Re: [Rd] misbehaviour of some tk windows, R 2.6.0 on SUSE 10.1?

From: John Fox <jfox_at_mcmaster.ca>
Date: Tue, 9 Oct 2007 22:07:06 -0400


Dear Peter and David,

For what it's worth, I observe this behaviour after upgrading to R 2.6.0 under Ubuntu 7.04. When David previously reported the problem to me, I tested on R 2.5.1 (again with Ubuntu 7.04) and did not observe the problem.

Regards,
 John

> -----Original Message-----
> From: r-devel-bounces_at_r-project.org
> [mailto:r-devel-bounces_at_r-project.org] On Behalf Of Peter Dalgaard
> Sent: Tuesday, October 09, 2007 4:32 PM
> To: David Firth
> Cc: r-devel_at_stat.math.ethz.ch
> Subject: Re: [Rd] misbehaviour of some tk windows, R 2.6.0 on
> SUSE 10.1?

>
> Peter Dalgaard wrote:
> > David Firth wrote:
> >
> >> I don't know whether this is specific to (my installation
> >> of) SUSE 10.1, or is more general.
> >>
> >> With R 2.6.0, I am finding that some widgets made through
> the tcltk
> >> package are having problems which become evident through scrollbar
> >> activity. An example is demo(tkfaq) -- see below. To
> reproduce the
> >> problem, I do the following:
> >> after the tk window appears, hold down the "scroll-down"
> >> tab at the foot of the window for a few seconds, then release. If
> >> scrolling stops (as it should, if all is working
> correctly), do the
> >> same thing again. Repeating this 2 or 3 times usually results in
> >> uncontrolled
> >> (unstoppable) scrolling activity; and closing the window when that
> >> happens delivers the errors that appear in the transcript below.
> >>
> >> My R 2.6.0 was built on my own system,
> >>
> >> OS: SUSE linux 10.1
> >> tcl: 8.4.12-14
> >> tk: 8.4.12-14
> >> gcc: 4.1.0-25
> >>
> >> Since I had not seen this behaviour with previous versions of R, I
> >> did a check with R 2.5.1: a fresh build today of R
> >> 2.5.1 on the same system does not appear to have the same problem.
> >>
> >> Any ideas? Is anyone else seeing this behaviour?
> >>
> >> David
> >>
> >>
> >
> > Looks a bit nasty. I see it on SUSE 10.2 as well. Increasing the
> > repeatinterval setting for the scrollbar helps, but even at
> a setting
> > of 50, I still see the effect. It is usually stoppable with
> the middle
> > button over the trough.
> > The error message is what you'd expect from killing a window while
> > something is trying to talk to widgets inside of it. The details of
> > the popup dialog is a little more informative:
> >
> > while executing
> > "$w cget -repeatinterval"
> > (procedure "tk::ScrollSelect" line 12)
> > invoked from within
> > "tk::ScrollSelect .3.2 arrow2 again"
> > ("after" script)
> >
> > I think there's a clue in there. It has the hallmarks of a race
> > condition: As I understand it the autorepeat feature runs an "after"
> > script which effectively presses the arrow again 5 ms
> later, invoking
> > another "after" script, etc. A button release is supposed
> to kill the
> > after script, but it might not do so in time, in which case
> it may try
> > to kill something that already died, etc.
> >
> > Can't offhand see that we did anything to the event loop that could
> > cause this, though.
> >
> Exactly the same behaviour on Fedora 7. Looping scrolling
> with 2.6.0+, no probs with 2.5.1.
>
> Can probably eliminate OS issues and hardware then (2x3.2GHz,
> 64 bit SUSE vs. 600MHz, 32bit Fedora). Argh....
>
> --
> O__ ---- Peter Dalgaard ุster Farimagsgade 5, Entr.B
> c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
> (*) \(*) -- University of Copenhagen Denmark Ph:
> (+45) 35327918

> ~~~~~~~~~~ - (p.dalgaard_at_biostat.ku.dk) FAX:
> (+45) 35327907
>
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