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/*
* Copyright (c) 2017, The Linux Foundation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
#include "AEEatomic.h"
uint32 atomic_Add(uint32 *volatile puDest, int nAdd)
{
uint32 previous;
uint32 current;
do
{
current = *puDest;
previous = atomic_CompareAndExchange(puDest, current + nAdd, current);
}
while (previous != current);
return (current + nAdd);
}
uint32 atomic_Exchange(uint32 *volatile puDest, uint32 uVal)
{
uint32 previous;
uint32 current;
do
{
current = *puDest;
previous = atomic_CompareAndExchange(puDest, uVal, current);
}
while (previous != current);
return previous;
}
uint32 atomic_CompareOrAdd(uint32 *volatile puDest, uint32 uCompare, int nAdd)
{
uint32 previous;
uint32 current;
uint32 result;
do
{
current = *puDest;
previous = current;
result = current;
if (current != uCompare)
{
previous = atomic_CompareAndExchange(puDest, current + nAdd, current);
if (previous == current)
{
result = current + nAdd;
}
}
}
while (previous != current);
return result;
}
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