bpo-43352: Add a Barrier object in asyncio lib

[YvesDup]

bpo-43352: Add a Barrier object in asyncio lib

Copy design of object Barrier from threading, same features

Modified files are:

file lib/asyncio/locks.py

• Add Barrier and BrokenBarrierError objects
• Added these 2 previous objects to 'all' variable

file lib/test/test_asyncio/test_locks.py

• Add a BarrierTests object
• Modify STR_RGX_REPR to integrate 'repr' of Barrier
• Add a new test with Barrier in 'LockTest.test_lock_doesnt_accept_loop_parameter'

I am not familiar with git, so all files with .rst.bak extension are not in the scope of this PR

Just see https://bugs.python.org/issue37945, so the following paragraph can be deleted
"""
All tests (Win10 Python x64) are done and succesfull except one: python -m test -v test_locale
I am surprised about this error because, asyncio and locale are not linked, or are they ?
Please, how to proceed about this failure ? Open a new issue on bpo ?
a log file is available.
Thank for help
"""

https://bugs.python.org/issue43352

[the-knights-who-say-ni]

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[rhettinger]

Please post a clean PR. The current version touches 23 files, most of which are new bak files.

[YvesDup]

PR was cleaned, stayed only 2 files now

[rhettinger]

Please update the documentation.

[YvesDup]

@rhettinger I am a rookie on cpython.
Which documentation are talking about ? Are they files about asyncio files as https://github.com/python/cpython/blob/master/Doc/library/asyncio-api-index.rst and https://github.com/python/cpython/blob/master/Doc/library/asyncio-sync.rst ?
Thank you to help me to this first time
Yves

[asvetlov]

Sorry, bad merge with master

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @asvetlov for commit 3c30290 🤖

If you want to schedule another build, you need to add the ":hammer: test-with-buildbots" label again.

[asvetlov]

Merged. Thanks for your patience, @YvesDup

[YvesDup]

A very big thank you to @asvetlov and @1st1 for your support and all the work done together on this PR, my first one !!

Thanks to @eamanu for your review, and a special thanks to @JulienPalard for his help especially on the good practices on cpython world.

PS: @asvetlov should I do something else, or just close this PR ?

[asvetlov]

Everything is done. PR is merged, https://bugs.python.org/issue43352 is closed.
The last thing you can do is drop related branch on GitHub, it is up to you.

[YvesDup]

@asvetlov Please can tell me how to add a paragraph in whatnew 3.11#asyncio about this new feature ?
Thank you

[gvanrossum]

@YvesDup Just submit a PR for Doc/whatsnew/3.11.rst that adds the desired text, and tell the reviewer to mark it for backport to 3.11.

[gvanrossum]

You can reference the same issue (now migrated to #87518).

[YvesDup]

@gvanrossum Job in progress. Thank you