/* 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;
}
/* Create new per-process timer using CLOCK. */
int
timer_create (
clockid_t clock_id,
struct sigevent *evp,
timer_t *timerid)
{
int retval = -1;
struct timer_node *newtimer = NULL;
struct thread_node *thread = NULL;
if (0
#if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0
|| clock_id == CLOCK_PROCESS_CPUTIME_ID
#endif
#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
|| clock_id == CLOCK_THREAD_CPUTIME_ID
#endif
)
{
/* We don't allow timers for CPU clocks. At least not in the
moment. */
__set_errno (ENOTSUP);
return -1;
}
if (clock_id != CLOCK_REALTIME)
{
__set_errno (EINVAL);
return -1;
}
pthread_once (&__timer_init_once_control, __timer_init_once);
if (__timer_init_failed)
{
__set_errno (ENOMEM);
return -1;
}
pthread_mutex_lock (&__timer_mutex);
newtimer = __timer_alloc ();
if (__builtin_expect (newtimer == NULL, 0))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
if (evp != NULL)
newtimer->event = *evp;
else
{
newtimer->event.sigev_notify = SIGEV_SIGNAL;
newtimer->event.sigev_signo = SIGALRM;
newtimer->event.sigev_value.sival_ptr = timer_ptr2id (newtimer);
newtimer->event.sigev_notify_function = 0;
}
newtimer->event.sigev_notify_attributes = &newtimer->attr;
newtimer->creator_pid = getpid ();
switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL))
{
case SIGEV_NONE:
case SIGEV_SIGNAL:
/* We have a global thread for delivering timed signals.
If it is not running, try to start it up. */
thread = &__timer_signal_thread_rclk;
if (! thread->exists)
{
if (__builtin_expect (__timer_thread_start (thread),
1) < 0)
{
__set_errno (EAGAIN);
goto unlock_bail;
}
}
break;
case SIGEV_THREAD:
/* Copy over thread attributes or set up default ones. */
if (evp->sigev_notify_attributes)
newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes;
else
pthread_attr_init (&newtimer->attr);
/* Ensure thread attributes call for deatched thread. */
pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED);
/* Try to find existing thread having the right attributes. */
thread = __timer_thread_find_matching (&newtimer->attr, clock_id);
/* If no existing thread has these attributes, try to allocate one. */
if (thread == NULL)
thread = __timer_thread_alloc (&newtimer->attr, clock_id);
/* Out of luck; no threads are available. */
if (__builtin_expect (thread == NULL, 0))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
/* If the thread is not running already, try to start it. */
if (! thread->exists
&& __builtin_expect (! __timer_thread_start (thread), 0))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
break;
default:
__set_errno (EINVAL);
goto unlock_bail;
}
newtimer->clock = clock_id;
newtimer->abstime = 0;
newtimer->armed = 0;
newtimer->thread = thread;
*timerid = timer_ptr2id (newtimer);
retval = 0;
if (__builtin_expect (retval, 0) == -1)
{
unlock_bail:
if (thread != NULL)
__timer_thread_dealloc (thread);
if (newtimer != NULL)
{
timer_delref (newtimer);
__timer_dealloc (newtimer);
}
}
pthread_mutex_unlock (&__timer_mutex);
return retval;
}
/* 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;
}