Double processing offloading to additional and central processing units

1. A method for executing a task on a data-processing system including a central hardware unit and an additional hardware unit, said task being executed by a processing thread of said central hardware unit, said method comprising:

an offloading step of execution of a first part of said task to said additional hardware unit;

a step by said additional hardware unit for calling on functionalities of said central hardware unit that are triggered by a triggering sub-part of said first part, by the additional hardware unit;

an offloading step, during execution of the first part, of a second part that is a sub-part of the first part, from the additional hardware unit to the central hardware unit, the second part being different from the triggering sub-part of the first part; and

an execution step of execution of the second part, by a service processing thread of said central hardware unit,

wherein the triggering sub-part of the first part is not offloaded from the additional hardware unit to the central hardware unit.

2. The method according to claim 1 , wherein, on completion of execution of said second part of said task, said central hardware unit sends a notification to said additional hardware unit.

3. The method according to claim 2 , wherein, on completion of execution of said first part of said task, said additional hardware unit sends a notification to said central hardware unit.

4. The method according to claim 2 , wherein data transmissions between said additional hardware unit and said central hardware unit transit via an operating system executed by said central hardware unit.

5. The method according to claim 1 , wherein, on completion of execution of said first part of said task, said additional hardware unit sends a notification to said central hardware unit.

6. The method according to claim 5 , wherein data transmissions between said additional hardware unit and said central hardware unit transit via an operating system executed by said central hardware unit.

7. The method according to claim 1 , wherein data transmissions between said additional hardware unit and said central hardware unit transit via an operating system executed by said central hardware unit.

8. A computer program comprising instructions stored in a non-transitory computer-readable medium, which, once loaded onto an information-processing system, are configured to implement the method according to claim 1 .

9. A data-processing system, comprising:

a central hardware unit; and

an additional hardware unit,

wherein the central hardware unit is configured to execute a task by a processing thread and to trigger offloading of execution of a first part of said task to said additional hardware unit,

the additional hardware unit is configured to call on functionalities of said central hardware unit, triggered by a triggering sub-part of said first part,

during execution of the first part, a second part is offloaded from the additional hardware unit to the central hardware unit, the second part being a sub-part of the first part, the second part being different from the triggering sub-part of the first part, and

said central hardware unit executes the second part by a service processing thread,

wherein the triggering sub-part of the first part is not offloaded from the additional hardware unit to the central hardware unit.

10. The data-processing system according to claim 9 , wherein, on completion of execution of said second part of said task, said central hardware unit sends a notification to said additional hardware unit.

11. The data-processing system according to claim 10 , wherein, on completion of execution of said first part of said task, said additional hardware unit sends a notification to said central hardware unit.

12. The data-processing system according to claim 10 , wherein data transmissions between said additional hardware unit and said central hardware unit transit via an operating system executed by said central hardware unit.

13. The data-processing system according to claim 10 , further comprising a communication bus for data transmissions between said additional hardware unit and said central hardware unit.

14. The data-processing system according to claim 9 , wherein, on completion of execution of said first part of said task, said additional hardware unit sends a notification to said central hardware unit.

15. The data-processing system (DTS) according to claim 14 , wherein data transmissions between said additional hardware unit (HW) and said central hardware unit (CPU) transit via an operating system (OS) executed by said central hardware unit.

16. The data-processing system (DTS) according to claim 14 , further comprising a communication bus for data transmissions between said additional hardware unit and said central hardware unit.

17. The data-processing system according to claim 9 , wherein data transmissions between said additional hardware unit and said central hardware unit transit via an operating system executed by said central hardware unit.

18. The data-processing system according to claim 9 , further comprising a communication bus for data transmissions between said additional hardware unit and said central hardware unit.

19. A computer program comprising instructions stored in a non-transitory computer-readable medium, which, once loaded onto an information-processing system, are adapted to implement the method according to claim 2 .

20. A computer program comprising instructions stored in a non-transitory computer-readable medium, which, once loaded onto an information-processing system, are adapted to implement the method according to claim 5 .