Hi,
You can force an interrupt by CMD+i or CTRL+i (depending on the
platform).
Cheers,
Doru
On 20 Jan 2010, at 01:44, Viktor Kerkez wrote:
> Hi,
>
> Since this is my first post on the list, first I want to thank you
> all for the great job you're doing on Pharo :) It was a real
> revelation when I discovered it :)
>
> Now to the question:
>
> I'm reading the Pharo by Example, and came to this part:
>
> The problem with deepCopy is that it will not terminate when applied
> to a mutually recursive structure:
> a1 := { 'harry' }.
> a2 := { a1 }.
> a1 at: 1 put: a2.
> a1 deepCopy −! ... does not terminate!
>
> (Pharo actually get stuck at the step: a1 at: 1 put: a2. but that's
> not the question :) )
>
> 1. Isn't this behaviour (the complete environment get stuck and
> there is no way to unfreeze it) considered a bug? I mean the
> environment shouldn't let you shoot yourself in the foot (at least
> not so easily). Actually the same behaviour can be created just
> doing: [true] whileTrue: []...
>
> 2. Shouldn't Pharo recognize recursive structures in some way?
>
>
> I'm asking because I'm coming from a Python world, which is very
> similar to smalltalk in some manners and I'm trying to make a big
> picture comparison in my head.
>
> 1. I know that this doesn't really compares to Pharo which is a
> graphical environment, but in python you can always hit Ctrl-C and
> break the statements that block...
>
> >>> while True:
> ... pass
> ...
> ^CTraceback (most recent call last):
> File "<stdin>", line 1, in <module>
> KeyboardInterrupt
> >>>
>
> Shouldn't the UI thread always be responsive?
>
> 2. And Python recognizes recursive structures:
>
> >>> a = []
> >>> a
> []
> >>> a.append(5
> ...
> KeyboardInterrupt
> >>> a = []
> >>> a
> []
> >>> a.append(5)
> >>> a
> [5]
> >>> a.append(a)
> >>> a
> [5, [...]]
> >>> a[0]
> 5
> >>> a[1]
> [5, [...]]
> >>> a[1][1][1][1][0]
> 5
> >>>
>
>
> Don't get me wrong, I'm not trying to start a language war :) I
> wouldn't got to page 171 if I'm not really interested in Smalltalk :-
> D I'm just trying to get a clearer vision if these are some things
> that are there for some reason (design decision), or they are just
> not yet implemented, or they cannot be implemented for some other
> reasons?
>
> Thank you in advance for your time :),
> Viktor
>
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