Re: [ns]: ns-2.1b7: "instvar" call in Redhat Linux

[Haobo Yu <haoboy@isi.edu>]

This is really wierd, and sounds like a tclcl problem... I'll take a look
and get back to you in a week. Meanwhile, please let me know if you find
anything. Thanks a lot.

- Haobo

On Tue, 11 Apr 2000, Guo, Liang wrote:

> 
> I came across with a very strange problem. I wanted to trace
> a variable defined in TCP agent, say ndatapack_, so I wrote 
> the following code:
> 
> ...
> set tcp [new Agent/TCP]
> ...
> 
> proc monitor {} {
>    global tcp
> 
>    $tcp instvar ndatapack_
> 
>    puts "ndatapack = $ndatapack_"
> 
>    $tcp instvar ndatapack_
>    puts "ndatapack = $ndatapack_"
> }
> 
> $ns at 1.0 "monitor"
> 
> 
> I.e., I printed it twice in the same function, however, I 
> got two different values for ndatapack_, the first one is
> a reasonable value (some positive number), but the
> second one is always 0.
> 
> So I used tcl-debugger to trace the program, and found
> that after "xxx instvar xxxx", ns automatically
> add a statement "set xxxx 0". (Magic!)
> 
> I don't know why this happens, I'm using Red Hat 6.2, and
> installed ns-2.1b7 on it. I ran exactly the same
> piece of code on my Sun Solaris station, which has
> ns-2.1b6 installed, then the problem disappeared.
> Does anyone have the same experience before? I need help
> from you, thanks.
> 
> 
> Guo, Liang 
> 
> guol@cs.bu.edu                     Dept. of Comp. Sci., Boston Univ.,
> 
>