nature of the process is in single-threaded, can not use multi-core;(2) The co-process refers to a single thread, which blocks the entire thread once it encounters a blocking process.4, summarize the characteristics of the process:
Concurrency must be implemented in only one single thread
No lock required to modify shared data
The context stack in the user program that holds multiple control flows
Additional: A co-process encountered IO operation automatically switch to oth
. The nature of the process is single-threaded, unable to take advantage of multi-core, can be a program to open multiple processes, each in-process open multiple threads, each line range to open the co-path.2. The association refers to a single thread, so once the association is blocked, the entire thread is blocked.Features of the co-process:1. Concurrency must be implemented in only one single thread2. No lock required to modify shared data3. The context stack in the user program that holds m
This article will share with you the source code for processing PNG image rounded corners to maintain a PNG transparent background. for the code farmers, refer to the source code in this article.
/** Rounded corner processing * @ param BufferedImage * @ param cornerRadius **/public static String makeRoundedCorner (String srcImageFile, String result, String type, int cornerRadius) {try {BufferedImage image = ImageIO. read (new File (srcImageFile); int w = image. getWidth (); int h = image. getHei
Topic:Xiao Ming accompanied Xiao Red to see the diamonds, they from a bunch of diamonds randomly extracted two and compare their weight. The weight of these diamonds varies. After they had been comparing for some time, they had a fancy for two diamonds G1 and G2. Now, please judge which of the two diamonds is heavier according to the information you have previously compared.Given the number of two diamonds g1,g2
JAVA learning drawing color and stroke attributes set font display text, java Set Font
Package com. graphics; import java. awt. *; import java. awt. geom. rectangle2D; import java. util. date; import javax. swing. *;/***** @ author biexiansheng **/public class DrawString extends JFrame {private Shape rect; // rectangular object private Font font; // Font object private Date date; // current date object public DrawString () {rect = new Rectangle2D. double (10, 10,200, 80); font = new Font ("", Fo
One gevent moduleGevent is a third-party library that makes it easy to implement concurrent or asynchronous programming through Gevent. The main mode used in Gevent is Greenlet, which is a lightweight process that accesses Python in the form of a C extension module. Greenlet all run inside the main program operating system process, but they are dispatched in a collaborative manner.# usage G1=gevent.spawn (func,1,2,3,x=4,y=5) creates a co-object g1,spawn the first argument in parentheses is the f
Canvas entry (2): graphic gradient and image transformation, canvas gradient
Source: http://www.ido321.com/986.html
1. Graphic gradient (all tested in the latest Google Version)
1. Draw a linear gradient
1: // obtain the canvas ID
2: var canvas = document.getElementById('canvas');
3: if (canvas == null)
4: {
5: return false;
6: }
7: // obtain the context
8: var context = canvas.getContext('2d');
9: // obtain the gradient object
10: var g1 = co
single thread, so once the association is blocked, it will block the entire threadYield implementation of co-process concurrency1 Import Time 2 def consumer (): 3 r= "4 while True:5 N=yield R 6 if not N:7 return 8 print (' [CO Nsumer]←←consuming%s ... '% n) 9 time.sleep (1) r= ' Ten Ok ' one of the Def Produce (c): next (c) #1. Start Generator N =015 while N Greenlet Framework implementation (Base library for package yield)
return statement.
3. Builder Construction Instance# 使用类似列表生成式的方式构造生成器g1 = (2*n + 1 for n in range(3, 6))# 使用包含yield的函数构造生成器def my_range(start, end): for n in range(start, end): yield 2*n + 1g2 = my_range(3, 6)print(type(g1))print(type(g2))Output Result:class ‘generator‘>class ‘generator‘>4. The execution process of the generator and the execution of the feature generator:During execution, the yield keyword is interrupted execution, and the next
()Print (Stop-start)# purely computed tasks concurrent executionImport timeDef task1 ():Res=1For I in Range (1000000):Res+=iYieldTime.sleep (10000) #yield不会自动跳过阻塞Print (' Task1 ')Def task2 ():G=task1 ()Res=1For I in Range (1000000):Res*=iNext (g)Print (' Task2 ')Start=time.time ()Task2 ()Stop=time.time ()Print (Stop-start)Five, single-threaded implementation of the IO switch encountered1, with Greenlet (package yield, encountered IO does not automatically cut)From Greenlet import GreenletImport
line range open the coprocessor #2. The association refers to a single thread, so once the association is blocked, will block the entire threadSummary of the characteristics of the process:
Concurrency must be implemented in only one single thread
No lock required to modify shared data
The context stack in the user program that holds multiple control flows
Additional: A co-process encountered IO operation automatically switch to other Io,yield (how to implement detection, G
, G={a, b} Record 2: F=2, G={a, d, e} Record 3: F=1, G={b} Record 4: F=3, G={a, b} Result: a -> 3 // F=1, F=2, F=3 b -> 2 // F=1, F=3 d -> 1 // F=2 e -> 1 // F=2
Solution I:The first method is to solve the problem in two phases. In the first stage, F and G are used in Mapper to form a composite value pair, and each value pair is output in cer CER to ensure the uniqueness of the F value. In the second stage, the value pairs are grouped by G value to calculate the number of entries in each
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