Synchronization primitives built with portable-atomic.

• Provide Arc. (optional, requires the std or alloc feature)
• Provide task::Wake. (optional, requires the std or alloc feature)

See portable-atomic#1 for other primitives being considered for addition to this crate.

This crate was originally part of the portable-atomic repository and was extracted into its own repository.

• std
  Use std.

  Note:

  • This implicitly enables the alloc feature.

• alloc
  Use alloc.

  Note:

  • The MSRV when this feature is enabled and the std feature is not enabled is Rust 1.36 that alloc crate stabilized.

• serde
  Implement serde::{Serialize, Deserialize} for Arc.

  Note:

  • The MSRV when this feature is enabled is the one coming from serde, as of now it's Rust 1.56

One of the ways to enable cfg is to set rustflags in the cargo config:

# .cargo/config.toml
[target.<target>]
rustflags = ["--cfg", "portable_atomic_unstable_coerce_unsized"]

Or set environment variable:

RUSTFLAGS="--cfg portable_atomic_unstable_coerce_unsized" cargo ...

• --cfg portable_atomic_unstable_coerce_unsized
  Support coercing of Arc<T> to Arc<U> as in std::sync::Arc.

  This cfg requires Rust nightly because this coercing requires unstable CoerceUnsized trait.

  See this issue comment for another known workaround.

  Note: This cfg is unstable and outside of the normal semver guarantees and minor or patch versions of portable-atomic-util may make breaking changes to them at any time.

• portable-atomic: Portable atomic types including support for 128-bit atomics, atomic float, etc.
• atomic-maybe-uninit: Atomic operations on potentially uninitialized integers.
• atomic-memcpy: Byte-wise atomic memcpy.

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.