Provide wrapper for eventfd

[tiran]

BPO	41001
Nosy	@tiran
PRs	bpo-41001: Add os.eventfd() #20930

^{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 = <Date 2020-11-13.18:49:17.968>
created_at = <Date 2020-06-17.10:22:48.334>
labels = ['extension-modules', 'type-feature', 'library', '3.10']
title = 'Provide wrapper for eventfd'
updated_at = <Date 2021-08-07.04:51:45.767>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2021-08-07.04:51:45.767>
actor = '4-launchpad-kalvdans-no-ip-org'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-13.18:49:17.968>
closer = 'christian.heimes'
components = ['Extension Modules', 'Library (Lib)']
creation = <Date 2020-06-17.10:22:48.334>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 41001
keywords = ['patch']
message_count = 2.0
messages = ['371727', '380922']
nosy_count = 2.0
nosy_names = ['christian.heimes', '4-launchpad-kalvdans-no-ip-org']
pr_nums = ['20930']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41001'
versions = ['Python 3.10']

[tiran]

eventfd is a Linux syscall that returns a file descriptor for event/notify systems. I propse to add a simple eventfd(initval, flags) function that is a wrapper around glibc's eventfd abstraction layer. High level notify and semaphores can then be implemented in pure Python.

See https://man7.org/linux/man-pages/man2/eventfd.2.html for more details

See https://bugs.python.org/issue40485 for a use case.

[tiran]

New changeset cd9fed6 by Christian Heimes in branch 'master':
bpo-41001: Add os.eventfd() (bpo-20930)
cd9fed6