Functions of OS

Functions of OS: 
1. Booting: Booting is a process of starting the computer operating system starts the computer to work. It checks the computer and makes it ready to work.
2. Memory Management:It is also an important function of operating system. The memory cannot be managed without operating system. Different programs and data execute in memory at one time. if there is no operating system, the programs may mix with each other. The system will not work properly.
3. Loading and Execution: A program is loaded in the memory before it can be executed.
4. Data security: The operating system protects the data stored on the computer from illegal use, modification.
5. Resource Management: processes that manage peripherals such as printer, mouse, keyboard, monitor, camera, network hardware, wifi, etc.
6. Memory Management: physical and virtual memory allocation is under the management of the OS and the kernel specifically. 
7. UI: How to get data into and out of the machine, text, visuals, network I/O.
8. Application Management: launch, start, stop, suspend, timeout, timeshare, user and system programs.
9. File Management: An operating system looks after the file management of the whole system. All files are sorted as per their i-node number. The information about these i-nodes are kept in i-node table and so on. Information about each and every file is available in root directory.
10. Process Management: Whenever a file is executed, it becomes a process. Similarly the process management and execution is one of the important works of OS.
11. CPU Scheduling: The scheduling of process calls and setting them as per priority are also done by OS.
12. Hardware Abstraction: To avoid any damages due to runtime failures to hardware, abstraction layer is also done by OS.

Operating Systems: covered following topics in Operating Systems.
    A list of Video lectures
    Python Programming ↓ 👆
    Java Programming ↓ 👆
    JAVA covered following topics in these notes.
    JAVA Programs
    Principles of Programming Languages ↓ 👆
    Principles of Programming Languages covered following topics in these notes.

    Previous years solved papers:
    A list of Video lectures References:
    1. Sebesta,”Concept of programming Language”, Pearson Edu 
    2. Louden, “Programming Languages: Principles & Practices” , Cengage Learning 
    3. Tucker, “Programming Languages: Principles and paradigms “, Tata McGraw –Hill. 
    4. E Horowitz, "Programming Languages", 2nd Edition, Addison Wesley

      Computer Organization and Architecture ↓ 👆

      Computer Organization and Architecture covered following topics in these notes.

      1. Structure of desktop computers
      2. Logic gates
      3. Register organization
      4. Bus structure
      5. Addressing modes
      6. Register transfer language
      7. Direct mapping numericals
      8. Register in Assembly Language Programming
      9. Arrays in Assembly Language Programming


      1. William stalling ,“Computer Architecture and Organization” PHI
      2. Morris Mano , “Computer System Organization ”PHI

      Computer Network ↓ 👆
      Computer Network covered following topics in these notes.
      1. Data Link Layer
      2. Framing
      3. Byte count framing method
      4. Flag bytes with byte stuffing framing method
      5. Flag bits with bit stuffing framing method
      6. Physical layer coding violations framing method
      7. Error control in data link layer
      8. Stop and Wait scheme
      9. Sliding Window Protocol
      10. One bit sliding window protocol
      11. A protocol Using Go-Back-N
      12. Selective repeat protocol
      13. Application layer
      1. Andrew S. Tanenbaum, David J. Wetherall, “Computer Networks” Pearson Education.
      2. Douglas E Comer, “Internetworking with TCP/IP Principles, Protocols, And Architecture",Pearson Education
      3. KavehPahlavan, Prashant Krishnamurthy, “Networking Fundamentals”, Wiley Publication.
      4. Ying-Dar Lin, Ren-Hung Hwang, Fred Baker, “Computer Networks: An Open Source Approach”, McGraw Hill.