1. A device for managing a real-time context of a system which comprises at least one processor working with a processor cycle so as to execute in apparent simultaneity several functions, each comprising an assembly of tasks providing high level services, and a coprocessor in the form of a component connected to said processor and availing of data relating to said real-time context, said coprocessor comprising means for managing the following steps: i) time slicing, from a pre-established frame, of said processing cycle into time slices of possible different durations; ii) allocating to each of said functions a corresponding set of time slices, according to a predetermined layout, the assembly of tasks of said function being activatable exclusively during the time slices of the allocated set, and being put in a frozen state outside the time slices of said allocated set; iii) saving, at the end of each of said time slices a machine context of the function to be processed before effecting a slice change; iv) when a new time slice allocated to one determined function is starting, loading the machine context previously saved at the end of a previous time slice allocated to this determined function, electing a top priority task to be executed belonging to said determined function, and activating said determined function so as to execute at first said priority task with the loaded machine context, wherein said coprocessor comprises at least three automata: first automaton for managing exchanges between said coprocessor and said processor, via a local memory, a swap memory, a common bus, a local exchange bus BiE and a hardware event bus; a second automaton for managing said functions during said time slices; a third automaton for managing certain real-time objects linked with an active function being performed during the time slice in process, especially for managing queues of eligible tasks awaiting said processor, for managing local time such as timeouts, for managing queues awaiting mailboxes and semaphores, for managing tasks awaiting global or local events and for handling external interruptions; these three automata communicating with one another by means of a bus inside the coprocessor component, primitives relating to global events being broadcast on said hardware event bus.