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    // Copyright 2014-2015 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.

    #![allow(dead_code)] // not used on all platforms

    use mem;
    use libc;

    pub type Key = libc::pthread_key_t;

    #[inline]
    pub unsafe fn create(dtor: Option<unsafe extern fn(*mut u8)>) -> Key {
        let mut key = 0;
        assert_eq!(libc::pthread_key_create(&mut key, mem::transmute(dtor)), 0);
        key
    }

    #[inline]
    pub unsafe fn set(key: Key, value: *mut u8) {
        let r = libc::pthread_setspecific(key, value as *mut _);
        debug_assert_eq!(r, 0);
    }

    #[inline]
    pub unsafe fn get(key: Key) -> *mut u8 {
        libc::pthread_getspecific(key) as *mut u8
    }

    #[inline]
    pub unsafe fn destroy(key: Key) {
        let r = libc::pthread_key_delete(key);
        debug_assert_eq!(r, 0);
    }

    #[inline]
    pub fn requires_synchronized_create() -> bool {
        false
    }

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