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

From: Durgaprasad Chivukula
Subject: Re: [lwip-users] [lwip users] using threads in our application safely ???
Date: Mon, 10 Oct 2005 14:52:15 +0200

On 10/10/05, Christiaan Simons <address@hidden> wrote:

lwip-users-bounces+christiaan.simons=address@hidden wrote on 10-10-2005

>Posting code doesn't make the coders actually look at it,
>most of us dislike that. If you want implementation support
>you should be more specific than 'it doesn't work' and describe
>the problem in text please.
      I mean to say that , I posted this question already , but did not get any reply .. I do not mean with the code...  

>Ah this is better,
>As far as I can remember the TFTP protocol uses a state-machine.
>Can you tell us in which state the server is? And can you make
>the state transitions visible?
     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.

>Please do not guess, do you know whats actually going on in the code?

>If there are multiple threads in the design you shouldn't remove
> or disable them. What are these threads for?
     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,

>Ah, do not use gprof. For another project a colluege of mine
>crippled some code by adding profiling flags to a Makefile.
    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...?

>It took me a week to find the root-cause.
   Where is the problem found , I mean the root cause of the probelm...???

>Sorry, I'm not going to look at your code for now.
  Please see the code when you find some time....
Durga  Prasad


Christiaan Simons

Hardware / Software Engineer
Axon Digital Design

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


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