benoitc b0c0333248 unblock the wait loop under python 3.5
in python 3.5 the select is blocking when waiting for it which prevent quick
exit on SIGTERM.

The problem is described:
https://www.python.org/dev/peps/pep-0475/#backward-compatibility

This change fix it by listening for signal event on the worker pipe. Once an
event is triggered it will forcefully wake up the select and return.

fix #1256
2016-05-10 09:08:17 +02:00
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