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Distributed multimedia applications are typical of a new class of workstation applications that require real-time communication and computation services to be effective. Unfortunately, there remains a wide gap between the development of real-time computing technology in the research community and the deployment of real-time solutions in commercial systems.(More)
The Real-Time Specification for Java (RTSJ) provides facilities for deterministic, real-time execution in a language that is otherwise subject to variable latencies in memory allocation and garbage collection. A major consequence of these facilities is that the normal Java practice of passing around references to objects in heap memory cannot be used in(More)
Planetary science missions, such as those that explore Mars and Saturn, employ a variety of spacecraft such as arbiters, landers, probes, and rovers. Each of these kinds of spacecraft depends on embedded real-time control systems - systems that are increasingly being asked to do more as challenging new mission concepts are proposed. For both systems(More)
Modem real-time programming languages and operating systems provide support for monitoring the amount of CPU time a thread consumes. However, no system in widespread use fully integrates this monitoring with the scheduling facilities. The real-time specification for Java (RTSJ) provides an integrated approach to scheduling periodic threads and monitoring(More)
This paper describes a scheme we have used to manage a large library written in the C++ language. The scheme imposes a directory structure, and represents dependency hierarchy in a globally accessible file we call the 'prelude' file. We also discuss the structure of the description files (makefiles) used with the UNIX options we have found to be useful in(More)
An application enablement method that enables communications applications to run on protocols for which they were not written is discussed. The focus is on a subset of networks and communications application programming interfaces. The communications interface chosen is Berkeley sockets. The network protocols used are SNA (Systems Network Architecture) and(More)