no_std + atomic_polyfill
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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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categories = ["asynchronous", "concurrency"]
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exclude = ["/.*"]
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exclude = ["/.*"]
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[dependencies]
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# Uses user-provided critical sections on targets without atomics.
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atomic-polyfill = { version = "1", optional = true }
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[dev-dependencies]
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[dev-dependencies]
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futures = "0.3.5"
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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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//! `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, `atomic-polyfill`, which uses a polyfill
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//! from the [`atomic-polyfill`] crate in order to provide functionality
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//! to targets without atomics. See the [`README`] for the [`atomic-polyfill`]
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//! crate for more information on how this is implemented by the end-user.
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//!
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//! [`atomic-polyfill`]: https://crates.io/crates/atomic-polyfill
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//! [`README`]: https://github.com/embassy-rs/atomic-polyfill/blob/main/README.md
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use std::cell::UnsafeCell;
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#![no_std]
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use std::fmt;
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use std::sync::atomic::AtomicUsize;
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use core::cell::UnsafeCell;
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use std::sync::atomic::Ordering::{AcqRel, Acquire, Release};
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use core::fmt;
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use std::task::Waker;
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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 = "atomic-polyfill"))]
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use core::sync::atomic::AtomicUsize;
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#[cfg(feature = "atomic-polyfill")]
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use atomic_polyfill::AtomicUsize;
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/// A synchronization primitive for task wakeup.
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/// A synchronization primitive for task wakeup.
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///
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///
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