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Re: [lwip-users] [lwip users] using threads in our application safely ??

From: Christiaan Simons
Subject: Re: [lwip-users] [lwip users] using threads in our application safely ???
Date: Mon, 10 Oct 2005 16:35:29 +0200

>      I use the TFTP server from the linux system , not from the lwip
> .While getting a file from the remote server,  I can observe the
> first 512 bytes (which tftp server has to send ) on my client side ,
> using ethereal , but as I said  tapif_input halts after some time ,
> I thought it would be the problem from my TFTP client timeout
> mechanism , so I increased the timeout of my TFTP client , no change.

Ah, thus the TFTP client runs on top of lwip.

Does the server get a proper ACK from the client, in time?
The timeout of your server can play a major role here.

>      I created only a single thread , there are no multiple threads
> , I saw in one of the lwip message list that we should create a new
> thread for sending and receiving , I do not know about my
> application , whether to use multiple threads . I have no idea of
> threading  , So I asked for an explanation of the thread mechanism
> which can be used safely in our applications,

There are 2 examples in the contrib/ports/unix tree.
The 'simhost' example uses the netconn/socket api which you
probably use. Follow this as a reference.

>     Gprof , is ok with normal applications , but it has problems
> with threaded applications on Linux ,  Can we write an application
> on lwip  with out threading ...?`?? If so how can we do this...?

I just recommend not to use it.
Profiling won't help solving this issue anyway.

>   Please see the code when you find some time....


Christiaan Simons

Hardware / Software Engineer
Axon Digital Design

+31 (0)13 511 66 66
+31 (0)13 511 41 51


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