文件名称：Development Process of Distributed Embedded Systems using VDM
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更新时间：2018-03-18 07:18:01
VDM-RT Formal method
This document is intended to provide readers who already have experience with general VDM concepts from language manuals [LangManPP] or books [Fitzgerald&05] and/or courses and it is also assumed that the reader has general knowledge about concepts using for concurrent systems [Ben-Ari82, Hoare85, Chandy&88, Milner89, Lea99]. From a tool perspective it is also assumed that the readers are already familiar with the basic functionality from Overture (http: //www.overturetool.org) and/or VDMTools (http://www.vdmbook.com/tools. php) and a UML tool such as Enterprise Arhictect (http://www.sparxsystems.com/) or Rational Rose (http://www-306.ibm.com/software/rational/). VDM [Jones90,Dawes91,Fitzgerald&98a] is a formal method [Craigen&93,Hinchey&95] and these are characterized by being able to express things in an abstract fashion and having a precise semantics for the models produced in these languages. Three different dialects exists for VDM; VDM-SL, VDM++ and VDM-RT [Larsen&10]. Some of these methods include methodological steps of getting from a very abstract model to a more concrete model. This process is typically referred to as refinement [Jones90,Morgan90,Woodcock&96,Back&98] when formal relationships are included between the different models. In this document no claims are made between the different models so no formal refinement will be included. This document is structured such that all readers with advantage can read the introduction in Chapter 1 first. In case the reader have limited experience and knowledge about synchronization of concurrent systems it may be an advantage then to just to Chapter 4 to get more knowledge about that before proceeding with the main process guidelines for the development of real-time systems in Chapter 2. The process is followed by a major example that is developed according to the guidelines presented in Chapter 3. Understanding that requires knowledge about both VDM and general concurrency principles. All the different models for the example used in this document are also available on-line from www.vdmbook.com so it is possible for the reader to get hands-on experience with them. In Chapter 5 periodic threads and statically schedulable systems are treated. Chapter 6 provides insight into the scheduling principles that can be used for the execution of concurrent and for distributed VDM-RT models in Overture and VDMTools. In Chapter 7 it is presented how postexecution analysis can be made of timed logfiles produced by VDMTools during execution of a scenario (primarily using the VDM-RT Runtime log viewer from Overture). Finally, Chapter 8 rounds off the document with a postscript indicating what the reader should have obtained at this point. 7