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

    use crate::mem;

    pub type Key = libc::pthread_key_t;

    #[inline]
    pub unsafe fn create(dtor: Option<unsafe extern "C" 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
    }