Thread safety and nethod handle chains

[Mark Roos]

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?

Thanks

mark

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