EXPERIMENTAL: tevent_kqueue support

Stefan (metze) Metzmacher metze at samba.org
Wed Feb 27 10:39:15 MST 2013

Am 27.02.2013 17:58, schrieb Jeremy Allison:
> On Wed, Feb 27, 2013 at 07:02:43AM +0100, Stefan (metze) Metzmacher wrote:
>> Am 26.02.2013 22:44, schrieb Jeremy Allison:
>>> On Tue, Feb 26, 2013 at 01:35:58PM -0800, Jeremy Allison wrote:
>>>> That code was already written carefully to do exactly what
>>>> it does :-).
>>>> Without using threads it's really easy to get yourself
>>>> blocked on a pipe. I'll have to do more testing to see
>>>> if it's true that writable is cleared when a pipe is
>>>> full.
>>> Yep. Just confirmed with junk code. poll returns
>>> writable on a pipe fd even if writing to such a
>>> pipe would block.
>>> That means that for this test we can't always
>>> prioritize writes over reads, as we just end
>>> up blocked in the callback. That's why the
>>> callback code is written as it is, I'm
>>> assuming a pipe can hold 256 btyes without
>>> blocking.
>> If we get POLLOUT without being able to write 1 byte
>> without blocking, we have a problem.
>> That's the whole point of having POLLOUT at all...
>> Can you post your junkcode example?
> As I mentioned later, I had a bug :-).
> Got it working now. I'll re-do the test patch
> to work without the hack and re-post it.
> You can then rebase it on top of the merged
> patchset.

I have a specific test for the full buffer thing now...


It generates the attached strace output, which shows that all backends
behave the same.

Maybe it would be better to have the test with 2 events
as a separate test instead of modifying the existing one?

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