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selectors: Make sure EpollSelecrtor.select() works when no FD is registered.

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Closes issue #23009.
This commit is contained in:
Yury Selivanov 2014-12-08 12:21:58 -05:00
parent e3b743cd3e
commit d60ef4aa9d
2 changed files with 11 additions and 1 deletions
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7
Lib/selectors.py
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@ -418,7 +418,12 @@ if hasattr(select, 'epoll'):
# epoll_wait() has a resolution of 1 millisecond, round away
# from zero to wait *at least* timeout seconds.
timeout = math.ceil(timeout * 1e3) * 1e-3
max_ev = len(self._fd_to_key)
# epoll_wait() expectcs `maxevents` to be greater than zero;
# we want to make sure that `select()` can be called when no
# FD is registered.
max_ev = max(len(self._fd_to_key), 1)
ready = []
try:
fd_event_list = self._epoll.poll(timeout, max_ev)