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    <p>As a commenter already mentioned, you can't use <code>join()</code> because all that does is wait for the thread to terminate naturally. I'm not aware of any native Python API to forcibly kill a thread, although the underlying threading libraries will typically have one (e.g. <code>pthread_kill()</code>). This is generally because forcibly killing a thread in Python is generally a pretty bad thing to do.</p> <p>In this case, however, it doesn't appear you're trying to kill an uncooperative thread, you've signalled to the thread that you want it to terminate gracefully (by setting your <code>running</code> attribute).</p> <p>I don't see any reason why you can't just set <code>thread</code> to <code>None</code> straight away - I don't believe that removing the last reference to the thread object will actually cause any problems as the thread will be kept alive until it terminates (unless you've set <code>daemon</code> to <code>True</code> on it and the main program terminates). Of course, any objects that are in the closure created when you define the <code>worker()</code> function will still exist, so they won't be freed until the thread terminates (and possibly not even then the way that closure is set up - I'd need to think about that more carefully).</p> <p>Anyway, I think your life will be easier if you just arrange to <code>join()</code> with the thread when it terminates. If your concern is that you will have to wait for your thread's period to time out, you can use a <code>threading.Condition</code> object to get around that:</p> <pre><code>class CoolThing(object): def __init__(self): self.thread = None self.exit_condition = threading.Condition() def run_in_background(self, callback, period=0.5): if self.thread: raise RuntimeError def worker(exit_condition): exit_condition.acquire() worker.running = True while worker.running: if some_event(): callback(self) exit_condition.wait(period) exit_condition.release() self.thread = (threading.Thread(target=worker, args=(self.exit_condition,)), worker) self.thread[0].start() def stop_background(self): if not self.thread: raise RuntimeError # Make the worker function end harmfully. self.exit_condition.acquire() self.thread[1].running = False self.exit_condition.notify() self.exit_condition.release() self.thread[0].join() self.thread = None </code></pre>
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    1. POWhat to do with thread being about to terminate?
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