Abstract
The requirements to be fulfilled by languages in hard real-time environments, and corresponding language constructs necessitated by them, are summarised. Aimed towards enabling the production of reliable software for time-critical applications, the syntax and semantics of appropriate extensions of the high-level real-time language PEARL are described, mainly providing the following features: application oriented resource synchronisation with time-out and inherent deadlock prevention; constructs to express the exact time behaviour of tasks and to survey the occurrence and sequence of events; support of due dates observing task scheduling algorithms allowing the early detection and handling of overload conditions; accurate timing of operations; and application oriented simulation regarding the operating system overhead for software verification purposes. Finally, the operating system functions required by the proposed language elements and verification tools are outlined, and it is reported, to which extend and how they are already provided by the PEARL oriented real-time operating system PORTOS.
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