/* Copyright (C) 1995-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _SYS_SEM_H

#define _SYS_SEM_H	1

#include <features.h>

#define __need_size_t

#include <stddef.h>

/* Get common definition of System V style IPC.  */

#include <sys/ipc.h>

/* Get system dependent definition of `struct semid_ds' and more.  */

#include <bits/sem.h>

#ifdef __USE_GNU

# include <bits/types/struct_timespec.h>

#endif

/* The following System V style IPC functions implement a semaphore

   handling.  The definition is found in XPG2.  */

/* Structure used for argument to `semop' to describe operations.  */

struct sembuf

{

  unsigned short int sem_num;	/* semaphore number */

  short int sem_op;		/* semaphore operation */

  short int sem_flg;		/* operation flag */

};

__BEGIN_DECLS

/* Semaphore control operation.  */

extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW;

/* Get semaphore.  */

extern int semget (key_t __key, int __nsems, int __semflg) __THROW;

/* Operate on semaphore.  */

extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW;

#ifdef __USE_GNU

/* Operate on semaphore with timeout.  */

extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops,

		       const struct timespec *__timeout) __THROW;

#endif

__END_DECLS

#endif /* sys/sem.h */