OS101

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Jas

Cards (26)

  • Operating System (OS)

    A collection of software that manages computer hardware resources and provides common services for computer programs
  • The operating system is a vital component of the system software in a computer system
  • Operating System

    • Interface between a computer user and computer hardware
    • Performs basic tasks like file management, memory management, process management, handling input and output, and controlling peripheral devices such as disk drives and printers
  • Important functions of an Operating System
    • Memory Management
    • Processor Management
    • Device Management
    • File Management
    • Security
    • Control over system performance
    • Job accounting
    • Error detecting aids
    • Coordination between other software and users
  • Memory Management

    1. Keeps tracks of primary memory
    2. Decides which process will get memory when and how much
    3. Allocates the memory when a process requests it
    4. De-allocates the memory when a process no longer needs it or has been terminated
  • Processor Management

    Deciding which process gets the processor when and for how much time
  • Processor Management

    1. Keeps tracks of processor and status of process
    2. Allocates the processor (CPU) to a process
    3. De-allocates processor when a process is no longer required
  • Device Management

    Managing device communication via their respective drivers
  • Device Management

    1. Keeps tracks of all devices
    2. Decides which process gets the device when and for how much time
    3. Allocates the device in the efficient way
    4. De-allocates devices
  • File Management

    1. Decides who gets the resources
    2. Allocates the resources
    3. De-allocates the resources
  • Important activities an Operating System performs
    • Security
    • Control over system performance
    • Job accounting
    • Error detecting aids
    • Coordination between other software's and users
  • Security - By means of password and similar other techniques, it prevents unauthorized access to programs and data
  • Control over system performance - Recording delays between request for a service and response from the system
  • Job accounting - Keeping track of time and resources used by various jobs and users
  • Error detecting aids - Production of dumps, traces, error messages, and other debugging and error detecting aids
  • Coordination between other software's and users - Coordination and assignment of compilers, interpreters, assemblers and other software to the various users of the computer systems
  • Operating System (OS)

    A collection of software that manages computer hardware resources and provides common services for computer programs
  • The operating system is a vital component of the system software in a computer system
  • Memory Management
    Management of Primary Memory or Main Memory. Main memory is a large array of words or bytes where each word or byte has its own address
  • Memory Management
    1. Keeps tracks of primary memory, i.e., what part of it are in use by whom, what part are not in use
    2. In multiprogramming, the OS decides which process will get memory when and how much
    3. Allocates the memory when a process requests it to do so
    4. De-allocates the memory when a process no longer needs it or has been terminated
  • Processor Management
    In multiprogramming environment, the OS decides which process gets the processor when and for how much time. This function is called process scheduling
  • Processor Management
    1. Keeps tracks of processor and status of process. The program responsible for this task is known as traffic controller
    2. Allocates the processor (CPU) to a process
    3. De-allocates processor when a process is no longer required
  • Device Management
    An Operating System manages device communication via their respective drivers
  • Device Management

    1. Keeps tracks of all devices. Program responsible for this task is known as the I/O controller
    2. Decides which process gets the device when and for how much time
    3. Allocates the device in the efficient way
    4. De-allocates devices
  • File Management
    1. Keeps track of information, location, uses, status etc. The collective facilities are often known as file system
    2. Decides who gets the resources
    3. Allocates the resources
    4. De-allocates the resources
  • Important activities an Operating System performs
    • Security - By means of password and similar other techniques, it prevents unauthorized access to programs and data
    • Control over system performance - Recording delays between request for a service and response from the system
    • Job accounting - Keeping track of time and resources used by various jobs and users
    • Error detecting aids - Production of dumps, traces, error messages, and other debugging and error detecting aids
    • Coordination between other software's and users - Coordination and assignment of compilers, interpreters, assemblers and other software to the various users of the computer systems