select call

You can use the following code to read data from a socket: While (n = read (socketfd, Buf, bufsize)> 0) If (write (stdout_fileno, Buf, n) = N) { Printf ("write error "); Exit (1 ); } When the file table item corresponding to the socketfd descriptor

The difference between select, poll and Epoll Select Select was first seen in the 4.2BSD in 1983, and it was used by a select () system to monitor multiple file descriptor arrays (everything in Linux is file, block device, socket connection, etc.).

Before we say the I/O model, let's talk about the concepts of synchronous, asynchronous, blocking, non-blocking, which are four ways to call:Synchronization: When a function call is made, the call does not return until the result is obtained, and

Recently encountered some common concepts, especially the concept of network programming, such as: blocking, non-blocking, asynchronous I/O and so on, for these concepts themselves are not too clear understanding, but very vague concept, said

Transferred from: http://blog.chinaunix.net/uid-26000296-id-3754543.htmlIntroduction:Linux? The most commonly used input/output (I/O) model is synchronous I/O.In this model, when a request is made, the application blocks until the request is

1.1 Events used in life:I want to go to the bank to save money business, because there are many people, need to wait in line. 1) queuing is divided into the queue to wait and take the number of waiting two. Waiting in the team, then I need to

delete.php $link =mysql_connect ("localhost", "root", ""); mysql_select_db ("dbname"); $id =$_post[' select ']; Call the name of input foreach ($id as $ide) { $exec = "Delete from tablename where sid= $ide"

In Home/tpl, the new indexfile folder name should be the same as the controller name, and then the index.html template file should be created. the new template file should be the same as the method name, so that you can find the call template in the

Differences between Mysql stored procedures and functions bitsCN.com Differences between Mysql stored procedures and functions A stored procedure is a collection of user-defined SQL statements involving tasks of a specific table or other

Control concurrency There are two classic ways, one is Waitgroup, the other is the context, today I will talk about the context. What is Waitgroup Waitgroup before we introduced in the concurrency, it is a way to control concurrency, it is the way

Learn about MYSQL Stored Procedure 1. Stored Procedure is a set of SQL statements for specific functions. it is compiled and Stored in the database. You can run a stored procedure by specifying its name and providing parameters (if the stored

What is the SocketSocket interface is the TCP/IP network API, the Socket interface defines many functions or routines, programmers can use them What is SocketA Socket interface is an API of a TCP/IP network. a Socket interface defines many functions

Objective Call Software Run architecture Initializing the configuration phase Dynamically Refresh monitoring device information Get device-related information Note Objective After installing

The Multi InterfaceMulti interfaceThe easy interface as described in detail in this document are a synchronous interface that transfers one file at a time a D doesn ' t return until it was done.The easy interface is synchronous and calls the

background:In the last blog post for the introduction, introduced a magical open source PACs system--orthanc. This article begins by interpreting the relevant content in the official cookbook, and for simple browsing, access and uploading please

Socket programming, communicationClient socket ()----->connect ()------->recv ()-----> Close ();Server-side sockets ()----->bind ()------> Listen ()---->accept ()------>send ()------->close ();1> socket (int family,int type,int protocol);Family,

In the network programming of Linux, the new event triggering mechanism is-epoll. The biggest benefit compared to Select,epoll is that it does not reduce efficiency as the number of monitoring FD increases. Because in a select implementation in the

From http://www.cppblog.com/converse/archive/2009/05/13/82879.html First, we will explain the concepts of synchronization and Asynchronization. Notification Mechanism of messages Related. For example, if I go to a bank to handle business

Concurrency of 4.3.4Selector objects are thread-safe, but they contain a collection of keys that are not. The collection of keys returned through keys () and Selectkeys () is a direct reference to the collection of private set objects inside the

Article very good, excerpted from:http://www.codeceo.com/article/xcode-instruments-ios-memory.htmlAlthough the arc mechanism was added after iOS 5.0, a memory leak might exist due to the complexity of the mutual reference relationship. So it's