Function gio_2_0_sys::g_async_initable_init_async

pub unsafe extern "C" fn g_async_initable_init_async(
    initable: *mut GAsyncInitable, 
    io_priority: gint, 
    cancellable: *mut GCancellable, 
    callback: Option<GAsyncReadyCallback>, 
    user_data: gpointer
)