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Figure from:Survey of Real Time Scheduling Algorithms

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A RTS consists of four parts: Physical process (which is controlled by the computer for some productive end); Sensors (Converts state of physical process into information analog or digital); Computer (Based on information from sensors, deduces state of physical process and issues commands to control the process) and Actuators (In response to commands issued computer, modifies the physical process)sa shown in fiaure 2.1 Hard-Real-Timesystem which must meet its deadline, otherwise it will cause undesirable damage or a fatal error to the system. Soft-Real-Time System, which has an associated deadline that is desirable but not mandatory, it still makes sense to schedule and complete the task even if it has passed its deadline. We will focus on the Hard- Real-Time system.

Figure 1 A RTS consists of four parts: Physical process (which is controlled by the computer for some productive end); Sensors (Converts state of physical process into information analog or digital); Computer (Based on information from sensors, deduces state of physical process and issues commands to control the process) and Actuators (In response to commands issued computer, modifies the physical process)sa shown in fiaure 2.1 Hard-Real-Timesystem which must meet its deadline, otherwise it will cause undesirable damage or a fatal error to the system. Soft-Real-Time System, which has an associated deadline that is desirable but not mandatory, it still makes sense to schedule and complete the task even if it has passed its deadline. We will focus on the Hard- Real-Time system.