Chapter 1: Operating System Introduction

• components: hardware, OS, app, users
  • hardware: provide basic computing resources
  • OS: controls and coordinates the use of hardware/resources among apps
  • app: solve the computing problems
• OS
  • permanent software, such as abstract of hardware for app to use
  • Resource allocator: manage and allocate resources to insure efficiency and fairness
  • Control program: controls execution of programs and operation of I/O devices to prevent errors
  • Kernel: the one program running at all times (in supervisor mode)
• Goals: Convenience and Efficiency -- contradictory

• the only interface between user app and hardware
• cannot allow any bug

Computer System Organization