[libbsd] EPOCH(9): Fix epoch call and drain

[Sebastian Huber]

On 15/06/2021 17:10, Gedare Bloom wrote:
> Does this add a constraint in libbsd that it only works with SMP for
> schedulers that support thread pinning? Is that a problem at all? Last
> I checked, not all the SMP schedulers have pinning. Actually, I think
> only the EDF SMP scheduler supports pinning.

In SMP configurations, a scheduler with thread pinning support is 
required by libbsd. This is not a new constraint. The thread pinning 
support was specifically implemented to support EPOCH(9).

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