Implementation of state machines with tasks and protected objects

Authors:
Bo I. Sandén
Affiliations:
Colorado Technical University, 4435 N. Chestnut Street, Colorado Springs, CO
Venue:
ACM SIGAda Ada Letters
Year:
2000

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A Design Pattern for State Machines and Concurrent Activities

Ada Europe '01 Proceedings of the 6th Ade-Europe International Conference Leuven on Reliable Software Technologies

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Abstract

State machines are common in real-time software. They are also a standard way of describing the life of an object in object-oriented analysis and design. Their use is fairly straightforward but non-trivial. The examples in this article show implementations of state machines and associated activities by means of tasks and protected objects. They cover a range of synchronization and communication needs between activity and state machine.