1 /* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3    Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public License as
7    published by the Free Software Foundation; either version 2.1 of the
8    License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; see the file COPYING.LIB.  If
17    not, see <http://www.gnu.org/licenses/>.  */
18 
19 #include <assert.h>
20 #include <errno.h>
21 #include <pthread.h>
22 #include <time.h>
23 
24 #include "posix-timer.h"
25 
26 
27 /* Delete timer TIMERID.  */
28 int
timer_delete(timer_t timerid)29 timer_delete (
30      timer_t timerid)
31 {
32   struct timer_node *timer;
33   int retval = -1;
34 
35   pthread_mutex_lock (&__timer_mutex);
36 
37   timer = timer_id2ptr (timerid);
38   if (! timer_valid (timer))
39     /* Invalid timer ID or the timer is not in use.  */
40     __set_errno (EINVAL);
41   else
42     {
43       if (timer->armed && timer->thread != NULL)
44 	{
45 	  struct thread_node *thread = timer->thread;
46 	  assert (thread != NULL);
47 
48 	  /* If thread is cancelled while waiting for handler to terminate,
49 	     the mutex is unlocked and timer_delete is aborted.  */
50 	  pthread_cleanup_push (__timer_mutex_cancel_handler, &__timer_mutex);
51 
52 	  /* If timer is currently being serviced, wait for it to finish.  */
53 	  while (thread->current_timer == timer)
54 	    pthread_cond_wait (&thread->cond, &__timer_mutex);
55 
56 	  pthread_cleanup_pop (0);
57         }
58 
59       /* Remove timer from whatever queue it may be on and deallocate it.  */
60       timer->inuse = TIMER_DELETED;
61       list_unlink_ip (&timer->links);
62       timer_delref (timer);
63       retval = 0;
64     }
65 
66   pthread_mutex_unlock (&__timer_mutex);
67 
68   return retval;
69 }
70