I would like to stop a thread in mid execution. From reading around, I am of the thought I will have to check a local variable to determine if the thread should continue or clean up and exit run(). Any ideas of cleanly implementing this? ...
I have a multithreaded program and use the signal.signal(SIGINT,func) to kill all threads when ctrl c is pressed. The question I have is this: I have to call signal.signal(...) from main in python. Do I have to call that on a loop or can I just set it once and whenever the user presses ctrl c, the signal will be caught? ...
Hi Experts, I am stuck with this problem of mine and it will be great help if someone solves this problem for me What I am trying to do is : 1) Intialize a DataTable datatable in form load event and assign its defaultview to a datagridview dgvresult 2) On click of a button start an STA thread (I am actually working with WatIN IE ...
Hi all, I know of three portable threading C++ APIs : Qt boost::thread GNU Pth Apart from possible licensing issues involved, how do these compare in: actual portability (mostly interested in Linux and Windows) capabilities programming ease-of-use support/development activity of the library And: are there more like these that a...
I have written a sample console application to test backgroundworker using one of the examples posted here in Stackoverflow. I have a backgroundworker which start with the main method but its ending in the middle of the operation if I press enter because I have written a console.readkey in the main method. But I want it to wait till the ...
The question, I have a web application - .net 4. The client is having a requirement that he want to send email to his users on a regular basis about his new courses etc. The webapplication created will hosted on a "Shared hosting environment" with no excess to windows services - file system other than the web root folder through FTP....
Hi guys, Let's say I have 2 threads, one is the main thread and another one, a secondary thread. The main thread is being used the most, but sometimes (rarely) I want the secondary thread to do some work based on calls from the main thread. Most of the time the secondary thread should sleep. Now after some searching I understand the wa...
In javadoc for ConcurrentHashMap is the following: Retrieval operations (including get) generally do not block, so may overlap with update operations (including put and remove). Retrievals reflect the results of the most recently completed update operations holding upon their onset. For aggregate operations such as putAll and clear,...
Since .NET 4.0 there is the TPL to execute asynchronous tasks. If you are reading the msdn, all async operations interacting with forms / UI still uses the InvokeRequire ... Invoke() pattern. What I'm asking is that is there a reason for it? From what I learned, TPL should be sort of a replacement of older threading mechanisms. So what's...
I'm programming a plug-in for a large system. The systems runs my plug-in in an independent thread. Inside the plug-in I'm allocating an unmanaged resource. I need to be 100% sure I release this driver. I implemented the IDisposable pattern and I covered all methods the system claims to call if the plug-in is about to be terminated. ...
I'm currently writing a little GUI program that does some work and exits afterwards. While work is done, the GUI thread is updated with infos for the user. This is the pattern I'm currently using and I'm thinking it's not the most elegant one: static void MainForm_Loaded(BeoExport exporter) { // Thread 1 runs the Export workerT...
Is it true that if I only use immutable data type, my Java program would be thread safe? Any other factors will affect the thread safety? *Would appreciate if can provide an example. Thanks! * ...
I have a need to create multiple processing threads in a new application. Each thread has the possibility of being "long running". Can someone comment on the viability of the built in .net threadpool or some existing custom threadpool for use in my application? Requirements : Works well within a windows service. (queued work can be...
I have an applet I've built using NetBeans, called AKApplet. It runs fine in the IDE, but when I put it in a web page it throws the following error: Exception in thread "Thread-15" java.lang.NoClassDefFoundError: AKApplet$2 at AKApplet.run(AKApplet.java:675) The applet uses the run() method to load some data in the background whil...
Im trying to write something which very quickly calculates random numbers and can be applied on multiple threads. My current code is: /* Approximating PI using a Monte-Carlo method. */ #include <stdio.h> #include <stdlib.h> #include <math.h> #include <time.h> #include <omp.h> #define N 1000000000 /* As lareg as possible for increased ...
I'm writing a dll library in Delphi with multiple threads created by it. Let me describe the problem step by step. I'm sorry for a lengthy description in advance :-(. Let's forget about the library for a while. I created a windows application that is going to present views from several cameras. I created a window which is meant to show ...
Hello StackOverflow. I'm working on a java project with my team at work. To summarize, we have a main class that has a method that instantiates and calls a "Save" class. This "Save" class saves files back to a server with a couple of constructors and a handful of visible and non-visible methods. The class is CPU-intensive and time-...
Hi, I have a button and I want to highlight it for a brief time. For e.g. it's a red button and it should be orange for a second and then turn red again. My code for this looks like the following: button.setBackgroundResource(R.color.orange); //highlight value button.invalidate(); try { Thread.sleep(3000...
Hello. I am trying to synchronize two threads - the "Main" thread, and a runnable. I get the IllegalMonitorStateException, but I do not completelty understand what "you do not have the lock of the object" means. Here is my code: public class ThreadsTest { private static ThreadsTest instance; public volatile boolean flag = fals...
Okay, I have a TreeView that serves as a directory tree for Windows. I have it loading all the directories and functioning correctly, but it is pausing my GUI while it loads directories with many children. I'm trying to implement multithreading, but am new to it and am having no luck. This is what I have for my TreeView: private readon...