Tracking whether a connection is alive

[Kay Sievers]

On Tue, 2004-07-13 at 18:03 +0200, David Zeuthen wrote:
> On Tue, 2004-07-13 at 17:47 +0200, Kay Sievers wrote:
> > I want to discuss another approach here:
> > 
> > HAL keeps track of the locks and it's mandatory for the lock owner to
> > respond with the "reason" of holding the lock, when asked for.
> > The "reason" returned can be easily interpreted by the _user_ and the
> > user can take the appropriate action to solve the conflict.
> > (think of a CD burning application, that displays a list of all you cd-
> > drives with a live list of current activity going on from other
> > applications)
> > 
> > If the lock is released, the application is notified by dbus and can
> > display the now idle device and let the user start the new job on it.
> > It should also be possible to specify:
> > "start burning CD after <locking app> has finished <reason>"
> > 
> > It would be really nice feature. (think of a device manager, that
> > displays the current activity for all active devices)
> > 
> > What do you think?
> > 
> 
> I think it's a nice feature, but I don't like forcing the application
> holding the lock to respond. Thinking a bit more about it, how about
> this:
> 
>  1. When acquiring the lock the application MAY give
> 
>     - name of application, localised
>       - "Nautilus CD Burner"
>       - "Nautilus CD Brenner"
> 
>     - name of reason, again localised
>       - "Burning disc DATA_20040713"
>       - "Brennen platte DATA_20040713"
>     
>     and on the locked dev these are stored in info.locked.app_name and 
>     info.locked.app_reason and these goes away when info.locked is FALSE
> 
> Does it make sense to make the name and reason optional? And should we
> do a better job of localisation? E.g. is it sane to assume that all
> applications run in the same locale? I think it is...

Hmm, what about HAL returns only a handle to the locking application.
The asking application asks the lock-holding directly for the reason and
the name. This way, the lock holder may return the info in the locale of
the asking app?

Kay


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