join

join

  join(timeout=None)

  Wait until the thread terminates. This blocks the calling thread until the thread whose join() method is called terminates – either normally or through an unhandled exception – or until the optional timeout occurs.

  When the timeout argument is present and not None, it should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). As join() always returns None, you must callis_alive() after join() to decide whether a timeout happened – if the thread is still alive, the join() call timed out.

  When the timeout argument is not present or None, the operation will block until the thread terminates.

  A thread can be join()ed many times.

  join() raises a RuntimeError if an attempt is made to join the current thread as that would cause a deadlock. It is also an error to join() a thread before it has been started and attempts to do so raises the same exception.

原文地址:https://www.cnblogs.com/tekkaman/p/5593394.html