Real-Time operating systems are used in environments where a large no. of events, mostly external to the computer system, must be accepted and processed inn a short time or with in certain deadlines. Such applications include industrial control, telephone switching equipment, flight control, and real-time simulations. Real-Time operating system are also frequently used in military operating system.
A primary objective of real-time operating systems is to provide quick event-response times, thus meet the scheduling deadlines. User convenience and resource utilization are of secondary concern to real-time operating system to be expected to process bursts of thousands of interrupts per second without missing a single event. Such requirements usually cannot be met by multiprogramming alone, and real-time operating system usually rely on some specific policies and techniques for doing their job.
Real-Time Operating System means that the system is subjected to real time. Real-Time System are becoming pervasive. Real-Time Operating System can allow to users to perform tasks within a guaranteed worst-case time fame. Real-Time Operating System make the people connect with each other in no time and feel the real environment of togetherness.
Real-Time Operating System is used for automatic system. Real-Time Operating System are used in aircrafts.
Due to small size of programs real time operating system can also used in embedded systems like in transport and others.
Types of real time operating system
1. Hard Real Time System.
2. Soft Real Time System.
Advantages of real time operating system:
1. Maximum Consumption- Real Time Operating System give maximum consumption and gives the more output while using all the resources and keeping all devices active.
2. Task Shifting- There is very little time assigned to shifting tasks in these systems.
3. Focus on application- These type of operating system focus on applications.
4. Error Free- It is error free that means it has no chances of error in performing tasks.
5. Memory Allocation- Memory allocation is best managed in these type of systems.
Disadvantages of real time operating system:
1. Limited tasks: There are limited tasks run at the same time.
2. Use heavy resources: Real time operating system used lot of system resources which is not good and it is costly.
3. Complex algorithms: Real Time operating system is used complex algorithms to achieve a desired output. It is very difficult to write that algorithms for a designer.
4.Expensive: Real time operating system are usually expensive because of the resources they need to work.
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