Re: [NSWorkspace launchedApplications] issue

[Yen-Ju Chen]

On 8/2/07, Richard Frith-Macdonald <richard@tiptree.demon.co.uk> wrote:
>
> On 2 Aug 2007, at 07:52, Truls Becken wrote:
>
> > On 8/1/07, Andreas Höschler <ahoesch@smartsoft.de> wrote:
> >> Hi all,
> >>
> >> as the name implies launchedApplications is supposed to return only
> >> launched applications. On MacOSX this works as expected. Under
> >> GNUstep
> >> (also with the latest release) I get the full set of installed
> >> applications (whether they are running or not).
> >>
> >> Is there a workaround for this bug? Is see that determining this list
> >> is no easy task since it requires some kind of registration
> >> mechanism.
> >> What's the current approach in GNUstep for doing that?
> >>
> >> I just found some GSDock sources that work ok on MacOSX but not at
> >> all
> >> under GNUstep, mainly because GSDock is based on this
> >> launchedApplications method of NSWorkspace which seems to be
> >> broken in
> >> GNUstep.
> >
> > The documentation for launchedApplications warns that the result is
> > not guaranteed to be up to date. As Yen-Ju mentioned, this is mainly
> > because crashed applications don't notify NSWorkspace when they
> > terminate.
> >
> > That being said, when I have experimented with launchedApplications on
> > earlier releases, it has worked as documented. It has given
> > satisfactory results, except when I have killed applications in some
> > kind of rude way. You should therefore feel free to file a bug report
> > about getting all installed applications.
> >
> > It would also be nice if NSWorkspace in some way managed to always
> > know the correct set of running applications, but I guess that would
> > require some kind of probing which would affect performance. And not
> > only when someone asks what is running, but periodically as it's
> > possible to receive notifications when apps launch or terminate. Since
> > NSWorkspace knows the PID for each application, checking whether the
> > process still exists might be good enough.
>
> Yeah ... I've just finished modifying the code to do two things ...
> 1. check that the pids still exist every time launchedApplications is
> called... not an infallable check for removing dead apps (as the pid
> can be re-used), but pretty good generally.
> 2. check that the apps are still responding if it's more than 30
> seconds since the last time launchedApplications was called.
>
> I'm not sure that (2) is a good idea though ... the check has the
> potential to be very slow and can potentially remove an app from the
> list when it's only temporarily not responding, rather than
> permanently hung.  Thoughts?

  Thanx.
  I think it is good enough for now.
  In AZDock, we do the similar thing,
  but only check when the xwindow of a GNUstep application disappear.
  In that case, it doesn't seems to be slow to me.

  Yen-Ju

>
>
>
> _______________________________________________
> Discuss-gnustep mailing list
> Discuss-gnustep@gnu.org
> http://lists.gnu.org/mailman/listinfo/discuss-gnustep
>