threading and multiprocessing deadlock

[Dieter Maurer]

Johannes Bauer wrote at 2021-12-6 00:50 +0100:
>I'm a bit confused. In my scenario I a mixing threading with
>multiprocessing. Threading by itself would be nice, but for GIL reasons
>I need both, unfortunately. I've encountered a weird situation in which
>multiprocessing Process()es which are started in a new thread don't
>actually start and so they deadlock on join.

The `multiprocessing` doc
(--> "https://docs.python.org/3/library/multiprocessing.html#module-multiprocessing")
has the following warning:
"Note that safely forking a multithreaded process is problematic."

Thus, if you use the `fork` method to start processes, some
surprises are to be expected.