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Systematic formal verification for fault-tolerant time-triggered algorithms

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1 Author(s)
Rushby, J. ; Comput. Sci. Lab., SRI Int., Menlo Park, CA, USA

Many critical real-time applications are implemented as time-triggered systems. We present a systematic way to derive such time-triggered implementations from algorithms specified as functional programs (in which form their correctness and fault-tolerance properties can be formally and mechanically verified with relative ease). The functional program is first transformed into an untimed synchronous system and, then, to its time-triggered implementation. The first step is specific to the algorithm concerned, but the second is generic and we prove its correctness. This proof has been formalized and mechanically checked with the PVS verification system. The approach provides a methodology that can ease the formal specification and assurance of critical fault-tolerant systems

Published in:

Software Engineering, IEEE Transactions on  (Volume:25 ,  Issue: 5 )

Date of Publication:

Sep/Oct 1999

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