Re: [lwip-users] Problems with ASSERTION in tcp_in and tcp_out

[Leon Woestenberg]

Hello Justin,

Justin Bayles wrote:

> > I am not into the netconn_ layer, but shouldn't the sysarch semaphores 
> > already synchronize access to the TCP layer? I.e. are you really seeing
> > concurrent access to both tcp_in and tcp_enqueue?
>
> There is no synchronisation in either tcp_in or tcp_out. I am definitely 
> seeing concurrent access to tcp_in and tcp_out.
Yes, the lwIP core does no synchronization whatsoever (by design). The
higher layer should handle this.

lwIP core = {tcp, udp, icmp, arp, ip}

You said you where not using tcp_*() directly. What is your way of 
sending and receive from TCP? netconn_*()? I.e. what is your higher
layer around the lwIP core?

Regards,

Leon.