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/*! \file include/atomic.h
\brief Interface: critical section management
\author Henner Zeller <H.Zeller@acm.org>
Defines types and functions to implement atomic counters.
*/
/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License
* at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and
* limitations under the License.
*
* The Original Code is legOS code, released October 17, 1999.
*
* The Initial Developer of the Original Code is Markus L. Noga.
* Portions created by Markus L. Noga are Copyright (C) 1999
* Markus L. Noga. All Rights Reserved.
*
* Contributor(s): Joseph A. Woolley <jawoolley@users.sourceforge.net
* Henner Zeller <H.Zeller@acm.org>
*/
#ifndef __atomic_h__
#define __atomic_h__
#include <config.h>
#ifdef CONF_ATOMIC
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* The data type that allows for atomic count operations.
* @see atomic_inc
*/
typedef volatile unsigned char atomic_t;
/**
* decrement atomic counter without interruption.
* locks interrupts except NMI, decrements count
* then restores interrupts.
* @param counter the counter resource to be decremented
* @see atomic_inc
*/
extern void atomic_dec(atomic_t* counter);
/**
* increment atomic counter without interruption.
* locks interrupts except NMI, increments count
* then restores interrupts.
* @param counter the counter resource to be incremented
* @see atomic_dec
*/
extern void atomic_inc(atomic_t* counter);
#if defined(__cplusplus)
}
#endif /* __cplusplus */
#endif /* CONF_ATOMIC */
#endif /* __critsec_h__ */
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