Real time Operating System

 

Real time Operating System:

Real time Operating Systems are very fast and quick respondent systems. These systems are used in an environment where a large number of events must be accepted and processed in a short period of time. Real time processing requires quick transaction and characterized by supplying immediate response.

            In real time operating system there is a little swapping of programs between primary memory and secondary memory. Most of the time, processes remain in primary memory in order to provide quick response, therefore, memory management in real time system is less demanding compared to other operating system. 

Functions:

1)      Manage the processor and other system resources to meet the requirements of an application.

2)      Synchronize with and respond to the system events.

3)      Time-based scheduling used like round-robin scheduling.

4)      Move the data efficiently among processes and to perform coordination among these processes.

5)      Real time operating systems are error-free.

6)      In real time operating system Shifting time of the tasks is very less.

 

The Real Time systems are used in the environments where a large number of events is required to be accepted and is to be processed in the form of quick response. Such systems have to be the multitasking. So the primary function of the real time operating system is to manage certain system resources, such as the CPU, memory, and time. Each resource must be shared among the competing processes to accomplish the overall function of the system Apart from these primary functions of the real time operating system there are certain secondary functions that are not compulsory  but are included to enhance the performance:

1. To provide an efficient management of Random Access Memory .

2. To provide an just access to the computer resources.

The term real time refers to the technique of updating files with the transaction data immediately just after the event that it relates with.

Examples of real time processing:

·         Airlines reservation system.

·         Air traffic control system.

·         Systems that provide immediate updating.

·         Systems that provide up to the minute information on stock prices.

·         Defense application systems like as RADAR.

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