[GRASS-dev] Fixing progress bar crash in TclTk gui

[Glynn Clements]

Michael Barton wrote:

> >> There is one place that is a serious problem where we could really
> >> use a much more experienced TclTk programmer like you to sort out:
> >> the progress bar. It seems like it ought to be straightforward, but
> >> there is something wrong with the progress bar code so that if a
> >> module executes too quickly, it crashes the entire TclTk interface.
> > 
> > AFAICT, the issue is due to an event handler being re-entered through
> > the "update" command.
> > 
> > I note that ProgressBar::_modify calls update. One option is to remove
> > that call. Any other options (i.e. allowing event handlers to be
> > re-entered) are quite complex.
> 
> Now that I can compile again, I went to look for this to see if your
> suggested remedy works. I can't find where you are talking about. Is this in
> the GRASS code or in the TclTk code?

It's at the bottom of lib/external/bwidget/progressbar.tcl.

-- 
Glynn Clements <glynn at gclements.plus.com>