server.py 文件源码

def launch(self):
        self.check()

        received = False

        def set_received(*_):
            nonlocal received
            received = True

        signal.signal(signal.SIGUSR1, set_received)
        pid = self.fork_zeo()
        if not received:
            while not signal.sigtimedwait([signal.SIGUSR1], 1):
                pid, waitres = os.waitpid(pid, os.WNOHANG)
                if pid:
                    log.error('Database server failed to start (check log above).')
                    sys.exit(1)

        settings.DB_URI = urlunsplit(('zeo', '', self.zeo_path, '', ''))
        log.debug('Launched built-in ZEO')
        return pid