How to pass and run a callback method in Python

Question

I have a Manager (main thread), that creates other Threads to handle various operations. I would like my Manager to be notified when a Thread it created ends (when run() met

Answer 1

If you want the main thread to wait for children threads to finish execution, you are probably better off using some kind of synchronization mechanism. If simply being notified when one or more threads has finished executing, a Condition is enough:

import threading

class MyThread(threading.Thread):
    def __init__(self, condition):
        threading.Thread.__init__(self)
        self.condition = condition

    def run(self):
        print "%s done" % threading.current_thread()
        with self.condition:
            self.condition.notify()


condition = threading.Condition()
condition.acquire()

thread = MyThread(condition)
thread.start()

condition.wait()

However, using a Queue is probably better, as it makes handling multiple worker threads a bit easier.