bluetooth/btstack/l2cap/L2CapSDUQueue.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 19 Aug 2010 11:01:00 +0300
branchRCL_3
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Revision: 201031 Kit: 201033
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// Copyright (c) 2004-2009 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 "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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//
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#ifndef L2CAPSDUQUEUE_H_
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#define L2CAPSDUQUEUE_H_
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#include <bt_sock.h>
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#include "L2CapSDU.h"
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class TL2CapDataControllerConfig;
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class CL2CapBasicDataController;
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class CL2CAPMux;
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class CL2CAPConnectionSAP;
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NONSHARABLE_CLASS(CL2CapSDUQueue) : public CBase,
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                       public ML2CapSDUHandler
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	{
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public:
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	// Can buffer this many outgoing SDUs.
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	const static TUint8 KDefaultOutboundQueueSize = 2;
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	// Can buffer this many incoming SDUs. That's after reassembly, doesn't
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	// include I-Frames that a data controller can buffer on its own.
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	// Note: leaving this at 5 until the problem with legacy data controllers putting
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	// frames on the Q even when they've been told not to is fixed - then should probably
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	// decrease to 2.
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	const static TUint8 KInboundQueueFlowCtrlThreshold = 5;
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	// During normal shutdown initiated by our upper layer we try to deliver
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	// all outstanding data, but kill it brutally if this time is exceeded.
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	const static TUint8 KOutgoingQueueClosingTimer = 60;
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	enum TIncomingSDUQueueCloseAction
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		{
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		EDrainIncomingQueue,
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		EImmediatelyCloseIncomingQueue,
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		};
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	enum TOutgoingSDUQueueCloseAction
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		{
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		EDrainOutgoingQueue,
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		EImmediatelyCloseOutgoingQueue,
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		};
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	static CL2CapSDUQueue* NewLC(CL2CAPConnectionSAP& aL2CapSap,
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	                             TL2CAPPort aLocalCID,
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	                             TL2CAPPort aRemoteCID,
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	                             CL2CAPMux& aMuxer,
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	                             TUint16 aPDUSize,
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  	                             TUint8 aOutboundQueueSize,
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	                             TL2CapDataControllerConfig* aConfig,
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	                             TUint16 aFlushTimeout, 
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	                             TUint16 aMaxOutgoingMTU,
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	                             TUint16 aMaxIncomingMTU,
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	                             TBool aCanDropSdus);
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	static CL2CapSDUQueue* NewL(CL2CAPConnectionSAP& aL2CapSap,
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                                TL2CAPPort aLocalCID,
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                                TL2CAPPort aRemoteCID,
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	                            CL2CAPMux& aMuxer,
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	                            TUint16 aPDUSize,
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	                            TUint8 aOutboundQueueSize,
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	                            TL2CapDataControllerConfig* aConfig,
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	                            TUint16 aFlushTimeout, 
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                                TUint16 aMaxOutgoingMTU,
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                                TUint16 aMaxIncomingMTU,
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                                TBool aCanDropSdus);
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	~CL2CapSDUQueue();
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	static TInt CanSendAsyncCallBack(TAny *aSDUQueue);
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	static TInt SDUsSentAsyncCallBack(TAny *aSDUQueue);
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	static TInt QueueClosingAsyncCallBack(TAny *aSDUQueue);
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	static TInt OutgoingQueueClosingTimerExpired(TAny *aSDUQueue);
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	void ProcessFlushTimerExpiry(CL2CapSDU& aL2CapSDU);
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	HL2CapPDU* GetPDU();
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	inline TBool HavePDUToSend() const;
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	TInt PutIFramePDU(RMBufChain& dataFrame);		
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	void PutBFramePDU(RMBufChain& dataFrame);
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	void FlushCurrentlyAssembledSdu();
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	void FlushOldestIncomingSdu();
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	inline TBool IsIncomingQueueFull() const;
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	TInt Write(RMBufChain& aSDUData);
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	void Read(RMBufChain& readData);
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	void CloseSDUQueue(TIncomingSDUQueueCloseAction aIncomingQueueAction = EImmediatelyCloseIncomingQueue, 
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	                   TOutgoingSDUQueueCloseAction aOutgoingQueueAction = EImmediatelyCloseOutgoingQueue);
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	void DataControllerDeliveredOutgoingData();
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	inline void SuspendSDUQueue();
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	void ResumeSDUQueue(TL2CapDataControllerConfig* aConfig,
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	                    TUint16 aFlushTimeout, 
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	                    TUint16 aPDUSize,
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	                    TUint16 aMaxOutgoingMTU,
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	                    TUint16 aMaxIncomingMTU);
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	void UpdateChannelPriority(TUint8 aNewPriority);
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	void ErrorD(TInt aErrorCode);
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   119
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#ifdef _DEBUG
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	TInt GetDataPlaneConfig(TL2DataPlaneConfig& conf) const;
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	void PretendIncomingSduQFull(TBool aIncomingSduQFull);
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#endif
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	inline TUint16 MaxOutgoingMTU() const;
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	inline TUint16 MaxIncomingMTU() const;
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	inline TUint16 MaximumPDUSize() const;
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	inline TUint16 OptimalPDUSize() const;
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	inline void SetOptimalPDUSize(TUint16 aPDUSize);
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	TBool IsBasicDataVersion() const;
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private:
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	void ConstructL(TL2CAPPort aLocalCID, TL2CAPPort aRemoteCID, CL2CAPMux& aMuxer, TL2CapDataControllerConfig* aConfig);
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	CL2CapSDUQueue(CL2CAPConnectionSAP& aL2CapSap,
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				   TUint8 aOutboundQueueSize,
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	               TUint16 aPDUSize,
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	               TUint16 aFlushTimeout, 
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                   TUint16 aMaxOutgoingMTU,
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                   TUint16 aMaxIncomingMTU,
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                   TBool aCanDropSdus);
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	void SDURemovedFromOutboundQueue();
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	void CanSend();
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	void SDUsSent();
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	TInt HandleIncompleteSDU(RMBufChain& aIncompleteSDU);
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	void TryToCloseQueue();
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	void SDUQueueClosed();
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	void StartOutgoingQueueClosingTimer();
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	void CancelOutgoingQueueClosingTimer();
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	void HandleOutgoingQueueClosingTimerExpired();
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private:		
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	CL2CAPConnectionSAP& iL2CapSap;
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	TUint8 iOutboundQueueSize;
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	CL2CapBasicDataController* iDataController;
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	TDblQue<CL2CapSDU> iOutgoingSDUs;
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	TDblQue<CL2CapSDU> iOutgoingPulledSDUs;
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	RMBufPktQ iIncomingSDUs;
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	RMBufChain iCurrentIncomingSDU;
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	TUint16 iCurrentIncomingSDULength;
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	TUint16 iFlushTimeout;
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	TUint16 iCurrentPDUSize;
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	TUint16 iMaximumPDUSize;
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	TUint16 iNegotiatedPDUSize;
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	TUint8 iCurrentOutboundQueueLength;
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	TUint16 iCurrentInboundQueueLength;
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	TBool iOutboundSendingBlocked;
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	TBool iOutboundQueueSuspended;
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	CAsyncCallBack* iCanSendAsyncCallBack;
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	CAsyncCallBack* iSDUSentAsyncCallBack;
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	CAsyncCallBack* iQueueClosingCallBack;		
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	TBool iSDUQueuesClosing;
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	TBool iIncomingQueueClosed;
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	TBool iOutgoingQueueClosed;
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	TDeltaTimerEntry iOutgoingQueueClosingTimer;
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	TBool iOutgoingQueueClosingTimerRunning;
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	TUint16 iMaxOutgoingMTU;
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	TUint16 iMaxIncomingMTU;
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	TBool	iCanDropSdus;
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	};
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inline TBool CL2CapSDUQueue::IsIncomingQueueFull() const
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	{
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	return iCurrentInboundQueueLength >= KInboundQueueFlowCtrlThreshold;
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	}
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inline TUint16 CL2CapSDUQueue::MaxOutgoingMTU() const
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	{
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	return iMaxOutgoingMTU;
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	}
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inline TUint16 CL2CapSDUQueue::MaxIncomingMTU() const
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	{
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	return iMaxIncomingMTU;
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	}
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inline TUint16 CL2CapSDUQueue::MaximumPDUSize() const
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	{
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	return iMaximumPDUSize;
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	}
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inline TUint16 CL2CapSDUQueue::OptimalPDUSize() const
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	{
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	return iCurrentPDUSize;
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	}
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inline void CL2CapSDUQueue::SetOptimalPDUSize(TUint16 aPDUSize)
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	{
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	iCurrentPDUSize = aPDUSize;
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	}
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inline void CL2CapSDUQueue::SuspendSDUQueue()
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	{
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	iOutboundQueueSuspended = ETrue;
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	}
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inline TBool CL2CapSDUQueue::HavePDUToSend() const
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	{
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	TBool havePDU = EFalse;
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	if(!iOutgoingSDUs.IsEmpty())
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		{
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		CL2CapSDU* sdu = iOutgoingSDUs.First();
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		// If the outbound queue is suspended, and this is the start
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		// of a new SDU.  Then don't send a PDU.
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		if(!(iOutboundQueueSuspended && sdu->CurrentPDUIsFirstPDU()))
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			{
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			if (!sdu->IsSDUEmpty())
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				{
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				havePDU = ETrue;
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				}
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			}
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		}
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	return havePDU;
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	}
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#endif