'Fd set' presentation slideshows

Lecture 12 Overview

Lecture 12 Overview. UDP Connected mode. A UDP socket can be used in a call to connect() This simply tells the O.S. the address of the peer No handshake is made to establish that the peer exists No data of any kind is sent on the network as a result of calling connect() on a UDP socket.

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TDC561 Network Programming

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Functional Dependencies

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Normal Forms

Normal Forms. Functional dependencies. Our goal: given a set of FD set, F, find an alternative FD set, G that is: smaller equivalent. Bad news: Testing F=G (F+ = G+) is computationally expensive. Good news:

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IO Multiplexing

IO Multiplexing. IO Models select(). I/O Models. Blocking Non-Blocking IO Multiplexing Signal-driven IO Asynchronous IO. IO Models. Two phases Waiting for the data Copying the data. Blocking I/O. application. kernel. System call. recvfrom. No datagram ready. Wait for data.

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Socket Programming

Socket Programming. Carsten Griwodz. What are sockets?. An API between the application and the network Applications send data through the socket over the network to a remote application Applications receive data through the socket from a remote application

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Inter-Process Communication

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Daemon Processes

Daemon Processes. Long lived utility processes Often started at system boot and ended when system shuts down Run in the background with no controlling terminal. Daemon Processes. Coding rules (see page 425) Call umask and set the file mode creation mask to 0 Call fork and let the parent die

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Socket Programming

Socket Programming. Interprocess Communication. Within a single system Pipes, FIFOs Message Queues Semaphores, Shared Memory Across different systems BSD Sockets Transport Layer Interface (TLI) Reference Unix Network Programming by Richard Stevens. BSD Socket API.

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i/o multiplexing

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i/o multiplexing

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EECS340 Recitation 1: Very helpful to your project

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I/O Multiplexing

I/O Multiplexing. Road Map: Motivation Description of I/O multiplexing Scenarios to use I/O multiplexing I/O Models Blocking I/O Non-blocking I/O I/O multiplexing ( select (..) and poll (..) function s ) Signal driven I/O Asynchronous I/O Comparison of models. Motivation.

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I/O Multiplexing

I/O Multiplexing. What is I/O multiplexing?. When an application needs to handle multiple I/O descriptors at the same time E.g. file and socket descriptors, multiple socket descriptors When I/O on any one descriptor can result in blocking. Non-forking concurrent server. Concurrent Server

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? 9 ??????????????

? 9 ??????????????. ????. ?????. ?? select ??????????????? select ???? ?? 1 ?? select ????? ???????????????? --------- ?? -------------------------------- ??? ???????????. ????????. ?????????????? ??????????? ????????????? ??????? ??? ??????????????????? ?????????????????

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Sockets and concurrency

Sockets and concurrency. 15-441 Fall 2010, Recitation 3 Your TAs. Recitation Outline. Sockets Reloaded Checkpoint 2 Project 1 Q&A General Q&A. (A little throwback to Windows 3.1). Revisiting Network Sockets. Sockets, used for network IPC

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Professor Jinhua Guo CIS427 Winter 2003

Socket Programming - Advanced Techniques Introduction to PThreads. Professor Jinhua Guo CIS427 Winter 2003. Blocking. If you don't want a socket to be blocking, you have to make a call to fcntl(): #include <unistd.h> #include <fcntl.h> . .

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Winsock programming

Winsock programming. TCP/IP UDP TCP Winsock # include <winsock.h> wsock32.lib. int WSAStartup ( WORD wVersionRequested , LPWSADATA lpWSAData ); int WSACleanup (void); int WSAGetLastError (void); # define h_errno WSAGetLastError().

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Study group exercises In attendance:

Study group exercises In attendance:. 1. Suppose you have a relation P ( A, B, C, D, E, F ), with functional dependencies ( FDs ) A ? B , BCD ? E , E ? F Suppose there are at most 2 different possible values for each of attributes A, C, and D.

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Multiplexed I/O

Multiplexed I/O. Motivation. Consider a process that reads from multiple sources without knowing in advance which source will provide some input first Three solutions: alternate non-blocking reads on input sources (wasteful of CPU)

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