Run the given function in an independent python interpreter.

def run_with_reloader(main_func, extra_files=None, interval=1, reloader_type="auto"):
    """Run the given function in an independent python interpreter."""
    import signal

    reloader = reloader_loops[reloader_type](extra_files, interval)
    signal.signal(signal.SIGTERM, lambda *args: sys.exit(0))
    try:
        if os.environ.get("WERKZEUG_RUN_MAIN") == "true":
            ensure_echo_on()
            t = threading.Thread(target=main_func, args=())
            t.setDaemon(True)
            t.start()
            reloader.run()
        else:
            sys.exit(reloader.restart_with_reloader())
    except KeyboardInterrupt:
        pass