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/*
* Copyright (c) 2019, The Linux Foundation. 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.
* * Neither the name of The Linux Foundation 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 "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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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