select function

The difference between MySQL semi-synchronous replication and asynchronous replication as shown in the previous schema diagram: In the case of MySQL asynchronous replication, MySQL master server transfers its own binary log through the replication

1.select ModelsThe 1.1 Select function is prototyped as follows, where Nfds represents the maximum value of the Descriptor plus 1 (because this is the left-right open interval), and the middle three parameters represent a collection of different

1. Select Model:Select model: Through a Fd_set collection management socket, after the socket requirements are met, the socket is notified. Let the socket work. Avoid sockets entering blocking mode and making unnecessary waits. Select the Fd_set

The premise is that, When receiving a receipt or reading data, take two steps. 1. Wait for the data to be ready. 2. Copy data from the kernel to the process. For a network io (socket) (Here we use read as an example), it involves two system objects,

Function prototype # Include Int poll (struct pollfd FDS [], nfds_t NFDs, int timeout ); Typedef struct pollfd {Int FD;/* file descriptor to be detected or selected */Short events;/* events of interest to the file descriptor FD */Short revents;/*

12th Chapter Concurrent ProgrammingA process is program-level concurrency, and a thread is a function-level concurrency.Three basic ways to construct concurrent programs: process: Each logical control flow is a process that is scheduled and

First of all, I am not very clear about these concepts, the following are some of my directors.Synchronous and asynchronous, blocking, and non-blocking these are two sets of concepts, saying that different things, synchronous and blocking are not

12th Chapter Concurrency ProcessApplications that use application-level concurrency are called concurrent programs.Three basic ways to construct concurrent programs: process, I/O multiplexing, threading.12.1 Process-based concurrency programming1.

In the previous article, I introduced the I/O model of five I/O models, which describes the use of I/O multiplexing in TCP sockets programming in I/O models. The use of the Select and poll functions is primarily in I/O multiplexing.Select

If you want to build a server application on Windows, you must consider the I/O model.Windows provides five I/O models: ■ Select );■ Asynchronous selection (WSAAsyncSelect );■ Event Selection (WSAEventSelect );■ Overlapping I/O (Overlapped I/O );■

I. Tutorial Purpose Understand the principles of I/O multiplexing technology. Learn to write basic Single-thread concurrent server programs and customer programs. Ii. Experimental Platform Ubuntu-8.04 Operating System Iii. experiment content I/O

For the select model of windows socket programming, socketselect Int select (Int nfds, // ignore fd_ser * readfds, // point to a socket set, used to detect its readability fd_set * writefds, // point to a socket combination, used to detect the write-

Select and WinSock asynchronous IO Models If you want to build a server application on Windows, you must consider the I/O model.Windows provides five I/O models: ■ Select );■ Asynchronous selection (WSAAsyncSelect );■ Event Selection (WSAEventSelect

Java, NIO, AIO-1Java Recently the use of TCP communication in the project to complete the command and operation results of the interaction with the typical TCP communication in the C/s architecture, the reason is simple: in the context of low

The Select function determines the state of one or more sockets (socket) and waits for asynchronous I/O if needed. int Select ( __in int Nfds, __inout Fd_set *readfds, __inout Fd_set *writefds, __inout Fd_set *exceptfds, __int const struct Timeval

int Select (        int Nfds,            //ignore         fd_ser* Rea DFDS,    //points to a socket collection that detects its readability         fd_set* Writefds,  //points to a socket combination to detect its writable   & nbsp     fd_ser*

Troubleshooting of mysql semi-synchronous replication and mysql Synchronization 1. BackgroundBy default, online mysql replication is asynchronous. In extreme cases, when switching between the master and slave databases, there is a certain

ThinkPHP framework security implementation analysis, thinkphp Framework Implementation The ThinkPHP framework is one of the popular PHP frameworks in China. Although it cannot be compared with those frameworks outside China, it has the advantage

The first time you touch LINQ is when using C #, this syntax is very handy when working with list data. If you want to know more about LINQ, you can get a bit of LINQ, but it doesn't matter if you don't understand it, let me show you the Glamour of

12th Chapter Concurrent ProgrammingA process is program-level concurrency, and a thread is a function-level concurrency.Three basic ways to construct concurrent programs: process: Each logical control flow is a process that is scheduled and