Re: [lwip-users] multithreaded app ...

[Teratux]

I think the problem goes a bit farther.  netconn_recv blocks waiting for 
a connection.  Even if I use a mutex to exclude between the threads that 
write and read, how can I use netconn_recv in a way that it doesn't 
block if there's no one sending on the other end ?? Is there anything 
like a timeout for the netconn_recv call ??

Thanks ...

On 06/22/10 08:24, Bill Auerbach wrote:
> Since this threading problem comes up weekly it seems, would it be a lot of 
> effort to add an LWIP_MULTITHREADED option and add the semaphore locks in the 
> functions to ensure no reentrancy in lower lwIP code?  I would think 2 simple 
> macros that can expand to nothing or semaphore lock/unlocks could be added to 
> all of the functions making lower level calls.  Or possibly, call a single 
> locking function passing in the function pointer to call after locking.  This 
> might be tricky with arguments I know.
>
> Bill
>
>    
> > -----Original Message-----
> > From: address@hidden
> > [mailto:address@hidden On
> > Behalf Of Simon Goldschmidt
> > Sent: Tuesday, June 22, 2010 5:07 AM
> > To: Mailing list for lwIP users
> > Subject: Re: [lwip-users] multithreaded app ...
> >
> >
> > Kesten, Joerg wrote:
> >      
> > > Additionally we needed to prevent simultaneous calls to "send" even on
> > > different sockets. We added a mutex in the send function itself ...
> > >        
> > This shouldn't be necessary. If it is, there's a bug which should be
> > fixed. Could you provide more details on what exactly went wrong with
> > parallel sends from different netconns/sockets?
> >
> > Simon
> > --
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