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Advanced Sockets

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

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Advanced Sockets

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

  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

  3. 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,

  4. THE CODE A multi-person chat server

  5. DEMO A multi-person chat server

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

  7. 1-5 • Transmission Delay • Propagation Delay • Message switched • Packet Switched • Circuit-switched vs Datagram • Differences in : Setup time, Store-and forward delay.

  8. 2-13 • Local Delay + Internet delay • What is Beta and Delta here ? • caching

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