[riot-devel] UDP datagram sending

Peter Kietzmann peter.kietzmann at haw-hamburg.de
Wed Jun 8 10:34:00 CEST 2016


Hi Mateusz,

hard to figure out from afar. Do you have your code available on github?

Regarding 1): I don't know how this should be related to you memory 
violation issue.

Regarding 2): AFAIK your thread will have the priority that you give on 
initialization, no matter from where  it is created.

Best
Peter

Am 07.06.2016 um 11:26 schrieb Mateusz Kubaszek:
> Hi,
>
>  > can you elaborate on how it "doesn't work"?
>
> After the message is sent, the reading thread doesn't receive it. I have
> been watching what is going on in "gnrc_netapi_dispatch" function. The
> destination pid is correct and there wasn't a problem with message
> sending. Destination PID is 6 which is the udp thread (I put there a
> printf statement indicating any incoming message).
>
> I finally resolved the problem yesterday's night. I was certain about
> it, but now I repeated a couple of tests and I don't know why it is
> working properly... The UDP thread's priority equals 5, the same
> priority has my sending thread. After I lowered my thread's priority to
> be lesser than udp's (lets say 6) all began to work properly. Today I
> retried the test and all seems to work no matter what my thread priority
> is. So maybe there was another bug in my code. Sorry to bother you.
>
> But I have two more things that puzzles me. Why the program is aborting
> as a result of memory access violation after my thread has been:
> 1) Initialized with flag THREAD_CREATE_WOUT_YIELD
> 2) Has lower or the same priority as main thread from which it was created.
>
> The platform I am running my program on is native (Linux).
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-- 
Peter Kietzmann

Hamburg University of Applied Sciences
Dept. Informatik, Internet Technologies Group
Berliner Tor 7, 20099 Hamburg, Germany
Fon: +49-40-42875-8426
Web: http://www.haw-hamburg.de/inet


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