/*
* Copyright (c) 2001-2004 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup sync
* @{
*/
/** @file
*/
#ifndef KERN_SEMAPHORE_H_
#define KERN_SEMAPHORE_H_
#include <arch/types.h>
#include <synch/waitq.h>
#include <synch/synch.h>
typedef struct {
waitq_t wq;
} semaphore_t;
#define semaphore_down(s) \
_semaphore_down_timeout((s), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
#define semaphore_trydown(s) \
_semaphore_down_timeout((s), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NON_BLOCKING)
#define semaphore_down_timeout(s, usec) \
_semaphore_down_timeout((s), (usec), SYNCH_FLAGS_NONE)
extern void semaphore_initialize(semaphore_t *s, int val);
extern int _semaphore_down_timeout(semaphore_t *s, uint32_t usec, int flags);
extern void semaphore_up(semaphore_t *s);
#endif
/** @}
*/