gh-116738: Audit thread-safety for termios module

[yoney]

This is a placeholder PR to mark the termios module as audited in gh-116738 for thread safety in the free-threading build.

• The POSIX functions used by termios are marked as MT-Safe in the Linux termios(3). There are no thread safety issues noted in the POSIX documentation.
• The current CPython implementation wraps posix functions with Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS which assumes they are thread-safe.
• Additionally, the module tests were run under thread-sanitizer, which did not report any errors.

cc: @mpage@colesbury@Yhg1s

Note: This PR will be closed after termios is marked in gh-116738

[vstinner]

This is a placeholder PR to mark the termios module as audited

I don't understand the purpose of this PR. If no code change is needed, I suggest closing the PR.

[yoney]

This is a placeholder PR to mark the termios module as audited

I don't understand the purpose of this PR. If no code change is needed, I suggest closing the PR.

@vstinner Thank you for your feedback! Sorry for any confusion, my intention wasn’t to land this diff. I created this PR mainly as a placeholder to mark the termios module as audited in gh-116738. I added a note to the description, but I realise it might not be visible at the end. Could you please mark termios? I’ll go ahead and close this PR.

Thanks again!