Operating System
Operating system acts as an inter between the user and hardware of the computer and also control the execution of application program , operating system is also called as resource manager, makes sure every thing works together.
operating system is a system that acts as abridge between computer hardware and user . It control all the hardware components of the computer CPU memory storage ,input/output devices
Different types of Operating system
1.Batch operating System
2.Milti- programmed operating system
3.Multitasking operating system
4.Multiprocessor system
5.Distributed system
6.Real Time system
7.Mobile OS(Android OS)
1.Batch Operating system
.It is one of the oldest operating system . Batch operating system is one where program and data are collected together in a batch before processing starts
.A job is predefined sequence of command program and data that are combined in to single unit called job. memory management in batch system is very simple
.Memory is usually divided into two area namely operating system and user program area. This operating system class not permit the user to interact with executing program
2.Multi-Programmed Operating System
.Multi-programming is required to support multiple process since multiple processor are resident in memory at the same time , increase processes utilization if the process
.Multi-programming is a technique to execute number of program by a single processor .in a non-Multi-programming system the CPU would sit
3.Multitasking operating system
Task mean a process in execute ,A CPU handing multiple task at a time known as multitasking .
Multitasking operating system can handle multiple task together by applying Multi-programming ,A instance of a program in execute is called process or task
It convert users command into learning machining language and make the hardware understandable and given the hardware output back in human readable form
Need of Operating system
1.Memory management: Allocates and ram the process 2.Device management: Input/output controls an devices keyboard key ,like printer
3.process management: Handle running program multitasking , CPU
4.User management: provides a way for user to interface with the system
5.File management: create read writes and organizes files and storage
6.Security and access control: Protects data and prevent unauthorized access
.If the computer is a facture then the OS it is manager which allocates work manages the use of resources and delivers the results of the work to the user
.Importance of operating system .Without OS, computer is just o box hardware which cannot do anything
.Without OS, every program has to be written directly for har dware ,which is almost impossible. OS provides a platform where we can run applications
.Short Diagram to understand
[User ]
[Application Software ]
[Operating system ]
[Hardware]
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