On 02/16/2017 09:27 AM, 曹子龙 wrote:
>    i review the code of RIOT and did not found the process of timetick
> interrupt of cortex-M3, so ,did this mean it not support the preempt in
> timer interrupt? and round-robin not support ? 

As described in the link given by Ludwig, RIOT has a different
scheduling algorithm: the thread with the highest priority that is
runnable will be run.

Adding round-robin scheduling for threads of one priority can easily
(ten lines of code) be added, but we think it is better in terms of
performance and power consumption to stick with the default algorithm.

Do you have an actual use case?

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