1 / 20

Operating Systems

Operating Systems. Who’s in charge in there?. Types of Software. Application Software : Does things we want to do System Software : Does things we need done Low level details. Operating System. Operating System : Software that manages the operation of a computer

kalkin
Télécharger la présentation

Operating Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Operating Systems Who’s in charge in there?

  2. Types of Software • Application Software : Does things we want to do • System Software : Does things we need doneLow level details

  3. Operating System • Operating System : Software that manages the operation of a computer • Not all computational systems have an OS • Early computers • Embedded systems

  4. Varieties of OSes • Batch • Submit list of jobs

  5. Varieties of OSes • Interactive • Single user single task • Single user / multitask • Multiuser

  6. Operating Systems • PC Operating Systems • Windows • *nix • Linux • MacOS X

  7. Operating Systems • Phone OSes • iOS • Android • Windows • Palm

  8. Varieties of OSes • Real Time / Dedicated

  9. What do they do? • Manage hardwareresources • Provide an abstraction • Allocate scare resources

  10. Abstraction • API : Application Programming Interface • Set of functions software can do • OS API Features • Functions (blocks) to • Read files • Use a network • Draw windows • Get mouse position

  11. Resource Scarcity • Resources scarce in • Time • Processor • IO / Disk • Space • Memory • Disk

  12. Resources - Processes • OS manages what process(es) are running • Interrupts cause operating system to grab control • Timer • Hardware signalsthat data is ready http://faculty.chemeketa.edu/ascholer/cs160/VTCS0/OS/Lessons/Processes/index.html

  13. Resources - Processes • Processes Challenge: • Lots of incoming jobs, how do you determine how to handle them? • Shortest job first? • Round robin?

  14. Resources - Processes • Processes Challenge: • Lots of incoming jobs, how do you determine how to handle them?

  15. Resources - Memory • Memory : Where running programs & data are stored

  16. Virtual Address Space • Application memory scattered all over • Virtual address space makes it look clean to application

  17. Resources - Memory • Memory is a hierarchy

  18. Resources - Memory • Constant shuffle between levels • CPU registers have some information • Cache has a larger set • Main memory has a bigger set • The disk has everything else

  19. Resource Abstraction • Hard Drive workings: http://www.youtube.com/watch?v=kdmLvl1n82U&feature=related • What a programmer wants • Open the file called "essay.doc"

  20. Resources - IO • Keyboard, Monitor, Network, Printer… • Mange flow of information • Maintain buffers • Handle hardware interrupts • Provide application access

More Related