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
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