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How to use development tools with a "consumer application VM image"

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Michael Vorburger-2

How to use development tools with a "consumer application VM image"

Hello Squeakers!

How do you "peek" into it a Squeak image like the one Scratch
distributes, so to see and learn from the Scratch classes and methods
etc. and "hack" (in the best sense of the word) it?

My understanding is that such an image is made "consumer friendly"
(what's the term you use for doing things like what's described on
http://squeak.preeminent.org/tut2007/html/205.html ?), so when the VM
starts, it immediately shows that "application" only, right-clicks are
overloaded, and one can not access e.g. a Browser, Workspace etc.
development tools anymore, if they even are still part of this kind of
images.

I am curious how Smalltalk/Squeak handles this issue that probably
isn't new to many of you on the list. Can one either "load" (parts of)
an image into a running "full/normal" image which has development
tools, or can I add back those tools to such an image externally
somehow? Surely that is not impossible, no image presumably can
effectively completely "lock out" development, or can it?

Thanks a lot,
Michael
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Peter Mucsi

Frozen Squeak environment

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?

Thanks in advance for your kind answer.

Peter Mucsi
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Benjamin Schroeder-2

Re: Frozen Squeak environment

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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Peter Mucsi

Re: Frozen Squeak environment

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!

Regards,
Peter

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.
>
> _______________________________________________
> Beginners mailing list
> [hidden email]
> http://lists.squeakfoundation.org/mailman/listinfo/beginners
>

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Jens Lincke

Re: How to use development tools with a "consumer application VM image"

In reply to this post by Michael Vorburger-2

Michael Vorburger schrieb:
> How do you "peek" into it a Squeak image like the one Scratch
> distributes, so to see and learn from the Scratch classes and methods
> etc. and "hack" (in the best sense of the word) it?
>
>
try to break something and get a debugger, this worked for me with
beta-versions of scratch under linux in which the dev tools were not
stripped out

- Jens -

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