kqueue

Hi,

On the WaitEventSet thread I posted a small patch to add kqueue
support[1].  Since then I peeked at how some other software[2]
interacts with kqueue and discovered that there are platforms
including NetBSD where kevent.udata is an intptr_t instead of a void
*.  Here's a version which should compile there.  Would any NetBSD
user be interested in testing this?  (An alternative would be to make
configure to test for this with some kind of AC_COMPILE_IFELSE
incantation but the steamroller cast is simpler.)

[1] http://www.postgresql.org/message-id/CAEepm=1dZ_mC+V3YtB79zf27280nign8MKOLxy2FKhvc1RzN=g@mail.gmail.com
[2] https://github.com/libevent/libevent/commit/5602e451ce872d7d60c640590113c5a81c3fc389

--
Thomas Munro
http://www.enterprisedb.com