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