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53a07fe2
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2010-09-17T00:34:13
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Replace pipe-based notification with EVFILT_USER where possible
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.
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