Introduction to Networking , Instructor: Prof. Yan Chen

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Presentation transcript:

Introduction to Networking , Instructor: Prof. Yan Chen Advanced Sockets Ashish Gupta TA , Intro to Networking Jan 14 2004 Recital 2

The problem You are a server and you want to listen for incoming connections as well as keep reading from the connections you already have. Blocking "block" is techie jargon for "sleep". Lots of functions block. accept() blocks. All the recv() functions block

The select call Enables you to deal with many clients at the same time HOW ? Monitors several sockets at the same time. tell you which ones are ready for reading, which are ready for writing,

A multi-person chat server THE CODE A multi-person chat server

A multi-person chat server DEMO A multi-person chat server

Important Points Accepting new connections via select Client closes connection Select returns “socket ready to read” recv() will return 0.

1-5 Transmission Delay Propagation Delay Message switched Packet Switched Circuit-switched vs Datagram Differences in : Setup time, Store-and forward delay.

2-13 Local Delay + Internet delay What is Beta and Delta here ? caching