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Operating Systems (OS), ALEND HARRICK LUKAS 73318 - Coggle Diagram

- - - - Monitors every device, channel and control unit
      - Choose the most efficient way to allocate all of the system's devices, printers, ports, disk drives, etc. based on the scheduling policy
      - Allocating each resource, starting its operation and finally deallocating the device making it available to the next process or job
    - - Data files, program files, compilers, application
      - Enforces restrictions on who has access to which files by using predetermined access policies
      - Keeps track of every file in the system
      - Controls what users are allowed to do with files once they access them
      - Manages access control
      - Allocates the necessary resources and later deallocates them
    - - Keeps track of the status of each process
      - Monitors whether the CPU is executing a process or waiting for a
        READ/WRITE command to finish execution
      - Decides how to allocate the CPU
      - Like a traffic controller, the CPU handles the processes’ transition from one
        state of execution to another
      - 2 levels of responsibility
        
        Handle jobs as they enter the system – handled by Job Scheduler (accepts or rejects the incoming job)
        
        Manage each process within those jobs - handled by Process Scheduler (decides which process gets the CPU and for how long)
    - - Responsible for all networking tasks
      - Provides a convenient way for users to share resources while controlling users' access to them
    - - Allocates a portion of the memory that is not already in use
      - Deallocates memory when it's time to reclaim the memory
      - Checks validity of each request for memory space
      - Protects the space in main memory occupied by the OS
      - In charge of main memory
      - In multiuser environment, sets up table to track memory usage
- - - - Supports 1 user
      - General
      - Runs program such as MS Office, computer games, web browsing, checking email etc.
      - Cheaper
    - - Supports multiple/unlimited user connections
      - Custom for a company’s specification
      - Expensive
      - Serve the requests of client computers on the network. Can act as web/database/email server