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    // Copyright 2013 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Useful synchronization primitives.
    //!
    //! This module contains useful safe and unsafe synchronization primitives.
    //! Most of the primitives in this module do not provide any sort of locking
    //! and/or blocking at all, but rather provide the necessary tools to build
    //! other types of concurrent primitives.

    #![stable(feature = "rust1", since = "1.0.0")]

    #[stable(feature = "rust1", since = "1.0.0")]
    pub use alloc_crate::sync::{Arc, Weak};
    #[stable(feature = "rust1", since = "1.0.0")]
    pub use core::sync::atomic;

    #[stable(feature = "rust1", since = "1.0.0")]
    pub use self::barrier::{Barrier, BarrierWaitResult};
    #[stable(feature = "rust1", since = "1.0.0")]
    pub use self::condvar::{Condvar, WaitTimeoutResult};
    #[stable(feature = "rust1", since = "1.0.0")]
    pub use self::mutex::{Mutex, MutexGuard};
    #[stable(feature = "rust1", since = "1.0.0")]
    pub use self::once::{Once, OnceState, ONCE_INIT};
    #[stable(feature = "rust1", since = "1.0.0")]
    pub use sys_common::poison::{PoisonError, TryLockError, TryLockResult, LockResult};
    #[stable(feature = "rust1", since = "1.0.0")]
    pub use self::rwlock::{RwLock, RwLockReadGuard, RwLockWriteGuard};

    pub mod mpsc;

    mod barrier;
    mod condvar;
    mod mutex;
    mod once;
    mod rwlock;

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