author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:03:13 +0200 | |
changeset 0 | c40eb8fe8501 |
child 11 | a9473894c0f1 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007-2009 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 "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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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: WlanHeap declaration |
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* |
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*/ |
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/* |
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* %version: 3 % |
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*/ |
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#ifndef WLAN_OSA_HEAP_H |
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#define WLAN_OSA_HEAP_H |
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class RWlanHeap |
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{ |
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public: |
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struct SCell { |
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/** |
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The length of the cell, which includes the length of |
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this header. |
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*/ |
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TInt len; |
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/** |
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A pointer to the next cell in the free list. |
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*/ |
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SCell* next; |
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}; |
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enum {EAllocCellSize = sizeof(TInt)}; |
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/** |
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Size of a free cell header. |
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*/ |
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enum {EFreeCellSize = sizeof(SCell)}; |
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/** |
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@internalComponent |
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*/ |
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struct _s_align {char c; double d;}; |
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/** |
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The default cell alignment. |
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*/ |
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enum {ECellAlignment = sizeof(_s_align)-sizeof(double)}; |
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public: |
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static RWlanHeap* FixedHeap( |
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TAny* aBase, |
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TInt aMaxLength, |
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TInt aAllocationUnit ); |
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public: |
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/** |
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Allocates a cell of the specified size from the heap. |
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If there is insufficient memory available on the heap from which to allocate |
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a cell of the required size, the function returns NULL. |
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The cell is aligned according to the alignment value specified at construction, |
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or the default alignment value, if an explict value was not specified. |
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The resulting size of the allocated cell may be rounded up to a |
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value greater than aSize, but is guaranteed to be not less than aSize. |
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@param aSize The |
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size of the cell to be allocated from the heap |
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@return A pointer to the allocated cell. NULL if there is insufficient memory |
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available. |
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@see KMaxTInt |
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*/ |
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TAny* Alloc(TInt aSize); |
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/** |
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Frees the specified cell and returns it to the heap. |
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@param aCell A pointer to a valid cell; this pointer can also be NULL, |
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in which case the function does nothing and just returns. |
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*/ |
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void Free(TAny* aPtr); |
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/** |
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Gets the total free space currently available on the heap and the space |
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available in the largest free block. |
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The space available represents the total space which can be allocated. |
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Note that compressing the heap may reduce the total free space available and |
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the space available in the largest free block. |
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@param aBiggestBlock On return, contains the space available |
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in the largest free block on the heap. |
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@return The total free space currently available on the heap. |
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*/ |
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TInt Available(TInt& aBiggestBlock) const; |
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private: |
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RWlanHeap(TInt aInitialSize, TInt aAllocationUnit ); |
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TAny* RWlanHeap::operator new(TUint aSize, TAny* aBase); |
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void Initialise(); |
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/** |
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As much as possible, check a cell address and backspace it |
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to point at the cell header. |
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*/ |
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RWlanHeap::SCell* GetAddress(const TAny* aCell) const; |
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/** |
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Gets the length of the available space in the specified allocated cell. |
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@param aCell A pointer to the allocated cell. |
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@return The length of the available space in the allocated cell. |
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*/ |
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TInt AllocLen(const TAny* aCell) const; |
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/** |
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Allocate without growing. aSize includes cell header and alignment. |
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*/ |
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RWlanHeap::SCell* DoAlloc(TInt aSize, SCell*& aLastFree); |
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void DoFree(SCell* pC); |
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/** |
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Find the free cell that immediately follows aCell, if one exists |
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If found, aNext is set to point to it, else it is set to NULL. |
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aPrev is set to the free cell before aCell or the dummy free cell where there are no free cells before aCell. |
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Called with lock enabled. |
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*/ |
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void FindFollowingFreeCell(SCell* aCell, SCell*& aPrev, SCell*& aNext); |
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/** |
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Try to grow the heap cell 'aCell' in place, to size 'aSize'. |
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Requires the free cell immediately after aCell (aNext), and the free cell prior to |
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that (aPrev), to be provided. (As found by FindFollowingFreeCell) |
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*/ |
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TInt TryToGrowCell(SCell* aCell,SCell* aPrev, SCell* aNext, TInt aSize); |
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private: |
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TInt iMinLength; |
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TInt iMaxLength; |
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TInt iOffset; |
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TInt iGrowBy; |
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TInt iChunkHandle; |
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TUint8* iBase; |
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TUint8* iTop; |
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TInt iAlign; |
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TInt iMinCell; |
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TInt iPageSize; |
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SCell iFree; |
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}; |
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#endif |