Functions of operating system 5. protection and security : · another important functions of an operating system is to protect itself from the user process and to protect different users processes from one another in a syatem. · In a multi programming environment, where several users process reside in main memory at the same time, the may interface with OS or with each other. · Thus, protection mechanism controls the access of users, programs and processes used by various applications. · A total approach to computer security involves both external and internal security. 6. Networking: · Networking is used for exchanging information among different computer that are distributed across various location. · Distributed system consist of multiple processors and each processor has its own memory and clock · This results in compu
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What do you mean by operating system? Definition : An operating system is a program that act as an interface between the user of a computer and the Computer hardware. Operating system is a first program that gets loaded into the memory through a process called booting. Concepts of operating system : · The purpose of operating system is to provide an environment in which a user can execute program in a convenient and efficient manner. · Operating system is an integrated set of program that manages the various hardware resources such as processor, memory, I/O Devices , communication devices and overall operation of a computer system. · Operating systems also acts as a platform on which various applications programs such as word processor and excel are executed. · The most common operating system are the window family of operating system (windows 98, window
Operating system as resource manager: · A computer system usually has many hardware and software resources such as processor , memory, disk printer, I/O devices etc. · The task of resources management becomes essential in multi-user operating system where different user compute for the same resource. Operating system manages resources in two ways : 1. Time multiplexing : it defines the sharing of resources on the basis of fixed time slices. For example, the operating system allocate the resources, such as CPUto program A for fixed time slice. 2. Space timing: it defines the concurrent sharing of resources among different programs.for example, sharing of hard disk and main memory is space multiplexing. FUNCTION OF OPERATING SYSTEM The primary function of an operating system is to provide an environment for excecution of users program . the various function of operating system are: 1. process management 2. main memory man
Multi user operating system · In a multi-user operating system, multiple number of user can access different resources of a computer at a same time. · The access is provided using a network that consists of various personal computer attached to a mainframe computer system. diagram of multi -user operating system · The various personal computer can send and receive information to mainframe computer system. · The example of multi-user OS are UNIX, windows 2000,novell netware. single user operating system 2. Multi user operating system 3. Batch processing operating system 4. Multi programming operating system 5. Multi tasking operating system 6. Multiprocessing operating system 7. Time sharing operating system 8. Real time system Advantages of multi user operating system · It helps in the sharing
Batch processing system · Batch processing is one of the oldest method of running the programs · The computer in the past were very large in size and their I/O devices were very different from those that are used today. The job processing was not interactive as it is today. · The user did not interact directly with computer system. · The process scheduling , memory management, file management and I/Omanagement functions are quite simple in batch processing system 1. Process scheduling (i.e. allocation strategy for a processor is typically in order of their arrival i.e. first come first served(FCFS)basis. 2. Memory management is done by dividing the memoryinto two areas one portion or partition is occupied by resident monitor and the other portionis dynamically used to load the transist program for execution. 3. I/O management .since only one program is executed at a time, there is no contention for I/O devic
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