multithreading

问题 So I have thrown together a quick repro to highlight the issue while helping myself to understand what on earth was going on in my main app, after receiving many user reports of sudden slow behaviour out of nowhere after more than a year without issue. An active user of my application pointed out that the problem only came about after a recent Windows update, it led me to verify that it was indeed caused by the October Update 20H2. using System; using System.Diagnostics; using System

问题 I recently created a program which displays multi video sources from 2 ip cameras with opencv. but I decided to create UI for my application, and now, It's not so clear for me that how I can implement it using multi threading method. here is the code I used to display only one camera in TKinter GUI: import tkinter import cv2 import PIL.Image, PIL.ImageTk import time class App: def __init__(self, window, window_title, video_source=0): self.window = window self.window.title(window_title) self

问题 I've asked the question on unix.stackexchange as well... Can the openjdk 8 (on ubuntu) run more than 4 threads (i.e.: use the 8 cores available) on a system? Edit: I have 12 Thread objects which run simultaneously (they all produce output) but the linux top program indicates there are only 4 cores occupied with the java process (when scaling from 1 Thread to 2, 3 and 4 I didn't have this problem)... Edit2: top output: %Cpu(s): 41.8 us 6982 ubuntu 20 0 8766844 1.7g 18684 S 352.0 11.6 26:07.56

问题 I need to update ui from runnable. My logic goes like below. I start the runnable from onCreate of the fragment lifecycle. And the runnable instance is responsible to request network. The problem is I don`t know how to update the fragment after runnable instance fetched the data from network. code to start runnable in fragment in CustomFragment.java. public void onCreate(Bundle savedInstanceState) { Log.d(DEBUG_TAG, "onCreate"); super.onCreate(savedInstanceState); accountMgr

问题 why the application hangs when Executing Thread and that thread have ShowMessage or MessageDlg but when using MessageBox everything is working normally. all this happened if the application Appearance not the defualt one >> " Windows " if the selected Appearance " Windows " it will never hangs even with the ShowMessage and MessageDlg 回答1: ShowMessage() and MessageDlg() are not thread-safe. They display VCL Forms, which must only be used in the context of the main UI thread. Windows.MessageBox

问题 I ported a multi-threaded Linux application to Windows and am testing it on a server running Windows 10 Pro. The performance of the Windows version is abysmal compared to the performance of the Linux version running on the same dual-boot hardware. I simplified the code to a small multi-threaded example that exhibits the same symptoms. I am hoping that the SO community can provide some insight as to why there are such performance differences between Windows and Linux for this application, and

问题 I ported a multi-threaded Linux application to Windows and am testing it on a server running Windows 10 Pro. The performance of the Windows version is abysmal compared to the performance of the Linux version running on the same dual-boot hardware. I simplified the code to a small multi-threaded example that exhibits the same symptoms. I am hoping that the SO community can provide some insight as to why there are such performance differences between Windows and Linux for this application, and

问题 I ported a multi-threaded Linux application to Windows and am testing it on a server running Windows 10 Pro. The performance of the Windows version is abysmal compared to the performance of the Linux version running on the same dual-boot hardware. I simplified the code to a small multi-threaded example that exhibits the same symptoms. I am hoping that the SO community can provide some insight as to why there are such performance differences between Windows and Linux for this application, and

问题 I ported a multi-threaded Linux application to Windows and am testing it on a server running Windows 10 Pro. The performance of the Windows version is abysmal compared to the performance of the Linux version running on the same dual-boot hardware. I simplified the code to a small multi-threaded example that exhibits the same symptoms. I am hoping that the SO community can provide some insight as to why there are such performance differences between Windows and Linux for this application, and

问题 I'm wanting to make sure that when my application quits that any and all open threads are closed. However when I try to do so I get the error telling me that there is no reference object for what I'm trying to do, even though it's all in the same class. Can someone please help me out? Starting / opening threads: Thread listen_thread; TcpListener tcp_listener; Thread clientThread; // Use this for initialization void Start () { IPAddress ip_addy = IPAddress.Parse(ip_address); tcp_listener = new