[issue41456] loop.run_in_executor creat thread but not destory it after the task run over

[Guo Xiyong]

New submission from Guo Xiyong <beijiu...@gmail.com>:

code like this:

import asyncio

import time

import threading


def sync_test():
    time.sleep(1)

async def run_test():
    loop = asyncio.get_event_loop()

    for _ in range(10):
    #     r = await loop.getaddrinfo('wq.io', 443)
    #     print(r)

        loop.run_in_executor(None, sync_test)

    for t in threading.enumerate():
        print(t)


    while True:
        await asyncio.sleep(1)


asyncio.run(run_test())


after run, the 10 thread will always exist

----------
components: asyncio
messages: 374679
nosy: asvetlov, cielpy, yselivanov
priority: normal
severity: normal
status: open
title: loop.run_in_executor creat thread but not destory it after the task run 
over
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41456>
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