--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/userlibandfileserver/fileserver/sfile/sf_memory_man.h	Thu Dec 17 09:24:54 2009 +0200
@@ -0,0 +1,109 @@
+// Copyright (c) 2008-2009 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 "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// f32\sfile\sf_memory_man.h
+// 
+//
+
+/**
+ @file
+ @internalTechnology
+*/
+
+#if !defined(__SF_MEMORY_MAN_H__)
+#define __SF_MEMORY_MAN_H__
+
+#include <e32def.h>
+
+const TUint KSegmentSizeLog2 = 12;
+/**	Kernel's memory page size in bytes */
+const TUint KSegmentSize = 1 << KSegmentSizeLog2;
+
+/**	Forward declaration */
+class CCacheMemoryClient;
+
+/**	Cache memory manager class */
+class CCacheMemoryManager : public CBase
+	{
+public:
+	static CCacheMemoryManager* NewL(TInt aSizeInBytes);
+	IMPORT_C CCacheMemoryClient* ConnectClientL(const TDesC& aClientName, TUint32 aMinSizeInSegs, TUint32 aMaxSizeInSegs);
+	IMPORT_C TUint SegmentSizeInBytesLog2() const;
+	TInt	RegisterClient(CCacheMemoryClient* aClient);
+	TInt 	AllocateAndLockSegments(TUint8* aStartRamAddr, TInt aSegmentCount);
+	TInt 	LockSegments(TUint8* aStartRamAddr, TUint32 aSegmentCount);
+	TInt 	UnlockSegments(TUint8* aStartRamAddr, TUint32 aSegmentCount);
+	TInt 	DecommitSegments(TUint8* aStartRamAddr, TUint32 aSegmentCount);
+	TUint8* Base();
+	void 	FreeMemoryChanged(TBool aIsMemoryLow);
+
+private:
+	~CCacheMemoryManager();
+	CCacheMemoryManager(TUint32 aMaxSize);
+	void 	ConstructL();
+	TInt 	Lock(TUint8* aStartRamAddr, TInt aSegmentCount);
+	TInt 	Unlock(TUint8* aStartRamAddr, TInt aSegmentCount);
+	TInt	Commit(TUint8* aStartRamAddr, TInt aSegmentCountt);
+	TInt 	Decommit(TUint8* aStartRamAddr, TInt aSegmentCount);
+
+private:
+	RChunk 	iChunk;					///< the RChunk interface to interact with demand paging sub-system
+	TUint8* iBase;					///< the base ram address of the manager
+	TUint32 iSizeInBytes;			///< virtual ram address size in bytes
+	TUint32 iCurrentOffsetMark;		///< a flag in bytes to record current used virtual address space 
+	TInt	iLowMemoryThreshold;	///< a threshold in bytes to flag the low memory condition, data type is aligned with TMemoryInfoV1::iTotalRamInBytes
+	TBool	isMemoryLow;			///< the flag indicates low memory condition
+
+	/**	an array holds all the registered clients */
+	RPointerArray<CCacheMemoryClient> iRegisteredClients;
+
+	friend class CCacheMemoryManagerFactory;
+	};
+
+/**
+The factory class for CCacheMemoryManager
+*/
+class CCacheMemoryManagerFactory
+	{
+public:
+	static void CreateL();
+	static void Destroy();
+	IMPORT_C static CCacheMemoryManager* CacheMemoryManager();
+private:
+	static CCacheMemoryManager* iCacheMemoryManager;
+	};
+
+/**
+A static class to read cache memory manager settings
+*/
+NONSHARABLE_CLASS(TGlobalCacheMemorySettings)
+	{
+public:
+	static void ReadPropertiesFile();
+
+	static TInt CacheSize();
+	static TInt LowMemoryThreshold();
+private:
+	static TInt32 iCacheSizeInBytes;
+	static TInt32 iLowMemoryThreshold;
+	};
+
+/** Default cache memory size in KBytes (32768 KBytes)*/
+const TInt 	KDefaultGlobalCacheMemorySize = (32 << 10);
+/** 
+Low memory threshold as a percentage of total RAM (10 %)
+If the amount of RAM drops below this value, attempts to allocate memory will fail
+*/
+const TInt 	KDefaultLowMemoryThreshold = 10;
+
+#endif	// !defined(__SF_MEMORY_MAN_H__)