[openbeos] Re: BeOS scheduling
- From: François Revol <revol@xxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Thu, 15 Aug 2002 23:22:53 +0200 (MEST)
En réponse à Manuel Jesus Petit de Gabriel <freston@xxxxxxxxxxx>:
>
> > >Now, having a fixed quantum does not mean that your timer
> resolution
> > >(for awaking threads for instance) is as coarse as the quantum
> > >(althought in some other OSes it is). BeOS scheduler (and timeout
> > >queues) is not tied to any kind of periodic tick.
> >
> > I read that the timer tick was 1ms, and the scheduler did task
> > switching on every third tick (3ms). That would give the 1ms timing
> > resolution.
>
> That's not even close to truth.
>
> There is no periodic tick in BeOS. There is a time based callout queue
> that
> is used by the scheduler itself. NewOS implementation is close enough
> to
> what BeOS did to give you an idea.
>
>
Hmm that's why BeOS behaves so strangely in VMWare...
François.
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