[issue21291] subprocess Popen objects are not thread safe w.r.t. wait() and returncode being set

[Gregory P. Smith]

Gregory P. Smith added the comment:

Attaching a proposed fix for this issue.  It should make the wait() and poll() methods thread safe.  I need to turn the reproducer code into an actual test case and add more test cases for coverage of all code paths being touched.

I haven't examined the windows side of this code for the issue, it may also be useful there.

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keywords: +patch
Added file: http://bugs.python.org/file34960/issue21291-fix-gps01.diff

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