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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* Copyright (C) 1995-2017 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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