Protected kernels and Ada 9X real-time facilities

Abstract

Many of the Ada 9X mappings will have a dramatic impact on current implementations of Ada run-time executives. This impact is particularly severe for the case of run-time systems that are implemented with protected kernels, often required in real-time military imbedded systems. Further, we believe that run-time systems that provide these new 9X facilities will be required to use techniques that are less efficient than current run-time systems at providing Ada 83 tasking services. Consequently, existing Ada systems tha t meet performance requirements may require modification to tread water .This report considers the proposed 9X changes which affect the implementation of real-time Ada run-time systems, addresses why these features impact the run-time, and, where possible, suggests optimizations to minimize the performance impact on properly implemented applications.