Document Type


Date of Award

Fall 1-31-1996

Degree Name

Doctor of Philosophy in Computing Sciences - (Ph.D.)


Computer and Information Science

First Advisor

Lonnie R. Welch

Second Advisor

Dieter K. Hammer

Third Advisor

Franz J. Kurfess

Fourth Advisor

James A. McHugh

Fifth Advisor

Peter A. Ng

Sixth Advisor

Wilhelm Rossak

Seventh Advisor

Wei Zhao


The use of object-based mechanisms, i.e., abstract data types (ADTs), for constructing software systems can help to decrease development costs, increase understandability and increase maintainability. However, execution efficiency may be sacrificed due to the large number of procedure calls, and due to contention for shared ADTs in concurrent systems. Such inefficiencies are a concern in real-time applications that have stringent timing requirements. To address these issues, the potentially inefficient procedure calls are turned into a source of concurrency via asynchronous procedure calls (ARPCs), and contention for shared ADTS is reduced via ADT cloning. A framework for concurrency analysis in object-based systems is developed, and compiler techniques for identifying potential concurrency via ARPCs and cloning are introduced. Exploitation of the parallelizing compiler techniques is illustrated in the context of an incremental schedule construction algorithm that enhances concurrency incrementally so that feasible real-time schedules can be constructed. Experimental results show large speedup gains with these techniques. Additionally, experiments show that the concurrency enhancement techniques are often useful in constructing feasible schedules for hard real-time systems.



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