1  /* Semaphore type.  Generic version.
       2     Copyright (C) 2005-2023 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  #ifndef _BITS_SEMAPHORE_H
      20  #define _BITS_SEMAPHORE_H	1
      21  
      22  #ifndef _SEMAPHORE_H
      23  # error Never include <bits/semaphore.h> directly.
      24  #endif
      25  
      26  #include <bits/types/__pthread_spinlock_t.h>
      27  #include <bits/pthread.h>
      28  
      29  /* User visible part of a semaphore.  */
      30  
      31  #define __SIZEOF_SEM_T	20
      32  
      33  typedef union
      34  {
      35    char __size[__SIZEOF_SEM_T];
      36    long int __align;
      37  } sem_t;
      38  
      39  #define SEM_FAILED ((void *) 0)
      40  
      41  #endif /* bits/semaphore.h */