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    <p>Your options are a bit limited. If doing <code>self.daemon = True</code> in the constructor for the <code>Worker</code> class does not solve your problem and trying to catch signals in the Parent (ie, <code>SIGTERM, SIGINT</code>) doesn't work, you may have to try the opposite solution - instead of having the parent kill the children, you can have the children commit suicide when the parent dies.</p> <p>The first step is to give the constructor to <code>Worker</code> the <code>PID</code> of the parent process (you can do this with <code>os.getpid()</code>). Then, instead of just doing <code>self.queue.get()</code> in the worker loop, do something like this:</p> <pre><code>waiting = True while waiting: # see if Parent is at home if os.getppid() != self.parentPID: # woe is me! My Parent has died! sys.exit() # or whatever you want to do to quit the Worker process try: # I picked the timeout randomly; use what works data = self.queue.get(block=False, timeout=0.1) waiting = False except queue.Queue.Empty: continue # try again # now do stuff with data </code></pre> <p>The solution above checks to see if the parent PID is different than what it originally was (that is, if the child process was adopted by <code>init</code> or <code>lauchd</code> because the parent died) - see <a href="http://www.mail-archive.com/cocoa-dev@lists.apple.com/msg55718.html" rel="nofollow noreferrer">reference</a>. However, if that doesn't work for some reason you can replace it with the following function (adapted from <a href="https://stackoverflow.com/questions/568271/check-if-pid-is-not-in-use-in-python">here</a>):</p> <pre><code>def parentIsAlive(self): try: # try to call Parent os.kill(self.parentPID, 0) except OSError: # *beeep* oh no! The phone's disconnected! return False else: # *ring* Hi mom! return True </code></pre> <p>Now, when the Parent dies (for whatever reason), the child Workers will spontaneously drop like flies - just as you wanted, you daemon! <code>:-D</code></p>
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    1. COClever solution & great explanation!
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    2. COI really would like to give you more than 1 point for this answer :D
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