[lwip-devel] Re: Semaphores and socket.c's event_callback

[Samuel Thibault]

Hi,

Simon Goldschmidt wrote:
> > src/api/sockets.c uses a semaphore (selectsem) for protecting
> > critical sections of select().  The result is that event_callback()
> > may want to sleep, which is a problem if one wants to call event_callback()
> > from an interrupt handler for instance.
> 
> Calling event_callback from an interrupt handler is not supported!
> ...
> ip_input() would perhaps enter tcp_input() which shares states with
> tcp_output(),

Ah, ok, that probably explains the troubles I've been getting.

Thanks!
Samuel