[PYTHONMAC-SIG] apps freeze unless they print!

[Steven D. Majewski]

On Sun, 18 May 1997, Joseph J. Strout wrote:

> I'm suddenly finding that Python locks up under the following conditions: I
> have a program in a loop which is working very hard (or snoozing) for a
> long time without printing anything to the console window (sample code
> below); I switch to the Finder or any other app; then I switch back --
> presto, it's frozen.  By "frozen" I mean that the window is not refreshed,
> I can't move it, and I can't switch back to the Finder or any other app; I
> have to hit command-period or kill the Python process.
> 
> Perhaps the Mac guts are only being updated whenever the console window is
> updated.  But I don't really want to clutter up my nice log window with
> useless garbage (and system.out.write('') doesn't work either, I tried
> it!).  Is there any other way to trigger the Mac event-handling parts?
> 


Add the following line to the loop (plus an import MacOS, Evt somewhere):

	MacOS.HandleEvent(Evt.GetNextEvent(-1)[1])


You get a delay on the screen update from the sleep. 
I'm not sure why you get the lockup in the first place, but I 
sometimes see the event effects get done right after I command-dot
out, so I expect it has something to do with the event queue. 


---|  Steven D. Majewski   (804-982-0831)  <sdm7g@Virginia.EDU>  |---
---|  Department of Molecular Physiology and Biological Physics  |---
---|  University of Virginia             Health Sciences Center  |---
---|  P.O. Box 10011            Charlottesville, VA  22906-0011  |---
         By doing just a little every day, you can gradually 
                let the task completely overwhelm you.


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