Diff: queue.h

Revision:

0:a03810d46457

Child:

1:2670ac23765f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/queue.h	Fri Oct 22 22:07:25 2010 +0000
@@ -0,0 +1,149 @@
+/* mbed Queue Library
+ * Copyright (c) 2010 William Basser ( wbasser [at] gmail [dot] com )
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MBED_QUEUE_H
+#define MBED_QUEUE_H
+
+#include "mbed.h"
+
+/** queue modle
+ *
+ * Example:
+ * @code
+ *
+ * #include "mbed.h"
+ *
+ * // include the queue library
+ * #include "queue.h"
+ *
+ * Serial myPc( USBTX, USBRX );
+ * Queue myQueue( 1, 5 );
+ *
+ * int main() 
+ * {
+ *    unsigned char   nTemp;
+ *   
+ *    // display the number of items in the queue
+ *    myPc.printf( "Items in queue: %d\r", myQueue.GetNumberOfItems( ));
+ *    
+ *    // add item to queue
+ *    nTemp = 5;
+ *    myQueue.Put( &nTemp );
+ *    nTemp = 6;
+ *    myQueue.Put( &nTemp );
+ *    nTemp = 7;
+ *    myQueue.Put( &nTemp );
+ *    
+ *    // display the number of items in the queue
+ *    myPc.printf( "Items in queue: %d\r", myQueue.GetNumberOfItems( ));
+ *    
+ *    // peek at item at the top of the queue
+ *    myQueue.Peek( &nTemp );
+ *    myPc.printf( "Peek: %d\r", nTemp );
+ *    
+ *    // get an item from queue
+ *    myQueue.Get( &nTemp );
+ *    myPc.printf( "Item 0 = %d\r", nTemp );
+ *    myQueue.Get( &nTemp );
+ *    myPc.printf( "Item 1 = %d\r", nTemp );
+ *    
+ *    // queue should be empty
+ *    if ( !myQueue.Get( &nTemp ))
+ *    {
+ *        // queue is empty
+ *        myPc.printf( "Queue empty!\r" );
+ *    }
+ * }
+ *
+ * @endcode
+ */
+
+class Queue {
+public:
+    /** Create a Queue object
+     *
+     * @param iSize size of the object in queue
+     * @param iCount number of items in the queue
+     */
+    Queue( int iSize, int iCount );
+
+    /** destruction
+     *
+     */
+    virtual ~Queue( void );
+
+    /** Add item to queue
+     *
+     * @param pvItem item to add
+     * @returns true if item added, false if queue full
+     */
+    bool Put( void* pvItem );
+
+    /** get an item from the queue in an IRQ handler
+     *
+     * @param pvItem pointer to the tiem to retrieve
+     * @returns true if item fetched, false if queue is empty
+     */
+    bool GetIrq( void* pvItem );
+    
+    /** Add item to queue from an IRQ handler
+     *
+     * @param pvItem item to add
+     * @returns true if item added, false if queue full
+     */
+    bool PutIrq( void* pvItem );
+
+    /** get an item from the queue
+     *
+     * @param pvItem pointer to the tiem to retrieve
+     * @returns true if item fetched, false if queue is empty
+     */
+    bool Get( void* pvItem );
+    
+    /** get the number of items in the queue
+     * 
+     * @returns the number of items in the queue
+     */
+    int GetNumberOfItems( void );
+    
+    /** peek at the entry at the top of the queue
+     * 
+     * @returns the entry at the top of the queue
+     */
+    bool Peek( void* pvItem );    
+
+    /** flush the queue
+     *
+     */
+    void Flush( void );
+
+
+protected:
+    int              m_iSize;        // size of each item in queue
+    int              m_iCount;        // number of items in the queue
+    unsigned char*   m_pnHead;        // pointer to the head of the queue
+    unsigned char*   m_pnTail;        // pointer to the tail of the queue
+    unsigned char*   m_pnRdIndex;    // read index
+    unsigned char*   m_pnWrIndex;    // write index
+    int              m_iLclCount;    // number of items in queue
+};
+#endif