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The increasing use of computers for real-time control on board spacecrafts has brought with it a greater emphasis on the development methodology used for such systems. By their nature, spacecraft control computers have to operate unattended for long periods and because of the programmatics of space, systems are subject to a long development cycle. As a result, there are two distinct concerns, the first being that the development approach guarantees functional and timing correctness, the second being that problems, particularly those associated with timing, are considered as early as possible in the spacecraft development life cycle. The European Space Agency has, for a number of years, encouraged the development of software using HOOD. It was thus a natural next step to investigate the incorporation of time within the existing HOOD framework. This has proven to be very beneficial and this book describes the approach developed by the authors for handling Hard Real-Time applications. It describes both the background scheduling theory, provides practical examples of its application to real life problems, and demonstrates how it is used in the various phases of the development of Hard Real-Time systems.
The increasing use of computers for real-time control on board spacecrafts has brought with it a greater emphasis on the development methodology used for such systems. By their nature, spacecraft control computers have to operate unattended for long periods and because of the programmatics of space, systems are subject to a long development cycle. As a result, there are two distinct concerns, the first being that the development approach guarantees functional and timing correctness, the second being that problems, particularly those associated with timing, are considered as early as possible in the spacecraft development life cycle. The European Space Agency has, for a number of years, encouraged the development of software using HOOD. It was thus a natural next step to investigate the incorporation of time within the existing HOOD framework. This has proven to be very beneficial and this book describes the approach developed by the authors for handling Hard Real-Time applications. It describes both the background scheduling theory, provides practical examples of its application to real life problems, and demonstrates how it is used in the various phases of the development of Hard Real-Time systems.
The refereed proceedings of the 8th International Conference on Reliable Software Technologies, Ada-Europe 2003, held in Toulouse, France in June 2003. The 29 revised full papers presented together with 3 invited papers were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on Ravenscar, language issues, static analysis, distributed information systems, software metrics, software components, formal specification, real-time kernel, software testing, and real-time systems design.
Annotation Proceedings of the February 1997 workshop, WORDS'97, include one panel discussion--selecting quality of service in a heterogeneous environment: bandwidth, security, fault tolerance and real-time behavior. The rest of the 45 papers are organized in sessions on models/language, operating systems/architecture, system engineering, system validation and verification, applications, dependability and fault tolerance, and communication. Two early bird sessions covered a variety of topics, including object-based checkpoints in distributed systems and time-bounded cooperative recovery with the distributed real-time application. No index. Annotation copyrighted by Book News, Inc., Portland, OR.
It is increasingly accepted that future dependable, real-time digital computer control systems will have distributed architectures. Advantages of distributed computer control systems include the possibility of composing large systems out of pre-tested components with minimal integration effort, their well-defined fault containment properties and their capacity to make effective use of mass-produced silicon chips. The IFAC Workshop series on Distributed Computer Control Systems (DCCS) focuses on design requirements and fundamental principles encountered in such systems and highlights and traces the growth of key concepts at their various stages of development. Theoretical and application-oriented viewpoints receive equal emphasis. These Workshops also provide an excellent forum for the exchange of information on recent technological advances and practices in the distributed computer control field. The 1997 DCCS Workshop was notable for the attention given to practical implementations of ideas that have been under discussion for decades and maintained the high technical standard set by previous Workshops in the series - the policy of concentrating on a specific topic, inviting a number of key authors and of accepting only a limited number of papers paid dividends.