Run a single job in a child process.

        This method never returns; it always calls :func:`sys.exit`
        with an error code that says what it did.

def as_child(cls, global_config, parent=None):
        '''Run a single job in a child process.

        This method never returns; it always calls :func:`sys.exit`
        with an error code that says what it did.

        '''
        try:
            setproctitle('rejester worker')
            random.seed()  # otherwise everyone inherits the same seed
            yakonfig.set_default_config([yakonfig, dblogger, rejester],
                                        config=global_config)
            worker = cls(yakonfig.get_global_config(rejester.config_name))
            worker.register(parent=parent)
            did_work = worker.run(set_title=True)
            worker.unregister()
            if did_work:
                sys.exit(cls.EXIT_SUCCESS)
            else:
                sys.exit(cls.EXIT_BORED)
        except Exception, e:
            # There's some off chance we have logging.
            # You will be here if redis is down, for instance,
            # and the yakonfig dblogger setup runs but then
            # the get_work call fails with an exception.
            if len(logging.root.handlers) > 0:
                logger.critical('failed to do any work', exc_info=e)
            sys.exit(cls.EXIT_EXCEPTION)