gh-125716: Use A Global Mutex When Initializing Global State For The _interpqueues Module

[ericsnowcurrently]

This includes a drive-by cleanup in _queues_init() and _queues_fini().

This change also applies to the _interpchannels module.

• Issue: test_concurrent_futures.test_interpreter_pool failing #125716

[ericsnowcurrently]

!buildbot AMD64 Arch Linux Usan Function

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @ericsnowcurrently for commit 27fcb3c 🤖

The command will test the builders whose names match following regular expression: AMD64 Arch Linux Usan Function

The builders matched are:

• AMD64 Arch Linux Usan Function PR

[ericsnowcurrently]

The USAN buildbot passed test_interpreter_pool. It could be an intermittent race, but it's been failing fairly consistently on 3.x for several days, so the odds are in my favor. 😄 I'm going to proceed as though this fixes the problem but will monitor to see if there are further failures after this lands.

[ericsnowcurrently]

@ZeroIntensity, would you mind a quick review? Thanks!

[ZeroIntensity]

I think this works. It's probably worth refactoring channels to use PyMutex over PyThread_type_lock in the future, but this is fine for now.

[miss-islington-app]

Thanks @ericsnowcurrently for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

[bedevere-app]

GH-125817 is a backport of this pull request to the 3.13 branch.