Hi Daniweb,
I've have an assignment which is to modified the cpp script for ns2 simulation. I need to modify it so that the size is multiply by 2 over 10 interval and change back to the original size after 10 interval. I've changed the code in the modified field, but seems there are some compilation error which i don't know how to solve. I think mainly due to the <size_pointer> variable.
It's kinda urgent. Any help is appreciate.
Thanks.
/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) Xerox Corporation 1997. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linking this file statically or dynamically with other modules is making
* a combined work based on this file. Thus, the terms and conditions of
* the GNU General Public License cover the whole combination.
*
* In addition, as a special exception, the copyright holders of this file
* give you permission to combine this file with free software programs or
* libraries that are released under the GNU LGPL and with code included in
* the standard release of ns-2 under the Apache 2.0 license or under
* otherwise-compatible licenses with advertising requirements (or modified
* versions of such code, with unchanged license). You may copy and
* distribute such a system following the terms of the GNU GPL for this
* file and the licenses of the other code concerned, provided that you
* include the source code of that other code when and as the GNU GPL
* requires distribution of source code.
*
* Note that people who make modified versions of this file are not
* obligated to grant this special exception for their modified versions;
* it is their choice whether to do so. The GNU General Public License
* gives permission to release a modified version without this exception;
* this exception also makes it possible to release a modified version
* which carries forward this exception.
*/
#include <stdlib.h>
#include "random.h"
#include "trafgen.h"
#include "ranvar.h"
/*
* Constant bit rate traffic source. Parameterized by interval, (optional)
* random noise in the interval, and packet size.
*/
class CBR_Traffic : public TrafficGenerator {
public:
CBR_Traffic();
virtual double next_interval(int&,int&);
//HACK so that udp agent knows interpacket arrival time within a burst
inline double interval() { return (interval_); }
protected:
virtual void start();
void init();
double rate_; /* send rate during on time (bps) */
double interval_; /* packet inter-arrival time during burst (sec) */
double random_;
int seqno_;
int maxpkts_;
};
static class CBRTrafficClass : public TclClass {
public:
CBRTrafficClass() : TclClass("Application/Traffic/CBR") {}
TclObject* create(int, const char*const*) {
return (new CBR_Traffic());
}
} class_cbr_traffic;
CBR_Traffic::CBR_Traffic() : seqno_(0)
{
bind_bw("rate_", &rate_);
bind("random_", &random_);
bind("packetSize_", &size_);
bind("maxpkts_", &maxpkts_);
}
void CBR_Traffic::init()
{
// compute inter-packet interval
interval_ = (double)(size_ << 3)/(double)rate_;
if (agent_)
if (agent_->get_pkttype() != PT_TCP &&
agent_->get_pkttype() != PT_TFRC)
agent_->set_pkttype(PT_CBR);
}
void CBR_Traffic::start()
{
init();
running_ = 1;
timeout();
}
double CBR_Traffic::next_interval(int& size, int& size_pointer)
{
// Recompute interval in case rate_ or size_ has changes
interval_ = (double)(size_ << 3)/(double)rate_;
double t = interval_;
if (random_)
t += interval_ * Random::uniform(-0.5, 0.5);
//modified field #####################################################
size_pointer = size_;
size = size_;
if (seqno_ % 10 == 0){
if (size_pointer == size)
size = size_*2;
else
size = size_/2;
}
else
size = size_;
//modified field #####################################################
if (++seqno_ < maxpkts_)
return(t);
else
return(-1);
}
