Re: [lwip-users] how to cancel a netconn conncetion?

[address@hidden]

I suppose you mean "cancel the netconn accepting" as netconn_accept() is 
the blocking call, not netconn_listen()?

This has been covered numerous times on this list: The netconn and 
socket API is *not* designed to let one connection (or socket) be used 
simultaneously from more than one thread. One thread blocking and one 
calling xxx_close() involves two threads -> not supported!

Instead, register a callback for the listening netconn. When this 
callback is called with REVEIVE_PLUS (use a mutex or whatever you want 
to wait for it), call netconn_accept and it won't block. That's the way 
select() is implemented for the socket API.

You then only have to be able to cancle your waiting-for-the-callback 
from your other thread and you're done.

Simon


Bertrand Van Kempen wrote:
> Hello,
>  
> I'm using the netconn API to implement a HTTP server.
> All works fine but I don't found how to cancel the "netconn listening" to exit 
> properly in my application.
> I tried to call netconn_close and netconn_delete but the working thread still 
> wait on netconn_accept(m_pConn);
>  
> Thanks in advance for your help,
>  
> Bertrand van Kempen
>  
>  
> I do the following:
>  
> I initialize an TCP connection from the main thread:
>  
> m_pConn = netconn_new(NETCONN_TCP);
>
> netconn_bind(m_pConn, IP_ADDR_ANY, 80) 
>
> netconn_listen(m_pConn);
>
> and, from another thread I call the following in a loop:
>
> while(m_bContinue)
>
> {
>
> struct netconn *newconn;
>
> MTAL_DP("{");
>
> newconn = netconn_accept(m_pConn);
>
> if(newconn){
>
> http_server_serve(newconn);
>
> netconn_delete(newconn);
>
> }
>
> }
>
> Then, I tried to do the following form the main thread:
>
> m_bThreadContinue = false;
>
> if(m_pConn)
>
> {
>
> netconn_close(m_pConn);
>
> netconn_delete(m_pConn); 
>
> m_pConn = NULL;
>
> }
>
>
>
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