Path: utzoo!dptcdc!jarvis.csri.toronto.edu!mailrus!purdue!mentor.cc.purdue.edu!pur-ee!pur-phy!sho
From: sho@pur-phy (Sho Kuwamoto)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Flickering cursor
Message-ID: <2153@pur-phy>
Date: 18 Apr 89 15:59:43 GMT
References: <5522@microsoft.UUCP>
Reply-To: sho@newton.physics.purdue.edu.UUCP (Sho Kuwamoto)
Organization: Purdue Univ. Physics Dept., W. Lafayette, IN
Lines: 23

In article <5522@microsoft.UUCP>t-stephp@microsoft.UUCP (Stephen Poole) writes:
<I'm working on an LSC program that is very calculation intensive.  My
<event loop checks for the usual events and after processing any makes
<a call to my calculation routine.  This routine takes a small fraction
<of a second (typically about .1 - .2, I'd guess)[...]

<The problem is that my mouse cursor flickers horribly.  [...]
<It seems to me that the problem is just because I'm not calling
<WaitNextEvent frequently enough, but it will take some serious 
<rewriting to check for events between every calculation instead of
<between groups of calculations.

<Am I correctly assessing the problem?  Is there some general guideline
<about how frequently GetNextEvent must be called?  Thanks for any help.

I doubt this is the problem.  The mouse is redrawn at interrupt time,
not on a Get/Wait NextEvent.  I may be missing the obvious, but unless
you install some ruthless VBL tasks, there should be no reason for
the mouse cursor to flicker.  I'd check for a more serious error
if I were you.  Sometimes bugs on the mac create completely arbitrary
symptoms.

-Sho