ChangBo Guo(gcb) dd0ab650c8 Adjust doc about threading
There are two ways to give other greenthread chance to run:
greenthread.sleep(0) or time.sleep(0). Add the second way in
threading.rst and recommend the first way for contributors.

Also, PyMySQL works well with eventlet [1], and it's the default MySQL
DB API driver for oslo.db now[2].
So adjust 'threading model' doc with such info.

[1] https://wiki.openstack.org/wiki/PyMySQL_evaluation
[2] http://docs.openstack.org/developer/oslo.db/installation.html

Change-Id: I1fcf7242a6794d74da16aa5f326887cfa7257a1b
2016-10-14 13:07:47 +08:00
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2016-10-14 13:07:47 +08:00
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