systemswstubs/examplecommonisc/IscDriver/src/IscSendQueue.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 14 Jan 2010 07:14:53 +0200
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permissions -rw-r--r--
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/*
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* Copyright (c) 2005 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:  An example implementation for ISC Driver Reference
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*
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*/
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// INCLUDE FILES
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#include <kernel.h>
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#include "IscSendQueue.h"
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#include "IscTrace.h"
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// EXTERNAL DATA STRUCTURES
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// EXTERNAL FUNCTION PROTOTYPES  
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// CONSTANTS
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const TInt KImpossibleChannelId( 255 );
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// MACROS
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// LOCAL CONSTANTS AND MACROS
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// MODULE DATA STRUCTURES
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// LOCAL FUNCTION PROTOTYPES
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// FORWARD DECLARATIONS
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// ============================ MEMBER FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// DIscSendQueue::DIscSendQueue
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// C++ default constructor can NOT contain any code, that
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// might leave.
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// -----------------------------------------------------------------------------
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//
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EXPORT_C DIscSendQueue::DIscSendQueue( TUint32** aQueue, TIscSendFrameInfo** aParameterQueue, TUint16 aSize )
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         :iParameterQueue( aParameterQueue )
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    {
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    iHead  = 0;
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    iTail  = 0;
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    iCount = 0;
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    iQueue = aQueue;
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    iSize  = aSize;
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    for ( TInt i( 0 ); i < aSize; i++ )
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        {
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        iParameterQueue[i]->iChannelId = KImpossibleChannelId;
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        iParameterQueue[i]->iChannelPtr = NULL;
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        iParameterQueue[i]->iFrameInfo = NULL;
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        }
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    E_TRACE( ( _T( "ISQ:ISQ %d 0x%x" ), iSize, iQueue ) );
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    }
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// Destructor
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EXPORT_C DIscSendQueue::~DIscSendQueue()
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    {
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    iHead       = 0;
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    iTail       = 0;
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    iCount      = 0;
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    iQueue      = NULL;
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    iParameterQueue = NULL;
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    iSize       = 0;
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    }
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// -----------------------------------------------------------------------------
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// DIscSendQueue::Add
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// Function to add element to queue
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// ( other items were commented in a header ).
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// -----------------------------------------------------------------------------
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//
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EXPORT_C TInt DIscSendQueue::Add( TAny* anEntry, TUint16 aId, DIscChannel* aChannelPtr, TAny* aFrameInfo )
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    {
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    E_TRACE( ( _T( "ISQ:A %d, 0x%x" ), iCount, iQueue ) );
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    TInt irqLevel = DisableIrqs();
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    if ( iCount == iSize || iSize == 0 )
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        {
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        RestoreIrqs( irqLevel );
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        return KErrNoMemory;//EFalse;
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        }
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    /* place the buffer into the queue */
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    iQueue[ iTail ] = ( TUint32* )( anEntry );
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    TIscSendFrameInfo* tmp = iParameterQueue[ iTail ];
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    // Set additional info for send frame
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    tmp->iChannelId = aId;
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    tmp->iChannelPtr = aChannelPtr;
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    tmp->iFrameInfo = aFrameInfo;
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    /* adjust tail pointer */
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    iTail = ++iTail % iSize;
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    /* remember the amount of the requests in the queue */
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    iCount++;
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    RestoreIrqs( irqLevel );
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    return KErrNone;
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    }
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// -----------------------------------------------------------------------------
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// DIscSendQueue::GetFirstFrameInfo
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// Returns a frist frame info from list.
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// (other items were commented in a header).
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// -----------------------------------------------------------------------------
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//
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EXPORT_C TIscSendFrameInfo* DIscSendQueue::GetFirstFrameInfo()
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    {
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    E_TRACE( ( _T( "ISQ:G(%d, 0x%x)" ), iCount, iQueue ) );
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    TIscSendFrameInfo* result;
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    TInt irqLevel = DisableIrqs();
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    if ( iCount == 0 || iSize == 0 )
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        {
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        RestoreIrqs( irqLevel );
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        return NULL;
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        }
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    result = iParameterQueue[ iHead ];
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    RestoreIrqs( irqLevel );
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    return result;
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    }
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