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Safety-Critical Java: level 2 in practice

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JournalConcurrency and Computation: Practice and Experience
DateAccepted/In press - 1 Aug 2016
DatePublished (current) - 16 Sep 2016
Number of pages27
Pages (from-to)1-27
Original languageEnglish

Abstract

Safety-Critical Java (SCJ) is a profile of the Real-Time Specification for Java that brings to the safety-critical industry the possibility of using Java. SCJ defines three compliance levels: Level 0, Level 1 and Level 2. The SCJ specification is clear on what constitutes a Level 2 application in terms of its use of the defined API but not the occasions on which it should be used. This paper broadly classifies the features that are only available at Level 2 into three groups: nested mission sequencers, managed threads and global scheduling across multiple processors. We explore the first two groups to elicit programming requirements that they support. We identify several areas where the SCJ specification needs modifications to support these requirements fully; these include the following: support for terminating managed threads, the ability to set a deadline on the transition between missions and augmentation of the mission sequencer concept to support composibility of timing constraints. We also propose simplifications to the termination protocol of missions and their mission sequencers. To illustrate the benefit of our changes, we present excerpts from a formal model of SCJ Level 2 written in Circus, a state-rich process algebra for refinement. Copyright © 2016 John Wiley & Sons, Ltd.

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Copyright © 2016 John Wiley & Sons, Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

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