/* Copyright (C) 2002-2018 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 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

# include <bits/types/struct_timespec.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 */