>>>>> "E" == Elias Karakoulakis <ek / navel.gr> writes:

E> Taking a look inside sync.rb, this particular error occurs if the 
E> blocking thread leaving a critical section doesn't hold the mutex/lock 
E> anymore!!! Any ideas?

 Well, the problem is that  you don't give enough information.

 Can you try to reproduce the error with a small script, and post this
 script. 


Guy Decoux