CIS 3210 Lecture Notes - Lecture 5: Inter-Process Communication, Message Transfer Agent, Voice Over Ip

• School: University of Guelph
• Department: Computing and Information Science
• Course: CIS 3210
• Professor: Xiaodong Lin

Document Summary

Do not communicate directly with each other. Arbitrary end systems directly communicate with each other. Peers request service from other peers, provide service in return to other peers. Self scalability - new peers bring new service capacity, as well as new service demands. Peers are intermittently connected and change ip addresses. Program is a passive entity stored on disk (executable le) Program becomes process when executable le loaded into memory. In other words, process is a program in execution. Processes communicating process: program running within a host. Within the same host, two processes communicate using inter-process communication (de ned by os) Processes in di erent hosts communicate by exchanging messages (accross the network) Server process: process that waits to be contacted. Aside: applications with the p2p architectures have client processes and server processes. Sending process shoves the message out the door.