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CSE111: Great Ideas in Computer Science

CSE111: Great Ideas in Computer Science. Dr. Carl Alphonce 219 Bell Hall Office hours: M-F 11:00-11:50 645-4739 alphonce@buffalo.edu. Announcements. Exam 1 handback Exam 1 solution will be posted this week Continue working on HW2. Today’s Agenda. Start chapter 3 (Operating Systems).

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CSE111: Great Ideas in Computer Science

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  1. CSE111: Great Ideas in Computer Science Dr. Carl Alphonce 219 Bell Hall Office hours: M-F 11:00-11:50 645-4739 alphonce@buffalo.edu

  2. Announcements • Exam 1 handback • Exam 1 solution will be posted this week • Continue working on HW2

  3. Today’s Agenda • Start chapter 3 (Operating Systems)

  4. cell phones off (please)

  5. Can you name an operating system?

  6. Can you name an operating system? • Windows (7, Vista, XP, …) • Mac OS-X

  7. Can you name an operating system? • Windows (7, Vista, XP, 2000, …) • Unix-like (Mac OS-X, Linux, Unix, BSD, …) • MVS • TOPS-10/TOPS-20 • VAX/VMS • DOS • Windows-CE/Windows Mobile • PalmOS/Palm WebOS • BlackBerry OS • Symbian OS (on most cell phones) • Andriod (Linux-based) • For more, see for example: • http://en.wikipedia.org/wiki/List_of_operating_systems

  8. What is role of an OS?

  9. What is role of an OS? • Provide basic services • Load and execute a program • Talk to printer or hard drive • Communicate via network

  10. Single-user batch system • One job at a time • No interactive computing • All data must be available up-front

  11. Multi-user multi-tasking • OS switches between processes • Each process gets to compute for a short period of time • Gives impression of many programs running at the same time

  12. Hierarchy of software • User-level applications • System utilities • User-interface to operating system kernel (window manager, shell) • Kernel

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