diff -r e71858845f73 -r e1758cbb96ac systemswstubs/examplecommonisc/IscDriver/src/IscQueue.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/systemswstubs/examplecommonisc/IscDriver/src/IscQueue.cpp	Mon Oct 04 00:04:35 2010 +0300
@@ -0,0 +1,295 @@
+/*
+* 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>
+#ifdef __WINS__
+#include <windows.h>
+#endif
+
+#include <IscDefinitions.h>
+#include "IscQueue.h"
+#include "IscTrace.h"
+
+
+// EXTERNAL DATA STRUCTURES
+#ifdef __WINS__
+extern CRITICAL_SECTION g_IscCriticalSection;
+#endif
+
+// EXTERNAL FUNCTION PROTOTYPES  
+
+// CONSTANTS
+const TInt KIscInterruptLevelTwo( 2 );
+
+// MACROS
+
+// LOCAL CONSTANTS AND MACROS
+
+// MODULE DATA STRUCTURES
+
+// LOCAL FUNCTION PROTOTYPES
+
+// FORWARD DECLARATIONS
+
+
+// ============================ MEMBER FUNCTIONS ===============================
+
+// -----------------------------------------------------------------------------
+// DIscQueue::DIscQueue
+// C++ default constructor 
+// -----------------------------------------------------------------------------
+//
+DIscQueue::DIscQueue()
+    :iHead( 0 ),iTail( 0 ),iCount( 0 ),iSize( 0 ),iQueue( NULL )
+    {
+    }
+
+// -----------------------------------------------------------------------------
+// DIscQueue::DIscQueue
+// C++ default constructor can NOT contain any code, that
+// might leave.
+// -----------------------------------------------------------------------------
+//
+EXPORT_C DIscQueue::DIscQueue( TUint32** aQueue, TUint16 Size )
+        :iHead( 0 ),iTail( 0 ),iCount( 0 ),iSize( Size ),iQueue( aQueue )
+    {
+    E_TRACE( ( _T( "IQ:IQ %d 0x%x" ), iSize, iQueue ) );
+    }
+    
+// Destructor
+EXPORT_C DIscQueue::~DIscQueue()
+    {
+    iHead   = 0;
+    iTail   = 0;
+    iCount  = 0;
+    iQueue  = NULL;
+    iSize   = 0;
+    }
+
+
+// -----------------------------------------------------------------------------
+// DIscQueue::Add
+// Function to add element to queue
+// ( other items were commented in a header ).
+// -----------------------------------------------------------------------------
+//
+EXPORT_C TInt DIscQueue::Add( TAny* anEntry )
+    {
+    E_TRACE( ( _T( "IQ: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 );
+
+    if ( iSize > 0 )
+        {
+        /* adjust tail pointer */
+        iTail = ++iTail % iSize;
+
+        /* remember the amount of the requests in the queue */
+        iCount++;
+        }
+    else
+        {
+        ASSERT_RESET_ALWAYS( 0, "IscDriver", EIscBufferAllocationFailure )
+        }
+
+    RestoreIrqs( irqLevel );
+
+    return KErrNone;
+    }
+
+// -----------------------------------------------------------------------------
+// DIscQueue::Remove
+// Removes first element from the queue
+// ( other items were commented in a header ).
+// -----------------------------------------------------------------------------
+//
+EXPORT_C TAny* DIscQueue::RemoveFirst()
+    {
+    E_TRACE( ( _T( "IQ:R %d %d" ), iCount, iSize ) );
+    
+    TAny* result = NULL;
+    TInt irqLevel = DisableIrqs();
+
+    if ( iCount == 0 || iSize == 0 )
+        {
+        RestoreIrqs( irqLevel );
+        return NULL;
+        }
+    // Get an element from the queue.
+    result = ( TAny* )iQueue[ iHead ];
+
+    iQueue[ iHead ] = NULL;
+
+    // Adjust the head of the queue.
+    iHead = ++iHead % iSize;
+    // Decrease counter.
+    iCount--;
+
+    RestoreIrqs( irqLevel );
+
+    return result;
+
+    }
+
+// -----------------------------------------------------------------------------
+// DIscQueue::GetFirst
+// Fetches first element from the queue
+// ( other items were commented in a header ).
+// -----------------------------------------------------------------------------
+//
+EXPORT_C TAny* DIscQueue::GetFirst()
+    {
+    E_TRACE( ( _T( "IQ:G %d %d" ), iCount, iSize ) );
+    
+    TAny* result;
+    TInt irqLevel = DisableIrqs();
+
+    if ( iCount == 0 || iSize == 0 )
+        {
+        RestoreIrqs( irqLevel );
+        return NULL;
+        }
+    // Get an element from the queue.
+    result = ( TAny* )iQueue[ iHead ];
+    
+    RestoreIrqs( irqLevel );
+    
+    return result;
+
+    }
+
+// -----------------------------------------------------------------------------
+// DIscQueue::DeleteFirst
+// Deletes first element from the queue
+// ( other items were commented in a header ).
+// -----------------------------------------------------------------------------
+//
+EXPORT_C void DIscQueue::DeleteFirst()
+    {
+    E_TRACE( ( _T( "IQ:D %d %d" ), iCount, iSize ) );
+    
+    TInt irqLevel = DisableIrqs();
+
+    iQueue[ iHead ] = NULL;
+
+    if ( iSize > 0 )
+        {
+        // Adjust the head of the queue.
+        iHead = ++iHead % iSize;
+        // decrease counter.
+        iCount--;
+        }
+    else
+        {
+        ASSERT_RESET_ALWAYS( 0, "IscDriver", EIscBufferAllocationFailure )
+        }
+
+    RestoreIrqs( irqLevel );
+
+    }
+
+// -----------------------------------------------------------------------------
+// DIscQueue::Empty
+// Checks if queue is empty
+// ( other items were commented in a header ).
+// -----------------------------------------------------------------------------
+//
+EXPORT_C TBool DIscQueue::Empty()
+    {
+    TInt result;
+    TInt irqLevel = DisableIrqs();
+    result = iCount == 0 ? ETrue : EFalse;
+    RestoreIrqs( irqLevel );
+
+    return result;
+    }
+
+// -----------------------------------------------------------------------------
+// DIscQueue::NextBufferLenth
+// Gets length of next frame in queue
+// ( other items were commented in a header ).
+// -----------------------------------------------------------------------------
+//
+EXPORT_C TUint16 DIscQueue::NextBufferLength()
+    {
+    TUint16 length;
+
+    TInt irqLevel = DisableIrqs();
+
+    if ( iCount == 0 )
+        {
+        RestoreIrqs( irqLevel );
+        return 0;
+        }    
+
+    length = ( TUint16 )( ( ( TDes8* )iQueue[ iHead ] )->Length() );    
+
+
+    RestoreIrqs( irqLevel );
+
+    return length;
+    }
+
+// -----------------------------------------------------------------------------
+// DIscQueue::DisableIrqs
+// Function to disable interrupts
+// ( other items were commented in a header ).
+// -----------------------------------------------------------------------------
+//
+TInt DIscQueue::DisableIrqs()
+    {
+#ifndef __WINS__
+    return NKern::DisableInterrupts( KIscInterruptLevelTwo );
+#else //__WINS__
+    EnterCriticalSection( &g_IscCriticalSection );
+    return KErrNone;
+#endif//__WINS__
+    }
+
+// -----------------------------------------------------------------------------
+// DIscQueue::RestoreIrqs
+// Function to restore interrupts
+// ( other items were commented in a header ).
+// -----------------------------------------------------------------------------
+//
+#ifndef __WINS__
+void DIscQueue::RestoreIrqs( 
+    TInt aLevel )
+    {
+    NKern::RestoreInterrupts( aLevel );
+#else //__WINS__
+void DIscQueue::RestoreIrqs( 
+    TInt )
+{
+    LeaveCriticalSection( &g_IscCriticalSection );
+#endif//__WINS__
+    }
+
+//  End of File