Re: [ns] Polling vs. Message Passing? (fwd)

[Xuan Chen <xuanc@ISI.EDU>]

you may find the following description helpful. Thanks.

-chen

---------- Forwarded message ----------
Date: 04 Jan 2002 11:55:25 -0800
From: Tim Buchheim <buchheim@ISI.EDU>
To: Xuan Chen <xuanc@ISI.EDU>
Subject: Re: [ns] Polling vs. Message Passing? (fwd)

On Thu, 2002-01-03 at 20:12, Xuan Chen wrote:
...

This guy wants a way to know when a certain number of packets have been
received "at a particular node" (I'm guessing he really means "by a
particular agent")

I think he can do this by creating an Application to count packets. 
Create an Application object in tcl. Then use instproc to give it a recv
method which counts packets and does something when the magic number is
reached.

Something like this would probably work (but I haven't tried it)


set app [new Application]
# install a recv method on this object.  If more than one is needed, then
# an actual subclass of Application would be a good idea.
$app instproc recv {num_bytes} {
   $self instvar count
   incr count
   if {$count > $some_number} then {
      # do something
   }
}

$app attach-agent $receiving_agent
# receiving_agent is the agent receiving the packets





> ---------- Forwarded message ----------
> Date: Thu, 3 Jan 2002 19:12:48 -0500 (EST)
> From: Stanley M Bielski <bielski@ece.cmu.edu>
> To: ns-users@ISI.EDU
> Subject: [ns] Polling vs. Message Passing?
> 
> 
> Hi all,
> 
> I'm running a simulation that requires new agents to spawn after X number
> of packets have been received at particular nodes of interest. I've found
> that the only way I can do this so far is by using a loop that
> periodically checks the highest acknowledgement received. Unfortunately,
> this is seriously degrading my system performance. 
> 
> Are there any wait & notify / message-passing methods in Tcl or OTcl to
> get around this? How about C++?
> 
> Many Thanks
> -Stan


-- 
Tim Buchheim