/* Copyright (C) 2000-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of the

   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; see the file COPYING.LIB.  If

   not, see <http://www.gnu.org/licenses/>.  */

#include <assert.h>

#include <errno.h>

#include <pthread.h>

#include <time.h>

#include "posix-timer.h"

/* 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;

}