System Structure

• An operating system is usually large and complex. Therefore, it should be engineered carefully. Possible ways to structure an operating system:
  • Simple, single-user, MS-DOS,MacOS, Windows
  • Monolithic, multi-user, UNIX,Multics, OS/360
  • Layered,T.H.E. operating system
  • Virtual machine, IBM VM/370
  • Client/Server (microkernel), Chorus/MiX

Figure 7: OS Structures, MS-DOS, Unix, IBM VM/370, Chorus