Programmer Think

In the project, a QThread object manages a thread. Generally speaking, the execution of a thread starts with the run () function. In Qt, there are two ways. The first is to inherit QThread and rewrite run() function. The second is to inherit QObject function and add time-consuming operations, and then call QObject::moveToThread() function. It i ...

What is pooling technology Common pooling technologies include: connection pool, object pool, memory pool, thread pool, etc. The core of pooling technology is reuse. Thread pool concept The cost of starting a new thread is relatively high because it involves interaction with the operating system. Using thread pool can improve performance, es ...

Method 1: inherit Thread class step Define a MyThread class and inherit the Thread classOverride the run method in the MyThread classCreate an object of the MyThread classStart thread MyThred class package com.cmy.threaddemo; /** * @author Ming Yong Chen */ public class MyThread extends Thread { /** * Method executed after t ...

Introduction background of thread concept process We have known the concept of process in the operating system before. The program cannot run alone. Only when the program is loaded into memory, the system allocates resources for it, and this executed program is called a process. The difference between a program and a process is that a program ...

Why use thread pools? Thread pool is a form of multi-threaded processing. Tasks are added to the queue during processing, and then automatically started after threads are created. Thread pool threads are background threads. Each thread uses the default stack size, runs at the default priority, and is in a multithreaded unit. If a thread ...

Java. Net has been introduced before Lang package. Today, we will add two common API s: Java Lang. throwable and Java lang.Thread 1, Exception (java.lang.Throwable) 1. What is abnormal: Exceptions in Java refer to abnormal conditions that occur during the execution of the program, which will eventually lead to abnormal stop of the JVM. In ob ...

Process and thread 1 process 1.1 concept of process A process is a running program, which represents the memory area occupied by the program 1.2 process characteristics Independence Process is an independent entity in the system. It can have its own independent resources. Each process has its own private address space. ...

Problem Description: July 28, 2021 17:34:5 After adding a blocking thread to return to the origin: The code is as follows: # -*- coding=utf-8 -*- import threading import time import unittest from selenium import webdriver ''' The top 10 data of Tencent position and write excel， There are 10 messages per page https://careers.tencent ...

Thread and process concepts: Process: Process is the basic unit of resource (CPU, memory, etc.) allocation. It is an instance of program execution.When the program runs, the system will create a process, allocate resources for it, and then put the process into the process ready queueWhen the process scheduler selects it, it will allocate C ...

◆ summary In this paper, the author tries to combine non blocking and blocking queues to become a new combined thread pool. The thread pool has a shared task queue, and each worker thread has a work task queue. Tasks submitted by thread pool users are first saved in the shared task queue. The scheduler thread of the thread pool assigns the task ...