Event-driven Programming with Logical Exceution Times

Arkadeb Ghosal, Thomas A. Henzinger, Christoph M. Kirsch, and Marco A.A. Sanvido

We present a new high-level programming language, called xGiotto, for programming applications with hard real-time constraints. Like its predecessor, xGiotto is based on the LET (logical execution time) assumption: the programmer specifies when the outputs of a task become available, and the compiler checks if the specification can be implemented on a given platform. However, while the predecessor language Giotto was purely time-triggered, xGiotto accommodates also asynchronous events. Indeed, through a mechanism called event scoping, events are the main structuring principle of the new language. The xGiotto compiler and run-time system implement event scoping through a tree-based event filter. The compiler also checks programs for determinism (absence of race conditions) and time safety (schedulability).

Proceedings of the Seventh International Workshop on Hybrid Systems: Computation and Control (HSCC), Lecture Notes in Computer Science 2993, Springer, 2004, pp. 357-371.

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