Definition of Real Time
Real-time problems are those for which timeliness, “Occurring at a suitable or opportune time,”[3] is a correctness criterion. If the process finishes late, it is wrong, or at least noticeably less satisfactory than a process that completes on time.
[3] The American Heritage Dictionary of the English Language, Third Edition, Houghton Mifflin Company, 1992.
Timeliness always matters. Few people would call a word processor, a compiler, or a payroll system a real-time system, but perhaps they should. If a word processor takes more than a few tenths of a second to echo a character, its user may become concerned about the competence of the programmers. If a compiler takes much longer than expected to compile a program, its user ...
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