Multi-thread access to single generator

gistfile1.txt

import logging
import threading
import time
import typing


def generator():
    time.sleep(5)
    yield 123
    return 456


def in_thread_1(g: typing.Generator):
    logging.info("before send")
    g.send(None)
    logging.info("after send")


def in_thread_2(g: typing.Generator):
    time.sleep(0.1)

    logging.info("before close")
    g.close()  # ValueError: generator already executing
    logging.info("after close")


if __name__ == "__main__":
    logging.basicConfig(level=logging.DEBUG, format="%(asctime)s;%(levelname)s;%(message)s")

    gen = generator()

    thread = threading.Thread(target=in_thread_1, args=(gen,))
    thread.start()

    thread = threading.Thread(target=in_thread_2, args=(gen,))
    thread.start()