OS(1) basic

OS services functions

  • User Interface
  • Program execution
  • I/O operatings
  • File-system manipulation
  • Communications(between processes)
  • Error detection

others

  • Resource allocation
  • Accounting
  • Protection and security

Process(Unit of work)

5 states

  • New
  • Running
  • Waiting
  • Ready
  • Terminated