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/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) 1994 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS 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.
*
* @(#) $Header: /cvsroot/nsnam/ns-2/queue/drop-tail.h,v 1.19 2004/10/28 23:35:37 haldar Exp $ (LBL)
*/
#ifndef ns_drop_tail_h
#define ns_drop_tail_h
#include <string.h>
#include "queue.h"
#include "config.h"
/*
* A bounded, drop-tail queue
*/
class DropTail : public Queue {
public:
DropTail() {
q_ = new PacketQueue;
pq_ = q_;
bind_bool("drop_front_", &drop_front_);
bind_bool("summarystats_", &summarystats);
bind_bool("queue_in_bytes_", &qib_); // boolean: q in bytes?
bind("mean_pktsize_", &mean_pktsize_);
// _RENAMED("drop-front_", "drop_front_");
}
~DropTail() {
delete q_;
}
protected:
void reset();
int command(int argc, const char*const* argv);
void enque(Packet*);
Packet* deque();
void shrink_queue(); // To shrink queue and drop excessive packets.
PacketQueue *q_; /* underlying FIFO queue */
int drop_front_; /* drop-from-front (rather than from tail) */
int summarystats;
void print_summarystats();
int qib_; /* bool: queue measured in bytes? */
int mean_pktsize_; /* configured mean packet size in bytes */
};
#endif
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