During the closure process of the underlying CFStream (or when the CF is internally unscheduled), there is a problem where the same stream is repeatedly closed/unscheduled by different threads/objects, and the internal state of the CF is disrupted.

During the closure process of the underlying CFStream (or when the CF is internally unscheduled), there is a problem where the same stream is repeatedly closed/unscheduled by different threads/objects, and the internal state of the CF is disrupted. #381