Re: [lwip-users] OS-less Active Web Server with RAW API.

[Timmy Brolin]

Leon Woestenberg wrote:

> Hello,
>
> > Why not simply set up a timer interrupts to call tcp_fasttmr() and 
> > tcp_slowtmr() ?
> > That's how I do it.
>
> You could do that, but the interrupt should not pre-empt the running 
> program while it is
> inside the lwIP functions, as this will lead to race conditions and/or 
> concurrency induced crashes.
>
> Leon. 

Of course.
You just disable the timer interrupts during incomming/outgoing packet 
processing, and you disable transmit/recieve interrupts during tcp_tmr 
processing. Or you can just disable interrupts globally during lwip 
processing, unless you have other high-priority interrupts that cannot 
be delayed.

The advantage of using interrupts it that you are free to do whatever 
you want in the main loop while lwip runs happily in the background.

Timmy