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From: shackelf@tlab2.cs.unc.edu (Douglas Shackelford)
Newsgroups: comp.lang.smalltalk
Subject: Re: Help! Smalltalk-80 screen lock problem on Sun 4/470.
Message-ID: <526@borg.cs.unc.edu>
Date: 18 Jan 91 17:30:11 GMT
References: <1991Jan18.004452.29357@ucselx.sdsu.edu>
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Organization: University of North Carolina, Chapel Hill
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In article <1991Jan18.004452.29357@ucselx.sdsu.edu> whitney@saturn.sdsu.edu (Roger Whitney) writes:
>
>	I am using Smalltalk-80 v2.5 on both Macintosh computers and a 
>Sun 4/470 Sparc station running Sun OS 4.1.  While Smalltalk on the Mac
>works fine, I have a problem with it on the Sun. Smalltalk on the Sun 
>locks up the screen.  The mouse still moves around the Smalltalk window,
>but will not leave the window. Control-C and control-shift-C have no
>effect.  A far as I can determine no input from the keyboard or 
>
>roger whitney
>whitney@sdsu.edu

I have seen exactly the same problem, but only on Sun 4's.  I
have a very crude method that seems to fix the symptom, but
the problem comes back soon.  This is, at best, a last resort.

Do something like this:

	kill -STOP PID
	kill -CONT PID

where PID is the process id of the smalltalk process.  I had
to RLOGIN to the machine in order to do it.  It works for me
but as I said, the problem comes back quickly.

--Doug Shackelford
shackelf@cs.unc.edu