libevent - an asynchronous event library

Committed to trunk; thanks!

Looks good. I'll port it to trunk and commit.

Please see the response in libevent mail list archives:

http://monkeymail.org/archives/libevent-users/2008-May/001264.html

To be more specific about my first question: I do indeed see that the
test file generates events with EV_ET set when the backend supports
edge-triggered events and without EV_ET set when the backend doesn't
support edge-triggered events. What I'm hoping for is a unit test to
verify that the edge-triggered is in fact edge-triggered and not
level-triggered.

Neat work; I'd like to get something this into Libevent 2.0. A few
initial questions:
- How exactly does the test_et.c file test the edge-triggered behavior?
As near as I can tell,
the test ought to pass whether EV_ET works or not. What am I
missing?
- Is it really a good idea to have backends that do not support EV_ET
silently ignore it?
If writers are really hoping for edge-triggered behavior, won't they
be surprised when they
sometimes get it, and sometimes don't?

Target library version is 1.4.3-stable