// Copyright (c) 2009-2010 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "ARM EABI LICENCE.txt"

// which accompanies this distribution, and is available

// in kernel/eka/compsupp.

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// 

//

template<typename T, unsigned N> class TEmergencyBuffer

	{

public:

	void Init();

public:

	void* Alloc(unsigned);

	void* Free(void*);

private:

	bool iIsOccupied[N];

	T iSlots[N];

private:

	TEmergencyBuffer();

	};

template<typename T, unsigned N> inline void TEmergencyBuffer<T,N>::Init()

	{

	for (int i=0; i < N; i++)

		{

		iIsOccupied[i] = 0;

		}

	}

template<typename T, unsigned N> void* TEmergencyBuffer<T,N>::Alloc(unsigned n)

	{

	if ( n <= sizeof(T) )

		{

		for (int i=0; i < N; i++)

			{

			bool& isOccupied = iIsOccupied[i];

			if ( ! isOccupied )

				{

				isOccupied = 1;

				return &iSlots[i];

				}

			}

		}

	return NULL;

	}

template<typename T, unsigned N> void* TEmergencyBuffer<T,N>::Free(void* p)

	{

	for (int i=0; i < N; i++)

		{

		const void* bp = &iSlots[i];

		bool& isOccupied = iIsOccupied[i];

		if ( bp == p && isOccupied )

			{

			isOccupied = 0;

			return p;

			}

		}

	return NULL;

	}