ch19 - Silberschatz, Galvin and Gagne 2009 Chapter 19:...

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Unformatted text preview: Silberschatz, Galvin and Gagne 2009 Chapter 19: Real-Time Systems 19.2 Silberschatz, Galvin and Gagne 2009 Chapter 19: Real-Time Systems System Characteristics Features of Real-Time Systems Implementing Real-Time Operating Systems Real-Time CPU Scheduling An Example: VxWorks 5.x 19.3 Silberschatz, Galvin and Gagne 2009 Objectives To explain the timing requirements of real-time systems To distinguish between hard and soft real-time systems To discuss the defining characteristics of real-time systems To describe scheduling algorithms for hard real-time systems 19.4 Silberschatz, Galvin and Gagne 2009 Overview of Real-Time Systems A real-time system requires that results be produced within a specified deadline period An embedded system is a computing device that is part of a larger system (I.e. automobile, airliner) A safety-critical system is a real-time system with catastrophic results in case of failure A hard real-time system guarantees that real-time tasks be completed within their required deadlines A soft real-time system provides priority of real-time tasks over non real-time tasks 19.5 Silberschatz, Galvin and Gagne 2009 System Characteristics Single purpose Small size Inexpensively mass-produced Specific timing requirements 19.619....
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ch19 - Silberschatz, Galvin and Gagne 2009 Chapter 19:...

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