By Wolfgang A. Halang, Alexander D. Stoyenko (auth.)
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Media reports, February 1993
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Extra resources for Constructing Predictable Real Time Systems
Moreover, a real time language should make provisions for error handling. Real time software almost always involves multiprogramming. Thus, a real time language should include process definitions, as well as process synchronisation mechanisms, in other words support the task concept. Many real time systems are quite large. S. aerospace and defence companies. On the average, a project involved 30 programmers coding 150,000 instructions. Under such circumstances, a real time language must be very modular and allow separate compilation, thus enhancing "programming-in-the-Iarge" .
With assembly languages came a number of advantages, the biggest being, perhaps, the ability to write location-independent code3 . Assembly language instructions operate directly on registers and memory locations, usually bit, byte or word at a time. Most contemporary assemblers also come with macro definitions, data block operations, and other advanced (from an assembly programmer's point of view) features. Despite being so low level, assembly language was still widely used in the late Seventies and even the Eighties.
ILIAD is PLjI-like, well-structured and has strong typing. It also has process definitions, error handling through a user defined (one per system) error process, critical regions for process synchronisation, time andjor event dependent process delays, and direct hardware access constructs. ILIAD allows for separate compilation, and its programs are easy to maintain. However, the language makes no provisions for schedulability analysis, is not modular, and lacks structured exception handlers and process synchronisation primitives.