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, it is not directly to receive the data but to create a callback function. Callback functions are maintained by the system. He automatically scans the data store at the specified time. If there is data, he stores the data in the specified byte array. Without the user to care. Second explanation: One, to give a call example:Blocking block is when you dial someone's phone, but the person is not there, so you take the phone and wait for him to come back, and you can't use the phone. The synchroniz
1. Conceptual understanding In network programming, we often see synchronous (sync)/async (Async), blocking (block)/non-blocking (Unblock) Four call modes:Sync:The so-called synchronization is that when a function call is made, the call does not return until the result is obtained. That is, one thing must be done , so that the next thing is done before you can do it. For example, normal B/s mode (synchronou
asynchronous calls, the return of the call is not controlled by the caller.For the three ways to notify callers, the following is the case:StateThat is, listening to the status of the callee (polling), the caller needs to check every time, the efficiency will be very low.NoticeWhen the callee executes, a notification informs the caller that there is no need to consume too much performance.CallbackSimilar to notifications, when the callee executes, it invokes the callback function provided by th
Concept understanding Five I/O models in Linux Blocking Io Model Non-blocking Io Model Io Reuse Model Signal-driven I/O Asynchronous Io Model Comparison of five I/O models Introduction to selectpollepoll Socket blocking and non-blocking, synchronous and asynchronous 1. Conc
High-performance IO Design Mode: blocking/non-blocking, synchronous/asynchronous parsing, io Design Mode When it comes to high performance, I think everyone like this. Today we will mainly understand several key concepts in high performance I/O design, the most important first step in doing anything is to make the concept clear, isn't it? Here is: blocking, non-
Callable, Future blocking queue blocking stack, callablefutureSimple Applications of Callable and Future Before Java 5, the thread does not return values. It often takes a long time to "have" the returned values, and the code is not easy to write. Or simply bypass this hurdle and go another way. Now Java finally has a task that can return values (also called a thread. The Callable interface must be implem
Directory (?) [-] Conceptual understanding Five types of IO models under Linux Blocking IO Model Non-blocking IO model IO multiplexing Model Signal-driven IO Asynchronous IO Model Comparison of an IO model Selectpollepoll Introduction Socket blocking vs. non-blocking
Synchronous and asynchronous: related to the notification mechanism of a message . Essential differences Practical examples Sync mode To wait for the message to be triggered by the person handling the message I go to the bank to handle business, choose to queue, etc., row to the end of the deal. Asynchronous mode By triggering mechanism to notify the person who processed the message I went to the bank to transact busine
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
To put it more simply: Obstruction is not the end of the work, no return,Non-group games you do it first, I'll see if there's anything else. Tell me when it's over. Let's take the most commonly used send and recv two functions ...For example, you call the Send function to send a certain byte, in the system sent to do the work is actually just the data transfer (COPY) to the TCP/IP protocol stack output buffer, and its success does not mean that the data has been successfully sent out, if the tcp
Http://hj490134273.blog.163.com/blog/static/1446496162010494441182/ I just started to learn socket programming. I just made a simple chat room program. Later I went deep into it and found many problems, first, let's talk about the three socket usage methods (winapi socket, casyncsocket, and csocket) on the widows platform. First, let's talk about the differences between the four modes. I 've got to know about them by looking for information everywhere, recorded here: During network programming,
Basic Winsock knowledge We do not plan to systematically introduce socket or Winsock knowledge here. First, we will introduce the Winsock API function, introduce the concept of blocking/non-blocking, and then introduce the use of socket. Winsock APIA socket interface is an API for network programming (usually the TCP/IP protocol or other protocols. The earliest socket interface is the Berkeley interface, w
blocking Mode Windows Sockets perform I/O operations in both blocking and non-blocking modes. In blocking mode, the action function that executes until the I/O operation is complete waits without immediate return, and the thread where the function is located is blocked here. Instead, in nonblocking mode, the socket f
first step: Save the CPU context, program counters, and registers.The second step: Update the PCB information, the process of the PCB into the corresponding queue, such as ready, in an event blocking queue, select another process to execute, and update its PCB.Step three: Update the data structure of the memory management.Fourth step: Restore the processor context#这几步理解不了无所谓 .... In fact, the main thing is to explain that the process and the process
During network programming, we often see four call Methods: synchronous, asynchronous, blocking, and non-blocking. These methods are not easy to understand. The following is my understanding of these terms.SynchronizationThe so-called synchronization means that when a function call is sent, the call will not return until the result is not obtained. According to this definition, most functions are called syn
Java EE Development of various types of resources download list, the history of the most complete IT resources, personal collection summary. synchronous, asynchronous, blocking, and non-blocking are some basic sockets calling methods, and one of the basic concepts that need to be understood and differentiated when doing network programming. There are a wealth of articles and discussions on this topic, whi
This article will introduce you to an article on the concepts of PHP-Socket-blocking and non-blocking, synchronization and Asynchronization. I hope this article will help you. This article will introduce you to an article on the concepts of PHP-Socket-blocking and non-blocking, synchronization and Asynchronization. I h
Synchronous/asynchronous and blocking/non-blocking) Asynchronous I/O From Wikipedia, the free encyclopedia Asynchronous I/O, OrNon-blocking I/O, Is a form of input/output processing that permits other processing to continue before the transmission has finished. Input and output (I/O) operations on a computer can be extremely slow compared to the processing of dat
) they handle.Ii. Blocking and non-blockingBlocking/non-blocking. They are the status of the Program (thread) waiting for messages (synchronous or asynchronous.1. ConceptsA. BlockingBlocking call means that the current thread will be suspended before the call result is returned. The function is returned only after the result is obtained.Some people may equate blocking
Recently saw OvS user-state code, in receiving the kernel state information, the use of Epoll multiplexing mechanism, it is very puzzled, so from the Internet to find some information, learning a bit of "UNIX Network into Volume 1: Socket Network API" this book corresponding chapters, online although there are many blog posts about the topic, And the explanation is very detailed, but here still do a study note, record your thoughts.IO model In the book UNIX Network becomes Volume 1: Socket Netwo
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