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

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Chapter 19: Real-Time Systems Chapter 19: Real-Time Systems
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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
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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
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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.
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19.5 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts System Characteristics System Characteristics Single purpose Small size Inexpensively mass-produced Specific timing requirements
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19.6 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts
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