A system is real time when timeliness is a dimension of correctness; that means a correct answer delivered late is the same as an answer that has never been delivered. Real-time systems abound in the real world. To a degree, all systems are real time, because they have real-world deadlines: an airline ticketing program needs to issue tickets before the plane leaves, for example. Meeting deadlines is one aspect of real-time systems; the other is that the system behaves in a predictable manner. If the aforementioned airline reservation system issues tickets within 24 hours and does so for every ticketing request, the system can be considered real time.


Critical Section Virtual Memory Page Fault Round Robin Schedule Priority Inversion 
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© Gene Sally 2010

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  • Gene Sally

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