Safety-Critical Java: level 2 in practice

Journal article


Luckcuck, M., Wellings, A. and Cavalcanti, A. 2016. Safety-Critical Java: level 2 in practice. Concurrency Computation. https://doi.org/10.1002/cpe.3951
AuthorsLuckcuck, M., Wellings, A. and Cavalcanti, A.
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.

KeywordsSafety-Critical Java; Real-Time Specification; nested mission sequencers; managed threads ; global scheduling
Year2016
JournalConcurrency Computation
Digital Object Identifier (DOI)https://doi.org/10.1002/cpe.3951
Web address (URL)https://onlinelibrary.wiley.com/doi/10.1002/cpe.3951
https://eprints.whiterose.ac.uk/106765/
http://www.scopus.com/inward/record.url?eid=2-s2.0-84987859189&partnerID=MN8TOARS
Output statusPublished
Publication dates16 Sep 2016
Publication process dates
Accepted01 Aug 2016
Deposited31 Jan 2023
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