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    // Copyright 2014 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.

    #![allow(dead_code)] // stack_guard isn't used right now on all platforms

    use cell::RefCell;
    use string::String;
    use thread::Thread;
    use thread::LocalKeyState;

    struct ThreadInfo {
        stack_guard: Option<usize>,
        thread: Thread,
    }

    thread_local! { static THREAD_INFO: RefCell<Option<ThreadInfo>> = RefCell::new(None) }

    impl ThreadInfo {
        fn with<R, F>(f: F) -> Option<R> where F: FnOnce(&mut ThreadInfo) -> R {
            if THREAD_INFO.state() == LocalKeyState::Destroyed {
                return None
            }

            THREAD_INFO.with(move |c| {
                if c.borrow().is_none() {
                    *c.borrow_mut() = Some(ThreadInfo {
                        stack_guard: None,
                        thread: NewThread::new(None),
                    })
                }
                Some(f(c.borrow_mut().as_mut().unwrap()))
            })
        }
    }

    pub fn current_thread() -> Option<Thread> {
        ThreadInfo::with(|info| info.thread.clone())
    }

    pub fn stack_guard() -> Option<usize> {
        ThreadInfo::with(|info| info.stack_guard).and_then(|o| o)
    }

    pub fn set(stack_guard: Option<usize>, thread: Thread) {
        THREAD_INFO.with(|c| assert!(c.borrow().is_none()));
        THREAD_INFO.with(move |c| *c.borrow_mut() = Some(ThreadInfo{
            stack_guard: stack_guard,
            thread: thread,
        }));
    }

    // a hack to get around privacy restrictions; implemented by `std::thread`
    pub trait NewThread {
        fn new(name: Option<String>) -> Self;
    }

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