Real time systems
Real time systems are brought in use when the rigid time requirements are placed on the operation of the processor or the flow of data; hence it is frequently used as a control device in the dedicated application. Examples are systems which control scientific experiments, industrial control systems medical imaging systems and various display systems.
A real time system has properly defined, fixed time constraints, and if the system does not produce output for an input within the time limits, the system will fail automatically. For example, it would not do for a robot arm to be instructed to stop after it had smashed into the car it was making.
Real time systems generally come in two flavors: hard and soft. A hard real time system guarantees that critical and complicated tasks be completed on time. These goal desires that all delays in the system be completed on the time. This goal desires that all delays in the system be bounded, from the retrieval of saved data to the time it takes the operating system to complete any request made of it. Secondary storage of any sort is commonly limited or missing, with data instead being stored in the short-term memory or in read only memory. Most of the advanced operating system features are absent too, since they tend to separate the user from the hardware, and that separation results in uncertainty about the quantity of time an operation will take to finish the job given.
A less restrictive type of the real time system is the soft real time system, where a critical real-time task gets precedence over other tasks, and retains that precedence until it completes the job. As in the hard real time systems, the operating system kernel delays are required to be bounded. Soft real time is an achievable goal or target which can be mixed with the other types of systems, whereas hard real time systems conflict with the operation of other systems like time-sharing systems, and the two cannot be mixed together.
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