Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!ames!sun-barr!male!pitstop!sundc!seismo!uunet!mcvax!ukc!strath-cs!glasgow!dunlop
From: dunlop@cs.glasgow.ac.uk (Mark Dunlop)
Newsgroups: comp.sys.mac.programmer
Subject: WaitNextEvent problem
Keywords: WaitNextEvent MultiFinder SystemTask
Message-ID: <2864@crete.cs.glasgow.ac.uk>
Date: 28 Apr 89 11:30:52 GMT
Organization: Computing Sci, Glasgow Univ, Scotland
Lines: 37

I have written a small application which converts Sun rasters into PICT format.
The application does not require any NULL events, as it only does a 
conversion upon command. I thought to myself, let's be MultiFinder friendly so
I used WaitNextEvent, when I ran my program the clocks in the menu bar stopped!

I tried using SuperClock, and the Moire screensavers clock - both stopped!
Both INIT/CDEV clocks which run in the background and usually behave very well.
I then brought up a DA (under MultiFinder) selected my application and the
clock started to work again. This solution did not work by opening a background
application (e.g. Telnet).

I recon that if there is not a desk accessory running MultiFinder decides there
is no need to call SystemTask and therefor the clock stops.

I have tested the problem on two configurations...

	1M Mac Plus running MultiFinder	6.0.1
			    Finder	B1-6.1
			    System	B1-6.0.2

	4M Mac IIx running  MultiFinder	6.0.3
			    Finder	B1-6.0.3
			    System	B1-6.0.3

The call was -> WaitNextEvent(EveryEvent,TheEvent,-1,nil);

I later changed this to WaitNextEvent(EveryEvent,TheEvent,600,nil) and the clock
changed once every 10 seconds.


Any help on what's going wrong? I just tried to be MultiFinder Friendly and time
stands still....

Mark Dunlop

dunlop@cs.glasgow.ac.uk                                  dunlop@uk.ac.glasgow.cs
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