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

    #![stable(feature = "thread_extensions", since = "1.9.0")]

    #[allow(deprecated)]
    use crate::os::unix::raw::pthread_t;
    use crate::sys_common::{AsInner, IntoInner};
    use crate::thread::JoinHandle;

    #[stable(feature = "thread_extensions", since = "1.9.0")]
    #[allow(deprecated)]
    pub type RawPthread = pthread_t;

    /// Unix-specific extensions to [`JoinHandle`].
    #[stable(feature = "thread_extensions", since = "1.9.0")]
    pub trait JoinHandleExt {
        /// Extracts the raw pthread_t without taking ownership
        #[stable(feature = "thread_extensions", since = "1.9.0")]
        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 detach or join the pthread_t once it's no longer needed.
        #[stable(feature = "thread_extensions", since = "1.9.0")]
        fn into_pthread_t(self) -> RawPthread;
    }

    #[stable(feature = "thread_extensions", since = "1.9.0")]
    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
        }
    }