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Stepwise refinement of interrupt-driven real-time programs

Cook, Phil & Fidge, Colin J. (2007) Stepwise refinement of interrupt-driven real-time programs.

Abstract

Embedded real-time programs rely on external interrupts to respond to events in their physical environment in a timely fashion. Formal program verification theories, such as the refinement calculus, are intended for development of sequential, block-structured code and do not allow for asynchronous control constructs such as interrupt service routines. In this article we extend the refinement calculus to support formal development of interrupt-dependent programs. To do this we: use a timed semantics, to support reasoning about the occurrence of interrupts within bounded time intervals; introduce a restricted form of concurrency, to model composition of interrupt service routines with the main program they may preempt; introduce a semantics for shared variables, to model contention for variables accessed by both interrupt service routines and the main program; and use real-time scheduling theory to discharge timing requirements on interruptible program code.

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ID Code: 47589
Item Type: Report
Keywords: Program refinement, Real-time programming, Embedded systems, Interrupt handling, Formal methods
Subjects: Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > COMPUTER SOFTWARE (080300) > Software Engineering (080309)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2007 Phil Cook and Colin Fidge
Deposited On: 13 Dec 2011 08:28
Last Modified: 13 Dec 2011 10:58

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