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/* Posix semaphores. Hurd version.
Copyright (C) 2005-2018 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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
# include <bits/types/struct_timespec.h>
#endif
/* Get the definition for sem_t. */
#include <bits/semaphore.h>
__BEGIN_DECLS
/* Initialize semaphore *SEM with value VALUE. */
extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value)
__THROW;
/* Destroy semaphore *SEM created with sem_init. */
extern int sem_destroy (sem_t *__sem) __THROW;
/* Open a named semaphore. */
extern sem_t *sem_open (const char *__name, int __oflag, ...) __THROW;
/* Close a semaphore returned by sem_open. */
extern int sem_close (sem_t *__sem) __THROW;
/* Unlink a named semaphore. */
extern int sem_unlink (const char *__name) __THROW;
/* Perform a down operation on semaphore *SEM.
This function is a cancellation point and therefore not marked with
__THROW. */
extern int sem_wait (sem_t *__sem);
#ifdef __USE_XOPEN2K
/* Perform a down operation on semaphore *SEM but don't wait longer
than TIMEOUT. */
extern int sem_timedwait (sem_t *__restrict __sem,
const struct timespec *__restrict __abstime);
#endif
/* Perform a down operation on semaphore *SEM if it can be done so
without blocking. */
extern int sem_trywait (sem_t *__sem) __THROWNL;
/* Perform an up operation on semaphore *SEM. */
extern int sem_post (sem_t *__sem) __THROWNL;
/* Store the value of semaphore *SEM in *VALUE. */
extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval)
__THROW;
__END_DECLS
#endif /* semaphore.h */
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