By Alan Burns

Ada is the single ISO-standard, object-oriented, concurrent, real-time programming language. it truly is meant to be used in huge, long-lived functions the place reliability and potency are crucial, really real-time and embedded platforms. during this e-book, Alan Burns and Andy Wellings supply a radical, self-contained account of the way the Ada tasking version can be utilized to build quite a lot of concurrent and real-time structures. this is often the one booklet that specializes in an in-depth dialogue of the Ada tasking version. Following on from the authors' prior identify Concurrency in Ada, this e-book brings the dialogue brand new to incorporate the recent Ada 2005 language and the new advances in real-time programming concepts. it is going to be of worth to software program execs and complicated scholars of programming alike: certainly each Ada programmer will locate it crucial studying and a chief reference paintings that might take a seat along the language reference handbook.

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Extra info for Concurrent and Real-Time Programming in Ada

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Also, certain data-flow machines BURNSWELL: “BURNS” — 2007/4/27 — 20:22 — PAGE 17 — #31 18 The nature and uses of concurrent programming require a completely different computational model. None the less, concurrent programming does represent one of the main ways of gaining access to standard multi-processor hardware. Software engineering principles indicate that the implementation languages should, wherever possible, mimic the structure of the application domain. If the application contains inherent parallelism, then the design and construction of the software product will be less error-prone, easier to prove correct and easier to adapt if concurrency is available in the design and implementation languages.

4 A simple embedded system 21 A detailed examination of task declaration is given in Chapter 4. However, a more informal description will be of use at this stage. Consider the following program skeleton: procedure Main is task A; task B; -- two tasks have been declared and named. task body A is separate; -- implementation of task A. task body B is separate; -- implementation of task B. begin -- A and B are now both executing concurrently. end Main; A task has a similar syntactical structure to that of a package (in that it has a specification and a body).

A process failing whilst executing a critical section presents particular difficulties. A graceful termination may still lead to deadlock if it does not release its mutual exclusive hold over the critical section. With pure message-based languages, reliability implies that systems should be resilient not only to process failure but also to message loss. This can be difficult. If BURNSWELL: “BURNS” — 2007/4/27 — 20:22 — PAGE 37 — #51 38 Inter-process communication process P1 sends a message to process P2, and expects a reply, what action should it take if the reply does not materialise?

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