1  /* Copyright (C) 2000-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; see the file COPYING.LIB.  If
      16     not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <assert.h>
      19  #include <errno.h>
      20  #include <pthread.h>
      21  #include <time.h>
      22  
      23  #include "posix-timer.h"
      24  
      25  
      26  /* Delete timer TIMERID.  */
      27  int
      28  timer_delete (timer_t timerid)
      29  {
      30    struct timer_node *timer;
      31    int retval = -1;
      32  
      33    pthread_mutex_lock (&__timer_mutex);
      34  
      35    timer = timer_id2ptr (timerid);
      36    if (! timer_valid (timer))
      37      /* Invalid timer ID or the timer is not in use.  */
      38      __set_errno (EINVAL);
      39    else
      40      {
      41        if (timer->armed && timer->thread != NULL)
      42  	{
      43  	  struct thread_node *thread = timer->thread;
      44  	  assert (thread != NULL);
      45  
      46  	  /* If thread is cancelled while waiting for handler to terminate,
      47  	     the mutex is unlocked and timer_delete is aborted.  */
      48  	  pthread_cleanup_push (__timer_mutex_cancel_handler, &__timer_mutex);
      49  
      50  	  /* If timer is currently being serviced, wait for it to finish.  */
      51  	  while (thread->current_timer == timer)
      52  	    pthread_cond_wait (&thread->cond, &__timer_mutex);
      53  
      54  	  pthread_cleanup_pop (0);
      55          }
      56  
      57        /* Remove timer from whatever queue it may be on and deallocate it.  */
      58        timer->inuse = TIMER_DELETED;
      59        list_unlink_ip (&timer->links);
      60        timer_delref (timer);
      61        retval = 0;
      62      }
      63  
      64    pthread_mutex_unlock (&__timer_mutex);
      65  
      66    return retval;
      67  }