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

[Kieran Mansley]

On Wed, 8 Jan 2003 address@hidden wrote:

> Hello,
>
> I'm tracing a TCP performance issue (web serving using httpd.c is very
> slow).
>
> 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.

Kieran