83 lines
1.7 KiB
C++
83 lines
1.7 KiB
C++
/**
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* $LicenseInfo:firstyear=2012&license=fsviewerlgpl$
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* Phoenix Firestorm Viewer Source Code
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* Copyright (C) 2012, Nicky Dasmijn
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* The Phoenix Firestorm Project, Inc., 1831 Oakwood Drive, Fairmont, Minnesota 56031-3225 USA
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* http://www.firestormviewer.org
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* $/LicenseInfo$
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*/
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#ifndef NDLOCKS_H
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#define NDLOCKS_H
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#include "ndintrin.h"
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namespace nd
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{
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namespace locks
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{
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class NoLock
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{
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public:
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void lock(){}
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void unlock() {}
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};
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inline void lock( volatile U32 *aLock )
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{
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while( 0 != nd::intrin::CAS( aLock, 0, 1 ) )
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;
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}
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inline void unlock ( volatile U32 *aLock )
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{
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*aLock = 0;
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}
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inline bool tryLock( volatile U32 *aLock )
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{
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return 0 == nd::intrin::CAS( aLock, 0, 1 );
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}
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class LockHolder
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{
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volatile U32 *mLock;
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public:
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LockHolder( volatile U32 *aLock )
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: mLock( aLock )
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{
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if( mLock )
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lock( mLock );
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}
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~LockHolder()
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{
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if( mLock )
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unlock( mLock );
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}
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void attach( volatile U32 *aLock )
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{
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mLock = aLock;
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}
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};
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}
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}
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#endif
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