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

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

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

     5 // which accompanies this distribution, and is available

     6 // in kernel/eka/compsupp.

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // 

    15 //

    16 

    17 template<typename T, unsigned N> class TEmergencyBuffer

    18 	{

    19 public:

    20 	void Init();

    21 public:

    22 	void* Alloc(unsigned);

    23 	void* Free(void*);

    24 private:

    25 	bool iIsOccupied[N];

    26 	T iSlots[N];

    27 private:

    28 	TEmergencyBuffer();

    29 	};

    30 

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

    32 	{

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

    34 		{

    35 		iIsOccupied[i] = 0;

    36 		}

    37 	}

    38 

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

    40 	{

    41 	if ( n <= sizeof(T) )

    42 		{

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

    44 			{

    45 			bool& isOccupied = iIsOccupied[i];

    46 

    47 			if ( ! isOccupied )

    48 				{

    49 				isOccupied = 1;

    50 				return &iSlots[i];

    51 				}

    52 			}

    53 		}

    54 

    55 	return NULL;

    56 	}

    57 

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

    59 	{

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

    61 		{

    62 		const void* bp = &iSlots[i];

    63 		bool& isOccupied = iIsOccupied[i];

    64 

    65 		if ( bp == p && isOccupied )

    66 			{

    67 			isOccupied = 0;

    68 			return p;

    69 			}

    70 		}

    71 

    72 	return NULL;

    73 	}

    74 

    75