Am 27.08.2006 um 06:50 schrieb Michael van der Gulik:

> Bert Freudenberg wrote:
>> Michael van der Gulik schrieb:
>>> Bert Freudenberg wrote:
>>>
>>>> Michael van der Gulik schrieb:
>>>
>>> I'd like to confirm that my approach indeed doesn't work, even if
>>> I stick a 'Smalltalk garbageCollect' in the middle of it. Argh.
>> You should try to trace the non-GCed instance of TestPoller. My  
>> guess would be that it is still referenced by the #startPolling:  
>> method context which is referenced by the process that executes  
>> the block you forked.
>
> You are right. In fact, the strong reference was sitting right  
> there in front of me as a method parameter (/me slaps forehead).
>
> For completeness, a working version of the code is attached.

Well, this line

	((w at: 1) isNil) ifTrue: [keepPolling := false] ifFalse: [ (w at:  
1) poll ].

is incorrect - a GC might well happen between the #isNil check and  
the #poll send, so the weak ref might have become nil by the time you  
send #poll.

- Bert -