[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

[Thomas Grainger]

Thomas Grainger <tagrain at gmail.com> added the comment:

the problem is multiprocessing/process is calling threading._shutdown which tries to join its own thread, because concurrent.futures.thread._threads_queues contains the main thread in the subprocess


  File "/home/graingert/miniconda3/envs/dask-distributed/lib/python3.10/multiprocessing/process.py", line 333, in _bootstrap
    threading._shutdown()
  File "/home/graingert/miniconda3/envs/dask-distributed/lib/python3.10/threading.py", line 1530, in _shutdown
    atexit_call()
  File "/home/graingert/miniconda3/envs/dask-distributed/lib/python3.10/concurrent/futures/thread.py", line 31, in _python_exit
    t.join()
  File "/home/graingert/miniconda3/envs/dask-distributed/lib/python3.10/threading.py", line 1086, in join
    raise RuntimeError("cannot join current thread")

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nosy: +graingert

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<https://bugs.python.org/issue43944>
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