That I didn't realize. Now it makes sense, thanks!
Keir Fraser wrote:

On 31/12/2009 23:16, "Matthew Fioravante" <Matthew.Fioravante@xxxxxxxxxx>
wrote:

mini-os is a uniprocessor and non-preemptive OS so unless your thread
blocks, an irq handler (in this case event channel handler) will never
be run and thus won't be able to touch your critical sections.

What makes you think that? 'Non-preemptive' doesn't mean that you can't be
interrupted by irq context. That's why they're called interrupts!
 -- Keir

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