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/* Copyright (C) 2002, 2003, 2011, 2012 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 _SEMAPHORE_H
#define _SEMAPHORE_H 1
#include <features.h>
#include <sys/types.h>
#ifdef __USE_XOPEN2K
# define __need_timespec
# include <time.h>
#endif
/* Get the definition for sem_t. */
#include <bits/semaphore.h>
__BEGIN_DECLS
/* Initialize semaphore object SEM to VALUE. If PSHARED then share it
with other processes. */
extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value)
__THROW;
/* Free resources associated with semaphore object SEM. */
extern int sem_destroy (sem_t *__sem) __THROW;
/* Open a named semaphore NAME with open flags OFLAG. */
extern sem_t *sem_open (const char *__name, int __oflag, ...) __THROW;
/* Close descriptor for named semaphore SEM. */
extern int sem_close (sem_t *__sem) __THROW;
/* Remove named semaphore NAME. */
extern int sem_unlink (const char *__name) __THROW;
/* Wait for SEM being posted.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int sem_wait (sem_t *__sem);
#ifdef __USE_XOPEN2K
/* Similar to `sem_wait' but wait only until ABSTIME.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int sem_timedwait (sem_t *__restrict __sem,
const struct timespec *__restrict __abstime);
#endif
/* Test whether SEM is posted. */
extern int sem_trywait (sem_t *__sem) __THROWNL;
/* Post SEM. */
extern int sem_post (sem_t *__sem) __THROWNL;
/* Get current value of SEM and store it in *SVAL. */
extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval)
__THROW;
__END_DECLS
#endif /* semaphore.h */