ch19 - Chapter 19: Real-Time Systems Chapter 19: Real-Time...

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Unformatted text preview: Chapter 19: Real-Time Systems Chapter 19: Real-Time Systems 19.2 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts Chapter 19: Real-Time Systems Chapter 19: Real-Time Systems ■ System Characteristics ■ Features of Real-Time Systems ■ Implementing Real-Time Operating Systems ■ Real-Time CPU Scheduling ■ VxWorks 5.x 19.3 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts Objectives 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 ©2005 Operating System Concepts Overview of Real-Time Systems 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 ©2005 Operating System Concepts System Characteristics System Characteristics ■ Single purpose ■ Small size ■ Inexpensively mass-produced ■ Specific timing requirements 19.6 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts...
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This note was uploaded on 01/21/2012 for the course COMPUTER CSCI 593 taught by Professor Hamnes during the Spring '11 term at Aston University.

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ch19 - Chapter 19: Real-Time Systems Chapter 19: Real-Time...

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