Tick interrupt priority?

Chris Johns chrisj at rtems.org
Thu Sep 19 04:32:40 UTC 2019

On 19/9/19 2:16 pm, groups at chichak.ca wrote:
> I was reviewing the interrupt priorities on a project where I’m using FreeRTOS and they want the tick interrupt priority to be very low.
> I found this to be not obvious, then started wondering what the elders of the RTEMS suggest for use with RTEMS.
> Should the tick interrupt be high priority or low?

If all that is happening is the OS tick entry point is being called then I set
the priority below any other sources. If the OS tick routine expires a timer and
readies a task that task will not be dispatched until the outer most interrupt
exits so being any higher does not gain you anything.


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