Operating systems are an essential part of any computer system. Similarly, operating systems, including Linux, Microsoft Windows, Apple Mac OS X, and. Nov 22, PDF | It includes an introduction to Operating system (OS): Computer system structure and organization. OS definition, function, history. An Operating System, or. OS, is low-level software that enables a user and higher -level application software to interact with a computer's hardware and the data.
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An operating system (OS) is a collection of software that manages computer understand the basic to advanced concepts related to Operating System. This course aims to: – explain the structure and functions of an operating system,. – illustrate key operating system aspects by concrete example, and. – prepare. We wrote this book as a text for an introductory course in operating systems at the junior for an understanding of operating systems are included in Chapter 1.
The time interval required to process and respond to inputs is very small. This time interval is called response time. Real-time systems are used when there are time requirements are very strict like missile systems, air traffic control systems, robots etc.
Examples of Real-Time Operating Systems are: Scientific experiments, medical imaging systems, industrial control systems, weapon systems, robots, air traffic control systems, etc.
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Some of the widely used operating systems are as follows- 1. Advantages of Batch Operating System: It is very difficult to guess or know the time required by any job to complete. Processors of the batch systems knows how long the job would be when it is in queue Multiple users can share the batch systems The idle time batch system is very less It is easy to manage large work repeatedly in batch systems Disadvantages of Batch Operating System: The computer operators should be well known with batch systems Batch systems are hard to debug It is sometime costly The other jobs will have to wait for an unknown time if any job fails Examples of Batch based Operating System: Payroll System, Bank Statements etc.
Advantages of Time-Sharing OS: Reliability problem One must have to take care of security and integrity of user programs and data Data communication problem Examples of Time-Sharing OSs are: Multics, Unix etc. Advantages of Distributed Operating System: Failure of one will not affect the other network communication, as all systems are independent from each other Electronic mail increases the data exchange speed Since resources are being shared, computation is highly fast and durable Load on host computer reduces These systems are easily scalable as many systems can be easily added to the network Delay in data processing reduces Disadvantages of Distributed Operating System: Failure of the main network will stop the entire communication To establish distributed systems the language which are used are not well defined yet These types of systems are not readily available as they are very expensive.
Advantages of Network Operating System: Highly stable centralized servers Security concerns are handled through servers New technologies and hardware up-gradation are easily integrated to the system Server access are possible remotely from different locations and types of systems Disadvantages of Network Operating System: Servers are costly User has to depend on central location for most operations Maintenance and updates are required regularly Examples of Network Operating System are: Two types of Real-Time Operating System which are as follows: Hard Real-Time Systems: These OSs are meant for the applications where time constraints are very strict and even the shortest possible delay is not acceptable.
These systems are built for saving life like automatic parachutes or air bags which are required to be readily available in case of any accident. Virtual memory is almost never found in these systems. Soft Real-Time Systems: These OSs are for applications where for time-constraint is less strict. Advantages of RTOS: Maximum Consumption: Maximum utilization of devices and system,thus more output from all the resources Task Shifting: Time assigned for shifting tasks in these systems are very less.
For example in older systems it takes about 10 micro seconds in shifting one task to another and in latest systems it takes 3 micro seconds. Focus on Application: Focus on running applications and less importance to applications which are in queue.
Real time operating system in embedded system: Since size of programs are small, RTOS can also be used in embedded systems like in transport and others. Error Free: Question Bank-Module 1. Worked Examples-Module 2. Question Bank-Module 2. Worked Examples-Module 3. Question Bank-Module 3. Worked Examples-Module 4. Question Bank-Module 4. Worked Examples-Module 5.
Question Bank-Module 5. Worked Examples-Module 6.
Question Bank-Module 6. Worked Examples-Module 7. Question Bank-Module 7.
Worked Examples-Module 8. Question Bank-Module 8. Worked Examples-Module 9.
Question Bank-Module 9. Worked Examples-Module Question Bank-Module Test Problems-Module 2. Mini Project-Module 2. Test Problems-Module 3. Mini Project-Module 3. Test Problems-Module 4.
Test Problems-Module 5. Test Problems-Module 6. Mini Project-Module 6.