Python-daemon doesn't kill its kids
- by Brian M. Hunt
When using python-daemon, I'm creating subprocesses likeso:
import multiprocessing
class Worker(multiprocessing.Process):
def __init__(self, queue):
self.queue = queue # we wait for things from this in Worker.run()
...
q = multiprocessing.Queue()
with daemon.DaemonContext():
for i in xrange(3):
Worker(q)
while True: # let the Workers do their thing
q.put(_something_we_wait_for())
When I kill the parent daemonic process (i.e. not a Worker) with a Ctrl-C or SIGTERM, etc., the children don't die. How does one kill the kids?
My first thought is to use atexit to kill all the workers, likeso:
with daemon.DaemonContext():
workers = list()
for i in xrange(3):
workers.append(Worker(q))
@atexit.register
def kill_the_children():
for w in workers:
w.terminate()
while True: # let the Workers do their thing
q.put(_something_we_wait_for())
However, the children of daemons are tricky things to handle, and I'd be obliged for thoughts and input on how this ought to be done.
Thank you.
