Fixed race condition in producer Flush() operation #229
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Motivation
There is a race condition that make
Producer.Flush()to get stuck.The flush operation works by attaching itself as a callback on the last item in the pending messages queue. Once the (current) last message in the queue is published, then flush is completed.
The problem is that we check the last item in queue and then we grab a mutex and add the flush request. If the the pending item is completed before we grab the mutex, then the flush callback will never be called.