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

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This file is part of the GNU C Library.

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

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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

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

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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

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

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

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#ifndef _SYS_SEM_H

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#define _SYS_SEM_H 1

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#include <features.h>

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#define __need_size_t

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#include <stddef.h>

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

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#include <sys/ipc.h>

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

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#include <bits/sem.h>

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#ifdef __USE_GNU

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# include <bits/types/struct_timespec.h>

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#endif

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

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handling. The definition is found in XPG2. */

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

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struct sembuf

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{

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unsigned short int sem_num; /* semaphore number */

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short int sem_op; /* semaphore operation */

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short int sem_flg; /* operation flag */

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};

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__BEGIN_DECLS

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/* Semaphore control operation. */

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

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/* Get semaphore. */

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

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/* Operate on semaphore. */

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

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#ifdef __USE_GNU

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/* Operate on semaphore with timeout. */

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

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const struct timespec *__timeout) __THROW;

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#endif

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__END_DECLS

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#endif /* sys/sem.h */

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