2345678910111213141516171819202122232425262728
importgeventdeffoo():print("Running in foo")gevent.sleep(2)print("Explicit context switch to foo again")defbar():print("Explicit context to bar")gevent.sleep(1)print("Implicit context switch back to bar")deffunc3():print("running func3")gevent.sleep(0)#遇到io就切换,sleep最长2秒,所以整个程序花费两秒,如果是串行需要花费3秒print("running func3 again")gevent.joinall([gevent.spawn(foo),#启动一个协程gevent.spawn(bar),gevent.spawn(func3)])
Python-gevent Module (auto-switch IO-
valid for all users. Its common method is to use lock and unlock.C # code for a.aspxprivate void Button1_Click (object sender, System.EventArgs e) {application["name"] = Label1.Text; Server.Transfer ("b.aspx");}C # code in b.aspxprivate void Page_Load (object sender, EventArgs e) {string name; Application.Lock (); Name = application["Name"]. ToString (); Application.UnLock ();}On the surface, there are many ways to implement the value of the page, but from the realization of the fundamental vie
-modified:fri, 2006 18:53:33 GMTWhen the client requests this URL for the second time, according to the HTTP protocol, the browser transmits the If-modified-since header to the server, asking if the file has been modified after that time:If-modified-since:fri, 2006 18:53:33 GMTIf the server-side resource does not change, the HTTP 304 (not Changed.) Status code is returned automatically, and the content is empty, which saves the amount of data transferredThe client requires the server to validate
Some reasons to exclude certain directories from SVN co can be done in three steps in a circle:CO Outer directory:SVN checkout--depth empty $URL [$LOCATION]Once completed, there will be a root directory that contains only empty directoriesSet Ignore directory:CD $LOCATIONSVN up--set-depth exclude So SVN prompts the ignored directory to mark D, and then the file system is invisible.Update remaining filesSVN Up--set-depth Infinity *This allows other dir
"Sohu It News" Beijing time June 23 News, according to foreign media reports, Microsoft co-founder Paul Allen (Paul Allen) recently returned to the software market, created a xiant e-mail company, to help Outlook users organize mail management.
Xiant is the latest in a growing number of new companies offering e-mail plug-ins. Allen himself was also an investor in Gist, an e-mail search site, who last month gist a 6.75 milli
Union can also be used to implement a query with a single statement. But that increases the consumption (two select parts), and the SQL statement is longer.Here is an example of using the case function to accomplish this function SELECT country,
sum (case if sex = ' 1 ' then
population ELSE 0 END), --Male population
SUM (case if sex = ' 2 ' Then
population ELSE 0 END) -Female population
from table_a
GROUP by country; In this way, we use Select to complete the output form of the two-dimensio
220.163.13*.**[emailprotected]:~# sqlmap-u http://www.****.com.cn/****. aspx?keyword=-V 1--dbs--tamper=space2comment--level 3web server operating system:windows 2003 or XPweb Applicat Ion Technology:ASP.NET, Microsoft IIS 6.0, ASP. 2.0.50727back-end dbms:microsoft SQL Server 2005nb Sp;4 system-Level library Master: The primary control function the master database controls all aspects of SQL Server. This database includes all configuration information, user logon information, and information abou
First paradigm: A field in a database table is a single attribute and cannot be divided.One sentence summary: As long as the relational database is satisfied with the first paradigm.Second paradigm: Entity's attributes are completely dependent on the primary keywordExample: multiple patients correspond to a doctor. Split the Doctor's watch.Non-keyword fields are dependent on the primary key, but such splits do not conform to the third paradigm.The third paradigm: is a subset of the second paradi
consumer ():Print "Ready to receive"While True:y = (yield)Time.sleep (1)Print "Receive%s from producer"%yDef producer ():c = Consumer ()C.next ()i = 1While I > 0 and I Time.sleep (1)Print "Send%s to consumer"%iC.send (i)i + = 1if __name__ = = ' __main__ ':Producer ()The above process shows the basic producer-consumer model, the consumer consumer is a generator;When C.next () is called in producer for the first time, the consumer is activated and the co
Guangzhou Jia Li Biological Technology Co., Ltd. to make people more healthy, so that people to pursue health is easier and easier, is always a Ka Li biological people do not change the pursuit of the CPPCC conference. With the clarion call of the Chinese market, Guangzhou Jia Li Biotechnology Co., Ltd., Guangzhou Jia Li Biological Technology Co., Ltd., Jia Li Bi
The process also has the advantage in I/O operations, the QT event loop, the ability to many I/O is already asynchronous, the use of good asynchronous (although all say async a little anti-human thinking).Because the CPU executes the smallest unit is the thread, the co-process is only on top of it and dispatched.I mean to take advantage of good async.The process is program-level scheduling, and there is no advantage for CPU execution.The smallest exec
(that is, a specific combination of all local states), each time the procedure is re-entered, which is equivalent to the state of the last call, in other words: The position of the logical stream at the last departure.Attention:1. The python thread is at the kernel level, which is controlled by the operating system (such as single-threaded once the IO is forced to surrender CPU execution permissions, switch other threads to run)2. Single-line range to open the process, once encountered Io, from
1. What is a co-processCo-process: is a single-threaded concurrency, also known as micro-threading, fiber.The process is a kind of user-state lightweight thread, and the process is controlled by the user program itself.2. Points to note:It should be emphasized that: # 1. Python threads are at the kernel level, that is, scheduled by the operating system control (such as single-threaded encounters IO or too long execution time will be forced to hand ove
just need to get the nth bit of the Fibonacci sequence, or if we just want to generate the Fibonacci sequence, then this traditional way would be more memory-intensive.At this point, yield comes in handy.def fib (n): index = 0a = 0b = 1while Index When a function contains a yield statement, Python automatically recognizes it as a generator. At this point, the FIB (20) does not actually call the function body, but instead generates a generator object instance in the function body.Yield here you
Read Catalogue
1 co-process
2 How to implement a co-process in Python
Back to top 1 the concept of the Coprocessor 1.1 co-processCo-process, also known as micro-threading, fiber. English name Coroutine. One sentence explains what a thread is: The process is a lightweight thread that is user-state . (In fact, it does not indicate white ~)I think
This article to share the content is in-depth understanding of Python in the co-function, has a certain reference value, the need for friends can refer to
Concept:
According to Wikipedia's definition, "a process is a computer program component that produces subroutines for non-preemptive multitasking, allowing different entry points to pause or start executing programs at different locations." From a technical standpoint, "a process is a function that
The threads in the process and multithreading are similar: have their own stacks, their own local variables, have their own instruction pointers, but share global variables and other information with other collaborators. The main difference between a thread and a coprocessor is that, in a multiprocessor case, multithreading is conceptually running multiple threads at the same time, and the co-process is done through collaboration, with only one thread
GIAC, GOPs conference is the perfect endingBesides you, me, him, and Marco Education to accompany you throughMarco Education co-sponsored many global conferences, the GIAC, gops the global Internet Conference is the perfect ending, as co-organizers we are also very honored! The founder of Marco Education, Marco with the caravan cadets, gave them more opportunities to share with the big players and build a w
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.