Kelvin Nilsen
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Digital Library
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Index Terms
- Adding real-time capabilities to Java
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Reviews
Allan James Payne
Nilsen has introduced real-time features into his implementation of Java, in the form of the PERC real time application programming interface (API). This paper starts by describing the facilities and implementation of Java. It presents translation techniques that have been developed during the evolution of Java, such as just-in-time and ahead-of-time translation methods. Runtime environments are explained, and the generations of the Java Virtual Machine are presented. The paper develops real-time programming requirements and defines their constraints. Nilsen explains why real-time programming needs Java and vice versa. He discusses where Java falls short in its support of real-time programming, describing in detail how the garbage collection, task scheduling, and task monitoring facilities are deficient. Having developed the argument that current Java implementations do not support real-time programming, the author describes how the PERC real-time API fills the requirements. He describes the PERC Java language extensions to protect code from interrupts and to request and allocate resources. He goes on to show how the run time environment supports the language features and extended garbage collection techniques needed for real-time programming.
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