nptl/sysdeps/pthread/timer_delete.c

   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 not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <pthread.h>
  23 #include <time.h>
  24
  25 #include "posix-timer.h"
  26
  27
  28 /* Delete timer TIMERID.  */
  29 int
  30 timer_delete (timerid)
  31      timer_t timerid;
  32 {
  33   struct timer_node *timer;
  34   int retval = -1;
  35
  36   pthread_mutex_lock (&__timer_mutex);
  37
  38   timer = timer_id2ptr (timerid);
  39   if (! timer_valid (timer))
  40     /* Invalid timer ID or the timer is not in use.  */
  41     __set_errno (EINVAL);
  42   else
  43     {
  44       if (timer->armed && timer->thread != NULL)
  45         {
  46           struct thread_node *thread = timer->thread;
  47           assert (thread != NULL);
  48
  49           /* If thread is cancelled while waiting for handler to terminate,
  50              the mutex is unlocked and timer_delete is aborted.  */
  51           pthread_cleanup_push (__timer_mutex_cancel_handler, &__timer_mutex);
  52
  53           /* If timer is currently being serviced, wait for it to finish.  */
  54           while (thread->current_timer == timer)
  55             pthread_cond_wait (&thread->cond, &__timer_mutex);
  56
  57           pthread_cleanup_pop (0);
  58         }
  59
  60       /* Remove timer from whatever queue it may be on and deallocate it.  */
  61       timer->inuse = TIMER_DELETED;
  62       list_unlink_ip (&timer->links);
  63       timer_delref (timer);
  64       retval = 0;
  65     }
  66
  67   pthread_mutex_unlock (&__timer_mutex);
  68
  69   return retval;
  70 }