By Alan Burns
Ada is the single ISO-standard, object-oriented, concurrent, real-time programming language. it really is meant to be used in huge, long-lived functions the place reliability and potency are crucial, relatively real-time and embedded platforms. during this e-book, Alan Burns and Andy Wellings supply an intensive, self-contained account of the way the Ada tasking version can be utilized to build a variety of concurrent and real-time platforms. this can be the single publication that makes a speciality of an in-depth dialogue of the Ada tasking version. Following on from the authors' past identify Concurrency in Ada, this publication brings the dialogue modern to incorporate the recent Ada 2005 language and the new advances in real-time programming thoughts. 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 examining and a chief reference paintings that may sit down along the language reference guide.
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Extra info for Concurrent and Real-Time Programming in Ada
The effect of fast process switching is to give behaviour that is almost indistinguishable from true parallelism. In the programming of embedded systems, one must deal with the inherent parallelism of the larger system. A real-time language must therefore provide some facility for multi-programming. This can be achieved by specifying a standard interface to a multiprocessing operating system‡ or by allowing multiple process systems to be expressed in the language itself. Ada provides for the direct programming of parallel activities.
Mutual exclusion is catered for by only one execution of ACQUIRE or RELEASE being allowed at any one time. The above code recognises, but does not deal with, the call of an ACQUIRE procedure when there are no resources available. This is an example of a condition synchronisation, for the ACQUIRE cannot be successful until a call of RELEASE is made. Although it would be possible to implement this synchronisation using a semaphore defined within the monitor, Hoare (1974) proposed a simpler primitive.
Definition: The term passive will be used to indicate a reactive entity that can allow open access. The implementation of resource entities requires some form of control agent. If the control agent is itself passive (such as a semaphore), then the resource is said to be protected. Alternatively, if an active agent is required to program the correct level of control, then the resource is in some sense active. Definition: The term server will be used to identify an active resource entity, and the term protected resource to indicate the passive kind.