radium
radium provides abstractions and graceful degradation for behavior that must
be shared-mutable, but merely may use atomic instructions to do so.
The primary export is the Radium trait. This is implemented on all symbols
in the atomic module, and on their Cell<T> equivalents, and presents the
atomic inherent API as a trait. Your code can be generic over Radium, use a
stable and consistent API, and permit callers to select atomic or Cell
behavior as they need.
The symbols in the atomic module are conditionally present according to the
target architecture’s atomic support. As such, code that is portable across
targets with varying atomic support cannot use those names directly. Instead,
the radium::types module provides names that will always exist, and forward
to the corresponding atomic type when it exists and the equivalent Cell<T>
type when it does not.
As the cfg(target_has_atomic) compiler attribute is unstable, radium
provides the macro radium::if_atomic! to perform conditional compilation based
on atomic availability.
This crate is #![no_std]-compatible, and uses no non-core types.
Target Architecture Compatibility
Because the compiler does not expose this information to libraries, radium
uses a build script to detect the target architecture and emit its own
directives that mark the presence or absence of an atomic integer. We accomplish
this by reading the compiler’s target information records and copying the
information directly into the build script.
If radium does not work for your architecture, please update the build script
to handle your target string and submit a pull request. We write the build
script on an as-needed basis; it is not proactively filled with all of the
information listed in the compiler.
@kneecaw - https://twitter.com/kneecaw/status/1132695060812849154
Feelin' lazy: Has someone already written a helper trait abstracting operations over
AtomicUsizeandCell<usize>for generic code which may not care about atomicity?
@ManishEarth - https://twitter.com/ManishEarth/status/1132706585300496384
no but call the crate radium
(since people didn't care that it was radioactive and used it in everything)