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CUW 125th academic year

CUW 125th academic year. CSC 350 - Operating Systems. 0. Course Framework. ‘Fun Facts’ about OS name some OSs what do you know about OSs?. CSC 350 - Operating Systems. Why learn OS?. - understand OS to become a power user. CSC 350 - Operating Systems. Why learn OS?.

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CUW 125th academic year

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  1. CUW 125th academic year

  2. CSC 350 - Operating Systems 0. Course Framework • ‘Fun Facts’ about OS • name some OSs • what do you know about OSs?

  3. CSC 350 - Operating Systems Why learn OS? • - understand OS to become a power user

  4. CSC 350 - Operating Systems Why learn OS? • - create better applications as you understand OS I/F

  5. CSC 350 - Operating Systems Why learn OS? • - OS demonstrates fundamental CS concepts in practice

  6. CSC 350 - Operating Systems Why learn OS? • - understand and appreciate design tradeoffs

  7. CSC 350 - Operating Systems Why learn OS? • - modeling and simulation

  8. CSC 350 - Operating Systems Why learn OS? • - systems programming

  9. CSC 350 - Operating Systems

  10. CSC 350 - Operating Systems I. OS Overview • A. Systems Software • What is software?

  11. Layers of Software Application Packages Programming Languages Systems S/W H/W

  12. Systems Software 1. Booting S/W • Start-up Instructions

  13. Systems Software 2. Translation S/W • Convert HLL into ML

  14. Systems Software 3. OS • focus of CSC 350

  15. Systems Software Systems Software • Looks “inward” • Manage System Resources

  16. OS Overview B. Operating System (OS) • Master Control S/W • Goal: control and manage the H/W and other S/W of the system

  17. OS Overview B. Operating System (OS) Examples … • Windows, • MacOS, • UNIX, …not the Ethiopian eunuch of Acts 8 :-)

  18. OS Overview 1. Command Interpreter • a. OS Commands “built -in” • b. Executables “added applications”

  19. OS Overview Windows File Extension • identifies type of file • Executables (ML) - .exe

  20. OS Overview Windows File Associations • Associates a data file extension with its application

  21. OS Overview When a data file is “double-clicked,” OS will • 1. Run associated application • 2. Load data file into application

  22. OS Overview • OS “data centric” view …{double-edged sword} System A- Codewarrior- File Association System B- no Codewarrior- no OS association

  23. OS Overview • OS “data centric” view …{double-edged sword} Viruses which exploit the “tight coupling” of applications and data to the OS

  24. CSC 350 Operating Systems

  25. OS Overview 2. Interface (H/W - S/W) • Applications can not work with H/W directly • Why? • - easier programming • - protect from bugs

  26. OS Overview 3. Resource Manager • most complex job

  27. OS Overview Computer System: • Small =

  28. OS Overview Computer System: • Small =

  29. OS Overview • Large = Processor & Storage Terminals (I/O)

  30. OS Overview OS must manage the use of … • scarce resources

  31. OS Overview Because 1 CPU can only do 1 thing at a time*: • 1 CPU can only serve ... • 1 user at a time * A convenient fiction for right now :-)

  32. OS Overview CPUs are not omnipresent • but God is: • “Can anyone hide in secret … do not I fill heaven and earth declares the LORD?” Jeremiah 23:24

  33. OS Overview a. Multi-Tasking • Scarce resource is CPU • Trick which gives the appearance of multiplesimultaneous usage

  34. OS Overview (i) each user gets a small portion of time to use the CPU • (ii) CPU executes during the time slice

  35. OS Overview (iii) OS puts application on “hold” • (iiii) Process continues in a Round Robin fashion

  36. OS Overview b. Virtual Memory • Scarce resource is memory • Trick which gives the appearance of unlimited RAM memory

  37. OS Overview C. User Perspective • 1. environment • 2. effective use

  38. CSC 350 Operating Systems Assignments • - wassn0email by tomorrow • - wassn1due Thursday

  39. Zeb & Zeke …

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