sysdeps/unix/sysv/linux/timer_delete.c

   1 /* Copyright (C) 2003-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   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 <errno.h>
  20 #include <stdlib.h>
  21 #include <time.h>
  22 #include <sysdep.h>
  23 #include "kernel-posix-timers.h"
  24
  25
  26 #ifdef timer_delete_alias
  27 # define timer_delete timer_delete_alias
  28 #endif
  29
  30
  31 int
  32 timer_delete (timer_t timerid)
  33 {
  34 #undef timer_delete
  35   struct timer *kt = (struct timer *) timerid;
  36
  37   /* Delete the kernel timer object.  */
  38   int res = INLINE_SYSCALL (timer_delete, 1, kt->ktimerid);
  39
  40   if (res == 0)
  41     {
  42       if (kt->sigev_notify == SIGEV_THREAD)
  43         {
  44           /* Remove the timer from the list.  */
  45           pthread_mutex_lock (&__active_timer_sigev_thread_lock);
  46           if (__active_timer_sigev_thread == kt)
  47             __active_timer_sigev_thread = kt->next;
  48           else
  49             {
  50               struct timer *prevp = __active_timer_sigev_thread;
  51               while (prevp->next != NULL)
  52                 if (prevp->next == kt)
  53                   {
  54                     prevp->next = kt->next;
  55                     break;
  56                   }
  57                 else
  58                   prevp = prevp->next;
  59             }
  60           pthread_mutex_unlock (&__active_timer_sigev_thread_lock);
  61         }
  62
  63       /* Free the memory.  */
  64       (void) free (kt);
  65
  66       return 0;
  67     }
  68
  69   /* The kernel timer is not known or something else bad happened.
  70      Return the error.  */
  71   return -1;
  72 }