Richard Oudkerk added the comment: On 05/09/2013 9:28am, Charles-François Natali wrote: > As a side note, in the general case, there's more than a performance > optimization: the problem with unregister() + register() vs a real > modify (e.g. EPOLL_CTL_MOD) is that it's subject to a race condition, > if an event fires during the short window where the FD isn't > registered anymore.
Even with edge-triggered notification, doesn't registering an fd check the current readiness: >>> import os, select >>> r, w = os.pipe() >>> p = select.epoll() >>> os.write(w, b"h") >>> p.register(r, select.EPOLLIN | select.EPOLLET) >>> p.poll(0) [(3, 1)] >>> p.poll(0) [] Otherwise it would be very difficult to edge-triggered notification. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue16853> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
