Real-time features for Ada 9X

Ada 9X is a revision of the Ada programming language standard. This revision includes some changes that are intended to improve Ada´s usefulness for real-time applications. The changes under consideration include multiple clocks, new forms of delay statements, a new low-level data synchronization scheme based on a limited form of priority inheritance, and a mechanism for asynchronously controlling the execution of a task. These proposals deserve critical evaluation and refinement before they become part of a new standard. The authors deal with time measurement and with a mechanism for synchronizing shared data. They address changes to the Ada priority scheduling model and discuss a mechanism for improving responsiveness to asynchronous events