os::sigexitnum_pd()

-

//Linux版(jdk7/hotspot/src/os/linux/vm/os_linux.cpp)
// Will be modified when max signal is changed to be dynamic
int os::sigexitnum_pd() {
  return NSIG;
}

os::init_random(long initval)

-

//Linux版(jdk7/hotspot/src/share/vm/runtime/os.cpp)
void os::init_random(long initval) {
  _rand_seed = initval;
}

os::os_exception_wrapper(...)

-

//Linux版(jdk7/hotspot/src/os/linux/vm/os_linux.cpp)
// This does not do anything on Linux. This is basically a hook for being
// able to use structured exception handling (thread-local exception filters)
// on, e.g., Win32.
void
os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method,
                         JavaCallArguments* args, Thread* thread) {
  f(value, method, args, thread);
}

os::check_or_create_dump(...)

-

//Linux版(jdk7/hotspot/src/os/posix/vm/os_posix.cpp)
// Check core dump limit and report possible place where core can be found
void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) {
  struct rlimit rlim;
  static char cwd[O_BUFLEN];
  bool success;

  get_current_directory(cwd, sizeof(cwd));

  if (getrlimit(RLIMIT_CORE, &rlim) != 0) {
    jio_snprintf(buffer, bufferSize, "%s/core or core.%d (may not exist)", cwd, current_process_id());
    success = true;
  } else {
    switch(rlim.rlim_cur) {
      case RLIM_INFINITY:
        jio_snprintf(buffer, bufferSize, "%s/core or core.%d", cwd, current_process_id());
        success = true;
        break;
      case 0:
        jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again");
        success = false;
        break;
      default:
        jio_snprintf(buffer, bufferSize, "%s/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", cwd, current_process_id(), (unsigned long)(rlim.rlim_cur >> 10));
        success = true;
        break;
    }
  }
  VMError::report_coredump_status(buffer, success);
}

■

-

//Linux版(jdk7/hotspot/src/os/linux/vm/os_linux.cpp)

os::current_thread_cpu_time(bool user_sys_cpu_time)

-

//Linux版(jdk7/hotspot/src/os/linux/vm/os_linux.cpp)
jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
  if (user_sys_cpu_time && os::Linux::supports_fast_thread_cpu_time()) {
    return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID);
  } else {
    return slow_thread_cpu_time(Thread::current(), user_sys_cpu_time);
  }
}

os::current_thread_cpu_time()

-

//Linux版(jdk7/hotspot/src/os/linux/vm/os_linux.cpp)
jlong os::current_thread_cpu_time() {
  if (os::Linux::supports_fast_thread_cpu_time()) {
    return os::Linux::fast_thread_cpu_time(CLOCK_THREAD_CPUTIME_ID);
  } else {
    // return user + sys since the cost is the same
    return slow_thread_cpu_time(Thread::current(), true /* user + sys */);
  }
}