nptl/sysdeps/unix/sysv/linux/timer_delete.c

   1 /* Copyright (C) 2003, 2007 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 not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <stdlib.h>
  22 #include <time.h>
  23 #include <sysdep.h>
  24 #include <kernel-features.h>
  25 #include "kernel-posix-timers.h"
  26
  27
  28 #ifdef __NR_timer_delete
  29 # ifndef __ASSUME_POSIX_TIMERS
  30 static int compat_timer_delete (timer_t timerid);
  31 #  define timer_delete static compat_timer_delete
  32 #  include <nptl/sysdeps/pthread/timer_delete.c>
  33 #  undef timer_delete
  34 # endif
  35
  36 # ifdef timer_delete_alias
  37 #  define timer_delete timer_delete_alias
  38 # endif
  39
  40
  41 int
  42 timer_delete (timerid)
  43      timer_t timerid;
  44 {
  45 # undef timer_delete
  46 # ifndef __ASSUME_POSIX_TIMERS
  47   if (__no_posix_timers >= 0)
  48 # endif
  49     {
  50       struct timer *kt = (struct timer *) timerid;
  51
  52       /* Delete the kernel timer object.  */
  53       int res = INLINE_SYSCALL (timer_delete, 1, kt->ktimerid);
  54
  55       if (res == 0)
  56         {
  57           if (kt->sigev_notify == SIGEV_THREAD)
  58             {
  59               /* Remove the timer from the list.  */
  60               pthread_mutex_lock (&__active_timer_sigev_thread_lock);
  61               if (__active_timer_sigev_thread == kt)
  62                 __active_timer_sigev_thread = kt->next;
  63               else
  64                 {
  65                   struct timer *prevp = __active_timer_sigev_thread;
  66                   while (prevp->next != NULL)
  67                     if (prevp->next == kt)
  68                       {
  69                         prevp->next = kt->next;
  70                         break;
  71                       }
  72                     else
  73                       prevp = prevp->next;
  74                 }
  75               pthread_mutex_unlock (&__active_timer_sigev_thread_lock);
  76             }
  77
  78 # ifndef __ASSUME_POSIX_TIMERS
  79           /* We know the syscall support is available.  */
  80           __no_posix_timers = 1;
  81 # endif
  82
  83           /* Free the memory.  */
  84           (void) free (kt);
  85
  86           return 0;
  87         }
  88
  89       /* The kernel timer is not known or something else bad happened.
  90          Return the error.  */
  91 # ifndef __ASSUME_POSIX_TIMERS
  92       if (errno != ENOSYS)
  93         {
  94           __no_posix_timers = 1;
  95 # endif
  96           return -1;
  97 # ifndef __ASSUME_POSIX_TIMERS
  98         }
  99
 100       __no_posix_timers = -1;
 101 # endif
 102     }
 103
 104 # ifndef __ASSUME_POSIX_TIMERS
 105   return compat_timer_delete (timerid);
 106 # endif
 107 }
 108 #else
 109 # ifdef timer_delete_alias
 110 #  define timer_delete timer_delete_alias
 111 # endif
 112 /* The new system calls are not available.  Use the userlevel
 113    implementation.  */
 114 # include <nptl/sysdeps/pthread/timer_delete.c>
 115 #endif