An direct formation (OS) is a set of programs that manages estimator hardware resources, and provides common services for application software. The operating dodge is the most important type of system software in a computer system. Without an operating system, a user cannot cannonball along an application program on their computer, unless the application program is ego booting.
Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting for cost allocation of mainframe time, mass storage, printing, and other resources.
For hardware functions such as stimulus and output and memory allocation, the operating system acts as an go-between between application programs and the computer hardware,[1][2] although the application code is ordinarily executed directly by the hardware and will much call the OS or be interrupted by it. Operating systems are found on almost each device that contains a computerâ€"from cellular phones and video back up consoles to supercomputers and web servers.
Examples of popular modern operating systems include Android, iOS, Linux, mack OS X and Microsoft Windows.
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Contents
 Types
 Summary
 History
o  Mainframes
o  Microcomputers
4Â Examples of operating systems
o  Unix and Unix-like operating systems
? Â BSD and its descendants
? Â Mac OS X
?
? Â Linux and GNU
? Â Program execution
? Â Interrupts
? Â Modes
? Â retention management
? Â Virtual memory
? Â Multitasking
? Â Disk access and file systems
? Â Device drivers
o  Networking
o  Security
o  User interface
? Â Graphical user interfaces
Types
Real-time
A real-time operating system is a multitasking operating system that aims at executing real-time applications. Real-time operating systems a lot use specialized scheduling algorithms so that they can bring home the bacon a deterministic nature of behavior. The main...If you want to get a full essay, order it on our website: Orderessay
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