How to use the uvicorn.subprocess.get_subprocess function in uvicorn

def startup(self):
        message = "Started parent process [{}]".format(str(self.pid))
        color_message = "Started parent process [{}]".format(
            click.style(str(self.pid), fg="cyan", bold=True)
        )
        logger.info(message, extra={"color_message": color_message})

        for sig in HANDLED_SIGNALS:
            signal.signal(sig, self.signal_handler)

        for idx in range(self.config.workers):
            process = get_subprocess(
                config=self.config, target=self.target, sockets=self.sockets
            )
            process.start()
            self.processes.append(process)

def restart(self):
        self.mtimes = {}
        os.kill(self.process.pid, signal.SIGTERM)
        self.process.join()

        self.process = get_subprocess(
            config=self.config, target=self.target, sockets=self.sockets
        )
        self.process.start()

def startup(self):
        message = "Started reloader process [{}]".format(str(self.pid))
        color_message = "Started reloader process [{}]".format(
            click.style(str(self.pid), fg="cyan", bold=True)
        )
        logger.info(message, extra={"color_message": color_message})

        for sig in HANDLED_SIGNALS:
            signal.signal(sig, self.signal_handler)

        self.process = get_subprocess(
            config=self.config, target=self.target, sockets=self.sockets
        )
        self.process.start()