Futures-rs is a library providing the foundations for asynchronous programming in Rust.
The library addresses the need for ergonomic and efficient async control flow by offering core trait definitions like Stream alongside utilities such as join!, select!, and combinator methods. These primitives enable developers to compose asynchronous operations expressively without runtime overhead. The project works in both standard and no_std environments, though the API surface is reduced when the standard library is unavailable.
Futures-rs suits projects that need foundational async abstractions rather than a complete runtime. It is particularly valuable for library authors building async ecosystems and for applications requiring fine-grained control over asynchronous composition. The tool provides the building blocks that higher-level async frameworks depend on, making it essential infrastructure for Rust's async ecosystem rather than a batteries-included solution for end-user applications.
The project receives most of its issue reports from outside users rather than the core team, reflecting a substantial base of real-world adopters. Responses to issues and pull requests typically arrive within one to two weeks. Work in the issue tracker centers on feature requests, stream-related improvements, and bug fixes.
