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    // Copyright 2015 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.

    //! Unix-specific extensions to primitives in the `std::process` module.

    #![unstable(feature = "thread_extensions", issue = "29791")]

    use os::unix::raw::{pthread_t};
    use sys_common::{AsInner, IntoInner};
    use thread::{JoinHandle};

    #[unstable(feature = "thread_extensions", issue = "29791")]
    pub type RawPthread = pthread_t;

    /// Unix-specific extensions to `std::thread::JoinHandle`
    #[unstable(feature = "thread_extensions", issue = "29791")]
    pub trait JoinHandleExt {
        /// Extracts the raw pthread_t without taking ownership
        fn as_pthread_t(&self) -> RawPthread;
        /// Consumes the thread, returning the raw pthread_t
        ///
        /// This function **transfers ownership** of the underlying pthread_t to
        /// the caller. Callers are then the unique owners of the pthread_t and
        /// must either detech or join the pthread_t once it's no longer needed.
        fn into_pthread_t(self) -> RawPthread;
    }

    #[unstable(feature = "thread_extensions", issue = "29791")]
    impl<T> JoinHandleExt for JoinHandle<T> {
        fn as_pthread_t(&self) -> RawPthread {
            self.as_inner().id() as RawPthread
        }
        fn into_pthread_t(self) -> RawPthread {
            self.into_inner().into_id() as RawPthread
        }
    }

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