select function

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

Blocking I/O programming has two features: 1. If one finds that I \ O has input, and the other has input during reading, no response will be generated at this time. this requires your program statements to use the select function to know that data

  The select model is the most common I/O model in Winsock. The core is to use the select function to manage I/O! The select function is used to determine whether data on a socket is readable or whether data can be written to a socket to prevent the

I. Understanding of UNIX Network Programming 5 I/O models 1.1, blocking I/O modelsBlocking I/O (blocking I/O) model, the process calls Recvfrom, whose system calls are not returned until the datagram arrives and is copied into the buffer of the

Generalized synchronous/asynchronous, blocking/ non-blocking Synchronous vs Asynchronous (synchronous vs asynchronous) A message communication mechanism that synchronizes and asynchronously concerns. Synchronization and Asynchrony are just the

1. Issue backgroundBy default, MySQL replication on the line is asynchronous, so in the extreme case, there is a certain probability of cubby the main library data when switching, so after the switch, we will rollback back to the tool to ensure that

Multi-channel multiplexing Function description We all know that the Fcntl () function solves the problem of file sharing, if you don't know, please see: http://blog.csdn.net/mybelief321/article/details/8993138. The next step is to handle I/O

Seven407blog. csdn. netseven407articledetails6401792 general operation procedure (Video device): 1. Open the device file. Intfdopen (devvideo0, O_RDWR); 2. Obtain the capability of the device to see what functions the device has, such as whether it

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I. synchronous and asynchronousSynchronous/asynchronous, which are notifications of messages1. ConceptsA. SynchronizationThe so-called synchronization means that when a function call is sent, the call will not return until the result is not obtained.

1. Open a file: $ Openfileflag = open (filehandle, "pattern identifier FILENAME "); If the file is successfully opened, the true value (non-null) is returned. If the file fails to be opened, the false value (null value) is returned. The default

The socket Select model is a more commonly used I/O model that enables Windows Sockets applications to be available at the same timeManages and controls multiple sockets, the core of which is the Select () function----Call the Select () function to

It is called a select model because it uses the SELECT function primarily to manage I/O. This model was designed from a UNIX system to allow applications that want to avoid blocking on socket calls to have the ability to manage multiple sockets.int

TCP/IP network programming -- better than select epoll We have discussed the select method for implementing I/O multiplexing in concurrent servers. However, the select method has low performance and is not suitable for the mainstream modern

1. I/O modelAn input operation typically consists of two different stages: waiting for data to be ready, copying data from the kernel to the process.Blocking I/O modelsNon-blocking I/O modelI/O multiplexing model: The kernel discovery process

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

Summary of Knowledge pointsConcurrent Programming * Sequence Concurrency: Logical control flows overlap in time. Application-level Concurrency: Accessing slow I/O devices Interacting with people Reduce latency by

Original article:Http://www.51see.com/asp/bbs/public/bp_show.asp? T_id = 200308131152297103. Let's talk about the difference between Socket mode and socket I/O model. First, it is only for Winsock. If you want to pick an egg in the bones and apply

For example, if you enter Michael Jacob or Changsha or Hunan in the input box, Michael Jacob will make you choose. If you enter 18, Michael Jacob will appear at the same time.The test data source is as follows:Copy codeThe Code is as follows: s1

First, understand what is the I/O model preliminarily.1. Review the user Configuration and kernel state.The operating system sits between the application and the hardware, essentially a software that consists of the kernel and system calls.Kernel: