Re: [Xen-devel] libxc/evtchn: Missed events when using several handles.

[Vincent Bernardoff <vb@xxxxxxxxxxxxxx>]

On 06/08/2013 11:29, Ian Campbell wrote:
> On Tue, 2013-08-06 at 11:15 +0100, Vincent Bernardoff wrote:
> > >Using the attached test programs, the select fails when using h2, and
> > >works with using h1 (line 41).
> What do yo mean by "fails", does it return an error or does it just
> block waiting for an event which never happens?
It does block waiting for an event which never happens.

> > >It seems that using several evtchn handles does not work correctly. What
> > >is the expected behaviour when using multiple event channel handles ?
> You only appear to bind an evtchn to h1, so I would expect that you
> would only see evtchns on h1 and selecting on h2 will just block waiting
> for something to happen,
It seems to be the case.

 or maybe h2 will return an error because there
> are no evtchns to wait on.
No, this doesn't happen.

If you bind a different evtchn to h2 then you
> should be able to wait on both h1 and h2.
I thought that an handle was an interface to the eventchn, and that 
binding events was completely independant of handles, that is, all 
handles receive all events. I was obviously wrong, but it was not clear 
to guess.
Thanks,

Vincent.


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