OPERATING SYSTEM NOTES (ALTERNATIVE)
Operating systems (OS)
How the operating system works
For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed
directly by the hardware and will frequently make a system call to an OS function or be interrupted by it. Operating systems can be found on almost any device that contains a computer—from cellular phones and video game consoles to supercomputers and web servers.
Operating system types
As computers have progressed and developed so have the operating systems. Below is a basic list of the different operating systems and a few examples of operating systems that fall into each of the categories. Many computer operating systems will fall into more than one of the below categories.
Single program OS
Single program OS-also known as single tasking OS allows processing of one application program in the main memory at a time. Below are some examples of single program operating systems.
Multitasking- An operating system that is capable of allowing multiple software processes to run at the same time. Below are some examples of multitasking operating systems.
Single user OS
Single user OS-is designed for use by only one person. Below are some examples of single user operating systems.
Multi-user- A multi-user operating system allows for multiple users to use the same computer at the same time and different times. Below are some examples of multi-user operating systems.
Multiprocessing- An operating system capable of supporting and utilizing more than one computer processor. Below are some examples of multiprocessing operating systems.
Multithreading- Operating systems that allow different parts of software program to run concurrently. Operating systems that would fall into this category are:
GUI- Short for Graphical User Interface, a GUI Operating System contains graphics and icons and is commonly navigated by using a computer mouse. Below are some examples of GUI Operating Systems.
Menu-driven- provides the user with a list of options to choose from. Example: Dos shell/Dos editor
Command-line- lets the user type command at a prompt. The computer reads the typed command from the command line and executes it. Example: Ms Dos
Functions of operating systems in resource management
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