author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:34:56 +0100 | |
branch | RCL_3 |
changeset 44 | 3e88ff8f41d5 |
parent 43 | c1f20ce4abcf |
permissions | -rw-r--r-- |
0 | 1 |
// Copyright (c) 2008-2009 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: |
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// f32\sfile\sf_memory_man.h |
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// |
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// |
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/** |
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@file |
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@internalTechnology |
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*/ |
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#if !defined(__SF_MEMORY_MAN_H__) |
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#define __SF_MEMORY_MAN_H__ |
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#include <e32def.h> |
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const TUint KSegmentSizeLog2 = 12; |
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/** Kernel's memory page size in bytes */ |
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const TUint KSegmentSize = 1 << KSegmentSizeLog2; |
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/** Forward declaration */ |
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class CCacheMemoryClient; |
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/** Cache memory manager class */ |
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class CCacheMemoryManager : public CBase |
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{ |
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public: |
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static CCacheMemoryManager* NewL(TInt aSizeInBytes); |
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IMPORT_C CCacheMemoryClient* ConnectClientL(const TDesC& aClientName, TUint32 aMinSizeInSegs, TUint32 aMaxSizeInSegs); |
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IMPORT_C TUint SegmentSizeInBytesLog2() const; |
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TInt RegisterClient(CCacheMemoryClient* aClient); |
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TInt AllocateAndLockSegments(TUint8* aStartRamAddr, TInt aSegmentCount); |
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TInt LockSegments(TUint8* aStartRamAddr, TUint32 aSegmentCount); |
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TInt UnlockSegments(TUint8* aStartRamAddr, TUint32 aSegmentCount); |
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TInt DecommitSegments(TUint8* aStartRamAddr, TUint32 aSegmentCount); |
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TUint8* Base(); |
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void FreeMemoryChanged(TBool aIsMemoryLow); |
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private: |
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~CCacheMemoryManager(); |
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CCacheMemoryManager(TUint32 aMaxSize); |
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void ConstructL(); |
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TInt Lock(TUint8* aStartRamAddr, TInt aSegmentCount); |
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TInt Unlock(TUint8* aStartRamAddr, TInt aSegmentCount); |
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TInt Commit(TUint8* aStartRamAddr, TInt aSegmentCountt); |
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TInt Decommit(TUint8* aStartRamAddr, TInt aSegmentCount); |
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private: |
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RChunk iChunk; ///< the RChunk interface to interact with demand paging sub-system |
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TUint8* iBase; ///< the base ram address of the manager |
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TUint32 iSizeInBytes; ///< virtual ram address size in bytes |
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TUint32 iCurrentOffsetMark; ///< a flag in bytes to record current used virtual address space |
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TInt iLowMemoryThreshold; ///< a threshold in bytes to flag the low memory condition, data type is aligned with TMemoryInfoV1::iTotalRamInBytes |
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TBool isMemoryLow; ///< the flag indicates low memory condition |
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/** an array holds all the registered clients */ |
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RPointerArray<CCacheMemoryClient> iRegisteredClients; |
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friend class CCacheMemoryManagerFactory; |
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}; |
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/** |
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The factory class for CCacheMemoryManager |
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*/ |
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class CCacheMemoryManagerFactory |
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{ |
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public: |
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static void CreateL(); |
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static void Destroy(); |
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IMPORT_C static CCacheMemoryManager* CacheMemoryManager(); |
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private: |
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static CCacheMemoryManager* iCacheMemoryManager; |
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}; |
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/** |
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A static class to read cache memory manager settings |
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*/ |
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NONSHARABLE_CLASS(TGlobalCacheMemorySettings) |
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{ |
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public: |
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static void ReadPropertiesFile(); |
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static TInt CacheSize(); |
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static TInt LowMemoryThreshold(); |
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private: |
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static TInt32 iCacheSizeInBytes; |
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static TInt32 iLowMemoryThreshold; |
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}; |
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538db54a451d
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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diff
changeset
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/** Default cache memory size in KBytes (8192 KBytes)*/ |
538db54a451d
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
0
diff
changeset
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const TInt KDefaultGlobalCacheMemorySize = (8 << 10); |
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/** |
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Low memory threshold as a percentage of total RAM (10 %) |
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If the amount of RAM drops below this value, attempts to allocate memory will fail |
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*/ |
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const TInt KDefaultLowMemoryThreshold = 10; |
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#endif // !defined(__SF_MEMORY_MAN_H__) |