67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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#include "atomic.h"
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#include "OSMutex.h"
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static OSMutex sAtomicMutex;
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unsigned int atomic_add(unsigned int *area, int val)
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{
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OSMutexLocker locker(&sAtomicMutex);
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*area += val;
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return *area;
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}
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unsigned int atomic_sub(unsigned int *area,int val)
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{
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return atomic_add(area,-val);
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}
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unsigned int atomic_or(unsigned int *area, unsigned int val)
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{
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unsigned int oldval;
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OSMutexLocker locker(&sAtomicMutex);
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oldval=*area;
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*area = oldval | val;
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return oldval;
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}
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unsigned int compare_and_store(unsigned int oval, unsigned int nval, unsigned int *area)
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{
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int rv;
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OSMutexLocker locker(&sAtomicMutex);
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if( oval == *area )
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{
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rv=1;
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*area = nval;
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}
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else
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rv=0;
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return rv;
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}
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