[issue36780] Interpreter exit blocks waiting for futures of shut-down ThreadPoolExecutors

[Hrvoje Nikšić]

Hrvoje Nikšić <hniksic at gmail.com> added the comment:

@asvetlov The idea of the new flag is to disable any subsequent waiting for futures after ThreadPoolExecutor.shutdown(wait=False) returns.

Currently the additional waiting is implemented using "atexit", so I assumed it referred to process exit. (The documentation at https://docs.python.org/3/library/atexit.html doesn't seem to specify precisely when the callbacks are executed.) But looking at the implementation of atexit, it seems that the atexit callbacks are actually called from Py_FinalizeEx.

I think wait_at_exit is descriptive because in most cases the process exit and interpreter shutdown will correlate, but I can still update the docs to make it clearer what "exit" refers to. We should just avoid the word "shutdown" in the flag name to avoid confusion with executor shutdown.

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