示例#1
0
/* Get current value of timer TIMERID and store it in VLAUE.  */
int
timer_gettime (timer_t timerid, struct itimerspec *value)
{
  struct timer_node *timer;
  struct timespec now, expiry;
  int retval = -1, armed = 0, valid;
  clock_t clock = 0;

  pthread_mutex_lock (&__timer_mutex);

  timer = timer_id2ptr (timerid);
  valid = timer_valid (timer);

  if (valid) {
    armed = timer->armed;
    expiry = timer->expirytime;
    clock = timer->clock;
    value->it_interval = timer->value.it_interval;
  }

  pthread_mutex_unlock (&__timer_mutex);

  if (valid)
    {
      if (armed)
	{
	  clock_gettime (clock, &now);
	  if (timespec_compare (&now, &expiry) < 0)
	    timespec_sub (&value->it_value, &expiry, &now);
	  else
	    {
	      value->it_value.tv_sec = 0;
	      value->it_value.tv_nsec = 0;
	    }
	}
      else
	{
	  value->it_value.tv_sec = 0;
	  value->it_value.tv_nsec = 0;
	}

      retval = 0;
    }
  else
    __set_errno (EINVAL);

  return retval;
}
示例#2
0
/* Get expiration overrun for timer TIMERID.  */
int
timer_getoverrun (timer_t timerid)
{
  struct timer_node *timer;
  int retval = -1;

  pthread_mutex_lock (&__timer_mutex);

  if (! timer_valid (timer = timer_id2ptr (timerid)))
    __set_errno (EINVAL);
  else
    retval = timer->overrun_count;

  pthread_mutex_unlock (&__timer_mutex);

  return retval;
}
示例#3
0
/* Delete timer TIMERID.  */
int
timer_delete (
     timer_t timerid)
{
  struct timer_node *timer;
  int retval = -1;

  pthread_mutex_lock (&__timer_mutex);

  timer = timer_id2ptr (timerid);
  if (! timer_valid (timer))
    /* Invalid timer ID or the timer is not in use.  */
    __set_errno (EINVAL);
  else
    {
      if (timer->armed && timer->thread != NULL)
	{
	  struct thread_node *thread = timer->thread;
	  assert (thread != NULL);

	  /* If thread is cancelled while waiting for handler to terminate,
	     the mutex is unlocked and timer_delete is aborted.  */
	  pthread_cleanup_push (__timer_mutex_cancel_handler, &__timer_mutex);

	  /* If timer is currently being serviced, wait for it to finish.  */
	  while (thread->current_timer == timer)
	    pthread_cond_wait (&thread->cond, &__timer_mutex);

	  pthread_cleanup_pop (0);
        }

      /* Remove timer from whatever queue it may be on and deallocate it.  */
      timer->inuse = TIMER_DELETED;
      list_unlink_ip (&timer->links);
      timer_delref (timer);
      retval = 0;
    }

  pthread_mutex_unlock (&__timer_mutex);

  return retval;
}
示例#4
0
/* Set timer TIMERID to VALUE, returning old value in OVLAUE.  */
int
timer_settime (timer_t timerid, int flags, const struct itimerspec *value,
	       struct itimerspec *ovalue)
{
  struct timer_node *timer;
  struct thread_node *thread = NULL;
  struct timespec now;
  int have_now = 0, need_wakeup = 0;
  int retval = -1;

  timer = timer_id2ptr (timerid);
  if (timer == NULL)
    {
      __set_errno (EINVAL);
      goto bail;
    }

  if (value->it_interval.tv_nsec < 0
      || value->it_interval.tv_nsec >= 1000000000
      || value->it_value.tv_nsec < 0
      || value->it_value.tv_nsec >= 1000000000)
    {
      __set_errno (EINVAL);
      goto bail;
    }

  /* Will need to know current time since this is a relative timer;
     might as well make the system call outside of the lock now! */

  if ((flags & TIMER_ABSTIME) == 0)
    {
      clock_gettime (timer->clock, &now);
      have_now = 1;
    }

  pthread_mutex_lock (&__timer_mutex);
  timer_addref (timer);

  /* One final check of timer validity; this one is possible only
     until we have the mutex, because it accesses the inuse flag. */

  if (! timer_valid(timer))
    {
      __set_errno (EINVAL);
      goto unlock_bail;
    }

  if (ovalue != NULL)
    {
      ovalue->it_interval = timer->value.it_interval;

      if (timer->armed)
	{
	  if (! have_now)
	    {
	      pthread_mutex_unlock (&__timer_mutex);
	      clock_gettime (timer->clock, &now);
	      have_now = 1;
	      pthread_mutex_lock (&__timer_mutex);
	      timer_addref (timer);
	    }

	  timespec_sub (&ovalue->it_value, &timer->expirytime, &now);
	}
      else
	{
	  ovalue->it_value.tv_sec = 0;
	  ovalue->it_value.tv_nsec = 0;
	}
    }

  timer->value = *value;

  list_unlink_ip (&timer->links);
  timer->armed = 0;

  thread = timer->thread;

  /* A value of { 0, 0 } causes the timer to be stopped. */
  if (value->it_value.tv_sec != 0
      || __builtin_expect (value->it_value.tv_nsec != 0, 1))
    {
      if ((flags & TIMER_ABSTIME) != 0)
	/* The user specified the expiration time.  */
	timer->expirytime = value->it_value;
      else
	timespec_add (&timer->expirytime, &now, &value->it_value);

      /* Only need to wake up the thread if timer is inserted
	 at the head of the queue. */
      if (thread != NULL)
	need_wakeup = __timer_thread_queue_timer (thread, timer);
      timer->armed = 1;
    }

  retval = 0;

unlock_bail:
  timer_delref (timer);
  pthread_mutex_unlock (&__timer_mutex);

bail:
  if (thread != NULL && need_wakeup)
    __timer_thread_wakeup (thread);

  return retval;
}