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* Replace pipe-based notification with EVFILT_USER where possibleNick Mathewson2012-04-111-0/+39
Sufficiently recent kqueue implementations have an EVFILT_USER filter that we can use to wake up an event base from another thread. When it's supported, we now use this mechanism rather than our old (pipe-based) mechanism. This should save some time and complications on newer OSX and freebsds.