1. COP 4600 Operating Systems Fall 2010 Dan C. Marinescu Office: HEC 439 B Office hours: Tu-Th 3:30-4:30 PM

2. Last time: Soft modularity  Procedure call conventions and the memory map; the stack; Errors  Strongly-typed languages help enforce modularity. Today: Problem solving – problem 2.2 Enforced modularity; message passing and the client-server model.  Example of a client –server system: WWW  Client-server organization  Next time:  Heterogeneity; little-endian and big-endian representation  Timing, response time.  Trusted intermediaries  Case study the X11 system. Peer-to-peer systems Remote Procedure Calls Domain Name Service (DNS) Lecture 11 – Tuesday September 29, 2010 Lecture 112

3. 3

4. 4