You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/phaser/phaser/vendor/parking_lot_core/src/thread_parker/windows
    
    the code of the file until where you have to start completion: // Copyright 2016 Amanieu d'Antras
//
// Licensed under the Apache License, V
    
    fn create() -> &'static Backend {
        // Try to create a new Backend
        let backend;
        if let Some(waitaddress) = waitaddress::WaitAddress::create() {
            backend = Backend::WaitAddress(waitaddress);
        } else if let Some(keyed_event) = keyed_event::KeyedEvent::create() {
            backend = Backend::KeyedEvent(keyed_event);
        } else {
            panic!(
                "parking_lot requires either NT Keyed Events (WinXP+) or \
                 WaitOnAddress/WakeByAddress (Win8+)"
            );
        }

        // Try to set our new Backend as the global one
        let backend_ptr = Box::into_raw(Box::new(backend));
        match BACKEND.compare_exchange(
            ptr::null_mut(),
            backend_ptr,
            Ordering::Release,
            Ordering::Relaxed,
        ) {
            Ok(_) => unsafe { &*backend_ptr },
            Err(global_backend_ptr) => {
                unsafe {
                    // We lost the race, free our object and return the global one
                    Box::from_raw(backend_ptr);
                    &*global_backend_ptr
                }
            }
        }
    }