Modeling and schedulability analysis in the development of real-time distributed Ada systems
IRTAW '02 Proceedings of the 11th international workshop on Real-time Ada workshop
Modeling and Schedulability Analysis of Hard Real-Time Distributed Systems Based on Ada Components
Ada-Europe '02 Proceedings of the 7th Ada-Europe International Conference on Reliable Software Technologies
Building high-integrity distributed systems with Ravenscar restrictions
IRTAW '07 Proceedings of the 13th international workshop on Real-time Ada
A survey on standards for real-time distribution middleware
ACM Computing Surveys (CSUR)
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In this paper we address the problem of combining two issues that are standardized separately in two Ada 95 annexes: Real-Time Systems (Annex D) and Distributed Systems (Annex E). With these annexes it is possible to build applications with real-time requirements, or alternatively distributed applications; but real-time distributed applications are not directly supported. In this paper we propose extensions to the Distributed Systems Annex that would provide support for developing distributed real-time applications in Ada. The paper proposes an interface for assigning priorities to the messages in the interconnection networks, and also to the tasks executing remote operations, in a way that avoids priority inversions. It also addresses the issues of configuration of the RPC handler tasks and non blocking asynchronous remote procedure calls.