[issue38630] subprocess.Popen.send_signal() should poll the process

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I noticed this issue by reading subprocess code while working on bpo-38207 ("subprocess: Popen.kill() + Popen.communicate() is blocking until all processes using the pipe close the pipe") and bpo-38502 ("regrtest: use process groups").

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38630>
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