Implementation of the Java']Java language in a persistent DSM operating system

Java has gained considerable attention, in, the IT-world. The Java language and its class library is widely used for application development in the context of the World Wide Web and elsewhere. The popularity of the Java language also makes it attractive for other areas such as Operating System development. Our Plurix project implements a Distributed Shared Memory (DSM) Operating System (OS) establishing a new memory consistency model based on restartable transactions and optimistic synchronization. The OS is developed with a proprietary Java compiler transforming Java sources into Intel protected mode code. Abandoning the hardware independence of Java eliminates performance loss and allows developing the total OS in Java. In tills paper we shortly review the architecture of the Plurix Java Compiler (PJC). We discuss the compact memory layout of Pluris Java run-time structures in, detail. Furthermore we present an elegant and efficient implementation of Java interfaces. Finally we show hour PJC supports hardware-level programming.