If there is the possibility that the same thread had acquired the lock earlier, you should use an RLock instead.
Gabriel, Thanks for the great hint. I didn't find RLock in my initial reading. So as I read up on RLock, I did a quick search on vlock. It turns out that I was using vlock as a variable and it is also a lock that wasn't in my initial reading. So I changed the variable name and the threads started working properly. Thanks! Teresa
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