Function gio_sys::g_async_initable_new_async

pub unsafe extern "C" fn g_async_initable_new_async(
    object_type: GType, 
    io_priority: c_int, 
    cancellable: *mut GCancellable, 
    callback: GAsyncReadyCallback, 
    user_data: gpointer, 
    first_property_name: *const c_char,
     ...
)