lecture19-chapter10 - Operating Systems Operating Lecture...

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Operating Systems Operating Systems Lecture 18: Lecture 18: Real-Time and Real-Life Real-Time and Real-Life Scheduling Scheduling Anda Iamnitchi [email protected] 1
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Real-Time Scheduling Real-Time Scheduling Correctness of the system depends not only on the logical result of the computation but also on the time at which the results are produced Tasks or processes attempt to control or react to events that take place in the outside world These events occur in “real time” and tasks must be able to keep up with them
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Hard vs. Soft Hard vs. Soft Hard vs. soft real time tasks: Hard: must meet a deadline Soft: deadline is desirable but not mandatory Periodic vs. aperiodic tasks Periodic: completed regularly, once per period T or T units apart Aperiodic: have time constraints either for deadlines or start
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Examples of Real-Time Examples of Real-Time Systems Systems Control of laboratory experiments Process control in industrial plants Robotics Air traffic control Telecommunications Military command and control systems
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Characteristics of Characteristics of Real Time Systems Real Time Systems Determinism Responsiveness User control Reliability Fail-soft operation
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Determinism Determinism Operations are performed at fixed, predetermined times or within predetermined time intervals Concerned with how long the operating system delays before acknowledging an interrupt and there is sufficient capacity to handle all the requests within the required time
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Responsiveness Responsiveness How long, after acknowledgment, it takes the operating system to service the interrupt
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This note was uploaded on 02/18/2012 for the course COP 4600 taught by Professor Andaiamnitchi during the Fall '08 term at University of South Florida - Tampa.

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lecture19-chapter10 - Operating Systems Operating Lecture...

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