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packet_queue.h
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packet_queue.h
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/*
* Copyright (c) 2010, Regents of the University of California
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the University of California, Berkeley nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDcING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
* Queue (FIFO) for Packets
*
* by Aaron M. Hoover
*
* v.beta
*
* Revisions:
* Aaron M. Hoover 2010-09-02 Initial release
*
* Notes:
*
* Usage:
*
* #include "payload_queue.h"
* #include "payload.h"
*
* int max_size = 2;
* unsigned char *item;
* unsigned char type;
* unsigned char status;
*
* PayQueue que = pqInit(max_size);
*
* unsigned char *str1 = " Hello, World!";
* unsigned char *str2 = " Hi, there.";
* unsigned char *str3 = " What's up?";
*
* str1[0] = str2[0] = STATUS_SKEPTICAL;
* str1[1] = str2[1] = TYPE_BLUFFING;
*
* Payload pay;
* Payload pay1 = payCreateFromString(str1, strlen(str1));
* Payload pay2 = payCreateFromString(str2, strlen(str2));
* Payload pay3 = payCreateFromString(str3, strlen(str3));
*
* pqPush(que, pay1);
* pqPush(que, pay2);
* pqPush(que, pay3);
*
* // size of the queue is still now 2
* // and pay1 is already dropped.
*
* pay = pqPop(que); // pay is now pay2
* pay = pqPop(que); // pay is now pay3
*
*/
#ifndef __PACKET_QUEUE_H
#define __PACKET_QUEUE_H
#include "queue.h"
#include "mac_packet.h"
//typedef generic pointer type, Item;
typedef Queue PacketQueue;
/******************************************************************************
* Function Name : queueInit
* Description : Create an instance of Queue with a given maximum size.
* Parameters : The maximum size of items in the queue. Incoming items are
* ignored if the queue is full
* Return Value : An instance of Queue
*******************************************************************************/
PacketQueue pktqInit(int max_size);
/******************************************************************************
volatile PayQueue
* Function Name : pqPush
* Description : Insert an item at the end of queue.
* Parameters : A queue and an item to be inserted. The item can be any
* pointer type
* Return Value : If the queue is full, the first item in the queue will be
* dropped
*******************************************************************************/
void pktqPush(PacketQueue pq, MacPacket mp);
/******************************************************************************
* Function Name : pqPop
* Description : Pop out the item from the front of queue.
* Parameters : A queue...
* Return Value : The Payload struct located at the front of the queue.
*******************************************************************************/
MacPacket pktqPop(PacketQueue queue);
/******************************************************************************
* Function Name : pqGetFront
* Description : Get out the item from the front of queue.
* Parameters : A queue...
* Return Value : The Payload struct located at the front of the queue.
*******************************************************************************/
MacPacket pktqGetFront(PacketQueue queue);
/******************************************************************************
* Function Name : pqIsFull
* Description : Test if the queue is full.
* Parameters : A queue...
* Return Value : 1 will be returned if the queue is full. Otherwise, 0 will be
* returned.
*******************************************************************************/
int pktqIsFull(PacketQueue queue);
/******************************************************************************
* Function Name : pqIsEmpty
* Description : Test if the queue is empty.
* Parameters : A queue...
* Return Value : 1 will be returned if the queue is empty. Otherwise, 0 will be
* returned.
*******************************************************************************/
int pktqIsEmpty(PacketQueue queue);
/******************************************************************************
* Function Name : pqGetSize
* Description : Get the current size of the queue.
* Parameters : A queue...
* Return Value : the current size of the queue.
*******************************************************************************/
int pktqGetSize(PacketQueue queue);
#endif // __PACKET_QUEUE_H