An overrun method to support composition of semi-independent real-time components

• Engineers of embedded software systems rely on efficient design techniques and tools along with efficient run-time support. In the design of complex embedded real-time systems, the Hierarchical Scheduling Framework (HSF) has been introduced as a design-time framework enabling compositional schedulability analysis of embedded software systems with real-time properties. Moreover, the HSF provides a run-time framework guaranteeing that these non-functional requirements are met. In this paper a system consists of a number of semi-independent components called subsystems, and these subsystems are allowed to share logical resources. The HSF makes sure that the individual subsystems respect their allocated CPU budgets. However, as semi-independent sub-systems share logical resources, extra complexity is introduced. Specifically, the contribution of this paper is a novel method to allow for budget overruns; a common scenario when a subsystem utilizes shared logical resources. This proposed method is not only more resource efficient than existing methods, but it is also more appropriate for supporting composability of independently developed real-time subsystems.

Nyckelord

Budget control

Chlorine compounds

Computer applications

Computer software

Computers

Embedded systems

Hierarchical systems

Software design

Word processing

Budget overruns

Composability

Compositional schedulability analysis

Design techniques

Embedded real-time systems

Embedded software systems

Hierarchical scheduling

Independent components

Non-functional requirements

Novel methods

Real-time properties

Run-time

Sub-systems

Support composition

Time components

Real time systems

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