Prevent Interruption During Queue Shutdown #4644
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Currently the finalizers in
ZQueueare uninterruptible but we could be interrupted between setting the shutdown flag and running the finalizers, which leaves us in a somewhat undefined state where the queue says it has been shutdown but actually hasn't been shutdown yet. We can move theuninterruptiblearound the outer scope to ensure that if the shutdown flag is set the finalization logic will run as well.