EXPERIMENTAL: tevent_kqueue support

[Stefan (metze) Metzmacher]

Hi Jeremy,

>>>>> I've started with a tevent_kqueue implementation
>>>>> (just looking at the man page).
>>>>>
>>>>> It compiles for me on linux with the 2nd HACK patch.
>>>>>
>>>>> Can you have a look and test it?
>>>>>
>>>>> @Jeremy: we may want to pick up some of the simplified logic into the
>>>>> epoll backend:
>>>>>          kqueue_update_fd_event() instead of
>>>>>          epoll_add_event/epoll_mod_event/epoll_del_event/epoll_change_event.
>>>>
>>>> Don't think that will work. The difference between epoll/kqueue
>>>> is that kqueue doesn't seem to have the restriction on adding
>>>> 2 events with the same fd, which means we'd have to migrate
>>>> all the logic in my epoll patch into a epoll_update_fd_event
>>>> function, which might get rather messy :-).
>>>
>>> We already had a epoll_change_event(), which I renamed to
>>> epoll_update_event()
>>> and used in all places instead of using epoll_{add,mod,del}_event directly.
>>>
>>> I current epoll patchset is attached, please take a look, but don't push
>>> it to master yet.
>>
>> Ok, I'll run under test and wait for you to confirm you're
>> happy.
> 
> Finally got time to look at this. Needs this additional
> patch to compile (but I'm sure you already knew that :-).

Yes :-)

I spend the last days, fixing some bugs that made autobuild unstable
when we use the poll backend. (About 30-40 private autobuilds...)

My current work in progress is available under
https://gitweb.samba.org/?p=metze/samba/wip.git;a=shortlog;h=refs/heads/master3-tevent2
and
https://gitweb.samba.org/?p=metze/samba/wip.git;a=shortlog;h=refs/heads/master4-tevent2

I'll try to add some more tests which test the specific behaviors
regarding triggered events,
e.g. that an event without flags and remaining bytes in the socket
doesn't cause
a 100% cpu loop and similar things.

metze

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