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Journals ACM SIGAda Ada Letters Volume 18 Issue 6

The Ravenscar Tasking Profile for High Integrity Real-Time Programs Brian Dobbing Aonix-Europe Ltd Partridge House, Newtown Road Henley-on-Thames RG9 1 EN UK +44 1491 415016 Alan Burns University of York Heslington York, UK brian@uk.aonix.com burns@minster.cs.york.ac.uk 1. ABSTRACT The Ravenscar Profile defines a simple subset of the tasking features of Ada, in order to support efficient, high integrity applications that need to he analyzed for their timing properties. This paper describes the Profile, which is being endorsed by the IS0 working group that is giving guidelines on the use of Ada in high integrity systems. An implementation of the Profile is then described in terms of development practice, run-time characteristics, certification, size and performance. The important issue of enforcing the restrictions imposed by the Ravenscar Profile at compile-time using Ada95 pragma Restrictions is also addressed. 1.l Keywords Ada, tasking, safety-critical, high-integrity, Ravenscar 2. INTRODUCTION High-integrity systems traditionally do not make use of high-level language features such as Ada tasking. This is despitethe fact that such systemsare inherently concurrent. Concurrency is viewed as a ˜systems ™ issue. It is visible during design and in the construction of the cyclic executive that implementsthe separatecode fragments,but it is not addressed within the

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The Ravenscar tasking profile for high integrity real-time programs

Dobbing, Brian; Burns, Alan
ACM SIGAda Ada Letters , Volume XVIII (6)
Association for Computing Machinery – Nov 1, 1998

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