Re: [ns] Passing objects to interpreter

[Sudhindra Suresh Bengeri <ssbenger@unity.ncsu.edu>]

I donno if you can get a node down... but one way you can get a link down
at a given time would be to

$ns rtmodel-at [$ns now] down $from $to

Tcl &tcl = Tcl::instance();
tcl.evalf("set ns [Simulator instance];\n$ns  rtmodel-at [$ns now] down
%s %s", fromnode->name(), tonode->name());

If you don't have the object references to the nodes, but only have the
its node id you could use

tcl.evalf("set ns [Simulator instance];\n$ns  rtmodel-at [$ns now] down
[$ns set Node_(%d)] [$ns set Node_(%d)]", fromnodeId, toNodeId);

hope that is what you wanted.

Pls. correct me/ if there is another better way lemme know coz
something like this is what I use most of the times.

Regards,
Sudhin.

On Tue, 20 Mar 2001, Prasad V. Boddupalli
wrote:

> Hi,
>    I am trying out alternate routing strategies in ns. I want to a link
> down if the no if packets sent over that link crosses a certain threshold.
> So, I changed the datastructure in the classifier and had the following
> code in classifier.cc.
>
>
> NsObject* Classifier::find(Packet* p)
> {
> 	NsObject* node = NULL;
> 	int cl = classify(p);
>
> 	if (cl < 0 || cl >= nslot_ || (node = slot_[cl].next_hop) == 0) {
> 		if (default_target_) return default_target_;
> 		......... removed some code ........
> 	}
>
> 	slot_[cl].no_pkts++;
>         if (slot_[cl].no_pkts == THRESHOLD) {
>
> 	--->	char cmd[] = "$node down";
> 	--->	Tcl &tcl = Tcl::instance();
>
> 	--->	tcl.evalf("%s down", node->name());
> 	}
> 	return (node);
> }
>
> However I am unable to pass the link object to the interpreter (from
> C++) so that the instproc "down" is invoked on that link. How I can do
> that ? I didn't completely get this interface between the compiled and the
> interpreted hierarchy. Can someone help me out ?
>
>
> thanks,
> Prasad Boddupalli.
>
>
>

****************** Sudhindra Suresh Bengeri ********************
Graduate Research Assistant   | Home:                          |
to Dr. George N. Rouskas      | 2110, Gorman St.,              |
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