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

Lecture 6 – Thursday September 9, 2010 Last time: Discussion of “Hints for Computer Systems Design” by Butler Lampson. Memory. Today: Interpreters. Communication links. Naming. Next time Lecture 6

Interpreters Active elements. Hardware interpreters; software interpreters Three abstractions: instruction reference, repertoire, and environment reference. Flow of control; interrupts. Processors. Finite-state machine with a number of distinguished initial states. Layered organization. Example: a calendar program in Java. Lecture 6

Communication links Primitives: send, receive. Wires and networks The Internet Internet Core and Edge Hourglass communication model Protocol stack The hardware Router Network adaptor Lecture 6

Figure 2.5 from the textbook Lecture 6 5

Figure 2.7 from the textbook Lecture 6 6

Internet Core and Edge Lecture 6

Hourglass communication model Lecture 6

Transport and Network Services Lecture 6

Multiplexing and Demultiplexing Lecture 6

Lecture 6

Application, Transport, Network, and Data Link Layer Protocols Lecture 6

It's a long way to Tipperary it's a long way to go!! Lecture 6

From Local Area to Wide Area Networks Lecture 6

Message delivery to processes Lecture 6

Sockets and Ports Lecture 6

Router Lecture 6

Router supporting QoS (Quality of Service) Lecture 6

The network adaptor Lecture 6