Function pk_task_refresh_cache_sync 

pub unsafe extern "C" fn pk_task_refresh_cache_sync(
    task: *mut PkTask,
    force: gboolean,
    cancellable: *mut GCancellable,
    progress_callback: PkProgressCallback,
    progress_user_data: gpointer,
    error: *mut *mut GError,
) -> *mut PkResults