g_simple_async_result_new_error
g_simple_async_result_new_from_error
g_simple_async_result_new_take_error
+g_simple_async_result_set_check_cancellable
g_simple_async_result_set_op_res_gpointer
g_simple_async_result_get_op_res_gpointer
g_simple_async_result_set_op_res_gssize