Messages in this thread | | | Subject | Re: Considerations on sched APIs under RT patch | From | Peter Zijlstra <> | Date | Wed, 21 Apr 2010 21:57:13 +0200 |
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On Wed, 2010-04-21 at 21:24 +0200, Primiano Tucci wrote: > Is it sure that calling a scheduler api won't induce a re-scheduling > of the caller process (e.g. as in the case of a lock held by another > processor)? It would be very unpleasant if the scheduling apis can > induce re-scheduling, making the realization of a Real Time scheduling > infrastructure completely un-deterministic.
No, any syscall can end up blocking/scheduling there are no exceptions. But blocking doesn't mean its non-deterministic, esp. when coupled with things like PI.
But you do have to treat system resources as such, that is they can (and will) create cross-cpu dependencies, if you do not take that into account you will of course be surprised.
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