Allow usage on `no_std` targets and targets using `portable-atomic` (#7)
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@ -29,6 +29,10 @@ jobs:
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if: startsWith(matrix.rust, 'nightly')
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run: cargo check -Z features=dev_dep
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- run: cargo test
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- name: Install cargo-hack
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uses: taiki-e/install-action@cargo-hack
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- run: rustup target add thumbv7m-none-eabi
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- run: cargo hack build --target thumbv7m-none-eabi --no-default-features --no-dev-deps
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msrv:
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runs-on: ubuntu-latest
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@ -19,5 +19,9 @@ keywords = ["waker", "notify", "wake", "futures", "async"]
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categories = ["asynchronous", "concurrency"]
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exclude = ["/.*"]
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[dependencies]
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# Uses portable-atomic polyfill atomics on targets without them
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portable-atomic = { version = "0.3", optional = true, default-features = false }
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[dev-dependencies]
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futures = "0.3.5"
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26
src/lib.rs
26
src/lib.rs
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@ -1,10 +1,26 @@
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//! `futures::task::AtomicWaker` extracted into its own crate.
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//!
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//! # Features
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//!
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//! This crate adds a feature, `portable-atomic`, which uses a polyfill
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//! from the [`portable-atomic`] crate in order to provide functionality
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//! to targets without atomics. See the [`README`] for the [`portable-atomic`]
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//! crate for more information on how to use it on single-threaded targets.
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//!
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//! [`portable-atomic`]: https://crates.io/crates/portable-atomic
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//! [`README`]: https://github.com/taiki-e/portable-atomic/blob/main/README.md#optional-cfg
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use std::cell::UnsafeCell;
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use std::fmt;
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use std::sync::atomic::AtomicUsize;
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use std::sync::atomic::Ordering::{AcqRel, Acquire, Release};
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use std::task::Waker;
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#![no_std]
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use core::cell::UnsafeCell;
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use core::fmt;
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use core::sync::atomic::Ordering::{AcqRel, Acquire, Release};
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use core::task::Waker;
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#[cfg(not(feature = "portable-atomic"))]
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use core::sync::atomic::AtomicUsize;
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#[cfg(feature = "portable-atomic")]
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use portable_atomic::AtomicUsize;
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/// A synchronization primitive for task wakeup.
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///
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