[issue1191964] asynchronous Subprocess

[Josiah Carlson]

Josiah Carlson added the comment:

All of the standard tests plus another few that I added all pass on Windows and Linux. I've got some cleanup and a couple more tests to add tomorrow, then I'll post a patch.

I ended up not using any overlapped IO cancellation in the Windows variant of communicate(), as there is no benefit to doing so, and the function is as re-entrant as the original.

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<http://bugs.python.org/issue1191964>
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