Tool Set Implementation for Scenario-based Multithreading of UML-RT Models and Experimental Validation

This paper presents our tool set implementation for scenario-based multithreading of object-oriented real-time models and an accompanying experimental validation. Our tools enable the automated, schedulability-aware implementation of real-time object-oriented models, exploiting an existing CASE tool. Our implementation is facilitated by (1) our customized run-time system modified to support scenario-based thread execution, (2) a design model template that centralizes the arrival of external inputs, (3) a model analyzer tool, and (4) a model-specific code modifier tool. Our tools simplify design by removing thread-related design concerns from the modeling process, separating design and implementation. We performed validation by conducting experiments that clearly demonstrate the performance improvements that can be gained through our scenario-based implementation: response time improvements for high priority tasks of as much as 70% and a 5-fold decrease in blocking or the elimination of blocking for some tasks.