kernel/eka/compsupp/symaehabi/emergency_buffer.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 17 Sep 2010 08:37:04 +0300
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// Copyright (c) 2009-2010 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "ARM EABI LICENCE.txt"
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// which accompanies this distribution, and is available
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// in kernel/eka/compsupp.
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// 
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//
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template<typename T, unsigned N> class TEmergencyBuffer
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	{
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public:
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	void Init();
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public:
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	void* Alloc(unsigned);
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	void* Free(void*);
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private:
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	bool iIsOccupied[N];
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	T iSlots[N];
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private:
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	TEmergencyBuffer();
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	};
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template<typename T, unsigned N> inline void TEmergencyBuffer<T,N>::Init()
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	{
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	for (int i=0; i < N; i++)
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		{
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		iIsOccupied[i] = 0;
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		}
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	}
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template<typename T, unsigned N> void* TEmergencyBuffer<T,N>::Alloc(unsigned n)
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	{
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	if ( n <= sizeof(T) )
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		{
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		for (int i=0; i < N; i++)
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			{
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			bool& isOccupied = iIsOccupied[i];
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			if ( ! isOccupied )
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				{
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				isOccupied = 1;
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				return &iSlots[i];
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				}
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			}
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		}
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	return NULL;
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	}
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template<typename T, unsigned N> void* TEmergencyBuffer<T,N>::Free(void* p)
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	{
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	for (int i=0; i < N; i++)
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		{
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		const void* bp = &iSlots[i];
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		bool& isOccupied = iIsOccupied[i];
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		if ( bp == p && isOccupied )
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			{
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			isOccupied = 0;
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			return p;
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			}
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		}
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	return NULL;
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	}
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