Experimentation in CPU control with Real-Time Java

Describes experiences in using an object-oriented language (Java) in designing, prototyping and evaluating a CPU manager. “QoS Animator” facilitates the execution of Java applications with time requirements and provides protection mechanisms to preserve the system´s integrity against untrusted code. It is adapted to the system performance and provides a rate-monotonic-based scheduling algorithm, a worst-case execution time (WCET) calculation at run-time, and protection from high CPU-consuming and “bad” code. The introduction of a low-frequency filter enhances the timeliness offered to applications in general-purposes operating systems. The evaluation was done with a Windows NT-specific prototype and proved successful