Re: [lwip-users] SYS mbox

[address@hidden]

Per Klint wrote:
> > > I'd rather not change the lwip stack code. But perhaps it is possible
> > > to replace all calls to sys_mbox_trypost with sys_mbox_post instead?
> > Why would you need that?
> To avoid to lose any messages!
> But if it needs to work from ISR it's ofcourse not an option to do that.

And let me add to that that you would risk a deadlock when convertin all 
_trypost calls to blocking calls: the thread that would drain the mbox 
might be blocked trying to execute something in the tcpip_thread.

In general, RX packets (from netif to lwIP or from lwIP to your 
application) are just dropped when an mbox is full.

The only other place where sys_mbox_trypost is used is tcpip_callback, 
which is used by the application only (or from other functions wich 
return an error code if tcpip_callback fails).

Simon