blocking tapestry

ReferenceRichard Stevens's"UNIX Network Programming Volume 1, third edition: The sockets networking". Steven s proposed a total of five Io models: Blocking Io Nonblocking Io Io multiplexing (select and poll) Signal driven io (sigio) Asynchronous io (the POSIX aio_functions) First, let's talk about the objects and steps involved when I/O occurs.An input operation usually involves the following two phases:1. Wait for the da

Reprint Please specify source:http://blog.csdn.net/ns_code/article/details/17511147Blocking QueuesThe blocking queue is the content in the new Java 5 concurrency feature, and the interface for the blocking queue is Java.util.concurrent.BlockingQueue, which has multiple implementation classes: Arrayblockingqueue, Delayqueue, Linkedblockingqueue, Priorityblockingqueue, Synchronousqueue, etc., the use of a sim

This article mainly introduces information about UI thread blocking caused by Jqueryajax synchronous blocking. For more information, see the latest project, I encountered a problem with ui thread blocking caused by ajax synchronization. I will share my problem solving process with you. The reason is that there are multiple similar asynchronous request actions on

Many people put synchronization, Asynchronization, blocking, and non-blocking together for discussion, which is often difficult to differentiate. Let's take a root look at these concepts. First, asynchronous synchronization is relative to synchronization, and blocking and non-blocking are involved in synchronizat

Blocking sleep implementation mechanism and blocking sleep Mechanism Before looking at the implementation mechanism of blocking sleep, let's look at the waiting queue that is widely used in the kernel.The waiting queue of the Linux kernel is a double-loop linked list structure, which is closely integrated with the process scheduling mechanism and can be used to

Target, QT program as a client, Windows under Winsock as a server side, to achieve both ends of communication.A small function test was written at the beginning:[CPP] View plainCopyQtcpsocket Tmpsock;Tcpsock.connecttohost ("59.64.159.87", 7716);Tcpsock.write (Buf,strlen (BUF) +1);Msleep (3000);Tcpsock.disconnect ();The test results found that the client could only connect to the server side, and the server side could not receive messages from the client.The initial speculation may be that QT's s

is followed by the embedded JS, the CSS will be blocked after the download of the resource situation. When you put the embedded JS in front of the CSS, there will be no blocking situation.Root cause: Because the browser will maintain the HTML in the order of CSS and JS, the stylesheet must be loaded before the embedded JS execution, parsing finished. Embedded JS will block the subsequent loading of resources, so the above CSS

Asynchronous and thread blocking, asynchronous thread Blocking Returned directoryIt should be understood in this way Asynchronous: early developers had many misunderstandings about it. They thought that the main thread without blocking is asynchronous, And the UI without blocking is asynchronous. However, Asynchronizat

I. Conceptual understanding1. Synchronous Asynchronous:Synchronous and asynchronous concern is that the message communication mechanism (synchronous communication/asynchronous communication) is called synchronization, that is, when a * call is emitted, the * call does not return until the result is obtained. But once the call returns, it gets the return value. In other words, it is the result of the * caller actively waiting for this * call *.Instead of async, the call is returned immediately af

The blocking assignment and non-blocking assignment are described in the language of OpenGL. But literally, blocking means that it gets stuck somewhere during execution. After this operation is completed, continue to execute the following statement, non-blocking means that no matter whether the execution is complete, n

Network Programming: synchronous, asynchronous, blocking, non-blocking, and network programming I. Network Programming I/O models always involve these concepts. I have asked a lot of people, but few of them can clearly tell the difference between them. They even have many different opinions on the Internet. I don't know whether the meaning of Chinese text is profound or profound, these concepts are still ir

[Blocking and non-blocking]When sending data through a socket, if the method is returned only after the data is sent, that is, if we use send (buffer, 100 .....) if such a function sends 100 bytes to someone else, we have to wait until 100 bytes are sent by ourselves,ProgramThis is blocking,Instead of blocking, when yo

QT Open External Program[CPP]View Plaincopy 1. By calling system functions System ("Opt/myapp"); //This is Linux, under Windows can use WinExec and other functions 2. Blocking calls via Qprocess Qprocess::execute ("/opt/myapp"); //absolute path and relative path can be, windows with EXE suffix, system applications such as Notepad Notepad can be entered directly open 3. Non-bloc