I write a subprcess patch for gevent, see https://gist.github.com/2785610.
the test passed in gevent 1.0b1, however, failed in gevent 1.0b2.
then I review the code I found that in gevent 1.0b1, after children process
dead, it will return 0, but return None in gevent 1.0b2.
so...what's different between 1.0b1 and 1.0b2?
A simple coder.
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