sysdeps/arm/nptl/bits/semaphore.h

   1 /* Copyright (C) 2002-2018 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
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _SEMAPHORE_H
  19 # error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
  20 #endif
  21
  22
  23 #define __SIZEOF_SEM_T  16
  24
  25
  26 /* Value returned if `sem_open' failed.  */
  27 #define SEM_FAILED      ((sem_t *) 0)
  28
  29
  30 typedef union
  31 {
  32   char __size[__SIZEOF_SEM_T];
  33   long int __align;
  34 } sem_t;