workerman 4.0.8版本 在nfs文件系统下的问题

    protected static function lock()
    {
        $fd = \fopen(static::$_startFile, 'r');
        if ($fd && !flock($fd, LOCK_EX)) {
            static::log('Workerman['.static::$_startFile.'] already running.');
            exit;
        }
    }