< H2 > problem description < H2 > create a thread instance using the inherited Thread method when overriding the run () method, modify the run () method with the synchronized keyword the result is that the threads are not carried out by Synchroni...
the code is as follows: import static java.lang.System.out; ** * * * @author *** * @create 2018-11-13 19:48 * public class Test0001 { public static Object OBJ = new Object(); public static int i; public static class MyThread1 exte...
the idea is to first construct the url list all_url and then for i in range (0, len (all_url)): urlqueue.put (all_ URL [I]) then get can pull url from the list every time now the problem is that range cannot be written as 0 to list length will sh...
I just started to learn that python, has two functions, one is to get the value of cookie of the website, and the other is to send a get request. Why can t I use this variable a? how can I use the value of a? direct print is valuable and I use multithr...
tools mysql (engine innoDB, isolation level REPEATABLE-READ) scenario (there are two operations in a transaction) Update the total score value in the user table; insert the change log of the credit record (key field: current change integral sco...
when I was testing multithreading, I found that a write module could not correctly respond to ctrl + c under multithreading. After my test, it should be caused by the paste module. How to deal with this situation? import sys import threading import tim...
import requests from lxml import html from requests.exceptions import RequestException import time import queue import threading class MyThread (threading.Thread): def __init__(self, func): threading.Thread.__init__(self) self.func = fun...
multiple requests from a user are most likely not in the same thread. Suppose the first request is thread A, which is stored in threadLoacl. The second request is thread B. isn t it impossible to get the session of the first request from the current thr...
in Java, why does the code b = = (b = a) not always return true? in a multithreaded environment a can be modified by multiple threads. b initializes to b = a when printing b = = (b = a), the result is not necessarily true. however, isn t the pri...
when watching Modern operating system, there are the following: conditional variables (unlike semaphores) will not exist in memory . If you send a semaphore to a semaphore that no thread is waiting for, the signal will be lost I would like to ask y...
< H1 > Hello, everyone. When I was reading an article, the content mentioned < H1 >. < H2 > "the atomicity of a single method does not guarantee the atomicity of compound operation " < H2 >. < H2 > what is the meaning of the compound operation in ...
Today, there are 30,000 pieces of data found by export. The result of processing will be timed out. think of multithread traversing list to find this code on the Internet: public String list2Str(List<String> list, final int nThreads) throws Exce...
the method of entering the library in service needs to be tested in the case of multithreading, and then two threads are opened to execute the service method in a loop, but there are a lot of problems, including the following situations. both threads...
Let me summarize that for any program, we first need to know whether it will run in a multithreaded environment or whether a variable will be shared by multiple threads at the same time. If so, you need to consider the issue of thread safety. ...
this is true. I would like to add a function: the server creates a timer thread to regularly poll to detect sockfd activity, shutting down sockfd that has not been active for a long time but I don t know how to judge whether a sockfd is active or not...
in the following figure, while thread An executes the synchronized method of obj, thread B can execute other non-synchronized methods of obj I have read several blogs on the Internet, and most of them say yes. But as I understand it, when thread A ...
suppose you have a quad-core machine with no hyperthreading, running multiple parallel tasks, with 75% of each task s time spent on IO,25% computing. Ask what the ideal thread pool size is ...
package com.example.demo; import java.util.concurrent.locks.ReentrantLock; public class Task implements Runnable { ReentrantLock lock; int i = 0; public Task(ReentrantLock lock) { this.lock = lock; } @Override public ...
read serial port data and display it to textbrower in real time, but thread will block. Ask for advice -sharp -*- coding: utf-8 -*- -sharp Form implementation generated from reading ui file 22.ui -sharp -sharp Created by: PyQt5 UI code generator...
The thread also does not have a separate address space, and the thread cannot cause the main process to crash through return because the thread is often a separate function? Is there any way for the thread to also recycle the stack of the main process an...
figure 1. Global execution environment = global object figure 2. Variable object of global execution environment = global object figure 3. The variable object of the global execution environment only points to the global object, contains the contents...
such as the title. as shown below, when the B mask layer pops up, press and hold the left mouse button in area B, and the content of the main content area A will move. How to block it? Note: the button in the A content area cannot be clicked at this t...
do you want to know whether Mini Program and Mini Program, whose users enter from a specific channel, have such a function or method ...
this is the configuration, the project is generated by nuxt, and the browser cannot enter the breakpoint when requesting the interface of koa router. Why? index.js:57 has an error Error: listen EADDRINUSE 127.0.0.1 Error: listen EADDRINUSE source-m...
problem description the goal requirement is: the customer enters the text, and then he can choose different art fonts [not commonly used fonts], and the effect can be previewed online. the environmental background of the problems and what methods yo...