[Xen-devel] Re: [Qemu-devel] [PATCH RFC V1 02/11] qemu-timer: Introduce qemu_run_one_timer

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

On 10/04/2011 12:27 PM, Jan Kiszka wrote:
> On 2011-10-04 16:51, Anthony PERARD wrote:
> > Used by the Xen PCI Passthrough code to run the timer about the power
> > state transition.
> >
> > Signed-off-by: Anthony PERARD<anthony.perard@xxxxxxxxxx>
> > ---
> >   qemu-timer.c |   15 +++++++++++++++
> >   qemu-timer.h |    3 +++
> >   2 files changed, 18 insertions(+), 0 deletions(-)
> >
> > diff --git a/qemu-timer.c b/qemu-timer.c
> > index 46dd483..15e659b 100644
> > --- a/qemu-timer.c
> > +++ b/qemu-timer.c
> > @@ -1163,3 +1163,18 @@ int qemu_calculate_timeout(void)
> >       return 1000;
> >   }
> >
> > +/* run the specified timer */
> > +void qemu_run_one_timer(QEMUTimer *ts)
> > +{
> > +    uint64_t current_time;
> > +
> > +    /* remove timer from the list before calling the callback */
> > +    qemu_del_timer(ts);
> > +
> > +    while ((current_time = qemu_get_clock_ms(rt_clock))<  ts->expire_time)
> > +        /* sleep until the expire time */
> > +        usleep((ts->expire_time - current_time) * 1000);
> > +
> > +    /* run the callback */
> > +    ts->cb(ts->opaque);
> > +}
> This looks funny. I can't imagine that this could ever fit into the
> standard (asynchronous) QEMU execution model for I/O. Keep it private to
> Xen?
I think it's funny for Xen too.  Why in the world would you need this?

Regards,

Anthony Liguroi

> Jan

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