1/* Copyright (C) 1995-2014 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 _SYS_SEM_H
19#define _SYS_SEM_H 1
20
21#include <features.h>
22
23#define __need_size_t
24#include <stddef.h>
25
26/* Get common definition of System V style IPC. */
27#include <sys/ipc.h>
28
29/* Get system dependent definition of `struct semid_ds' and more. */
30#include <bits/sem.h>
31
32#ifdef __USE_GNU
33# define __need_timespec
34# include <time.h>
35#endif
36
37/* The following System V style IPC functions implement a semaphore
38 handling. The definition is found in XPG2. */
39
40/* Structure used for argument to `semop' to describe operations. */
41struct sembuf
42{
43 unsigned short int sem_num; /* semaphore number */
44 short int sem_op; /* semaphore operation */
45 short int sem_flg; /* operation flag */
46};
47
48
49__BEGIN_DECLS
50
51/* Semaphore control operation. */
52extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW;
53
54/* Get semaphore. */
55extern int semget (key_t __key, int __nsems, int __semflg) __THROW;
56
57/* Operate on semaphore. */
58extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW;
59
60#ifdef __USE_GNU
61/* Operate on semaphore with timeout. */
62extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops,
63 const struct timespec *__timeout) __THROW;
64#endif
65
66__END_DECLS
67
68#endif /* sys/sem.h */
69