Chocolate: A reservation-based Real-Time Java']Java environment on Windows/NT

In this paper, we present Chocolate, a reservation-based Real-Time Java run-time environment that runs on Windows NT. We first present a brief overview of the emerging Real-Time Java standard and the Resource Kernel (RK) approach to providing timely: guaranteed and enforced access to system resources. Chocolate is a real-rime Java Virtual Machine that interfaces the real-rime Java programming language with the abstractions of a resource kernel. It also supports memory, regimes to control allocation rime and a protocol to bound priority inversion. This version of Chocolate is implemented on top of NT/RK, an OS environment that includes a "portable resource kernel" within the NT kernel. Our detailed evaluation of Chocolate shows that the overhead introduced by NT/RK is acceptable. A Real-Time Java audio package on Chocolate demonstrates significantly better performance than its non-real-time counterpart. However, our Hartstone benchmark evaluations also show that our NT/RK implementation does have its drawbacks due to the lack of hard real-time capabilities within Windows NT.