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============================
Mailman queue runner control
============================
Mailman has a number of queue runners which process messages in its queue file
directories. In normal operation, a command line script called 'mailmanctl'
is used to start, stop and manage the queue runners. mailmanctl actually is
just a wrapper around the real queue runner watcher script called master.py.
>>> from mailman.testing.helpers import TestableMaster
Start the master in a sub-thread.
>>> master = TestableMaster()
>>> master.start()
There should be a process id for every qrunner that claims to be startable.
>>> from lazr.config import as_boolean
>>> startable_qrunners = [qconf for qconf in config.qrunner_configs
... if as_boolean(qconf.start)]
>>> len(list(master.qrunner_pids)) == len(startable_qrunners)
True
Now verify that all the qrunners are running.
>>> import os
# This should produce no output.
>>> for pid in master.qrunner_pids:
... os.kill(pid, 0)
Stop the master process, which should also kill (and not restart) the child
queue runner processes.
>>> master.stop()
None of the children are running now.
>>> import errno
>>> for pid in master.qrunner_pids:
... try:
... os.kill(pid, 0)
... print 'Process did not exit:', pid
... except OSError, error:
... if error.errno == errno.ESRCH:
... # The child process exited.
... pass
... else:
... raise
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