Functions of Operating System

An operating system is like the manager of a computer – it oversees the computer's hardware and serves as a bridge between the user and the machine. The primary function of an operating system is to allocate resources and services, encompassing memory, processors, hardware, and data. 

• It incorporates I/O programs, a file system, a scheduler, a traffic controller, a memory management module, and various tools for overseeing these resources. 
• Acting as software, the operating system governs the allocation of computer hardware.

Key Terms: Function, I/O Program, Floppy Disks, Hard Disks, Pen Drives

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What Is an Operating System?

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An operating system is like the manager of a computer – it oversees the computer's hardware and serves as a bridge between the user and the machine. 

• Its primary role involves distributing resources like memory, devices, processors, and data. 
• The operating system has various programs, including a traffic controller, scheduler, memory management module, I/O programs, and a file system, to handle these resources efficiently. 
• The operating system creates a space where other programs can operate effectively.

Operating System

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Functions Of Operating System

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Some of the major functions of the operating system are mentioned below. 

Memory Management

The operating system is responsible for managing the Primary Memory, also known as Main Memory. In this type of memory, every byte or word possesses a unique address within a sizable array. Main memory serves as rapid storage that the CPU can promptly access. Before a program can be executed, it needs to be loaded into the main memory. The operating system performs several tasks to oversee memory:

• It monitors the primary memory, keeping track of the amount of memory each user program is utilizing.
• It manages the addresses of both assigned and available memory.
• In a multiprogramming environment, the operating system determines the sequence and duration of memory access for each process.
• When a process requests memory, the operating system allocates the necessary memory for that process. 
• Upon completion of the process or during I/O activities, the operating system deallocates the assigned memory.

Memory Management

Processor Management

In a multi-programming setting, the OS determines the sequence in which processes access the processor and the duration of processing time allotted to each. This function is termed Process Scheduling. Processor Management by an Operating System involves the following activities:

• The OS oversees the processor's workload by assigning diverse tasks to it and ensuring that each process receives sufficient processing time for proper functioning.
• It monitors the status of processes, with a specialized program known as a traffic controller performing this task.
• The OS assigns the CPU (processor) to a process.
• It deallocates the processor when a process is no longer required.

Device Management

Operating systems play crucial roles in overseeing the operation of devices linked to a computer. These responsibilities encompass assigning memory, handling input and output tasks, and overseeing storage devices. These devices may range from keyboards and mice to printers and various other connected peripherals.

• Through an operating system, users gain the ability to customize the behavior of each device. 
• For instance, it allows users to configure their keyboard for typing in a particular language or to specify that the mouse moves across the screen one step at a time.
• Furthermore, operating systems offer functionalities for installing software and updates related to devices, as well as for maintaining their security settings.

File Management

The operating system oversees the distribution and retrieval of resources, determining which process is granted access to a file and the duration of that access. 

• Additionally, it maintains records of details such as information, location, usage, and status. 
• These resource categories are commonly known as file systems, and files within a system are organized into various directories.

Storage Management

Files serve as repositories for data storage, and an operating system enables the creation, modification, updating, and deletion of these files. Moreover, it facilitates the seamless transfer of files between devices. Files, considered as the tangible entities stored on hardware, are managed by the operating system.

• Directories play a crucial role in organizing a file system and enhancing navigation and usability. 
• These directories may contain subdirectories and files. 
• The operating system is responsible for several file management tasks, including monitoring information storage locations, managing user access preferences, and overseeing file status. 
• In a broader sense, the term "file system" encompasses these resources.

System Performance

Operating systems have a crucial role in managing and enhancing system performance. They serve as intermediaries between hardware and software, ensuring effective utilization of computing resources. 

• A key aspect is the allocation of resources, where the OS assigns CPU time, memory, and I/O devices to various processes, aiming for equitable and optimal resource usage. 
• Process scheduling, a critical function, determines the order in which processes or threads run, preventing any one task from dominating the CPU and facilitating efficient multitasking.

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Services Provided by an Operating System

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The Operating System offers various services to users, which can be outlined as follows:

User Interface

Operating systems typically feature a User Interface (UI) that may come in different forms.

• This can include a Command-Line Interface (CLI), where text commands are entered via a keyboard, or a Batch Interface, where commands are placed in files for execution.
• A commonly used graphical option is the Graphical User Interface (GUI), incorporating windows, a pointing device for input, and a keyboard for text entry.

Program Execution

The OS is accountable for executing all types of programs, whether user-based or system-oriented. It efficiently utilizes available resources to ensure the smooth execution of various functionalities.

Handling Input/Output Operations

The OS manages diverse inputs from devices like keyboards, mice, and desktops. It handles interfacing for different Input and Output operations, recognizing distinctions between various peripheral devices.

Manipulation of File System

The OS makes decisions regarding the storage and manipulation of data or files, encompassing devices like floppy disks, hard disks, or pen drives.

Resource Allocation

Ensuring efficient resource utilization, the OS determines which resource is allocated to which task and for how long.

Accounting

The OS maintains a record of all activities within the computer system, including error details and other functionalities occurring simultaneously.

Information and Resource Protection

The OS safeguards information and resources, thwarting external attempts to compromise data integrity.

Communication

The operating system facilitates communication between processes, whether they are on the same computer or different systems connected through a network.

System Services

The OS provides various system services, encompassing functions like printing, time and date management, and event logging.

Error Detection

Constantly monitoring for errors, the OS identifies and addresses issues in CPU and memory hardware, I/O devices, and user programs. Appropriate actions are taken to ensure accurate and consistent computing in response to each type of error.

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Things to Remember

• The operating system allocates resources, including CPU time, memory, and I/O devices, to various processes.
• The operating system supplies interfaces for user interaction, such as command-line, graphical, and batch interfaces.
• The operating system manages the execution of user and system programs, ensuring optimal use of resources.
• It safeguards information and resources, preventing unauthorized access and external threats.
• The operating system facilitates communication between processes within a computer or across a network.
• The operating system monitors for errors in hardware, I/O devices, and user programs, taking necessary actions.
• The operating system provides system-level services, encompassing printing, time management, and event logging.

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