[leveller] Re: Vista 'not responding' non-issue
- From: "John Gwinner" <jgwinner@xxxxxxxxx>
- To: <leveller@xxxxxxxxxxxxx>
- Date: Wed, 14 Oct 2009 17:20:26 -0500
That seems reasonable though - what messages aren't being responded to?
== John ==
> -----Original Message-----
> From: leveller-bounce@xxxxxxxxxxxxx
[mailto:leveller-bounce@xxxxxxxxxxxxx] On
> Behalf Of Ray Gardener
> Sent: Wednesday, October 14, 2009 3:21 PM
> To: leveller@xxxxxxxxxxxxx
> Subject: [leveller] Re: Vista 'not responding' non-issue
>
> A fix for Vista's misinterpretation of Leveller being non-responsive
> appears to work, so it will be available in subsequent Leveller 3.1
builds.
>
> What was happening is that Vista "ghosts" an app's window if the app
is
> not consuming enough messages from its event message queue. The app
> window is copied to a buffer that Vista manages, making the window
> moveable, but also prone to being misdrawn (there seems to be some
> display copy problem if the app uses OpenGL, at least under Aero).
>
> The behavior was supposed to occur on Windows XP as well, but I never
> saw it happen there.
>
> Ray
>
>
>
> Ray Gardener wrote:
> > I've noticed that Vista (on my laptop anyway) misinterprets
applications
> > (such as Leveller) that undertake long processes so that the "Not
> > Responding" phrase appears in Leveller's title bar and the app
window
> > seems frozen. It doesn't seem to matter that the processes are
> > interruptible and regularly update the display (including responding
to
> > paint events).
> >
> > This happens sometimes when raytracing. The first render may go
> > perfectly fine, but eventually some subsequent render will appear to
> > freeze even though Leveller is still processing normally. Pressing
Esc
> > won't stop it but waiting for it to finish will work. The display
may
> > also show artifacts or pieces of previous displayed information.
> >
> > I suspect Vista is overly aggressive about long processes that
ignore
> > the main event loop and starts seeing them as non-responsive. But
> > putting all long processes on background threads is not something
that
> > can be implemented quickly. In the meantime, however, simply waiting
for
> > the process to end will work.
> >
> > A search on Google shows numerous other "not responding" issues for
> > Vista, but I'm not sure if there is a relationship to the problem
I'm
> > describing here.
> >
> > Ray
> >
> >
> >
>
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