static void prvCheckDelayedList( void )
{
corCRCB *pxCRCB;

	xPassedTicks = xTaskGetTickCount() - xLastTickCount;
	while( xPassedTicks )
	{
		xCoRoutineTickCount++;
		xPassedTicks--;

		/* If the tick count has overflowed we need to swap the ready lists. */
		if( xCoRoutineTickCount == 0 )
		{
			xList * pxTemp;

			/* Tick count has overflowed so we need to swap the delay lists.  If there are
			any items in pxDelayedCoRoutineList here then there is an error! */
			pxTemp = pxDelayedCoRoutineList;
			pxDelayedCoRoutineList = pxOverflowDelayedCoRoutineList;
			pxOverflowDelayedCoRoutineList = pxTemp;
		}

		/* See if this tick has made a timeout expire. */
		while( listLIST_IS_EMPTY( pxDelayedCoRoutineList ) == pdFALSE )
		{
			pxCRCB = ( corCRCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedCoRoutineList );

			if( xCoRoutineTickCount < listGET_LIST_ITEM_VALUE( &( pxCRCB->xGenericListItem ) ) )
			{
				/* Timeout not yet expired. */
				break;
			}

			//portDISABLE_INTERRUPTS();
PortDisableInt_NoNest();
			{
				/* The event could have occurred just before this critical
				section.  If this is the case then the generic list item will
				have been moved to the pending ready list and the following
				line is still valid.  Also the pvContainer parameter will have
				been set to NULL so the following lines are also valid. */
				uxListRemove( &( pxCRCB->xGenericListItem ) );

				/* Is the co-routine waiting on an event also? */
				if( pxCRCB->xEventListItem.pvContainer )
				{
					( void ) uxListRemove( &( pxCRCB->xEventListItem ) );
				}
			}
//			portENABLE_INTERRUPTS();
PortEnableInt_NoNest();

			prvAddCoRoutineToReadyQueue( pxCRCB );
		}
	}

	xLastTickCount = xCoRoutineTickCount;
}

signed portBASE_TYPE xCoRoutineCreate( crCOROUTINE_CODE pxCoRoutineCode, unsigned portBASE_TYPE uxPriority, unsigned portBASE_TYPE uxIndex )
{
signed portBASE_TYPE xReturn;
corCRCB *pxCoRoutine;

	/* Allocate the memory that will store the co-routine control block. */
	pxCoRoutine = ( corCRCB * ) pvPortMalloc( sizeof( corCRCB ) );
	if( pxCoRoutine )
	{
		/* If pxCurrentCoRoutine is NULL then this is the first co-routine to
		be created and the co-routine data structures need initialising. */
		if( pxCurrentCoRoutine == NULL )
		{
			pxCurrentCoRoutine = pxCoRoutine;
			prvInitialiseCoRoutineLists();
		}

		/* Check the priority is within limits. */
		if( uxPriority >= configMAX_CO_ROUTINE_PRIORITIES )
		{
			uxPriority = configMAX_CO_ROUTINE_PRIORITIES - 1;
		}

		/* Fill out the co-routine control block from the function parameters. */
		pxCoRoutine->uxState = corINITIAL_STATE;
		pxCoRoutine->uxPriority = uxPriority;
		pxCoRoutine->uxIndex = uxIndex;
		pxCoRoutine->pxCoRoutineFunction = pxCoRoutineCode;

		/* Initialise all the other co-routine control block parameters. */
		vListInitialiseItem( &( pxCoRoutine->xGenericListItem ) );
		vListInitialiseItem( &( pxCoRoutine->xEventListItem ) );

		/* Set the co-routine control block as a link back from the xListItem.
		This is so we can get back to the containing CRCB from a generic item
		in a list. */
		listSET_LIST_ITEM_OWNER( &( pxCoRoutine->xGenericListItem ), pxCoRoutine );
		listSET_LIST_ITEM_OWNER( &( pxCoRoutine->xEventListItem ), pxCoRoutine );
	
		/* Event lists are always in priority order. */
		listSET_LIST_ITEM_VALUE( &( pxCoRoutine->xEventListItem ), configMAX_PRIORITIES - ( portTickType ) uxPriority );
		
		/* Now the co-routine has been initialised it can be added to the ready
		list at the correct priority. */
		prvAddCoRoutineToReadyQueue( pxCoRoutine );

		xReturn = pdPASS;
	}
	else
	{		
		xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
	}
	
	return xReturn;	
}

static void prvCheckPendingReadyList( void )
{
    /* Are there any co-routines waiting to get moved to the ready list?  These
    are co-routines that have been readied by an ISR.  The ISR cannot access
    the	ready lists itself. */
    while ( listLIST_IS_EMPTY( &xPendingReadyCoRoutineList ) == pdFALSE ) {
        corCRCB *pxUnblockedCRCB;

        /* The pending ready list can be accessed by an ISR. */
        portDISABLE_INTERRUPTS();
        {
            pxUnblockedCRCB = ( corCRCB * ) listGET_OWNER_OF_HEAD_ENTRY( (&xPendingReadyCoRoutineList) );
            ( void ) uxListRemove( &( pxUnblockedCRCB->xEventListItem ) );
        }
        portENABLE_INTERRUPTS();

        ( void ) uxListRemove( &( pxUnblockedCRCB->xGenericListItem ) );
        prvAddCoRoutineToReadyQueue( pxUnblockedCRCB );
    }
}