[lwip-users] Re: Struggling to build a TCP echo server (Kieran Mansley)

[Chen]

Kieran, Thanks for your reply!

What is the rule of thumb to allocate enough PCBs to handle 
multiple
connections?

Any dos and donts for using lwIP in threads?

Chen

Date: Fri, 13 Feb 2009 16:48:03 +0000
From: Kieran Mansley <address@hidden>
Subject: Re: [lwip-users] Struggling to build a TCP echo server
To: Mailing list for lwIP users <address@hidden>
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        <address@hidden>
Content-Type: text/plain

On Fri, 2009-02-13 at 10:50 -0500, Chen wrote:
> First, thanks to all the helping hands from the group!
>
> Weighing my options, I decided to use "real" socket programming
> instead of TCI_* raw APIs.
>
> Attached is the codes of a working echo server, running on FreeRTOS.
>
> After getting it to work, I tried to implement two echo servers on
> FreeRTOS.
>
> I duplicated the codes to a different thread, on a different port, and
> fired it up, none worked. It seems as long as I have one socket
> opened, the other will not be able to work.

Two things:

1) You should be very careful when using multiple threads with lwIP: it
is not thread-safe.

2) You may not have allocated enough PCBs to handle multiple
connections.  Check your lwipopts.h

Kieran