/*

* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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:  An example implementation for ISC Driver Reference

*

*/

// INCLUDE FILES

#include <kernel.h>

#include "IscSendQueue.h"

#include "IscTrace.h"

// EXTERNAL DATA STRUCTURES

// EXTERNAL FUNCTION PROTOTYPES  

// CONSTANTS

const TInt KImpossibleChannelId( 255 );

// MACROS

// LOCAL CONSTANTS AND MACROS

// MODULE DATA STRUCTURES

// LOCAL FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// DIscSendQueue::DIscSendQueue

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

//

EXPORT_C DIscSendQueue::DIscSendQueue( TUint32** aQueue, TIscSendFrameInfo** aParameterQueue, TUint16 aSize )

         :iParameterQueue( aParameterQueue )

    {

    iHead  = 0;

    iTail  = 0;

    iCount = 0;

    iQueue = aQueue;

    iSize  = aSize;

    for ( TInt i( 0 ); i < aSize; i++ )

        {

        iParameterQueue[i]->iChannelId = KImpossibleChannelId;

        iParameterQueue[i]->iChannelPtr = NULL;

        iParameterQueue[i]->iFrameInfo = NULL;

        }

    E_TRACE( ( _T( "ISQ:ISQ %d 0x%x" ), iSize, iQueue ) );

    }

// Destructor

EXPORT_C DIscSendQueue::~DIscSendQueue()

    {

    iHead       = 0;

    iTail       = 0;

    iCount      = 0;

    iQueue      = NULL;

    iParameterQueue = NULL;

    iSize       = 0;

    }

// -----------------------------------------------------------------------------

// DIscSendQueue::Add

// Function to add element to queue

// ( other items were commented in a header ).

// -----------------------------------------------------------------------------

//

EXPORT_C TInt DIscSendQueue::Add( TAny* anEntry, TUint16 aId, DIscChannel* aChannelPtr, TAny* aFrameInfo )

    {

    E_TRACE( ( _T( "ISQ:A %d, 0x%x" ), iCount, iQueue ) );

    TInt irqLevel = DisableIrqs();

    if ( iCount == iSize || iSize == 0 )

        {

        RestoreIrqs( irqLevel );

        return KErrNoMemory;//EFalse;

        }

    /* place the buffer into the queue */

    iQueue[ iTail ] = ( TUint32* )( anEntry );

    TIscSendFrameInfo* tmp = iParameterQueue[ iTail ];

    // Set additional info for send frame

    tmp->iChannelId = aId;

    tmp->iChannelPtr = aChannelPtr;

    tmp->iFrameInfo = aFrameInfo;

    /* adjust tail pointer */

    iTail = ++iTail % iSize;

    /* remember the amount of the requests in the queue */

    iCount++;

    RestoreIrqs( irqLevel );

    return KErrNone;

    }

// -----------------------------------------------------------------------------

// DIscSendQueue::GetFirstFrameInfo

// Returns a frist frame info from list.

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

EXPORT_C TIscSendFrameInfo* DIscSendQueue::GetFirstFrameInfo()

    {

    E_TRACE( ( _T( "ISQ:G(%d, 0x%x)" ), iCount, iQueue ) );

    TIscSendFrameInfo* result;

    TInt irqLevel = DisableIrqs();

    if ( iCount == 0 || iSize == 0 )

        {

        RestoreIrqs( irqLevel );

        return NULL;

        }

    result = iParameterQueue[ iHead ];

    RestoreIrqs( irqLevel );

    return result;

    }