datacommsserver/esockserver/ssock/ss_mbufif.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 12 Mar 2010 15:49:41 +0200
branchRCL_3
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Revision: 201008 Kit: 201008
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// Copyright (c) 2002-2009 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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#include <ss_std.h>
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#include <es_mbufif.h>
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#include <comms-infras/ss_flowbinders.h>
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using namespace ESock;
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// the CWaitForMBufs active object class is used to handle an out of mbufs 
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// condition during CServProviderBaseMBuf::Write. If a normal allocation fails 
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// then one of these AOs is created to wait on mbufs becomign available.
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//
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// when they are, this AO calls CanSend on the socket, which results
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// in Write being called, which should now be able to complete successfully.
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// 
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CWaitForMBufs* CWaitForMBufs::NewL(MSessionDataNotify* aSocket)
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	{
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	CWaitForMBufs* self = new(ELeave) CWaitForMBufs(aSocket);
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	CleanupStack::PushL(self);
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	self->ConstructL();
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	CleanupStack::Pop();
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	return self;
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	}
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CWaitForMBufs::CWaitForMBufs(MSessionDataNotify* aSocket) 
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: CActive(0),
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  iSocket(aSocket)
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	{
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	}
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void CWaitForMBufs::ConstructL()
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	{
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	CActiveScheduler::Add(this);
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	}
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CWaitForMBufs::~CWaitForMBufs()  
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	{
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	Cancel();
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	iMBufChain.Free();
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	}
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// from CActive
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void CWaitForMBufs::RunL()     
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	{
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	iMBufChain.Free();
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	if(iSignalCanSend)
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		{
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		iSignalCanSend = EFalse;  //Has to be before because CanSend can re-request
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		iSocket->CanSend();
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		}
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	if(iSignalNewData)
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		{
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		iSignalNewData = EFalse;  //Has to be before because CanSend can re-request
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		iSocket->NewData(0);
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		}
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	}
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void CWaitForMBufs::DoCancel() 
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	{
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		iSignalNewData = EFalse;  
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		iSignalCanSend = EFalse;
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		iRequest.Cancel();
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	}
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// requests
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void CWaitForMBufs::CancelNewData() 
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	{
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	iSignalNewData = EFalse;  
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	if (!iSignalNewData && !iSignalCanSend)
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		{
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		iRequest.Cancel();
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		}
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	}
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void CWaitForMBufs::CancelCanSend() 
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	{
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	iSignalCanSend = EFalse;
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	if (!iSignalNewData && !iSignalCanSend)
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		{
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		iRequest.Cancel();
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		}
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	}
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void CWaitForMBufs::AllocWaitAndSignalNewData(TUint aSize)
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	{
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	if(!IsActive())
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		{
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		iRequest.Alloc(iMBufChain, aSize, iStatus);
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		SetActive();
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		}
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	iSignalNewData = ETrue;
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	}
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void CWaitForMBufs::AllocWaitAndSignalCanSend(TUint aSize)
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	{
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	if(!IsActive())
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		{
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		iRequest.Alloc(iMBufChain, aSize, iStatus);
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		SetActive();
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		}
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	iSignalCanSend = ETrue;
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	}
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   120