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What do you mean by a real time operating system and explain?

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Real time operating system in short RTOS which is used for real time operations. 

Imagine that you are designing an airbag system for a new model of car. In this case, a small error in timing (causing the airbag to deploy too early or too late) could be catastrophic and cause injury. In this case we need a hard real time operations this is where the real time operating system will comes in to the picture.
In general, an operating system (OS) is responsible for managing the hardware resources of a computer and hosting applications that run on the computer. An RTOS performs these tasks, but is also specially designed to run applications with very precise timing and a high degree of reliability. This can be especially important in measurement and automation systems where downtime is costly or a program delay could cause a safety hazard.
This slide share is having a very good view of real time operating system


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