Introduction to Operating System | Kernal and User Mode| OS Functions | Easy Learning IT Classroom
What is an Operating System?
An operating system is system software that manages computer hardware and software resources and provides common services for computer programs.
Flavours of OS;
Windows, Linux, Mac, Android etc.
- Kernel: is a core component of an operating system. When an operating system is loaded into memory the kernel loads first and remains in the memory until the OS is shut down again.
- Kernel is known as the Nucleus/Core of Operating system.
- Kernel mode is generally reserved for the lowest-level, most trusted functions of the operating system. Crashes in kernel mode are catastrophic; they will halt the entire PC. In User Mode, the executing code has no ability to directly access hardware or reference memory.
- Operating System = Kernel + User (Shell)
- User interfaces are only seen to users.
-An operating system is the most important software that runs on a computer. It manages the computer's memory and processes, as well as all of its software and hardware. It also allows you to communicate with the computer without knowing how to speak the computer's language.
- Layered architecture
- An application could be Microsoft office.
- The operating system could be WINDOWS, LINUX, MAC, ANDRIOD etc.
- Decrease complexity, how? What if there is no operating system. What user will do at that time?
- User have to write a program with every function or task s/he does, that program will communicate with the hardware.
- Hardware represents the motherboard and its components.
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C++ tutorials playlist -
https://www.youtube.com/playlist?list=PLhmA3HN6Mpp1Ab_MqrMljkkFVSz68-gzv- Best from C++ Playlist
Different star patterns using for loop in C++ | Triangle Shapes | Coding | Easy Learning IT Classroom –
https://youtu.be/TzzAVzRWq_kPalindrome Number Program in C++ (HINDI/URDU) | Coding | Easy Learning IT Classroom -
https://youtu.be/6lvZNVxi9goLecture 7 - Character Arrays in C++ | Part 4(a) | Easy Learning IT Classroom -
https://youtu.be/0dg2Rp8OO-IDifference Between For, While, Do-while loop in C++ (Hindi/Urdu) | Easy Learning IT Classroom -
https://youtu.be/TjQkwZk50DUInline Functions in C++ (HINDI/URDU) | Easy Learning IT Classroom -
https://youtu.be/RsqmGWr7acc-------------------------------------------------------------------------------------------------
Theory of Computation or Automata Theory tutorials playlist -
https://www.youtube.com/playlist?list=PLhmA3HN6Mpp3G-onZAnI6lOgSyEeZlCdZ- Best from Theory of Automata:
Introduction to Push-Down Automata | Need of PDA | PDA Elements | Easy Learning IT Classroom -
https://youtu.be/4nkkjJeFl5kPushdown Automata for a^nb^mc^m+n where m and n are natural numbers | Easy Learning IT Classroom -
https://youtu.be/qeyZZvXdcxUPushdown Automata for a^mb^2mc^n where m and n are natural numbers | Easy Learning IT Classroom -
https://youtu.be/qnn83_aWNI0-------------------------------------------------------------------------------------------------
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© 2019 Easy Learning, All Rights Reserved.
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Please watch: "Vmware and Redhat | Downloading + Installation | Complete video tutorial | Easy Learning Classroom"
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