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100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
/*==LICENSE==*
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CyanWorlds.com Engine - MMOG client, server and tools
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Copyright (C) 2011 Cyan Worlds, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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You can contact Cyan Worlds, Inc. by email legal@cyan.com
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or by snail mail at:
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Cyan Worlds, Inc.
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14617 N Newport Hwy
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Mead, WA 99021
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*==LICENSE==*/
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#ifndef CoreLib_Thread
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#define CoreLib_Thread
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#include "hsThread.h"
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#include "hsUtils.h"
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//////////////////////////////////////////////////////////////////////////////
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hsReaderWriterLock::hsReaderWriterLock( const char * name, Callback * cb )
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: fReaderCount( 0 )
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, fWriterSema( 1 )
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, fCallback( cb )
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, fName( nil )
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{
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fName = hsStrcpy( name );
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}
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hsReaderWriterLock::~hsReaderWriterLock()
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{
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delete [] fName;
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}
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void hsReaderWriterLock::LockForReading()
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{
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if ( fCallback )
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fCallback->OnLockingForRead( this );
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fReaderCountLock.Lock();
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fReaderLock.Lock();
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fReaderCount++;
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if ( fReaderCount==1 )
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fWriterSema.Wait();
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fReaderLock.Unlock();
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fReaderCountLock.Unlock();
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if ( fCallback )
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fCallback->OnLockedForRead( this );
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}
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void hsReaderWriterLock::UnlockForReading()
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{
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if ( fCallback )
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fCallback->OnUnlockingForRead( this );
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fReaderLock.Lock();
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fReaderCount--;
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if ( fReaderCount==0 )
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fWriterSema.Signal();
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fReaderLock.Unlock();
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if ( fCallback )
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fCallback->OnUnlockedForRead( this );
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}
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void hsReaderWriterLock::LockForWriting()
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{
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if ( fCallback )
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fCallback->OnLockingForWrite( this );
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fReaderCountLock.Lock();
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fWriterSema.Wait();
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hsAssert( fReaderCount==0, "Locked for writing, but fReaderCount>0" );
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if ( fCallback )
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fCallback->OnLockedForWrite( this );
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}
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void hsReaderWriterLock::UnlockForWriting()
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{
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if ( fCallback )
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fCallback->OnUnlockingForWrite( this );
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fWriterSema.Signal();
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fReaderCountLock.Unlock();
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if ( fCallback )
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fCallback->OnUnlockedForWrite( this );
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}
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#endif // CoreLib_Thread
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