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Operating Systems SERVICES

Operating Systems SERVICES. BARNALI CHAKRABARTY. What is an Operating System ?. Features of Operating System. Multi user Multiprocessing Multitasking Multithreading Real time. Classification of Services [Chow07].

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Operating Systems SERVICES

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  1. Operating SystemsSERVICES BARNALI CHAKRABARTY

  2. What is an Operating System ?

  3. Features of Operating System • Multi user • Multiprocessing • Multitasking • Multithreading • Real time

  4. Classification of Services[Chow07] • Primitive Services –fundamental functions that the kernel must provide • Services by System Servers- services that need not reside in the kernel but are still essential • Value Added Servers –services that are not essential in implementation but are useful in supporting distributed applications

  5. Primitive Services • Communication- Exchange of Information between processes • Synchronization- Coordination of Events

  6. Services by System Servers • Name Server - used to locate users, processes or machines • Network Server –used to translate addresses and locations obtained from Name server • Time Server-synchronization of processes to maintain a total order of event occurrences • File Server- managing shared file system resources

  7. Value Added Services • Web Server – accepts requests from the clients , processes it and returns a response • Group Server –manages creation and termination of groups of interacting processes

  8. Classification of Services [Galvin05] • Services that are helpful to users • Services for efficient operation of system

  9. Operating System Services that are helpful to users • User Interface • Program Execution • I/O Operations • File System Operations • Error Detection

  10. User Interface The means by which the user interacts with the system Consists of • Input • Output

  11. Program Execution • Loading • Running • Execution

  12. I/O Operations The communications between the computer and the outside world

  13. File System Manipulation Programs need to read and write files and directories, create and delete them, search them, list file Information

  14. Error Detection OS needs to constantly monitor possible errors and should take an appropriate action to rectify the error

  15. Services for efficient operation of system • Resource Allocation • Accounting • Protection and Security

  16. Resource Allocation Resource allocation must be properly done when multiple users or multiple jobs running concurrently.

  17. Accounting OS keeps track of what kind of resources used, how many users etc

  18. Protection and Security • Ensuring that all access to system resources is controlled • Access to the system from outsiders requires user authentication

  19. WebOS: A Framework of OS services for wide area Applications[A.Vahdat97] • Global Naming • Wide-Area File System • Security and Authentication • Process Control

  20. Privacy as an Operating System Service [S.Iosannidis06] Approach 1.Transparent, privacy-providing storage and network 2. Privacy-enhanced system calls 3. Privacy Libraries 4. Privacy-policy Management

  21. System Support for Many Task Computing[E.V.Hensbergen,08] The paper deals with issues of scale by leveraging the large number of nodes to spread operating systems services and components across the machine, tightly coupling the operating system. The authors plan on provisioning nodes to provide workload execution, aggregation, and system services, and dynamically re-provisioning nodes as necessary to accommodate changes, failure, and redundancy.

  22. Future Work Implementation and Development of Liquid Operating system, which is spontaneous and adaptive to dynamically meet the changing requirements of the user.

  23. References [1]http://www.webopedia.com/TERM/o/operating_system.html [2]Wikipedia [3]Distributed Operating Systems and Algorithm Analysis, Andy Chow & Theodore Johnson,1997 [4]Operating System Concepts ,Silberschatz, Galvin and Gagne ,2005 [5]WebOS: Operating System Services for Wide Area Applications,Amin Vahdat et al,1997 [6]Privacy as an operating system service ,Ioannidis ,S;Sidiroglou,S;D. Keromytis,A;Proceedingsof the 1st USENIX Workshop on Hot Topics in Security,2006 [7] System support for many task computing, Van Hensberger, E.; Minnich, R.;Many-Task Computing on Grids and Supercomputers, 2008. MTAGS 2008. Workshop on 17-17 Nov. 2008 Page(s):1 - 8

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