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Message: [QUOTE="nik, post: 2937100"] Hi, How can I close a thread that is waiting on a file/port down gracefully, and not have an IO error pop up? I am having trouble closing a thread that is listening to the serial port. I have a thread that calls uses a pySerial serial port and calls readline() without a timeout, which is blocking. When I am shutting down the application I close the serial port, which causes the IO error: (9, 'Bad file descriptor'). It makes sense that we would get this error, because it is trying to read off of a closed 'file'. Is there a better way to close this thread and port down? Thanks, Nik [/QUOTE]