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Constructing Predictable Real Time Systems by Wolfgang A. Halang, Alexander D. Stoyenko (auth.)

By Wolfgang A. Halang, Alexander D. Stoyenko (auth.)

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Modula-2 [189] is a widely-used dialect of Modula, aimed at systems implementation. The language drops Modula's concurrent processes synchronised via monitors, waits and signals in favour of quasiconcurrent co-routines and explicit run-time scheduler invocations. This change makes Modula-2 less suitable for "programming-in-the-Iarge". Othertchangesafrom Modula, such as Modula-2's treatment of I/O as low level operations, have raised questions about program portability and maintainability [128]7.

Higher level, specification and logic languages, such as Esterel [26,25] or Modechart [91], are outside the scope of the Chapter. 3 Requirements of a Real Time Language Real time software must be guaranteed to meet its timing constraints [161, 183, 26, 70, 166, 46, 16, 15]. , to be schedulability analysable. This requirement is unique among programming language requirements in that it applies to real time languages only. To us, it is the most important requirement of all. Real time programs must be very reliable in general.

Naturally, the demand for high dependability does not imply an unrealistic expectation that a system will never fail. Indeed, no technical system is absolutely reliable. However, using appropriate measures, one must strive to make the violation of deadlines and corresponding damages quantifiable and as unlikely as possible. In doing so, the individual limitations of a real time system must be recognised and the risk of its utilisation in process control must be carefully pondered [81]. Data to be processed may arrive randomly distributed in time, according to the definition of the real time operating mode.

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