OPERATING SYSTEM

An operating system (OS) is software that manages computer or device hardware resources and provides a platform for running applications. It acts as an intermediary between hardware and user level applications.

There are several types of operating systems and they are as follows; single user single tasking (SUST), single user multi-tasking (SUMT), multi-user, real time (RTOS), distributed and mobile operating systems.

Single user single tasking (SUST) operating systems have one user and one task at a time. They are simple efficient and utilize very low resource usage. However they have limited functionality and do not multi-task. They find use as operating systems for embedded systems and simple devices. Examples includes Ms-DOS, palm OS etc.

Single user multi-tasking (SUMT) operating systems have one user and perform multiple tasks simultaneously. Their use results in improved productivity and efficient resource usage. However they have limited security and have no multi-user support. They are used for personal computers and work stations. Examples includes windows OS, mac OS etc.

Multi-user operating system entertains multiple users and performs multiple tasks simultaneously. They have high security, multi-user support and are scalable in their application.  However, they are very complex and resource intensive. They are used for servers, main frames, super computers etc. examples includes UNIX, LINUX, windows server etc.

Real-time operating systems (RTOS) are very predictable in their operation and responds timely to events. They are highly reliable, have low latency and very predictable. However they have limited flexibility and are very complex to develop. They are used in embedded systems, robotics, industrial controls etc. examples includes VxWorks, QNX, Lynx OS, ROS etc.

Distributed operating systems are employed to control the resources of multiple computers and coordinate their tasks. They are scalable, fault tolerant and have high performance. They are complex and difficult to manage. They are used in cloud computing, grid computing, supercomputing etc. examples includes Amoeba, Plan 9, Google’s distributed OS etc.

Mobile operating systems are designed specifically for mobile devices. They are touch friendly, mobile specific features and have an apps ecosystem. However they have limited multi-tasking and security concerns. They find applications in mobile devices, tablets, wearable etc. examples includes android, ios, windows phone etc.

The basic  function of an operating system are as follows; process management, memory management, file system management, input/output (I/O) management, security, interrupt handling, resource allocation, networking, user interface and error handling.

In its process management function, the OS manages processes, allocating resources like CPU time, memory and I/O devices. It handles process creation, scheduling and termination.

In its memory management function the operating system manages memory allocation and de-allocation for running programs, ensuring efficient use of RAM and preventing memory conflicts.

In its file system management function the operating system provides a file system to store and manage files, allowing programs to read and write files to storage devices like hard drives or solid state drives.

In its input/output (I/O) management function, the operating system manages input/output operations between devices like keyboards, mice, displays and storage devices.

In its security function the operating system provides mechanisms for controlling access to computer resources such as user authentication, access control and encryption.

In its interrupt handling function the operating system handles interrupts generated by the hardware devices, such as keyboard presses or disk completion.

In its resource allocation function the operating system manages resource allocation ensuring that multiple programs can run simultaneously without conflict.

In its networking function the operating system manages network communication, allowing devices to communicate with each other and share resources.

In its user interface function the operating system provides a user interface such as a command line interface (CLI) or a graphical user interface (GUI) to interact with the computer or device.

In its error handling function the operating system provides error handling mechanism such as error messages and exception handling to handle unexpected events and errors.

The advantages of operating systems are as  follows; operating systems manages processes, ensuring efficient use of CPU resources. Operating systems manages memory ensuring efficient use of RAM. Operating system provides a file system making it easy to store and retrieve data. Operating system provides security features such as user authentication and access control. Operating system provides a layer of abstraction between hardware and applications.

The disadvantages of operating systems are as follows; operating systems can be complex making it difficult to develop and maintain. Operating system requires resources such as CPU and memory which can impact performance. Operating system can be vulnerable to security threats such as malware and viruses. Operating systems may not be compatible with all hardware or software configurations.

The application of operating system is as follows; operating system is used in desktops computers to manage hardware resources and run applications. Operating systems is used in mobile devices such as smart phones and tablets to manage hardware resources and run applications. Operating systems is used in servers to manage hardware resources and provide services to clients. Operating systems is used in embedded systems such as traffic lights and appliances to manage hardware resources and perform specific tasks.

The future of operating system is based on the advances and development of the following technologies; operating systems will integrate artificial intelligence capabilities to improve performance and security. Operating system will be designed to work seamlessly with cloud computing services. Operating system will be designed to manage internet of things devices and provide a unified platform for internet of things computing. Also operating system will in future have a standard framework for robot operating system to improve their deployed time and capabilities. Operating systems in the future will prioritize security features such as advanced threat detection and encryption.

 

SOURCES:

• Operating systems: Three easy pieces by Remzi H. Arpaci-Dusseau and Andrea C. Arpaci-Dusseau.
• Operating system concepts by Abraham Silberschatz, Peter B. Galvin and Greg Gagne.
• Modern operating systems by Andrew S. Tanenbaum.
• Writing a simple operating system from scratch by Nick Blundell.
• Distributed operating systems: concepts and design by Pradeep K. Sinha.