sysdeps/htl/sem-destroy.c

   1 /* Destroy a semaphore.  Generic version.
   2    Copyright (C) 2005-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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;  if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <semaphore.h>
  20 #include <errno.h>
  21
  22 #include <pt-internal.h>
  23
  24 int
  25 __sem_destroy (sem_t *sem)
  26 {
  27   struct new_sem *isem = (struct new_sem *) sem;
  28   if (
  29 #if __HAVE_64B_ATOMICS
  30       atomic_load_relaxed (&isem->data) >> SEM_NWAITERS_SHIFT
  31 #else
  32       atomic_load_relaxed (&isem->value) & SEM_NWAITERS_MASK
  33       || isem->nwaiters
  34 #endif
  35       )
  36     /* There are threads waiting on *SEM.  */
  37     {
  38       errno = EBUSY;
  39       return -1;
  40     }
  41
  42   return 0;
  43 }
  44
  45 strong_alias (__sem_destroy, sem_destroy);