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Issue 1053: Transcript updates from foreground process not displayed in Transcript window

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Dale

Issue 1053: Transcript updates from foreground process not displayed in Transcript window

Ready for review:

http://code.google.com/p/pharo/issues/detail?id=1053

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Stéphane Ducasse

Re: Issue 1053: Transcript updates from foreground process not displayed in Transcript window

thanks

On Aug 10, 2009, at 3:14 AM, Dale Henrichs wrote:

> Ready for review:
>
> http://code.google.com/p/pharo/issues/detail?id=1053
>
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Stan Shepherd

Higher priority processes using ThreadSafeTranscript throw Error: Error: Instances of UndefinedObject are not indexable (was Re: Issue 1053: )

In reply to this post by Dale

Hi, if you fork processes at a higher priority, they still throw the error in issue 1053. In core 10428 I more often get Instances of UndefinedObject are not indexable. It is trying to send size to a MultiNewParagraph while it is still nil. By the time the debugger opens, the object is there.

Test case attached, although I can't get it to catch the error. Use with ***caution***. In the one click image it often freezes the image.

NSThreadsafeTranscriptPriorityTest.st

It seems like this may be the case Dale identified- "I assume that with a sufficiently complex test case, involving heavy background window updates while using some of the operations that call #displayWorldSafely a problem would be revealed, but there's no guarantee that a mutex would be the solution".

Cheers, ...Stan

Dale Henrichs wrote

Ready for review:

http://code.google.com/p/pharo/issues/detail?id=1053

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Stéphane Ducasse

Re: Higher priority processes using ThreadSafeTranscript throw Error: Error: Instances of UndefinedObject are not indexable (was Re: Issue 1053: )

Thanks
may be I should not have tried to make the Transcript threadsafe.
And may be one of these days it would be great to get a cleaner model
for morphic threading.

stef

> Hi, if you fork processes at a higher priority, they still throw the
> error in
> issue 1053. In core 10428 I more often get Instances of
> UndefinedObject are
> not indexable. It is trying to send size to a MultiNewParagraph
> while it is
> still nil. By the time the debugger opens, the object is there.
>
> Test case attached, although I can't get it to catch the error. Use
> with
> ***caution***. In the one click image it often freezes the image.
>
> http://n2.nabble.com/file/n3565757/NSThreadsafeTranscriptPriorityTest.st
> NSThreadsafeTranscriptPriorityTest.st
>
> It seems like this may be the case Dale identified- "I assume that
> with a
> sufficiently complex test case, involving heavy background window
> updates
> while using some of the operations that call #displayWorldSafely a
> problem
> would be revealed, but there's no guarantee that a mutex would be the
> solution".
>
> Cheers, ...Stan
>
>
> Dale Henrichs wrote:
>>
>> Ready for review:
>>
>> http://code.google.com/p/pharo/issues/detail?id=1053
>>
>> _______________________________________________
>> Pharo-project mailing list
>> [hidden email]
>> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
>>
>>
>
> --
> View this message in context: http://n2.nabble.com/Issue-1053-Transcript-updates-from-foreground-process-not-displayed-in-Transcript-window-tp3414861p3565757.html
> Sent from the Pharo Smalltalk mailing list archive at Nabble.com.
>
> _______________________________________________
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johnmci

Re: Higher priority processes using ThreadSafeTranscript throw Error: Error: Instances of UndefinedObject are not indexable (was Re: Issue 1053: )

In reply to this post by Stan Shepherd

On Wed, Sep 2, 2009 at 11:43 AM, Stan Shepherd <[hidden email]> wrote:

Test case attached, although I can't get it to catch the error. Use with
***caution***. In the one click image it often freezes the image.

I note for these cases where catching the error with an debug dialog seems impossible, goodness

knows we saw lots of that in Sophie via Tweak, then try something like

Smalltalk logError:'Fatal error' inContext: thisContext to: 'SqueakDebug.log'.]]

This then logs the context to a log file, for later review. For evil UI related bugs this can be of assistance.

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John M. McIntosh <[hidden email]>
Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com
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