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The Operating System

The Operating System. By J. W. Rider 2 September 2003. A working definition. Software (program and/or data)… … initializes hardware components … interface with users and/or programs … manage program execution Examples:

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The Operating System

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  1. The Operating System By J. W. Rider 2 September 2003

  2. A working definition • Software (program and/or data)… • … initializes hardware components • … interface with users and/or programs • … manage program execution • Examples: • CP/M, DOS, Univac Exec, Genie, Linux, MacOS, MS Windows, Multics, OS, p-System, Share/7, Solaris, Tenex, T.H.E., TOPS, Unix, VMS

  3. Tip of the Iceberg • Most users might think of the OS as just what they can see… • But, most of the OS proper is hidden out of sight.

  4. Systems existed before the OS • Originally, computer systems were designed for a specific purpose. One computer; one application. App App App App

  5. Reusable computer systems • General-purpose computers made programming a separate discipline. One computer; many applications. App App App App

  6. The OS makes distributed software practical • The advent of the OS made application and systems programming separate disciplines. Application OS OS

  7. Parts of the OS • Kernel • The barest essential code • Services • Device drivers • Application Programming Interface (API) • Shell • What the user sees

  8. OS Features • Task scheduling • Input/output functions • Library routines • Named file system • Logging • Multiuser, multitasking, multithreading • Memory management

  9. OS “Package” • OS Proper • Other system software • Optional hardware drivers • Development software • Backup and recovery • Other application software • Word processing • Data-base management

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