Python3.14-nogil Support

[clauspruefer]

Problem

Currently building the atomicx module with pip3.14 fails with:

The configured Python interpreter version (3.14) is newer than PyO3's maximum supported version (3.13).

Solution

atomicx/Cargo.toml

Lines 11 to 14 in a3c3505

	[dependencies]
	num = "0.4.3"
	portable-atomic = { version = "1.9.0", features = ["std", "float"] }
	pyo3 = { version = "0.23", default-features = false, features = ["extension-module", "macros"] }

In line 14: update pyo3 version to 0.27 (currently tested, working on Ubuntu 24.04.3 LTS with Python3.14-nogil from deadsnakes PPA).
pyo3 = { version = "0.27", default-features = false, features = ["extension-module", "macros"] }

[clauspruefer]

@RuneBlaze See at:neelsomani/python-freethreading#1 your module 👍 makes python threading with Python NON-GIL (Global Interpreter Lock) performant again! I will write something on my blog https://www.der-it-pruefer.de/ in some days.

I have programmed a lot in C++ with atomic locks, boosts performance a lot if you know what you are doing.

[DisturbedOcean]

Any chance this fix could get in and a Python 3.14t wheel built? Thank you!

[clauspruefer]

@DisturbedOcean My fix should do the trick also for a standard Python. I am not 100% sure, a default CPython >3.13 ships with an included GIL which is deactivatable at runtime. Without deactivating the GIL atomic CPU operations in Python threads do not make sense at all.