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#![cfg(target_thread_local)]
#![unstable(feature = "thread_local_internals", issue = "none")]
#[cfg(any(
    target_os = "linux",
    target_os = "fuchsia",
    target_os = "redox",
    target_os = "emscripten"
))]
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
    use crate::mem;
    use crate::sys_common::thread_local_dtor::register_dtor_fallback;
    extern "C" {
        #[linkage = "extern_weak"]
        static __dso_handle: *mut u8;
        #[linkage = "extern_weak"]
        static __cxa_thread_atexit_impl: *const libc::c_void;
    }
    if !__cxa_thread_atexit_impl.is_null() {
        type F = unsafe extern "C" fn(
            dtor: unsafe extern "C" fn(*mut u8),
            arg: *mut u8,
            dso_handle: *mut u8,
        ) -> libc::c_int;
        mem::transmute::<*const libc::c_void, F>(__cxa_thread_atexit_impl)(
            dtor,
            t,
            &__dso_handle as *const _ as *mut _,
        );
        return;
    }
    register_dtor_fallback(t, dtor);
}
#[cfg(target_os = "macos")]
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
    use crate::cell::Cell;
    use crate::ptr;
    #[thread_local]
    static REGISTERED: Cell<bool> = Cell::new(false);
    if !REGISTERED.get() {
        _tlv_atexit(run_dtors, ptr::null_mut());
        REGISTERED.set(true);
    }
    type List = Vec<(*mut u8, unsafe extern "C" fn(*mut u8))>;
    #[thread_local]
    static DTORS: Cell<*mut List> = Cell::new(ptr::null_mut());
    if DTORS.get().is_null() {
        let v: Box<List> = box Vec::new();
        DTORS.set(Box::into_raw(v));
    }
    extern "C" {
        fn _tlv_atexit(dtor: unsafe extern "C" fn(*mut u8), arg: *mut u8);
    }
    let list: &mut List = &mut *DTORS.get();
    list.push((t, dtor));
    unsafe extern "C" fn run_dtors(_: *mut u8) {
        let mut ptr = DTORS.replace(ptr::null_mut());
        while !ptr.is_null() {
            let list = Box::from_raw(ptr);
            for (ptr, dtor) in list.into_iter() {
                dtor(ptr);
            }
            ptr = DTORS.replace(ptr::null_mut());
        }
    }
}
#[cfg(target_os = "vxworks")]
pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
    use crate::sys_common::thread_local_dtor::register_dtor_fallback;
    register_dtor_fallback(t, dtor);
}