multithreading

问题 This question already has answers here : Difference between WAIT and BLOCKED thread states (6 answers) Closed 2 years ago . I have read the answer through the following posting: Difference between WAIT and BLOCKED thread states However, I am still puzzled. I want to know what is the difference on the JVM level and what is the difference on the CPU level. Whether both of these have the "Thread Context switch"? , which is faster on a multithreaded environment? 回答1: Assuming that you asking the

问题 I have just tested something that I was sure would fail miserably, but to my surprise, it worked flawlessly, and proves to myself that I am still quite mystified by how async-await works. I created a thread, passing an async void delegate as the thread's body. Here's an oversimplification of my code: var thread = new Thread( async () => { while( true ) { await SomeLengthyTask(); ... } }); thread.Start(); thread.Join(); The thing is that as far as I understand, when the execution hits the

问题 Basically I need to run two while loops at the same time. The reason being that I need one loop to update the GUI, and the other to check if the program is connected to the internet. So maybe this requires multi-threading, or maybe I am just one webpage away to fixing my problem. Here's my source code: # -*- coding: utf-8 -*- import sys import urllib2 from Tkinter import * import time import socket def TheMainProgram(): airid = 'http://www.aviationweather.gov/metar/data?ids={airid}&format=raw

问题 I'm not sure if I'm stopping a Parallel.ForEach loop as I intend to do. So let me outline the problem. The loop uses a database driver with limited available connections and it is required to keep track of the open connections, so the database driver doesn't throw an exception. The issue is that keeping track of open connections has been implemented manually (this should be refactored - writing a wrapper or using AutoResetEvent but there are some other things that need to be taken care of

问题 I'm not sure if I'm stopping a Parallel.ForEach loop as I intend to do. So let me outline the problem. The loop uses a database driver with limited available connections and it is required to keep track of the open connections, so the database driver doesn't throw an exception. The issue is that keeping track of open connections has been implemented manually (this should be refactored - writing a wrapper or using AutoResetEvent but there are some other things that need to be taken care of

问题 I'm trying to create a thread and make it print something to the terminal. I was having some problems so I decided to take this very simple piece of code someone else made, when I compile it I get the errors listed below, but other people online seem to have no problem running this. #include <iostream> #include <thread> using namespace std; void hello_world() { cout << "Hello from thread!\n"; } int main() { thread threadobj1(hello_world); threadobj1.join(); return 0; } The compiler (mingw32

问题 I am using Python 3.5.2 on windows. I would like to run a python script but guarantee that it will not take more than N seconds. If it does take more than N seconds, an exception should be raised, and the program should exit. Initially I had thought I could just launch a thread at the beginning that waits for N seconds before throwing an exception, but this only manages to throw an exception to the timer thread, not to the parent thread. For example: import threading import time def may_take

问题 I got sensor data of various types that needs to be processed at different stages. From what I have read around, the most efficent way is to split the tasks into threads. Each puts the processed data into the entry queue of the next thread. So basically, a pipeline. The data can be quite large (a few Mbs) so it needs to be copied out of the sensor buffer and then passed along to the threads that will modify it and pass it along. I am interested in understanding the best way to do the passing.

问题 I need to alter three progress bars simultaneously in three WINAPI threads. Since my funtions, that change value of progress bars are to have access to these bars, they are members of MainWindow class. So i created wrappers with signature that is required by CreateThread function, but I still get segmentation fault when I try to start my threads. What it can be caused by and how to handle this and get my code to work? Example of my function: DWORD MainWindow::ThreadFunc1() { for(int i = 0; i

问题 Closed. This question needs debugging details. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 days ago . Improve this question I am new in PyQt in python and I have been working on a GUI lately. One of the parts of the GUI is a button which is supposed to get rid of all lines currently in the GUI. Because I am using threads, the way I implemented this feature is to have a GUI attribute, self.clear, which