[docs] [issue19809] Doc: subprocess should warn uses on race conditions when multiple threads spawn child processes

[Leonardo Santagada]

Leonardo Santagada <santagada at gmail.com> added the comment:

This is still the case on windows as the pipes created to talk to the process might be inherited by two or more simultaneous CreateProcess calls.

I've found a suggested solution to this:

https://devblogs.microsoft.com/oldnewthing/20111216-00/?p=8873

By only inheriting the stdout/err/in handles and them supporting close_fds for windows.

Would more users be interested in a proper patch for this? For us now we have a lock around Popen.__init__ but that obviously doesn't suport subinterpreters and other calls to CreateProcess that might happen.

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nosy: +santagada
versions: +Python 3.6, Python 3.7, Python 3.8, Python 3.9

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