Re: [lwip-users] Threading Question using LWIP with TM4C1294NCPDT

[address@hidden]

On 18.10.2018 22:27, Terence Darwen wrote:
> I'm using LWIP for TCP/IP communication on a TI Tiva microcontroller 
> (a TM4C1294NCPDT).  TI includes LWIP 1.4.1 in its TivaWare package.  
> I've read that LWIP is not threadsafe, however, I'm not sure exactly 
> what that means in my context where I'm using it with no operating 
> system on the single core TI Tiva microcontroller.
> [..]
> Can anyone please clarify?  Thank you.

Honestly, I don't know the setup of this TI port. However, I can clarify 
on the "not threadsafe" thing:

lwIP does *not* include locking schemes to protect against being called 
from multiple threads *or* from a thread/main-loop and/or one or more 
interrupt levels at the same time.
There is some protection (a.k.a. "lightweight prot"), but that mainly 
covers pool allocation.

So if this port is written in a way that calls to lwIP don't run from 
main loop and from interrupt at the same time - and only one interrupt 
runs at a time and isn't interrupted by another interrupt while using 
lwIP - you should be safe.

I can't tell you if it is that way for your port, though.


Simon