Add support for EVFILT_USER kqueue filter

[jceel]

BPO	25602
Nosy	@vstinner, @ned-deily, @william-gr
Files	0001-Add-support-for-EVFILT_USER-kqueue-filter.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2015-11-11.11:46:08.431>
labels = ['type-feature', 'library']
title = 'Add support for EVFILT_USER kqueue filter'
updated_at = <Date 2016-06-19.19:48:27.617>
user = 'https://bugs.python.org/jceel'

bugs.python.org fields:

activity = <Date 2016-06-19.19:48:27.617>
actor = 'ned.deily'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2015-11-11.11:46:08.431>
creator = 'jceel'
dependencies = []
files = ['41014']
hgrepos = []
issue_num = 25602
keywords = ['patch']
message_count = 4.0
messages = ['254485', '258208', '267558', '268865']
nosy_count = 5.0
nosy_names = ['vstinner', 'ned.deily', 'neologix', 'wg', 'jceel']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue25602'
versions = ['Python 3.6']

[jceel]

It's useful for doing signaling between threads (especially I/O-bound threads).

Related github pull request: #23

[jceel]

Hey, any news on this? I've created that issue over 2 months ago and it didn't get even commented since then.

[william-gr]

I have bumped into this issue as well.

This change would be much appreciate on my end.

What can we do to move the ball forward here?

Thanks!

[ned-deily]

Thanks for contributing the patch, Jakub. I'm sorry that there's been no action on it; unfortunately, the BSD platforms don't get as much attention here as some others. I took a cursory look at it and the patch looks pretty good to me and applies/builds cleanly on OS X (even though support for EVFILT_USER is known to not be documented there). I think it would be good to add a test case to Lib/test/test_kqueue.py. Any other opinions?