# lib.rs - source
Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-channel-0.3.14/src/lib.rs`.
Keywords: rust, rustlang, rust-lang

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    //! Asynchronous channels.
    //!
    //! Like threads, concurrent tasks sometimes need to communicate with each
    //! other. This module contains two basic abstractions for doing so:
    //!
    //! - [oneshot], a way of sending a single value from one task to another.
    //! - [mpsc], a multi-producer, single-consumer channel for sending values
    //!   between tasks, analogous to the similarly-named structure in the standard
    //!   library.
    //!
    //! All items are only available when the `std` or `alloc` feature of this
    //! library is activated, and it is activated by default.

    #![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))]

    #![cfg_attr(not(feature = "std"), no_std)]

    #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms, unreachable_pub)]
    // It cannot be included in the published code because this lints have false positives in the minimum required version.
    #![cfg_attr(test, warn(single_use_lifetimes))]
    #![warn(clippy::all)]
    #![doc(test(attr(deny(warnings), allow(dead_code, unused_assignments, unused_variables))))]

    #[cfg(all(feature = "cfg-target-has-atomic", not(feature = "unstable")))]
    compile_error!("The `cfg-target-has-atomic` feature requires the `unstable` feature as an explicit opt-in to unstable features");

    macro_rules! cfg_target_has_atomic {
        ($($item:item)*) => {$(
            #[cfg_attr(feature = "cfg-target-has-atomic", cfg(target_has_atomic = "ptr"))]
            $item
        )*};
    }

    cfg_target_has_atomic! {
        #[cfg(feature = "alloc")]
        extern crate alloc;

        #[cfg(feature = "alloc")]
        mod lock;
        #[cfg(feature = "std")]
        pub mod mpsc;
        #[cfg(feature = "alloc")]
        pub mod oneshot;
    }