Lecture11n - Click to edit Master subtitle style 8/1/11...

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Unformatted text preview: Click to edit Master subtitle style 8/1/11 Lecture 11 COT 4600 Operating Systems Spring 2011 Dan C. Marinescu Office: HEC 304 Office hours: Tu-Th 5:00 – 6:00 PM Lecture 11 8/1/11 n Last time: n URLs n Soft modularity ¨ Procedure call conventions and the memory map; the stack ¨ Errors ¨ Strongly-typed languages help enforce modularity. n Enforced modularity; message passing and the client-server model. ¨ Example of a client –server system: WWW Today: ¨ Today ¨ Client-server organization ¨ Intermediaries; Trusted Intermediaries; Thin clients ¨ Issues § Heterogeneity; little-endian and big-endian representation § Timing, response time. ¨ Examples: Event service, X11; Trusted intermediaries: Email, File Systems, Web ¨ Remote Procedure Call ¨ Next time n Strategies for name resolution n Case study DNS Lecture 11 – Thursday, February 17, 2011 Lecture 11 22 Lecture 11 8/1/11 33 Lecture 11 Lecture 11 8/1/11 44 Client/service organization n Not only separates functions but also enforces this separation!! ¨ No globally-shared state (e.g., through the stack) ¨ Errors can only propagate from client to service and vice-versa only if the messages are not properly checked. ¨ A client can use time-outs to detect a non-responsive service and take another course of action. ¨ The separation of abstraction from implementation is clearer; the client needs only to know the format of the message, the implementation of the service may change....
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This note was uploaded on 07/30/2011 for the course COP 4600 taught by Professor Montagne during the Spring '08 term at University of Central Florida.

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Lecture11n - Click to edit Master subtitle style 8/1/11...

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