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copied!<p>That's not the number of spawned threads. That's the number of additional threads that could be spawned before the maximum is reached.</p> <p>MSDN: <a href="http://msdn.microsoft.com/en-us/library/system.threading.threadpool.getavailablethreads.aspx" rel="nofollow">ThreadPool.GetAvailableThreads Method</a></p> <p>GetMaxThreads minus GetAvailableThreads is probably the number you are looking for.</p> <p>Without doing anything:</p> <pre><code>class Program { static void Main(string[] args) { int workerThreads, completionPortThreads; ThreadPool.GetAvailableThreads(out workerThreads, out completionPortThreads); Console.WriteLine(workerThreads); Console.WriteLine(completionPortThreads); Console.ReadLine(); } } </code></pre> <p>The output is:</p> <pre><code>1023 1000 </code></pre> <p>If you make sure to call ThreadPool.GetAvailableThreads while you know some of your threads are still working, the number should be lower.</p> <p>Example:</p> <pre><code> static void Main(string[] args) { int workerThreads, completionPortThreads; ThreadPool.GetAvailableThreads(out workerThreads, out completionPortThreads); Console.WriteLine(workerThreads); Console.WriteLine(completionPortThreads); Console.WriteLine(); ThreadPool.QueueUserWorkItem(o => Thread.Sleep(10000)); ThreadPool.GetAvailableThreads(out workerThreads, out completionPortThreads); Console.WriteLine(workerThreads); Console.WriteLine(completionPortThreads); Console.ReadLine(); } </code></pre> <p>The output is:</p> <pre><code>1023 1000 1022 1000 </code></pre>

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