tailieunhanh - Lecture Software engineering (7/e): Chapter 15 – Ian Sommerville

This chapter presents the following content: To explain the concept of a real-time system and why these systems are usually implemented as concurrent processes, to describe a design process for real-time systems, to explain the role of a real-time operating system, to introduce generic process architectures for monitoring and control and data acquisition systems. | Real-time Software Design Objectives To explain the concept of a real-time system and why these systems are usually implemented as concurrent processes To describe a design process for real-time systems To explain the role of a real-time operating system To introduce generic process architectures for monitoring and control and data acquisition systems Topics covered System design Real-time operating systems Monitoring and control systems Data acquisition systems Real-time systems Systems which monitor and control their environment. Inevitably associated with hardware devices Sensors: Collect data from the system environment; Actuators: Change (in some way) the system's environment; Time is critical. Real-time systems MUST respond within specified times. Definition A real-time system is a software system where the correct functioning of the system depends on the results produced by the system and the time at which these results are produced. A soft real-time system is a system whose | Real-time Software Design Objectives To explain the concept of a real-time system and why these systems are usually implemented as concurrent processes To describe a design process for real-time systems To explain the role of a real-time operating system To introduce generic process architectures for monitoring and control and data acquisition systems Topics covered System design Real-time operating systems Monitoring and control systems Data acquisition systems Real-time systems Systems which monitor and control their environment. Inevitably associated with hardware devices Sensors: Collect data from the system environment; Actuators: Change (in some way) the system's environment; Time is critical. Real-time systems MUST respond within specified times. Definition A real-time system is a software system where the correct functioning of the system depends on the results produced by the system and the time at which these results are produced. A soft real-time system is a system whose operation is degraded if results are not produced according to the specified timing requirements. A hard real-time system is a system whose operation is incorrect if results are not produced according to the timing specification. Stimulus/Response Systems Given a stimulus, the system must produce a response within a specified time. Periodic stimuli. Stimuli which occur at predictable time intervals For example, a temperature sensor may be polled 10 times per second. Aperiodic stimuli. Stimuli which occur at unpredictable times For example, a system power failure may trigger an interrupt which must be processed by the system. Architectural considerations Because of the need to respond to timing demands made by different stimuli/responses, the system architecture must allow for fast switching between stimulus handlers. Timing demands of different stimuli are different so a simple sequential loop is not usually adequate. Real-time systems are therefore usually designed as cooperating

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