[issue39812] Avoid daemon threads in concurrent.futures

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

@Jan, without taking a look, I'd answer that indeed you should avoid using the "fork" method if you're doing any kind of multithreading in the parent process.  "forkserver" is a good choice nowadays on Linux and will result in more robust code.

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<https://bugs.python.org/issue39812>
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