threadpool

The Code using System; using System.Threading; public delegate void LoadingProgressCallback(double PercentComplete,string ItemName); public delegate void LoadCompleteCallback(int ItemID, string ItemName); public static class Program { public static void Main(string[] args) { LoadTest loadTest = new LoadTest(); loadTest.LoadItems(args); } } public class LoadTest { ManualResetEvent resetEvent; int numThreads = 0; public LoadTest() {} public void LoadItems(string[] Items) { numThreads = 0; resetEvent = new ManualResetEvent(false); foreach(string item in Items) { Console.WriteLine("Adding {0} to

I have a long running process that listens to events and do some intense processing. Currently I use Executors.newFixedThreadPool(x) to throttle the number of jobs that runs concurrently, but depending of the time of the day, and other various factors, I would like to be able to dynamically increase or decrease the number of concurrent threads. If I decrease the number of concurrent threads, I want the current running jobs to finish nicely. Is there a Java library that let me control and dynamically increase or decrease the number of concurrent threads running in a Thread Pool ? (The class

I would like to know what to use for tasks that need alot of performance. Backgroundworker , Thread or ThreadPool ? I've been working with Threads so far, but I need to improve speed of my applications. BackgroundWorker is the same thing as a thread pool thread. It adds the ability to run events on the UI thread. Very useful to show progress and to update the UI with the result. So its typical usage is to prevent the UI from freezing when works needs to be done. Performance is not the first goal, running code asynchronously is. This pattern is also ably extended in later .NET versions by the

Why do I get this error message? "WaitAll for multiple handles on a STA thread is not supported." Should I use [MTAThreadAttribute] attribut? Update: Dosn't work with WPF applications! Note: It error is at line WaitHandle.WaitAll(doneEvents); I'm using a standard WPF project . private void Search() { const int CPUs = 2; var doneEvents = new ManualResetEvent[CPUs]; // Configure and launch threads using ThreadPool: for (int i = 0; i < CPUs; i++) { doneEvents[i] = new ManualResetEvent(false); var f = new Indexer(Paths[i], doneEvents[i]); ThreadPool.QueueUserWorkItem(f.WaitCallBack, i); } // Wait

If I add jobs to the thread pool with QueueUserWorkItem ... how do I keep my program from going forward until all jobs are completed? I know I could add some logic to keep the app from running until all jobs are completed, but I want to know if there is something like Thread.Join() or if there's any way to retrieve each thread that is being assigned a job. You could use events to sync. Like this: private static ManualResetEvent resetEvent = new ManualResetEvent(false); public static void Main() { ThreadPool.QueueUserWorkItem(arg => DoWork()); resetEvent.WaitOne(); } public static void DoWork()

As far as I had understood ForkJoinPool , that pool creates a fixed number of threads (default: number of cores) and will never create more threads (unless the application indicates a need for those by using managedBlock ). However, using ForkJoinPool.getPoolSize() I discovered that in a program that creates 30,000 tasks ( RecursiveAction ), the ForkJoinPool executing those tasks uses 700 threads on average (threads counted each time a task is created). The tasks don't do I/O, but pure computation; the only inter-task synchronization is calling ForkJoinTask.join() and accessing AtomicBoolean s

I have a web application running in tomcat where I'm using a ThreadPool (Java 5 ExecutorService) to run IO intensive operations in parallel to improve performance. I would like to have some of the beans used within each pooled thread be in the request scope, but the Threads in the ThreadPool do not have access to the spring context and get a proxy failure. Any ideas on how to make the spring context available to the threads in the ThreadPool to resolve the proxy failures? I'm guessing there must be a way to register/unregister each thread in the ThreadPool with spring for each task, but haven