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Operating system is defined as a software program that runs on the system and manages all software and hardware resources of computer. It acts as an interface between the user and computer.
OS is a key component of system software in a system. Nowadays, various OS are available to the users such as Linux, Mac, Windows, etc. OS deals with the several topics viz. process control, Linux forks, Inter process communication, virtual memory, paging, segmentation, Page replacement Algorithms, Scheduling Algorithms, Asynchronous concurrent processes, Concurrent programming, and many more.
It recognises input from the keyboard, sends output to the system’s screen and keep track of files and directories on the disk by controlling peripheral devices. Its structure consists of system components, system services, system calls and system programs.
There are different types of Operating System given as:
- Batch Operating System: the user of batch OS prepared the job on off-line devices because user’ do not communicate with the system directly.
- Network Operating System: it runs on the server and enables the server to manage the various functions of networking, such as data, applications, security, etc.
- Time Sharing Operating System: It is also known as Multi user Operating System as it permits multiple users to access a computer system at different terminals.
- Real time Operating System: it has fixed time constrain and requires minimum interval time to process and respond to an input. It is of two types, including Soft real-time systems and hard real-time systems.
OS covers the interconnection between computer and its devices. It provides a software platform to run the application programs, with OS help programs can run on the system. User can run the application program on any OS but it must be written to run. Two main views of Operating System are User view and System view. Some of the core topics of OS are as follows:
- Problems on Deadlock: deadlock is a situation where all the processes get stuck in a loop and nothing can be done.
- Semaphore: it is the most important concept of OS which is used for sharing the access to files and to share a common memory space
- Files and Database Systems: file systems is a part of OS which is used to keep the track of files in computer system whereas database system not usually a part of OS, it only provides the access to information in a database.
OS performs the various operations to develop the applications:
- In multitasking OS, OS determines the order and time to run the applications.
- OS manages the sharing of internal memory between the various applications.
- It sends the messages about the status of operation to each application and user.
- It manages the division of programs on systems that provides parallel processing, so the program can run on the multiple processor in one time.
Scheduling algorithm is the one of the major concept of OS which is responsible for the CPU time allocation to the process and threads. These algorithms can be preemptive or non preemptive. Main objective of this algorithm is to allocate the CPU time to all tasks. Scheduling algorithm is of six types:
- First-Come, First-Server Scheduling
- Shortest-Job-Next Scheduling
- Priority Scheduling
- Multiple-Level Queues Scheduling
- Shortest Remaining Time
- Round Robin Scheduling
Nowadays, Security is the most important concern of the systems software. Security is mainly concerned with assigning a security system to the resources of computer such as memory, software programs, CPU, information. A computer can be damaged or its data can be lost, if an unauthorized user runs a program on it. We can provide the security to computer systems in following ways:
- One time passwords
- Program threats protection software
- System threats protection software
Distributed Operating System serves the multiple real time applications by using multiple central processors and is an extension of the Network OS. It supports the integration of machines and higher level communication on the network. Some of the most known e.g. of Distributed Operating System are IRIX operating system, Mach OS, DYNIX OS, Solaris OS, AIX OS, etc. it provides the several advantages:
- Speed up Computation
- Resource sharing
Moreover, Virtual Memory Management in OS is responsible for maintaining the copy of the memory on secondary storage for all programs. Paged memory management used the Virtual Memory to provide the demand paging. Some of the pages for a process only reside in the virtual memory. Total number of page faults is responsible for the Performance of Virtual Memory Management. This page faults depends on:
- Frame allocation algorithm
- Page replacement algorithm
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Operating systems have a large number of responsibilities and powers while working within larger systems. It provides a software platform on which programs run ,known as application programs. Operating systems can be
classified on different basis. On the basis of its usage, we have different OS for different systems. Smoe of the Computer OS are Windows, DOS, Linux etc. while mobile OS are android, ios etc.
Its primary goal is to make computer work conveniently and fast. It is used to allocate resources to processes. On the basis of this, operating systems are classified as :
- Multi-user Operating System
- Simple Batch System
- Multiprocessor System
- Multiprogramming Batch System
- Distributed Operating System
- Realtime Operating System
- Multitasking Operating System
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