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Thanks.  There are two particular areas for extra 
attention.  

First, should the waiter acquire/release pairs be in a 
try/finally (iow, is there some behavior in notify() or 
release() that potentially needs to be trapped)?

Second, should the notify() in task_done() really be a 
notifyAll() (iow, does it make sense that multiple joins 
may be pending)?

Thanks again.