Thread safety and nethod handle chains

[Rémi Forax]

On 08/11/2011 11:39 PM, Mark Roos wrote:
> As I start to look at the multithreading aspects of the Smalltalk 
> implementation I can see a situation where
> two threads could be running down the GWT lookup path both looking for 
> the same implementation.  I was
> thinking of making the lookup synchronized but then what if two 
> threads are in the GWT pipeline looking for the
> same implementation.  One gets to the lookup first and finds the 
> method.  Now is it possible that the second thread
> had entered the call site but is suspended between the site and the 
> lookup?  In that case the lookup will have been
> done but the second thread has passed the GWT for it (its added to the 
> start).
>
> I am thinking that I may just accept the fact that there could be 
> duplicate GWTs in the chain.  Or is there a better
> approach?

Yes, you can have duplicate GWTs and
I'm also interested if someone find a better approach :)

>
> Thanks
>
> mark

cheers,
Rémi

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