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Understanding Operating Systems: Unveiling the Hidden Backbone of Computer Systems

Explore the essential definitions, history, and features of Operating Systems (OS) in this detailed guide. From the role of the OS in managing hardware and software interfaces to its hidden complexities, discover the crucial components that make up the OS "package." Learn about the kernel, services, APIs, and how the OS facilitates multitasking, multiuser functionality, and memory management. Gain insights into the evolution of computer systems and the impact of OS on software development and system efficiency.

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Understanding Operating Systems: Unveiling the Hidden Backbone of Computer Systems

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Presentation Transcript

  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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