multithreading

问题 I am a newb, and I have read about Garbage Collection from the first two answers here. Now justifying the use of Immutable Objects even if the programmer has to create new objects, as compared to using existing objects (in multi-threaded applications), this tutorial says that the cost of object creation is made up for by the decrease in memory overhead due to garbage collection , and the elimination of code to protect mutable objects from threads interference and memory consistency errors:

问题 I am a newb, and I have read about Garbage Collection from the first two answers here. Now justifying the use of Immutable Objects even if the programmer has to create new objects, as compared to using existing objects (in multi-threaded applications), this tutorial says that the cost of object creation is made up for by the decrease in memory overhead due to garbage collection , and the elimination of code to protect mutable objects from threads interference and memory consistency errors:

问题 I am a newb, and I have read about Garbage Collection from the first two answers here. Now justifying the use of Immutable Objects even if the programmer has to create new objects, as compared to using existing objects (in multi-threaded applications), this tutorial says that the cost of object creation is made up for by the decrease in memory overhead due to garbage collection , and the elimination of code to protect mutable objects from threads interference and memory consistency errors:

问题 I am a newb, and I have read about Garbage Collection from the first two answers here. Now justifying the use of Immutable Objects even if the programmer has to create new objects, as compared to using existing objects (in multi-threaded applications), this tutorial says that the cost of object creation is made up for by the decrease in memory overhead due to garbage collection , and the elimination of code to protect mutable objects from threads interference and memory consistency errors:

问题 I'm working on a project that involves access by reading a String from a physical card, the following code simplifies the main point of my program, however when I try to make a pause for a few seconds after an user has swipe his card, something goes wrong and the behavior is not what I need, the program pauses but the color's pane doesn't change nor the label. Any suggestion? This is the code: import java.awt.*; import java.awt.event.*; import javax.swing.*; public class B2 extends JFrame

问题 I"m learning about HTML5 workers from here and the author uses self.onmessage and self.postmessage to communicate between the main thread and the worker "because the worker cannot access the DOM." But in the below it seems like self is referring to both the main thread and the worker. function CalculatePi(loop) { var c = parseInt(loop); var f = parseFloat(loop); var n=1; //these errors will need more work… if (isNaN(c) || f != c ) { throw("errInvalidNumber"); } else if (c<=0) { throw(

问题 I have questions about TMREWSync: Is it possible to upgrade Read lock to Write lock without unlocking? Don't understand what I should do if BeginWrite returns false? 回答1: Yes, TMREWSync supports lock upgrades. Use it like: BeginRead ... BeginWrite ... EndWrite ... EndRead . Source code in System.SysUtils states: The function result of BeginWrite indicates whether another thread got the write lock while the current thread was waiting for the write lock. Return value of True means that the

问题 I'm reallt trying to get my head around async/await and Tasks . I'm trying to get one method down so that I can use it throughout my program. Basically I have my own version of BusyIndicator that I want to display whilst work is being done. Here is a basic example; private async void OnPageLoad(object sender, RoutedEventArgs e) { var waitWindow = new PleaseWaitWindow(); waitWindow.Show(); await LoadCompanyContracts(); waitWindow.Close(); } private async Task LoadCompanyContracts() { await

问题 I'm reallt trying to get my head around async/await and Tasks . I'm trying to get one method down so that I can use it throughout my program. Basically I have my own version of BusyIndicator that I want to display whilst work is being done. Here is a basic example; private async void OnPageLoad(object sender, RoutedEventArgs e) { var waitWindow = new PleaseWaitWindow(); waitWindow.Show(); await LoadCompanyContracts(); waitWindow.Close(); } private async Task LoadCompanyContracts() { await

问题 Is there a way to cancel the copying process started by calling copyIn() method in a separate thread? Say, I have a list of csv-files which I need to copy from, getting maximum of database server power. So I create n-threads-connections for n-files, but I cannot find a way to abort a single operation if, for example, a wrong file has been chosen. Killing threads does not work - COPY just keeps running. The FutureTask<> class is used to create the threads, so there is a list of them - one for