Function wait_callback_registry

crates/stdlib/src/overlapped.rs:1702–1707

()

    > = std::sync::OnceLock::new();

    fn wait_callback_registry() -> &'static std::sync::Mutex<
        std::collections::HashMap<isize, alloc::sync::Arc<PostCallbackData>>,
    > {
        WAIT_CALLBACK_REGISTRY
            .get_or_init(|| std::sync::Mutex::new(std::collections::HashMap::new()))
    }

    // Callback data for RegisterWaitWithQueue
    // Uses Arc to ensure the data stays alive while callback is executing