blocking non blocking

APR 18One, Global interpreter lock (GIL)To run the test.py process:A. Read the code of the Python interpreter from the hard disk into memoryB. Read the test.py code from the hard disk into memory (two code is installed in a process)C, read the code

1. Concurrency (concurrency): In the operating system , refers to a period of time a few programs are in the start run until the run is complete, And these programs are all running on the same processor . Two of these concurrency relationships are

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

First, create an applicationIf we use PHP to write back-end code, we need an Apache or Nginx http server, with MOD_PHP5 modules and php-cgi. From this perspective, the entire "Receive HTTP request and provide WEB page" requirement does not need PHP

Synchronous, asynchronous: Concept: Notification mechanism of the message to explain: related to the IO notification mechanism; The so-called synchronization, is to initiate the call, the caller processing the message, must wait for processing to

2015-08-19 15:23:38 WednesdayIf your code is in a process where more than one thread is running at the same time, and these threads may run this code at the same timeThread safety issues are caused by global variables and static variables.In general,

Synchronous Asynchrony is for the interaction of the application and the kernel. For example: When a process triggers an IO operation,Synchronization: The process needs to determine when the IO operation is complete and the process itself needs

"Blocking" and "non-blocking" and "synchronous" and "asynchronous" cannot simply be literally understood, providing an answer from a distributed system perspective.1. Synchronous and asynchronousSynchronous and asynchronous attention ismessage

http://www.zhihu.com/question/19732473 AnswerSynchronous and asynchronous are the means of communication,Sync: I sent the request and waited for your answer.Async: I send a request, do something else, have the result notify me, I'll deal with

The explanations you see in the know are good."Blocking" and "non-blocking" and "synchronous" and "asynchronous" cannot simply be literally understood, providing an answer from a distributed system perspective.1. Synchronous and

Turn to knowing http://www.zhihu.com/question/19732473Synchronous and asynchronous attention is to the message communication mechanism (synchronous communication/asynchronous Communication)The so-called synchronization is that when a * call is

When I was a sophomore looking at "thinking in Java" NIO, these concepts are very vague, now senior seniors graduating, see the "Tomcat authoritative guide" when you have to meet these concepts, this decision to understand it.If they are directly

C ++ ------- What is synchronization, what is asynchronous, and what is blocking? Non-blocking? Visit various forums, Comprehensive views, My opinion is posted here, If people in the community are confused, Younger brother will remember for

Http://www.cnblogs.com/Fly-Wind/p/io.htmlhttp://blog.csdn.net/historyasamirror/article/details/5778378As described above, the difference between non-blocking io and asynchronous io is obvious. In non-blocking io, although the process will not be

[Synchronous and asynchronous] In layman's terms:Synchronization refers to the communication mode in which the sender sends a packet only after the receiver sends a response.Asynchronous means that the sender sends the next packet instead of

In network programming, we often encounter the concepts of blocking, non-blocking, synchronous, and asynchronous. Many people are very confused. Now let's talk to everyone about my understanding of the two concepts. First, let's talk about blocking

Old Zhang loves drinking tea, without talking nonsense, and boiling water. Appearance character: Lao Zhang, two kettle (ordinary kettle for short; ring kettle for short ). 1. Old Zhang put the kettle on the fire and waited for the water to open.

Blocking instances var fs = require (' FS '); var data = Fs.readfilesync (' test.txt ') Console.log (data.tostring ()); Console.log ('--------------- -‘);Results: Non-blocking var fs = require (' FS '); Fs.readfile (function(error,

One, GIL: Global interpreter Lock1. GIL: Global Interpreter LockGil is essentially a mutex, which is sandwiched between the interpreter,All threads within the same process need to grab the Gil lock before executing the interpreter code2. Gil's

synchronous asynchronous blocking non-blocking: nonsense do not say, Lao Zhang Love tea, boiled water, there are two kettle, ordinary kettle, Ring kettle (water meeting tips) (quoted) synchronization is ordinary kettle boiling water, to do nothing