self._direct_scheduler_conn = signal_conn
        self._pickle_dags = pickle_dags
        self._dag_ids = dag_ids
        self._async_mode = async_mode
        self._parsing_start_time: int | None = None
        self._dag_directory = dag_directory
        
        
        
        #
        
        
        if self._async_mode and self._direct_scheduler_conn is not None:
            os.set_blocking(self._direct_scheduler_conn.fileno(), False)
        self.standalone_dag_processor = conf.getboolean("scheduler", "standalone_dag_processor")
        self._parallelism = conf.getint("scheduler", "parsing_processes")
        if (
            conf.get_mandatory_value("database", "sql_alchemy_conn").startswith("sqlite")
            and self._parallelism > 1
        ):
            self.log.warning(
                "Because we cannot use more than 1 thread (parsing_processes = "
                "%d) when using sqlite. So we set parallelism to 1.",
                self._parallelism,
            )
            self._parallelism = 1
        
        self._file_process_interval = conf.getint("scheduler", "min_file_process_interval")