Managing reasources

• What is a operating system?


  Software that manages a computer system. Loaded by the bootstrap loader. One of its primary functions is to manage resources.
• Managing peripherals such as input and output devices


  • Communicates with and sends data output to a printer/monitor/other valid output device
  • Communicates with and receives data input to a keyboard/mouse/other valid input device
• Managing printing using spooling


  • Data is stored on a hard disk/in memory/stored in a queue.
  • Document is printed when printer is free/in correct order.
  • Benefit of spooling – user can carry on working/log off when waiting for job to print.
• Managing backing store


  • Ensures data is stored and can be retrieved correctly from any disk drive
  • Creates and maintains filing system such as file allocation table (FAT) or new technology file systems (NTFS).
  • Organises files in a hierarchical directory structure.
• Managing RAM


  • Ensures that programs/data do not corrupt each other.
  • Ensures that all programs and data, including itself, are stored in correct memory locations.
• Managing processes


  • Ensures that different processes can utilise the CPU and do not interfere with each other or crash.
  • On a multi-tasking O/S, ensures that all tasks appear to run simultaneously.
• Managing security


  • Allows creation and deletion of user accounts.
  • Allows users to login and change passwords.