HRT-HOOD: a structured design method for hard real-time systems
Real-Time Systems
European air traffic flow management: porting a large application to GNU/linux
Proceedings of the 2003 annual ACM SIGAda international conference on Ada: the engineering of correct and reliable software for real-time & distributed systems using ada and related technologies
Ravenscar design patterns?: reflections on use of the Ravenscar profile
IRTAW '03 Proceedings of the 12th international workshop on Real-time Ada
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We are designing the on-board software for the GOCE satellite platform so that static analysis can verify its real-time requirements. Our aim is to analyse the binary code to derive bounds on the worst-case execution time for each task, followed by a schedulability analysis using preemptive fixed-priority scheduling. The code-analysis step constrains the sequential coding and the schedulability-analysis step constrains the concurrency design (tasking). We use the Ravenscar tasking profile further limited to a single suspension point per task and a single call of each protected entry. We discuss how this profile matches the real-time requirements and its impact on the designers, the software architecture and the resource usage. The main issue is that the single-suspension-point rule prevents procedural abstraction of operations that involve input-output. Some design patterns emerge from this example.