radium

• Deconflicted a symbol usage (Atomic) introduced by a nightly feature in the standard library. See [Rust #130539]

• Added Radium implementations for the [portable-atomic] crate.
• Relaxed Radium from being Sealed (forbidding implementations outside this crate) to merely unsafe. Foreign crates may now provide implementations as appropriate.

The Radium trait and RadiumT type aliases are carried over from version 0. The if_atomic! macro is removed, as the compiler stabilized #[cfg(target_has_atomic)].

Additionally, the Atom<T>, Isotope<T>, and Radon<T> type families allow user code to be generic over the integral primitive being managed. These types only accept primitives which can be made atomic, and Atom will reject primitives that do not have atomic instructions on the target.

Version 0

The development series created the Radium trait and RadiumT type aliases. It used a build script with manually-provided configuration values to select for the atomics that each target actually supported.

It will receive target updates as needed for clients who need to use Rust versions older than 1.60, but will not receive a backport of the 1.0 API.