Operating System
Operating System
Operating System OS
An operating system (OS) is a program that acts as an intermediary between the user of a computer and the computer harware. The purpose of an operating system is to provide an envirnment in which a user can exicute programs in a convenient and effective manner.
Abstract view of a computer system.
A computer system can be devided roughly into four components: the hardware, the operating system, the aplication programs, and the users.
Because an operating system is large and complex, it must be created piece by piece. Each of these pieces should be a well-defineated portion of the system, with carefully defined inputs, outputs, and functions.
Function of OS
Types of Operating System
- Batch Processing Operating System:
- Network Operating System
- Distrinuted Operating System
- Multiprogramming Operating System
Multiprocessing Operating System
An increasingly common way to get major-league computing power is to connect multiple CPUs in a single system. Depending on precisely how they are connected and what is shared, these systems are called parallel computer, multi-computers, or multiprocessing.
Advantage of multiprocessing OS
Disadvantage of multiprocessing OS
Real-Time Operating System
Another type of operating system is a real time system. These systems are characterized by having time as a key parameter.
Advantage of real-time OS
Disadvantage of real-time OS
- Clustered Operating System
- Multithreaded Operating System
Embeded Operating System
Embedded systems run on the computers that control devices that are not generally through of as computers and which do not accept user-installed software.
Typical examples are microwave ovens, TV sets, cars, DVD recorders, traditional phone and MP3 players.
Advantage of embedded OS
Disadvantage of embedded OS
Dual Mode Operating System
System Calls
- Process control and managment
- File managment
- Device managment
- Memory managment
- Inter process communcation
Operating-System Structure
- Simple Structure
- Layered Approach
- Microkernels
- Monolithic
- Reentrant
See Also