[issue41539] print blocks with multiprocessing and buffered output

[Martin]

Martin <martin.schroeder at nerdluecht.de> added the comment:

Yes, I think it should at least be documented.

But then it practically says: "Do not use print in your library because it might be used in a threading context" This sounds unacceptable to me. 

It would be great to "just make it work".

> I debugged it a bit and I think the race may be between your print statement and the util._flush_std_streams()

Why would print deadlock with a flush?

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<https://bugs.python.org/issue41539>
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