Re: [lwip-members] TCP question about tcp_output.c/tcp_enqueue()

[Adam Dunkels]

Hi!

On Wed, 2003-01-08 at 11:37, Kieran Mansley wrote:
> > Can someone explain to me what the "while (queue == NULL" does in
> >
> > tcp_output.c/tcp_enqueue()
> > {
> >   ...
> >   while(queue == NULL || left > 0) {
> >   ...
> 
> Looks to me like it's doing nothing, as queue will always be non-NULL by
> the end of the loop.  It does ensure the loop gets executed if left = 0
> before the loop though (because queue is always NULL before the loop).
> ie. It makes it equivalent to:
> 
> do{
>  ...
> }while(left > 0);
> 
> but I'm not sure if that is intended or just a side effect.

Yes, the intention is just what you describe. Perhaps it should be
changed to a do{}while() loop instead, just to make it clearer?

/adam
-- 
Adam Dunkels <address@hidden> 
http://www.sics.se/~adam/