screensaver and power manager dbus interfaces

[Richard Hughes]

On Thu, 2006-06-01 at 12:08 +0200, Jaap Karssenberg wrote:
> Thiago Macieira wrote:
> > Rodrigo Moya wrote:
> >   
> >> On Wed, 2006-05-31 at 17:48 -0700, Bastian, Waldo wrote:
> >>     
> >>> The screensaver interface looks good. What is the use case for the
> >>> "Poke" method?
> >>>       
> >> I guess it can be used by apps like video players to prevent the
> >> screensaver to fire while showing the movie.
> >>     
> >
> > It should be enough to disable the screensaver and re-enable it when done.
> >
> > Disable/enable should be ref-counted so that if two applications ask for 
> > the screensaver to be disabled, both have to ask for it to be turned on 
> > again before it is.

Yes, it is refcounted by use of a cookie.

> What about the case where my video player disables the screensaver and 
> subsequently dies ? When using a "poke" or "beat" interface this is no 
> problem and the screensaver will kick in again when appropriate. On the 
> other hand if the screensaver is waiting for an "enable" call from my 
> video player that never comes this will leave my desktop in an undesired 
> state.

If the app crashes, then we get a bus disconnect from the :foo name,
which we can automatically remove any lock(s) for the application. This
is already done in g-p-m and g-s CVS.

Richard.