lecture19-chapter10 - OperatingSystems Lecture18:

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Operating Systems Lecture 18: Real Time and Real Life Scheduling Anda Iamnitchi anda@cse.usf.edu 1
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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 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 Systems Control of laboratory experiments Process control in industrial plants Robotics Air traffic control Telecommunications Military command and control systems
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Round Robin scheduling unacceptable
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(Nonpreemptive) Priority driven unacceptable
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Combine priorities with clock based interrupts (preemption points)
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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 - OperatingSystems Lecture18:

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