blocking tapestry

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 understand it also understand, but to let oneself accurately describe the specific details of the concept, but said not so accurate, This is the reason why they have n

Http://blog.csdn.net/lb85858585/article/details/6693458Differences between synchronous/asynchronous mode and blocking/non-blocking mode I like to explain some concepts by connecting to some phenomena in real life in my own language. When I can do this, it means that I have understood this concept. the concept to be explained today is: the difference between synchronous/asynchronous and

Then draw on the theory in the UNIX Network programming Volume:The 2 main objects involved in IO operations are program processes, system cores. As an example of a read operation, when an IO read occurs, it typically goes through two steps:1, waiting for data preparation2. Copy data from the system kernel to the operation processFor example, in a read operation on the socket, step 1 waits for the network packet to arrive, then copies it to the system kernel's buffer, and step 2 copies the packet

(may be 5 seconds or one day) to tell you the result (return result ). In the asynchronous communication mechanism, the bookstore owner directly told you to check the mechanism. After checking the mechanism, he called you and hung up the phone directly (no result is returned ). After checking the information, he will take the initiative to call you. Here, the boss calls back and forth through "power-Back. 2. Blocking and non-

Five I/O modes-blocking (default IO mode), non-blocking (common language pipeline), I/O multiplexing (IO multiplexing scenario), signal I/O, asynchronous I/OFive I/O modes:"1" Blocking I/O (I/O operations under Linux are blocking I/O by default, that is, open and socket created I/O are blocked I/O)"2" non-

Today accidentally received a message, really shocked me, blog Xuan sent me a message, said it is my blog article has characteristics can be out of the book, this simply let me flattered, I just a junior technical house, write blog is also some of their own learning ideas and in the Internet to see some of my blog post and the comprehensive write, In short this gives the additional impetus, lets oneself move forward, hoped and everybody can share some own experience, in the most needs the strugg

We do some more work for the client's writing. This time we use non-blocking IO to implement the Connect function. int Connect (intconststruct sockaddr *addr, socklen_t Addrlen);Non-blocking IO has the following uses: 1. The process of three handshake is born, and other things are handled. 2. Use this to establish multiple connections at the same time. 3. To implement the Timeout connect fu

Good article, from: http://blog.csdn.net/yankai0219/article/details/8018232 0. OrderFirst of all, read the content of the reference article to learn about it. I will write it below. In addition, I refer to the writing methods in the above articles to understand technical problems with the events in my life. Synchronization and Asynchronization, blocking, and non-blocking are inevitable for beginners. I hope

Simply put: Blocking means you cannot finish it,If you are not in a group competition, you should do it first. I want to see if there is anything else. Let me know when it's over. Let's take the most commonly used send and recv functions for example...For example, if you call the send function to send a certain Byte, the work done by sending in the system is actually to transfer data (Copy) to the output buffer of the TCP/IP protocol stack, it is succ

Oracle blocking (blocked), blocking Blocking is a common situation for DBAs. especially poor application design blocking can cause serious performance degradation until the database crashes. For DBA, it is necessary to know how to locate the system blocking, who is the

Non-blocking IO and blocking IO: In network programming, the concept of blocking IO and non-blocking IO is encountered for a network handle, and here is a description of the two sockets first:Basic concepts: Blocking IO:: The blocking