[issue45021] Race condition in thread.py

[nullptr]

nullptr <xavier.lacr...@gmail.com> added the comment:

Simplifying the reproducing example a bit more:


from concurrent.futures import ProcessPoolExecutor, ThreadPoolExecutor
from time import sleep

def submit(pool):
    pool.submit(submit, pool)


if __name__ == '__main__':
    pool = ThreadPoolExecutor(1)
    pool.submit(submit, pool)

    while True:
        with ProcessPoolExecutor() as workers:
            print('WORK')
            workers.submit(sleep, 0.01).result()
            print('DONE')
        print('OK')

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<https://bugs.python.org/issue45021>
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