Path: utzoo!attcan!uunet!pdn!kevin
From: kevin@pdn.UUCP (Kevin Baughman)
Newsgroups: comp.lang.smalltalk
Subject: Re: Apparent bug, help sought
Message-ID: <3148@pdn.UUCP>
Date: 17 May 88 12:19:48 GMT
References: <1338@its63b.ed.ac.uk>
Reply-To: kevin@pdn.UUCP (0000-Kevin Baughman)
Organization: Paradyne Corporation, Largo, Florida
Lines: 25

In article <1338@its63b.ed.ac.uk> csrdi@itspna.ed.ac.uk (Rick Innis) writes:
>I'm implementing a simulation system with a graphics interface as part of my
>fourth year project.
>Whenever the browser tries sending a message to its instance of
>SimulationOrganiser, it fails with the error:
>'UndefinedObject>>doesNotUnderstand:' (whatever the message happened to be).
>Okay, so the instance of SimulationOrganiser is an UndefinedObject.
>But according to the debugger, it's 'a SimulationOrganiser'. 

Whenever this has happened to me (in Smalltalk-80), it has always
been caused by a background process not finishing its initialization
before the foreground process gets control.  Then, before entering
the debugger, the backgound process gets its timeslice and changes
the environment.

Seeing how you're doing simulations (which implies to me multiple
concurrent processes) then that might be your problem.

Good luck!

-- 
Kevin Baughman                              Paradyne Corporation
{gatech,codas,ucf-cs}!usfvax2!pdn!kevin     Mail stop LF-207
Phone: (813) 530-8395                       P.O. Box 2826
                                            Largo, FL  34649-2826