Re: stklos problem: stack corruption with scale and canvas

From: Mark Montague <>
Date: Thu, 06 Jun 2002 17:55:57 -0700

Looking further at this problem, I was able to reproduce it by making
the callback for the "scale.stk" demo exhibit the problem as well:

I just added some time-consuming trig to the callback:

--- scale.stk Thu Jun 6 15:26:46 2002
+++ Examples/scale.stk Sun Jun 2 17:49:25 2002
_at_@ -46,7 +46,7 @@
                            :value 120
                            :command (lambda (e)
                                       (format #t "horizontal: ~S\n"
- (sin (exp (cos (exp ((value (event-widget e)))))))))))
+ (value (event-widget e))))))
          (vs (make <scale> :orientation 'vertical
                            :parent win
                            :height 300

It looks like when callbacks take too long as events are coming in
quickly, there is some sort of race condition on the stack that
corrupts the arguments.

                                - M

Mark "Monty" Montague |  | I don't do Windows(tm)
If a tree falls when there's no one observing, does its wave function collapse?
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Received on Fri Jun 07 2002 - 02:56:29 CEST

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