[Newbies] Frozen Squeak environment

Peter Mucsi peter.mucsi at gmail.com
Sun Aug 5 15:13:33 UTC 2007

Hi Benjamin,

Alt-period worked well on Windows too. Basically all I wanted is not to 
lose my work if I do something silly.

Thanks a lot!


Benjamin Schroeder wrote:
> On Aug 5, 2007, at 10:03 AM, Peter Mucsi wrote:
>> Hi,
>> I'm a newbee playing around in Squeak for a while.
>> Sometimes I write code that is faulty, for example, execution gets 
>> into an infinite loop. If the loop doesn't stop after a while, the 
>> whole environment gets frozen and I have to kill Squeak in Windows 
>> XP. I have tried #forkAt (I put my stuff into a BlockClosure 
>> instance), it has solved the problem, but is there a way in Squeak to 
>> do this automatically? Can I execute something in Workspace that is 
>> put automatically into a low priority thread?
> Hi Peter,
> One thing you can do if you do get stuck in an infinite loop is to 
> press alt-. (alt-period).* This will interrupt the currently executing 
> thread. Squeak will bring up a walkback window which you can use as a 
> debugger on the stopped thread, or just close to move on.
> (I know this doesn't answer the question directly! You could make a 
> Workspace that forked things off without too much work, although there 
> isn't such a thing built in AFAIK. Check out #evaluateSelection in 
> ParagraphEditor to see where workspaces, etc., evaluate code. Of 
> course there are twisty parts: e.g., you'd then have to manage 
> stopping processes that ran too long, since they would still run in 
> the background and use up resources.)
> Hope this helps,
> Benjamin Schroeder
> * At least I think this is right. For me, on Mac, it's command-period, 
> so I think it's alt-period on XP. It could be ctrl-period if not.
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