delay.cc

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1996-1997 The 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 Network Research
 *      Group at Lawrence Berkeley National 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.
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#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/link/delay.cc,v 1.26 1999/09/09 03:22:36 salehi Exp $ (LBL)";
#endif

#include "delay.h"
#include "mcast_ctrl.h"
#include "ctrMcast.h"

static class LinkDelayClass : public TclClass {
public:
        LinkDelayClass() : TclClass("DelayLink") {}
        TclObject* create(int /* argc */, const char*const* /* argv */) {
                return (new LinkDelay);
        }
} class_delay_link;

LinkDelay::LinkDelay() : dynamic_(0), itq_(0)
{
        bind_bw("bandwidth_", &bandwidth_);
        bind_time("delay_", &delay_);
}

int LinkDelay::command(int argc, const char*const* argv)
{
        if (argc == 2) {
                if (strcmp(argv[1], "isDynamic") == 0) {
                        dynamic_ = 1;
                        itq_ = new PacketQueue();
                        return TCL_OK;
                }
        } else if (argc == 6) {
                if (strcmp(argv[1], "pktintran") == 0) {
                        int src = atoi(argv[2]);
                        int grp = atoi(argv[3]);
                        int from = atoi(argv[4]);
                        int to = atoi(argv[5]);
                        pktintran (src, grp);
                        Tcl::instance().evalf("%s puttrace %d %d %d %d %d %d %d %d", name(), total_[0], total_[1], total_[2], total_[3], src, grp, from, to);
                        return TCL_OK;
                }
        }

        return Connector::command(argc, argv);
}

void LinkDelay::recv(Packet* p, Handler* h)
{
        double txt = txtime(p);
        Scheduler& s = Scheduler::instance();
        if (dynamic_) {
                Event* e = (Event*)p;
                e->time_= txt + delay_;
                itq_->enque(p); // for convinience, use a queue to store packets in transit
                s.schedule(this, p, txt + delay_);
        } else {
                s.schedule(target_, p, txt + delay_);
        }
        s.schedule(h, &intr_, txt);
}

void LinkDelay::send(Packet* p, Handler*)
{
        target_->recv(p, (Handler*) NULL);
}

void LinkDelay::reset()
{
        Scheduler& s= Scheduler::instance();

        if (itq_ && itq_->length()) {
                Packet *np;
                // walk through packets currently in transit and kill 'em
                while ((np = itq_->deque()) != 0) {
                        s.cancel(np);
                        drop(np);
                }
        }
}

void LinkDelay::handle(Event* e)
{
        Packet *p = itq_->deque();
        assert(p->time_ == e->time_);
        send(p, (Handler*) NULL);
}

void LinkDelay::pktintran(int src, int group)
{
        int reg = 1;
        int prune = 30;
        int graft = 31;
        int data = 0;
        for (int i=0; i<4; i++) {
                total_[i] = 0;
        }

        if (! dynamic_)
                return;

        int len = itq_->length();
        while (len) {
                len--;
                Packet* p = itq_->lookup(len);
                hdr_ip* iph = hdr_ip::access(p);
                if (iph->flowid() == prune) {
                        if (iph->saddr() == src && iph->daddr() == group) {
                                total_[0]++;
                        }
                } else if (iph->flowid() == graft) {
                        if (iph->saddr() == src && iph->daddr() == group) {
                                total_[1]++;
                        }
                } else if (iph->flowid() == reg) {
                        hdr_CtrMcast* ch = hdr_CtrMcast::access(p);
                        if (ch->src() == src+1 && ch->group() == group) {
                                total_[2]++;
                        }
                } else if (iph->flowid() == data) {
                        if (iph->saddr() == src+1 && iph->daddr() == group) {
                                total_[3]++;
                        }
                }
        }
        //printf ("%f %d %d %d %d\n", Scheduler::instance().clock(), total_[0], total_[1], total_[2],total_[3]);
}

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