Re: [Xen-devel] Sched_op hypercall small questions

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 19/09/2011 22:21, "Daniel Castro" <evil.dani@xxxxxxxxx> wrote:

> Greetings all.
> 
> Some small question regarding schedule poll operation hypercall.
> 
> 1. struct sched_poll poll.timeout is measured in what unit of time?
> Secs, ms? ns?

It is an absolute system time (rather than a duration), in nanoseconds.

> 2. After issuing the hypercall_sched_op(SCHEDOP_poll, &poll); if no
> timeout is used in poll struct how long will I yield the CPU?

Until one of the specified event channel ports is pending.

> 3. If I issue the hypercall and the event never comes is it possible
> to to yield the CPU for ever?

Yes, if you do not specify a timeout.

 -- Keir

> Thanks you very much for answering these questions.
> 
> Daniel Castro



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