A data-processing system (DTS) includes a central hardware unit (CPU) and an additional hardware unit (HW), the central hardware unit (CPU) being adapted to execute a task by a processing thread (TM), and to trigger offloading of execution of a first part (P1a, P1b, P2) of the task to the additional hardware unit (HW); and wherein the additional hardware unit is adapted to call on functionalities of the central hardware unit (CPU), triggered by the first part, and the central hardware unit (CPU) executes a second part (P2) of the task forming a sub-part of the first part by a service processing thread (TS).