--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wlan_bearer/wlanldd/wlan_symbian/wlanldd_symbian/inc/wllddcircularbuffer.h	Tue Feb 02 02:03:13 2010 +0200
@@ -0,0 +1,141 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "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:   Declaration of the RWlanLddCircularBuffer class.
+*
+*/
+
+/*
+* %version: 2 %
+*/
+
+#ifndef R_WLANCIRCULARBUFFER_H
+#define R_WLANCIRCULARBUFFER_H
+
+class TDataBuffer;
+
+/**
+ * Wlan LDD Shared Memory FIFO queue for Tx packets.
+ * 
+ * @param size The size of the queue in packets.
+ */
+template <TUint size>
+class RWlanCircularBuffer
+    {
+public:
+
+    /* Because this class is mapped into shared memory, it does not have
+     * a constructor or a desctructor.
+     */ 
+
+    /**
+     * Initialization. This method acts as a contructor.
+     */ 
+    inline void DoInit();
+
+    /**
+     * Release. This method acts as a desctructor.
+     */ 
+    inline void Release();
+    
+    /**
+     * This method returns and removes the next packet from the queue.
+     * 
+     * @return Pointer to the meta header attached to the packet on success.
+     *         NULL if the queue is empty.
+     */ 
+    inline TDataBuffer* GetPacket();
+   
+    /**
+     * This method is used to put a packet to the end of the queue.
+     * 
+     * @param aPacket Pointer to the meta header attached to the packet.
+     * @return ETrue if the Packet was added to the queue.
+     *         EFalse if the queue was already full and the Packet could not
+     *         be added to the queue.
+     */ 
+    inline TBool PutPacket( TDataBuffer* aPacket );
+    
+    /**
+     * Returns the next packet in the queue without removing it from the queue.
+     * 
+     * @return Pointer to the meta header attached to the packet on the top 
+     *         of the queue.
+     */
+    inline TDataBuffer* PeekPacket();
+
+    /**
+     * Returns the number of packets in the queue.
+     * 
+     * @return number of packets in the queue.
+     */
+    inline TUint GetLength() const;
+    
+    /**
+     * This method can be used to check if the queue is empty.
+     * 
+     * @return ETrue, when the queue is empty.
+     *         EFalse, when the queue is not empty.
+     */ 
+    inline TBool IsEmpty() const;
+
+    /**
+     * This method can be used to check if the queue is full.
+     * 
+     * @return ETrue, when the queue is full.
+     *         EFalse, when the queue is not full.
+     */ 
+    inline TBool IsFull() const ;
+    
+    /**
+     * This method can be used to check if the queue is active.
+     * 
+     * @param aTimeNow Current time as microseconds since midnight, January 
+     *        1st, 0 AD nominal Gregorian
+     * @return ETrue, if the queue is active.
+     *         EFalse, if the queue is not active.
+     */ 
+    inline TBool IsActive( TInt64 aTimeNow ) const;
+    
+private:    // Data
+    
+    /** Queue as a circular buffer */
+    TDataBuffer* iBuffer[size];
+    
+    /** Index of the packet to get next. See GetPacket() */
+    TUint iGetIndex;
+    
+    /** Index where to put the next packet. See PutPacket() */
+    TUint iPutIndex;
+    
+    /** The number of packets currently in the queue */
+    TUint iPacketAmount;
+   
+    /** The capacity of the queue */
+    TUint iSize;
+    
+    /** 
+    * Time stamp (as microseconds since midnight, January 1st, 0 AD nominal
+    * Gregorian) when the queue became empty. 
+    * Valid only if the queue is empty 
+    */
+    TInt64 iBecameEmptyAt;
+};
+
+#ifdef __KERNEL_MODE__
+
+#include "wllddcircularbuffer.inl"
+
+#endif
+
+#endif /* R_WLANCIRCULARBUFFER_H */