Baker T.P., G.M. Scallon, An Architecture for Real-Time Software Systems, IEEE Software, Vol. 3, No. 3, pp. 50-58, May 1986  Home/Search   Document Not in Database   Summary   Related Articles   Check

....of software. In particular, in this paper, we look at the issue of what constitutes an architecture of a real time system software. Architectures specific to real time and related systems have been studied or proposed in a number of papers, in the last one and a half decade, for example [2, 4, 7, 15, 23, 32, 35]. Some of these papers propose interesting ideas to approach the real time software architecture problem from the perspective of control engineering. This approach seems to be very promising and is pursued by us, but to be fully fruitful and understood it has to be tied to some more fundamental ....

Baker T.P., G.M. Scallon, An Architecture for Real-Time Software Systems, IEEE Software, Vol. 3, No. 3, pp. 50-58, May 1986

....many system try to decouple, rather than coordinate. Halang and Stoyenko point out that an integrated approach is required to construct a predictable real time system [9] Systems addressing some aspects of integration have existed for some time, but do not span the software development cycle [1]. In most system, functional abstraction is supported by some off theshelf design language followed by implementation with a real time programming language such as Spring C [14, 16] extensions to C [12, 19, 13] extensions to the PEARL process control language [23] or others [3, 8] This ....

Baker, T., Scallon, G., An Architecture for RealTime Software Systems. IEEE Software, 2(5):5058, May 1986.

....systems to identify and process. In general, the maximum length of time a suspended process will wait for an external event is embodied in the timeout. No special purpose statements for timeouts are provided by Ada, although the required functionality is available using the select construct [BS86]. 2.4.4 DEADLINE SPECIFICATION AND SCHEDULING To satisfy the deadlines (timing constraints) of real, physical systems, simple timeouts are not sufficient. For this reason, these constraints must be incorporated into the concurrency model of the real time language. The constraints, in turn, ....

T.P. Baker and G.M. Scallon. "An Architecture for Real-Time Software Systems," in [SR88]; reprint from IEEE Software, May 1986, pp 50-58.

.... long been used in programming real time systems, and has been termed slice based by Shaw, who characterizes it as one of the two basic approaches to real time programming [Shaw, 1986] Descriptions of systems using this approach are provided by MacLaren [MacLaren, 1980] and by Baker and Scallon [Baker and Scallon, 1986]. All Swift RAID operations are defined as cooperating sequences of serially executed atomic primitives. The atomic primitives are called instructions. Each instruction corresponds to a C subroutine that implements the instruction. Each instruction s implementation is atomic with respect to ....

....approach similar to that described here have been used in the past. In addition to use within various I O controllers and coprocessors, this approach has often been used in real time avionics [Glass, 1983] Discussions of this approach can be found in literature [MacLaren, 1980, Shaw, 1986, Baker and Scallon, 1986] The use of static precompiled tables is discussed by MacLaren, who refers to this approach as a traditional cyclic executive. Our approach differs from that of MacLaren in that we generate our plans dynamically and our finite state machine is event driven, rather than cycle time driven. ....

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Baker, T. P. and Scallon, G. M. (1986). An architecture for real-time software systems. IEEE Software, pages 50--58.

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