 2697 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
never@3009 2698 ::SEM_WAIT(sig_sem);
never@3009 2699
never@3009 2700 // were we externally suspended while we were waiting?
never@3009 2701 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
never@3009 2702 if (threadIsSuspended) {
never@3009 2703 //
never@3009 2704 // The semaphore has been incremented, but while we were waiting
never@3009 2705 // another thread suspended us. We don't want to continue running
never@3009 2706 // while suspended because that would surprise the thread that
never@3009 2707 // suspended us.
never@3009 2708 //
never@3009 2709 ::SEM_POST(sig_sem);
never@3009 2710
never@3009 2711 thread->java_suspend_self();
never@3009 2712 }
never@3009 2713 } while (threadIsSuspended);
never@3009 2714 }
never@3009 2715 }
never@3009 2716
never@3009 2717 int os::signal_lookup() {
never@3009 2718 return check_pending_signals(false);
never@3009 2719 }
never@3009 2720
never@3009 2721 int os::signal_wait() {
never@3009 2722 return check_pending_signals(true);
never@3009 2723 }
never@3009 2724
never@3009 2725 ////////////////////////////////////////////////////////////////////////////////
never@3009 2726 // Virtual Memory
never@3009 2727
never@3009 2728 int os::vm_page_size() {
never@3009 2729 // Seems redundant as all get out
never@3009 2730 assert(os::Bsd::page_size() != -1, "must call os::init");
never@3009 2731 return os::Bsd::page_size();
never@3009 2732 }
never@3009 2733
never@3009 2734 // Solaris allocates memory by pages.
never@3009 2735 int os::vm_allocation_granularity() {
never@3009 2736 assert(os::Bsd::page_size() != -1, "must call os::init");
never@3009 2737 return os::Bsd::page_size();
never@3009 2738 }
never@3009 2739
never@3009 2740 // Rationale behind this function:
never@3009 2741 // current (Mon Apr 25 20:12:18 MSD 2005) oprofile drops samples without executable
never@3009 2742 // mapping for address (see lookup_dcookie() in the kernel module), thus we cannot get
never@3009 2743 // samples for JITted code. Here we create private executable mapping over the code cache
never@3009 2744 // and then we can use standard (well, almost, as mapping can change) way to provide
never@3009 2745 // info for the reporting script by storing timestamp and location of symbol
never@3009 2746 void bsd_wrap_code(char* base, size_t size) {
never@3009 2747 static volatile jint cnt = 0;
never@3009 2748
never@3009 2749 if (!UseOprofile) {
never@3009 2750 return;
never@3009 2751 }
never@3009 2752
never@3009 2753 char buf[PATH_MAX + 1];
never@3009 2754 int num = Atomic::add(1, &cnt);
never@3009 2755
never@3009 2756 snprintf(buf, PATH_MAX + 1, "%s/hs-vm-%d-%d",
never@3009 2757 os::get_temp_directory(), os::current_process_id(), num);
never@3009 2758 unlink(buf);
never@3009 2759
never@3009 2760 int fd = ::open(buf, O_CREAT | O_RDWR, S_IRWXU);
never@3009 2761
never@3009 2762 if (fd != -1) {
never@3009 2763 off_t rv = ::lseek(fd, size-2, SEEK_SET);
never@3009 2764 if (rv != (off_t)-1) {
never@3009 2765 if (::write(fd, "", 1) == 1) {
never@3009 2766 mmap(base, size,
never@3009 2767 PROT_READ|PROT_WRITE|PROT_EXEC,
never@3009 2768 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, fd, 0);
never@3009 2769 }
never@3009 2770 }
never@3009 2771 ::close(fd);
never@3009 2772 unlink(buf);
never@3009 2773 }
never@3009 2774 }
never@3009 2775
never@3009 2776 // NOTE: Bsd kernel does not really reserve the pages for us.
never@3009 2777 // All it does is to check if there are enough free pages
never@3009 2778 // left at the time of mmap(). This could be a potential
never@3009 2779 // problem.
zgu@4135 2780 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
never@3009 2781 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
never@3009 2782 #ifdef __OpenBSD__
never@3009 2783 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
never@3009 2784 return ::mprotect(addr, size, prot) == 0;
never@3009 2785 #else
never@3009 2786 uintptr_t res = (uintptr_t) ::mmap(addr, size, prot,
never@3009 2787 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0);
never@3009 2788 return res != (uintptr_t) MAP_FAILED;
never@3009 2789 #endif
never@3009 2790 }
never@3009 2791
never@3009 2792 #ifndef _ALLBSD_SOURCE
never@3009 2793 // Define MAP_HUGETLB here so we can build HotSpot on old systems.
never@3009 2794 #ifndef MAP_HUGETLB
never@3009 2795 #define MAP_HUGETLB 0x40000
never@3009 2796 #endif
never@3009 2797
never@3009 2798 // Define MADV_HUGEPAGE here so we can build HotSpot on old systems.
never@3009 2799 #ifndef MADV_HUGEPAGE
never@3009 2800 #define MADV_HUGEPAGE 14
never@3009 2801 #endif
never@3009 2802 #endif
never@3009 2803
zgu@4135 2804 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
never@3009 2805 bool exec) {
never@3009 2806 #ifndef _ALLBSD_SOURCE
never@3009 2807 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) {
never@3009 2808 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
never@3009 2809 uintptr_t res =
never@3009 2810 (uintptr_t) ::mmap(addr, size, prot,
never@3009 2811 MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS|MAP_HUGETLB,
never@3009 2812 -1, 0);
never@3009 2813 return res != (uintptr_t) MAP_FAILED;
never@3009 2814 }
never@3009 2815 #endif
never@3009 2816
never@3009 2817 return commit_memory(addr, size, exec);
never@3009 2818 }
never@3009 2819
zgu@4135 2820 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
never@3009 2821 #ifndef _ALLBSD_SOURCE
never@3009 2822 if (UseHugeTLBFS && alignment_hint > (size_t)vm_page_size()) {
never@3009 2823 // We don't check the return value: madvise(MADV_HUGEPAGE) may not
never@3009 2824 // be supported or the memory may already be backed by huge pages.
never@3009 2825 ::madvise(addr, bytes, MADV_HUGEPAGE);
never@3009 2826 }
never@3009 2827 #endif
never@3009 2828 }
never@3009 2829
zgu@4135 2830 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
never@3009 2831 ::madvise(addr, bytes, MADV_DONTNEED);
never@3009 2832 }
never@3009 2833
never@3009 2834 void os::numa_make_global(char *addr, size_t bytes) {
never@3009 2835 }
never@3009 2836
never@3009 2837 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
never@3009 2838 }
never@3009 2839
never@3009 2840 bool os::numa_topology_changed() { return false; }
never@3009 2841
never@3009 2842 size_t os::numa_get_groups_num() {
never@3009 2843 return 1;
never@3009 2844 }
never@3009 2845
never@3009 2846 int os::numa_get_group_id() {
never@3009 2847 return 0;
never@3009 2848 }
never@3009 2849
never@3009 2850 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
never@3009 2851 if (size > 0) {
never@3009 2852 ids[0] = 0;
never@3009 2853 return 1;
never@3009 2854 }
never@3009 2855 return 0;
never@3009 2856 }
never@3009 2857
never@3009 2858 bool os::get_page_info(char *start, page_info* info) {
never@3009 2859 return false;
never@3009 2860 }
never@3009 2861
never@3009 2862 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
never@3009 2863 return end;
never@3009 2864 }
never@3009 2865
never@3009 2866 #ifndef _ALLBSD_SOURCE
never@3009 2867 // Something to do with the numa-aware allocator needs these symbols
never@3009 2868 extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { }
never@3009 2869 extern "C" JNIEXPORT void numa_error(char *where) { }
never@3009 2870 extern "C" JNIEXPORT int fork1() { return fork(); }
never@3009 2871
never@3009 2872
never@3009 2873 // If we are running with libnuma version > 2, then we should
never@3009 2874 // be trying to use symbols with versions 1.1
never@3009 2875 // If we are running with earlier version, which did not have symbol versions,
never@3009 2876 // we should use the base version.
never@3009 2877 void* os::Bsd::libnuma_dlsym(void* handle, const char *name) {
never@3009 2878 void *f = dlvsym(handle, name, "libnuma_1.1");
never@3009 2879 if (f == NULL) {
never@3009 2880 f = dlsym(handle, name);
never@3009 2881 }
never@3009 2882 return f;
never@3009 2883 }
never@3009 2884
never@3009 2885 bool os::Bsd::libnuma_init() {
never@3009 2886 // sched_getcpu() should be in libc.
never@3009 2887 set_sched_getcpu(CAST_TO_FN_PTR(sched_getcpu_func_t,
never@3009 2888 dlsym(RTLD_DEFAULT, "sched_getcpu")));
never@3009 2889
never@3009 2890 if (sched_getcpu() != -1) { // Does it work?
never@3009 2891 void *handle = dlopen("libnuma.so.1", RTLD_LAZY);
never@3009 2892 if (handle != NULL) {
never@3009 2893 set_numa_node_to_cpus(CAST_TO_FN_PTR(numa_node_to_cpus_func_t,
never@3009 2894 libnuma_dlsym(handle, "numa_node_to_cpus")));
never@3009 2895 set_numa_max_node(CAST_TO_FN_PTR(numa_max_node_func_t,
never@3009 2896 libnuma_dlsym(handle, "numa_max_node")));
never@3009 2897 set_numa_available(CAST_TO_FN_PTR(numa_available_func_t,
never@3009 2898 libnuma_dlsym(handle, "numa_available")));
never@3009 2899 set_numa_tonode_memory(CAST_TO_FN_PTR(numa_tonode_memory_func_t,
never@3009 2900 libnuma_dlsym(handle, "numa_tonode_memory")));
never@3009 2901 set_numa_interleave_memory(CAST_TO_FN_PTR(numa_interleave_memory_func_t,
never@3009 2902 libnuma_dlsym(handle, "numa_interleave_memory")));
never@3009 2903
never@3009 2904
never@3009 2905 if (numa_available() != -1) {
never@3009 2906 set_numa_all_nodes((unsigned long*)libnuma_dlsym(handle, "numa_all_nodes"));
never@3009 2907 // Create a cpu -> node mapping
never@3009 2908 _cpu_to_node = new (ResourceObj::C_HEAP) GrowableArray<int>(0, true);
never@3009 2909 rebuild_cpu_to_node_map();
never@3009 2910 return true;
never@3009 2911 }
never@3009 2912 }
never@3009 2913 }
never@3009 2914 return false;
never@3009 2915 }
never@3009 2916
never@3009 2917 // rebuild_cpu_to_node_map() constructs a table mapping cpud id to node id.
never@3009 2918 // The table is later used in get_node_by_cpu().
never@3009 2919 void os::Bsd::rebuild_cpu_to_node_map() {
never@3009 2920 const size_t NCPUS = 32768; // Since the buffer size computation is very obscure
never@3009 2921 // in libnuma (possible values are starting from 16,
never@3009 2922 // and continuing up with every other power of 2, but less
never@3009 2923 // than the maximum number of CPUs supported by kernel), and
never@3009 2924 // is a subject to change (in libnuma version 2 the requirements
never@3009 2925 // are more reasonable) we'll just hardcode the number they use
never@3009 2926 // in the library.
never@3009 2927 const size_t BitsPerCLong = sizeof(long) * CHAR_BIT;
never@3009 2928
never@3009 2929 size_t cpu_num = os::active_processor_count();
never@3009 2930 size_t cpu_map_size = NCPUS / BitsPerCLong;
never@3009 2931 size_t cpu_map_valid_size =
never@3009 2932 MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size);
never@3009 2933
never@3009 2934 cpu_to_node()->clear();
never@3009 2935 cpu_to_node()->at_grow(cpu_num - 1);
never@3009 2936 size_t node_num = numa_get_groups_num();
never@3009 2937
never@3009 2938 unsigned long *cpu_map = NEW_C_HEAP_ARRAY(unsigned long, cpu_map_size);
never@3009 2939 for (size_t i = 0; i < node_num; i++) {
never@3009 2940 if (numa_node_to_cpus(i, cpu_map, cpu_map_size * sizeof(unsigned long)) != -1) {
never@3009 2941 for (size_t j = 0; j < cpu_map_valid_size; j++) {
never@3009 2942 if (cpu_map[j] != 0) {
never@3009 2943 for (size_t k = 0; k < BitsPerCLong; k++) {
never@3009 2944 if (cpu_map[j] & (1UL << k)) {
never@3009 2945 cpu_to_node()->at_put(j * BitsPerCLong + k, i);
never@3009 2946 }
never@3009 2947 }
never@3009 2948 }
never@3009 2949 }
never@3009 2950 }
never@3009 2951 }
never@3009 2952 FREE_C_HEAP_ARRAY(unsigned long, cpu_map);
never@3009 2953 }
never@3009 2954
never@3009 2955 int os::Bsd::get_node_by_cpu(int cpu_id) {
never@3009 2956 if (cpu_to_node() != NULL && cpu_id >= 0 && cpu_id < cpu_to_node()->length()) {
never@3009 2957 return cpu_to_node()->at(cpu_id);
never@3009 2958 }
never@3009 2959 return -1;
never@3009 2960 }
never@3009 2961
never@3009 2962 GrowableArray<int>* os::Bsd::_cpu_to_node;
never@3009 2963 os::Bsd::sched_getcpu_func_t os::Bsd::_sched_getcpu;
never@3009 2964 os::Bsd::numa_node_to_cpus_func_t os::Bsd::_numa_node_to_cpus;
never@3009 2965 os::Bsd::numa_max_node_func_t os::Bsd::_numa_max_node;
never@3009 2966 os::Bsd::numa_available_func_t os::Bsd::_numa_available;
never@3009 2967 os::Bsd::numa_tonode_memory_func_t os::Bsd::_numa_tonode_memory;
never@3009 2968 os::Bsd::numa_interleave_memory_func_t os::Bsd::_numa_interleave_memory;
never@3009 2969 unsigned long* os::Bsd::_numa_all_nodes;
never@3009 2970 #endif
never@3009 2971
zgu@4135 2972 bool os::pd_uncommit_memory(char* addr, size_t size) {
never@3009 2973 #ifdef __OpenBSD__
never@3009 2974 // XXX: Work-around mmap/MAP_FIXED bug temporarily on OpenBSD
never@3009 2975 return ::mprotect(addr, size, PROT_NONE) == 0;
never@3009 2976 #else
never@3009 2977 uintptr_t res = (uintptr_t) ::mmap(addr, size, PROT_NONE,
never@3009 2978 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE|MAP_ANONYMOUS, -1, 0);
never@3009 2979 return res != (uintptr_t) MAP_FAILED;
never@3009 2980 #endif
never@3009 2981 }
never@3009 2982
zgu@4135 2983 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
never@3009 2984 return os::commit_memory(addr, size);
never@3009 2985 }
never@3009 2986
never@3009 2987 // If this is a growable mapping, remove the guard pages entirely by
never@3009 2988 // munmap()ping them. If not, just call uncommit_memory().
never@3009 2989 bool os::remove_stack_guard_pages(char* addr, size_t size) {
never@3009 2990 return os::uncommit_memory(addr, size);
never@3009 2991 }
never@3009 2992
never@3009 2993 static address _highest_vm_reserved_address = NULL;
never@3009 2994
never@3009 2995 // If 'fixed' is true, anon_mmap() will attempt to reserve anonymous memory
never@3009 2996 // at 'requested_addr'. If there are existing memory mappings at the same
never@3009 2997 // location, however, they will be overwritten. If 'fixed' is false,
never@3009 2998 // 'requested_addr' is only treated as a hint, the return value may or
never@3009 2999 // may not start from the requested address. Unlike Bsd mmap(), this
never@3009 3000 // function returns NULL to indicate failure.
never@3009 3001 static char* anon_mmap(char* requested_addr, size_t bytes, bool fixed) {
never@3009 3002 char * addr;
never@3009 3003 int flags;
never@3009 3004
never@3009 3005 flags = MAP_PRIVATE | MAP_NORESERVE | MAP_ANONYMOUS;
never@3009 3006 if (fixed) {
never@3009 3007 assert((uintptr_t)requested_addr % os::Bsd::page_size() == 0, "unaligned address");
never@3009 3008 flags |= MAP_FIXED;
never@3009 3009 }
never@3009 3010
never@3009 3011 // Map uncommitted pages PROT_READ and PROT_WRITE, change access
never@3009 3012 // to PROT_EXEC if executable when we commit the page.
never@3009 3013 addr = (char*)::mmap(requested_addr, bytes, PROT_READ|PROT_WRITE,
never@3009 3014 flags, -1, 0);
never@3009 3015
never@3009 3016 if (addr != MAP_FAILED) {
never@3009 3017 // anon_mmap() should only get called during VM initialization,
never@3009 3018 // don't need lock (actually we can skip locking even it can be called
never@3009 3019 // from multiple threads, because _highest_vm_reserved_address is just a
never@3009 3020 // hint about the upper limit of non-stack memory regions.)
never@3009 3021 if ((address)addr + bytes > _highest_vm_reserved_address) {
never@3009 3022 _highest_vm_reserved_address = (address)addr + bytes;
never@3009 3023 }
never@3009 3024 }
never@3009 3025
never@3009 3026 return addr == MAP_FAILED ? NULL : addr;
never@3009 3027 }
never@3009 3028
never@3009 3029 // Don't update _highest_vm_reserved_address, because there might be memory
never@3009 3030 // regions above addr + size. If so, releasing a memory region only creates
never@3009 3031 // a hole in the address space, it doesn't help prevent heap-stack collision.
never@3009 3032 //
never@3009 3033 static int anon_munmap(char * addr, size_t size) {
never@3009 3034 return ::munmap(addr, size) == 0;
never@3009 3035 }
never@3009 3036
zgu@4135 3037 char* os::pd_reserve_memory(size_t bytes, char* requested_addr,
never@3009 3038 size_t alignment_hint) {
never@3009 3039 return anon_mmap(requested_addr, bytes, (requested_addr != NULL));
never@3009 3040 }
never@3009 3041
zgu@4135 3042 bool os::pd_release_memory(char* addr, size_t size) {
never@3009 3043 return anon_munmap(addr, size);
never@3009 3044 }
never@3009 3045
never@3009 3046 static address highest_vm_reserved_address() {
never@3009 3047 return _highest_vm_reserved_address;
never@3009 3048 }
never@3009 3049
never@3009 3050 static bool bsd_mprotect(char* addr, size_t size, int prot) {
never@3009 3051 // Bsd wants the mprotect address argument to be page aligned.
never@3009 3052 char* bottom = (char*)align_size_down((intptr_t)addr, os::Bsd::page_size());
never@3009 3053
never@3009 3054 // According to SUSv3, mprotect() should only be used with mappings
never@3009 3055 // established by mmap(), and mmap() always maps whole pages. Unaligned
never@3009 3056 // 'addr' likely indicates problem in the VM (e.g. trying to change
never@3009 3057 // protection of malloc'ed or statically allocated memory). Check the
never@3009 3058 // caller if you hit this assert.
never@3009 3059 assert(addr == bottom, "sanity check");
never@3009 3060
never@3009 3061 size = align_size_up(pointer_delta(addr, bottom, 1) + size, os::Bsd::page_size());
never@3009 3062 return ::mprotect(bottom, size, prot) == 0;
never@3009 3063 }
never@3009 3064
never@3009 3065 // Set protections specified
never@3009 3066 bool os::protect_memory(char* addr, size_t bytes, ProtType prot,
never@3009 3067 bool is_committed) {
never@3009 3068 unsigned int p = 0;
never@3009 3069 switch (prot) {
never@3009 3070 case MEM_PROT_NONE: p = PROT_NONE; break;
never@3009 3071 case MEM_PROT_READ: p = PROT_READ; break;
never@3009 3072 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
never@3009 3073 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
never@3009 3074 default:
never@3009 3075 ShouldNotReachHere();
never@3009 3076 }
never@3009 3077 // is_committed is unused.
never@3009 3078 return bsd_mprotect(addr, bytes, p);
never@3009 3079 }
never@3009 3080
never@3009 3081 bool os::guard_memory(char* addr, size_t size) {
never@3009 3082 return bsd_mprotect(addr, size, PROT_NONE);
never@3009 3083 }
never@3009 3084
never@3009 3085 bool os::unguard_memory(char* addr, size_t size) {
never@3009 3086 return bsd_mprotect(addr, size, PROT_READ|PROT_WRITE);
never@3009 3087 }
never@3009 3088
never@3009 3089 bool os::Bsd::hugetlbfs_sanity_check(bool warn, size_t page_size) {
never@3009 3090 bool result = false;
never@3009 3091 #ifndef _ALLBSD_SOURCE
never@3009 3092 void *p = mmap (NULL, page_size, PROT_READ|PROT_WRITE,
never@3009 3093 MAP_ANONYMOUS|MAP_PRIVATE|MAP_HUGETLB,
never@3009 3094 -1, 0);
never@3009 3095
never@3009 3096 if (p != (void *) -1) {
never@3009 3097 // We don't know if this really is a huge page or not.
never@3009 3098 FILE *fp = fopen("/proc/self/maps", "r");
never@3009 3099 if (fp) {
never@3009 3100 while (!feof(fp)) {
never@3009 3101 char chars[257];
never@3009 3102 long x = 0;
never@3009 3103 if (fgets(chars, sizeof(chars), fp)) {
never@3009 3104 if (sscanf(chars, "%lx-%*x", &x) == 1
never@3009 3105 && x == (long)p) {
never@3009 3106 if (strstr (chars, "hugepage")) {
never@3009 3107 result = true;
never@3009 3108 break;
never@3009 3109 }
never@3009 3110 }
never@3009 3111 }
never@3009 3112 }
never@3009 3113 fclose(fp);
never@3009 3114 }
never@3009 3115 munmap (p, page_size);
never@3009 3116 if (result)
never@3009 3117 return true;
never@3009 3118 }
never@3009 3119
never@3009 3120 if (warn) {
never@3009 3121 warning("HugeTLBFS is not supported by the operating system.");
never@3009 3122 }
never@3009 3123 #endif
never@3009 3124
never@3009 3125 return result;
never@3009 3126 }
never@3009 3127
never@3009 3128 /*
never@3009 3129 * Set the coredump_filter bits to include largepages in core dump (bit 6)
never@3009 3130 *
never@3009 3131 * From the coredump_filter documentation:
never@3009 3132 *
never@3009 3133 * - (bit 0) anonymous private memory
never@3009 3134 * - (bit 1) anonymous shared memory
never@3009 3135 * - (bit 2) file-backed private memory
never@3009 3136 * - (bit 3) file-backed shared memory
never@3009 3137 * - (bit 4) ELF header pages in file-backed private memory areas (it is
never@3009 3138 * effective only if the bit 2 is cleared)
never@3009 3139 * - (bit 5) hugetlb private memory
never@3009 3140 * - (bit 6) hugetlb shared memory
never@3009 3141 */
never@3009 3142 static void set_coredump_filter(void) {
never@3009 3143 FILE *f;
never@3009 3144 long cdm;
never@3009 3145
never@3009 3146 if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) {
never@3009 3147 return;
never@3009 3148 }
never@3009 3149
never@3009 3150 if (fscanf(f, "%lx", &cdm) != 1) {
never@3009 3151 fclose(f);
never@3009 3152 return;
never@3009 3153 }
never@3009 3154
never@3009 3155 rewind(f);
never@3009 3156
never@3009 3157 if ((cdm & LARGEPAGES_BIT) == 0) {
never@3009 3158 cdm |= LARGEPAGES_BIT;
never@3009 3159 fprintf(f, "%#lx", cdm);
never@3009 3160 }
never@3009 3161
never@3009 3162 fclose(f);
never@3009 3163 }
never@3009 3164
never@3009 3165 // Large page support
never@3009 3166
never@3009 3167 static size_t _large_page_size = 0;
never@3009 3168
never@3009 3169 void os::large_page_init() {
never@3009 3170 #ifndef _ALLBSD_SOURCE
never@3009 3171 if (!UseLargePages) {
never@3009 3172 UseHugeTLBFS = false;
never@3009 3173 UseSHM = false;
never@3009 3174 return;
never@3009 3175 }
never@3009 3176
never@3009 3177 if (FLAG_IS_DEFAULT(UseHugeTLBFS) && FLAG_IS_DEFAULT(UseSHM)) {
never@3009 3178 // If UseLargePages is specified on the command line try both methods,
never@3009 3179 // if it's default, then try only HugeTLBFS.
never@3009 3180 if (FLAG_IS_DEFAULT(UseLargePages)) {
never@3009 3181 UseHugeTLBFS = true;
never@3009 3182 } else {
never@3009 3183 UseHugeTLBFS = UseSHM = true;
never@3009 3184 }
never@3009 3185 }
never@3009 3186
never@3009 3187 if (LargePageSizeInBytes) {
never@3009 3188 _large_page_size = LargePageSizeInBytes;
never@3009 3189 } else {
never@3009 3190 // large_page_size on Bsd is used to round up heap size. x86 uses either
never@3009 3191 // 2M or 4M page, depending on whether PAE (Physical Address Extensions)
never@3009 3192 // mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. IA64 can use
never@3009 3193 // page as large as 256M.
never@3009 3194 //
never@3009 3195 // Here we try to figure out page size by parsing /proc/meminfo and looking
never@3009 3196 // for a line with the following format:
never@3009 3197 // Hugepagesize: 2048 kB
never@3009 3198 //
never@3009 3199 // If we can't determine the value (e.g. /proc is not mounted, or the text
never@3009 3200 // format has been changed), we'll use the largest page size supported by
never@3009 3201 // the processor.
never@3009 3202
never@3009 3203 #ifndef ZERO
never@3009 3204 _large_page_size = IA32_ONLY(4 * M) AMD64_ONLY(2 * M) IA64_ONLY(256 * M) SPARC_ONLY(4 * M)
never@3009 3205 ARM_ONLY(2 * M) PPC_ONLY(4 * M);
never@3009 3206 #endif // ZERO
never@3009 3207
never@3009 3208 FILE *fp = fopen("/proc/meminfo", "r");
never@3009 3209 if (fp) {
never@3009 3210 while (!feof(fp)) {
never@3009 3211 int x = 0;
never@3009 3212 char buf[16];
never@3009 3213 if (fscanf(fp, "Hugepagesize: %d", &x) == 1) {
never@3009 3214 if (x && fgets(buf, sizeof(buf), fp) && strcmp(buf, " kB\n") == 0) {
never@3009 3215 _large_page_size = x * K;
never@3009 3216 break;
never@3009 3217 }
never@3009 3218 } else {
never@3009 3219 // skip to next line
never@3009 3220 for (;;) {
never@3009 3221 int ch = fgetc(fp);
never@3009 3222 if (ch == EOF || ch == (int)'\n') break;
never@3009 3223 }
never@3009 3224 }
never@3009 3225 }
never@3009 3226 fclose(fp);
never@3009 3227 }
never@3009 3228 }
never@3009 3229
never@3009 3230 // print a warning if any large page related flag is specified on command line
never@3009 3231 bool warn_on_failure = !FLAG_IS_DEFAULT(UseHugeTLBFS);
never@3009 3232
never@3009 3233 const size_t default_page_size = (size_t)Bsd::page_size();
never@3009 3234 if (_large_page_size > default_page_size) {
never@3009 3235 _page_sizes[0] = _large_page_size;
never@3009 3236 _page_sizes[1] = default_page_size;
never@3009 3237 _page_sizes[2] = 0;
never@3009 3238 }
never@3009 3239 UseHugeTLBFS = UseHugeTLBFS &&
never@3009 3240 Bsd::hugetlbfs_sanity_check(warn_on_failure, _large_page_size);
never@3009 3241
never@3009 3242 if (UseHugeTLBFS)
never@3009 3243 UseSHM = false;
never@3009 3244
never@3009 3245 UseLargePages = UseHugeTLBFS || UseSHM;
never@3009 3246
never@3009 3247 set_coredump_filter();
never@3009 3248 #endif
never@3009 3249 }
never@3009 3250
never@3009 3251 #ifndef _ALLBSD_SOURCE
never@3009 3252 #ifndef SHM_HUGETLB
never@3009 3253 #define SHM_HUGETLB 04000
never@3009 3254 #endif
never@3009 3255 #endif
never@3009 3256
never@3009 3257 char* os::reserve_memory_special(size_t bytes, char* req_addr, bool exec) {
never@3009 3258 // "exec" is passed in but not used. Creating the shared image for
never@3009 3259 // the code cache doesn't have an SHM_X executable permission to check.
never@3009 3260 assert(UseLargePages && UseSHM, "only for SHM large pages");
never@3009 3261
never@3009 3262 key_t key = IPC_PRIVATE;
never@3009 3263 char *addr;
never@3009 3264
never@3009 3265 bool warn_on_failure = UseLargePages &&
never@3009 3266 (!FLAG_IS_DEFAULT(UseLargePages) ||
never@3009 3267 !FLAG_IS_DEFAULT(LargePageSizeInBytes)
never@3009 3268 );
never@3009 3269 char msg[128];
never@3009 3270
never@3009 3271 // Create a large shared memory region to attach to based on size.
never@3009 3272 // Currently, size is the total size of the heap
never@3009 3273 #ifndef _ALLBSD_SOURCE
never@3009 3274 int shmid = shmget(key, bytes, SHM_HUGETLB|IPC_CREAT|SHM_R|SHM_W);
never@3009 3275 #else
never@3009 3276 int shmid = shmget(key, bytes, IPC_CREAT|SHM_R|SHM_W);
never@3009 3277 #endif
never@3009 3278 if (shmid == -1) {
never@3009 3279 // Possible reasons for shmget failure:
never@3009 3280 // 1. shmmax is too small for Java heap.
never@3009 3281 // > check shmmax value: cat /proc/sys/kernel/shmmax
never@3009 3282 // > increase shmmax value: echo "0xffffffff" > /proc/sys/kernel/shmmax
never@3009 3283 // 2. not enough large page memory.
never@3009 3284 // > check available large pages: cat /proc/meminfo
never@3009 3285 // > increase amount of large pages:
never@3009 3286 // echo new_value > /proc/sys/vm/nr_hugepages
never@3009 3287 // Note 1: different Bsd may use different name for this property,
never@3009 3288 // e.g. on Redhat AS-3 it is "hugetlb_pool".
never@3009 3289 // Note 2: it's possible there's enough physical memory available but
never@3009 3290 // they are so fragmented after a long run that they can't
never@3009 3291 // coalesce into large pages. Try to reserve large pages when
never@3009 3292 // the system is still "fresh".
never@3009 3293 if (warn_on_failure) {
never@3009 3294 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno);
never@3009 3295 warning(msg);
never@3009 3296 }
never@3009 3297 return NULL;
never@3009 3298 }
never@3009 3299
never@3009 3300 // attach to the region
never@3009 3301 addr = (char*)shmat(shmid, req_addr, 0);
never@3009 3302 int err = errno;
never@3009 3303
never@3009 3304 // Remove shmid. If shmat() is successful, the actual shared memory segment
never@3009 3305 // will be deleted when it's detached by shmdt() or when the process
never@3009 3306 // terminates. If shmat() is not successful this will remove the shared
never@3009 3307 // segment immediately.
never@3009 3308 shmctl(shmid, IPC_RMID, NULL);
never@3009 3309
never@3009 3310 if ((intptr_t)addr == -1) {
never@3009 3311 if (warn_on_failure) {
never@3009 3312 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err);
never@3009 3313 warning(msg);
never@3009 3314 }
never@3009 3315 return NULL;
never@3009 3316 }
never@3009 3317
never@3009 3318 return addr;
never@3009 3319 }
never@3009 3320
never@3009 3321 bool os::release_memory_special(char* base, size_t bytes) {
never@3009 3322 // detaching the SHM segment will also delete it, see reserve_memory_special()
never@3009 3323 int rslt = shmdt(base);
never@3009 3324 return rslt == 0;
never@3009 3325 }
never@3009 3326
never@3009 3327 size_t os::large_page_size() {
never@3009 3328 return _large_page_size;
never@3009 3329 }
never@3009 3330
never@3009 3331 // HugeTLBFS allows application to commit large page memory on demand;
never@3009 3332 // with SysV SHM the entire memory region must be allocated as shared
never@3009 3333 // memory.
never@3009 3334 bool os::can_commit_large_page_memory() {
never@3009 3335 return UseHugeTLBFS;
never@3009 3336 }
never@3009 3337
never@3009 3338 bool os::can_execute_large_page_memory() {
never@3009 3339 return UseHugeTLBFS;
never@3009 3340 }
never@3009 3341
never@3009 3342 // Reserve memory at an arbitrary address, only if that area is
never@3009 3343 // available (and not reserved for something else).
never@3009 3344
zgu@4135 3345 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
never@3009 3346 const int max_tries = 10;
never@3009 3347 char* base[max_tries];
never@3009 3348 size_t size[max_tries];
never@3009 3349 const size_t gap = 0x000000;
never@3009 3350
never@3009 3351 // Assert only that the size is a multiple of the page size, since
never@3009 3352 // that's all that mmap requires, and since that's all we really know
never@3009 3353 // about at this low abstraction level. If we need higher alignment,
never@3009 3354 // we can either pass an alignment to this method or verify alignment
never@3009 3355 // in one of the methods further up the call chain. See bug 5044738.
never@3009 3356 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block");
never@3009 3357
never@3009 3358 // Repeatedly allocate blocks until the block is allocated at the
never@3009 3359 // right spot. Give up after max_tries. Note that reserve_memory() will
never@3009 3360 // automatically update _highest_vm_reserved_address if the call is
never@3009 3361 // successful. The variable tracks the highest memory address every reserved
never@3009 3362 // by JVM. It is used to detect heap-stack collision if running with
never@3009 3363 // fixed-stack BsdThreads. Because here we may attempt to reserve more
never@3009 3364 // space than needed, it could confuse the collision detecting code. To
never@3009 3365 // solve the problem, save current _highest_vm_reserved_address and
never@3009 3366 // calculate the correct value before return.
never@3009 3367 address old_highest = _highest_vm_reserved_address;
never@3009 3368
never@3009 3369 // Bsd mmap allows caller to pass an address as hint; give it a try first,
never@3009 3370 // if kernel honors the hint then we can return immediately.
never@3009 3371 char * addr = anon_mmap(requested_addr, bytes, false);
never@3009 3372 if (addr == requested_addr) {
never@3009 3373 return requested_addr;
never@3009 3374 }
never@3009 3375
never@3009 3376 if (addr != NULL) {
never@3009 3377 // mmap() is successful but it fails to reserve at the requested address
never@3009 3378 anon_munmap(addr, bytes);
never@3009 3379 }
never@3009 3380
never@3009 3381 int i;
never@3009 3382 for (i = 0; i < max_tries; ++i) {
never@3009 3383 base[i] = reserve_memory(bytes);
never@3009 3384
never@3009 3385 if (base[i] != NULL) {
never@3009 3386 // Is this the block we wanted?
never@3009 3387 if (base[i] == requested_addr) {
never@3009 3388 size[i] = bytes;
never@3009 3389 break;
never@3009 3390 }
never@3009 3391
never@3009 3392 // Does this overlap the block we wanted? Give back the overlapped
never@3009 3393 // parts and try again.
never@3009 3394
never@3009 3395 size_t top_overlap = requested_addr + (bytes + gap) - base[i];
never@3009 3396 if (top_overlap >= 0 && top_overlap < bytes) {
never@3009 3397 unmap_memory(base[i], top_overlap);
never@3009 3398 base[i] += top_overlap;
never@3009 3399 size[i] = bytes - top_overlap;
never@3009 3400 } else {
never@3009 3401 size_t bottom_overlap = base[i] + bytes - requested_addr;
never@3009 3402 if (bottom_overlap >= 0 && bottom_overlap < bytes) {
never@3009 3403 unmap_memory(requested_addr, bottom_overlap);
never@3009 3404 size[i] = bytes - bottom_overlap;
never@3009 3405 } else {
never@3009 3406 size[i] = bytes;
never@3009 3407 }
never@3009 3408 }
never@3009 3409 }
never@3009 3410 }
never@3009 3411
never@3009 3412 // Give back the unused reserved pieces.
never@3009 3413
never@3009 3414 for (int j = 0; j < i; ++j) {
never@3009 3415 if (base[j] != NULL) {
never@3009 3416 unmap_memory(base[j], size[j]);
never@3009 3417 }
never@3009 3418 }
never@3009 3419
never@3009 3420 if (i < max_tries) {
never@3009 3421 _highest_vm_reserved_address = MAX2(old_highest, (address)requested_addr + bytes);
never@3009 3422 return requested_addr;
never@3009 3423 } else {
never@3009 3424 _highest_vm_reserved_address = old_highest;
never@3009 3425 return NULL;
never@3009 3426 }
never@3009 3427 }
never@3009 3428
never@3009 3429 size_t os::read(int fd, void *buf, unsigned int nBytes) {
never@3009 3430 RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
never@3009 3431 }
never@3009 3432
never@3009 3433 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation.
never@3009 3434 // Solaris uses poll(), bsd uses park().
never@3009 3435 // Poll() is likely a better choice, assuming that Thread.interrupt()
never@3009 3436 // generates a SIGUSRx signal. Note that SIGUSR1 can interfere with
never@3009 3437 // SIGSEGV, see 4355769.
never@3009 3438
never@3009 3439 int os::sleep(Thread* thread, jlong millis, bool interruptible) {
never@3009 3440 assert(thread == Thread::current(), "thread consistency check");
never@3009 3441
never@3009 3442 ParkEvent * const slp = thread->_SleepEvent ;
never@3009 3443 slp->reset() ;
never@3009 3444 OrderAccess::fence() ;
never@3009 3445
never@3009 3446 if (interruptible) {
never@3009 3447 jlong prevtime = javaTimeNanos();
never@3009 3448
never@3009 3449 for (;;) {
never@3009 3450 if (os::is_interrupted(thread, true)) {
never@3009 3451 return OS_INTRPT;
never@3009 3452 }
never@3009 3453
never@3009 3454 jlong newtime = javaTimeNanos();
never@3009 3455
never@3009 3456 if (newtime - prevtime < 0) {
never@3009 3457 // time moving backwards, should only happen if no monotonic clock
never@3009 3458 // not a guarantee() because JVM should not abort on kernel/glibc bugs
never@3009 3459 assert(!Bsd::supports_monotonic_clock(), "time moving backwards");
never@3009 3460 } else {
johnc@3201 3461 millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
never@3009 3462 }
never@3009 3463
never@3009 3464 if(millis <= 0) {
never@3009 3465 return OS_OK;
never@3009 3466 }
never@3009 3467
never@3009 3468 prevtime = newtime;
never@3009 3469
never@3009 3470 {
never@3009 3471 assert(thread->is_Java_thread(), "sanity check");
never@3009 3472 JavaThread *jt = (JavaThread *) thread;
never@3009 3473 ThreadBlockInVM tbivm(jt);
never@3009 3474 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
never@3009 3475
never@3009 3476 jt->set_suspend_equivalent();
never@3009 3477 // cleared by handle_special_suspend_equivalent_condition() or
never@3009 3478 // java_suspend_self() via check_and_wait_while_suspended()
never@3009 3479
never@3009 3480 slp->park(millis);
never@3009 3481