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What is Real-time Constraints

Handbook of Research on Industrial Informatics and Manufacturing Intelligence: Innovations and Solutions
Execution of real-time tasks must satisfy three types of constraints. Timing constraints enforce each task instance to complete its execution before D after the date the task is released (D is a relative deadline); precedence constraints force partially task instance order and the read of current data values; resource constraints represent the exclusive access to shared resources.
Published in Chapter:
Feasible Automatic Reconfigurations of Real-Time OS Tasks
Hamza Gharsellaoui (National Institute of Applied Sciences and Technology, Tunisia), Atef Gharbi (National Institute of Applied Sciences and Technology, Tunisia), Mohamed Khalgui (Martin Luther University, Germany), and Samir Ben Ahmed (National Institute of Applied Sciences and Technology, Tunisia)
DOI: 10.4018/978-1-4666-0294-6.ch017
This research deals with reconfigurable uniprocessor embedded real-time systems to be implemented by different OS tasks that should be independent, synchronous, and periodic, and that should meet functional and temporal properties described in user requirements. The authors define two forms of automatic reconfigurations assumed to be applied at run-time: addition-removal of tasks or just modifications of their temporal parameters; WCET and/or periods. The authors define a new semantic of reconfigurations where a crucial criterion to consider is the automatic improvement of the system’s feasibility at run-time.
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