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Non-preemptive interrupt scheduling for safe reuse of legacy drivers in real-time systems

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4 Author(s)

Low-level support of peripheral devices is one of the most demanding activities in a real-time operating system. In fact, the rapid development of new interface boards causes a tremendous effort at the operating system level for writing and testing low-level drivers for supporting the new hardware. The possibility of reusing legacy drivers in real-time systems would offer the great advantage of keeping the rate of changes with a small programming effort. Since typical legacy drivers are written to execute in a non-preemptive fashion, a suitable operating system mechanism is needed to protect real-time application tasks from unpredictable bursty interrupt requests. In this paper, we present a novel approach suitable for scheduling interrupt service routines. Main features of the method include: high priority of the handler, non preemptive execution, bandwidth reservation for the application tasks, and independence of the interrupt service policy from the scheduling policy adopted for the application tasks.

Published in:

Real-Time Systems, 2005. (ECRTS 2005). Proceedings. 17th Euromicro Conference on

Date of Conference:

6-8 July 2005