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Testing of Multi-Tasking Real-Time Systems with Critical Sections

Authors:

Anders Pettersson, Henrik Thane

Research group:

Software Testing Laboratory

Publication Type:

Conference/Workshop Paper

Venue:

In proceedings of the 9th International Conference on Real-Time and Embedded

Abstract

In this paper we address the problem of testing real-time software in the functional domain. In order to achieve reproducible and deterministic test results of an entire multitasking real-time system it is essential not to only con-sider inputs and outputs, but also the order in which tasks communicate and synchronize with each other. We present a deterministic white-box system-level control-flow testing method for deterministic integration testing of real-time system software. We specifically address fixed priority scheduled real-time sys-tems where synchronization is resolved using the Priority Ceiling Emulation Protocol or offsets in time. The method includes a testing strategy where the coverage criterion is defined by the number of paths in the system control flow. The method also includes a reachability algorithm for deriving all possible paths in terms of orderings of task starts, preemptions and completions of tasks executing in a real-time system. The deterministic testing strategy allows test methods for sequential programs to be applied, since each identified ordering can be regarded as a sequential program.

Bibtex

@inproceedings{Pettersson409,
author = {Anders Pettersson and Henrik Thane},
title = {Testing of Multi-Tasking Real-Time Systems with Critical Sections},
month = {February},
year = {2003},
booktitle = {In proceedings of the 9th International Conference on Real-Time and Embedded},
url = {http://www.es.mdu.se/publications/409-}
}