/* Copyright (C) 1995-1999, 2000, 2003 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */

#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
# define __need_timespec
# include <time.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 */