service.py 文件源码

def wait(self):
        """Loop waiting on children to die and respawning as necessary."""

        systemd.notify_once()
        LOG.debug('Full set of CONF:')
        CONF.log_opt_values(LOG, logging.DEBUG)

        try:
            while True:
                self.handle_signal()
                self._respawn_children()
                # No signal means that stop was called.  Don't clean up here.
                if not self.sigcaught:
                    return

                signame = _signo_to_signame(self.sigcaught)
                LOG.info(_LI('Caught %s, stopping children'), signame)
                if not _is_sighup_and_daemon(self.sigcaught):
                    break

                cfg.CONF.reload_config_files()
                for service in set(
                        [wrap.service for wrap in self.children.values()]):
                    service.reset()

                for pid in self.children:
                    os.kill(pid, signal.SIGHUP)

                self.running = True
                self.sigcaught = None
        except eventlet.greenlet.GreenletExit:
            LOG.info(_LI("Wait called after thread killed. Cleaning up."))

        self.stop()