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POThreadPool Parameters
 

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    <p>I am testing a simple threadpool solution before I put it in my application, but the results I am seeing do not make sense for me. I have a simple form with one button on it. This button starts the following loop:</p> <pre><code>private void button1_Click(object sender, EventArgs e) { MyTestThread oTask = new MyTestThread (); MyThreadInfo oTaskParameters = new MyThreadInfo(); for (int i = 1; i &lt;= 5; i++) { objTaskParameters.MyGuid = Guid.NewGuid(); objTaskParameters.MyNumber = i; ThreadPool.QueueUserWorkItem(new WaitCallback(objTask.ProcessDataForNTime), objTaskParameters); } Console.WriteLine("All threads have been queued for processing..."); } </code></pre> <p>The class it is calling, looks like this. It has a parameters MyThreadInfo class, and then the MyTestThread class just loops for 10 seconds before finishing.</p> <pre><code>public class MyThreadInfo { public int MyNumber; } public class MyTestThread { public void ProcessDataForNTime(Object oParameters) { //We pass parameters MyThreadInfo oThread = (MyThreadInfo)oParameters; int threadNo = oThread.MyNumber; Console.WriteLine("thread {0} started...", threadNo); int iN = 10; //Delay for 10 seconds DateTime dteStart = DateTime.Now; do { System.Threading.Thread.Sleep(1000); //Wait a second before we look again } while (dteStart.AddSeconds(iN) &gt; DateTime.Now); Console.WriteLine("thread {0} completed...", threadNo); } } </code></pre> <p>I would expect the results of this to display something like this in my console/output/debug log. When I step through the application, I do in fact see this:</p> <pre><code>thread 1 started... thread 2 started... thread 3 started... thread 4 started... thread 5 started... All threads have been queued for processing... thread 1 completed... thread 2 completed... thread 3 completed... thread 4 completed... thread 5 completed... </code></pre> <p>BUT, if I run the application at full speed, without stepping through the code or breakpoints, it outputs this:</p> <pre><code>All threads have been queued for processing... thread 5 started... thread 5 started... thread 5 started... thread 5 started... thread 5 started... thread 5 completed... thread 5 completed... thread 5 completed... thread 5 completed... thread 5 completed... </code></pre> <p>What is it about stepping through the code that makes it work? I did note that adding a Thread.Sleep(1000) (1 second) to the loop does force the application to label the threads correctly, but I'm trying to develop a fast multithreading application, and the idea of adding a 1 second delay for each thread is frustrating. </p> <p>Can anybody give me some insight about why I am seeing this behaviour?</p> <p>thanks...</p> <p>Sam</p>
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