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    <blockquote> <p>I also have read that one should not start long-running code on the threadpool threads</p> </blockquote> <p>The thread pool <em>will</em> respond to long-running code correctly, so it's not like you <em>can't</em> do it - it's just not the <em>most efficient</em> way to do it.</p> <p>Also note that <code>Task.Delay</code> implies the <em>opposite</em> of "long-running" - the individual <code>Task</code> actually completes at the point of the <code>await</code> and is no longer on the thread pool. Another <code>Task</code> is created and queued to the thread pool when <code>Task.Delay</code> completes. The <code>Task</code> returned by <code>Task.Run</code> (when you pass it an <code>async</code> delegate) is actually a "proxy <code>Task</code>" that represents the entire delegate.</p> <blockquote> <p>is it possible to still use all the C# async language features (such as Task, 'await', 'async') on "regular" threads and not use the threadpool?</p> </blockquote> <p>In your situation, you don't need it, but it <em>is</em> possible. My <a href="http://nitoasyncex.codeplex.com/" rel="nofollow">AsyncEx library</a> includes an <code>AsyncContextThread</code> type that exposes a <code>TaskFactory</code> property you can use to start <code>Task</code>s on that thread.</p> <blockquote> <p>I'm servicing all instances "in parallel" using Task.Run()</p> </blockquote> <p>In your case, you don't need <code>Task.Run</code> or a <code>TaskFactory</code> at all. You can easily do this in parallel without explicitly sending work off to the thread pool:</p> <pre><code>string[] instanceNames = ...; var tasks = instanceNames.Select(ServiceInstanceAsync); await Task.WhenAll(tasks); private static async Task ServiceInstanceAsync(string name) { await DownloadAndProcessFileAsync(); await Task.Delay(15000); await ExecuteSSHAsync(); } </code></pre>
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    1. POCan Task objects only be used for threadpool threads?
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    1. USStephen Cleary
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    1. POCan Task objects only be used for threadpool threads?
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    1. COthanks. your last section about "not needing Task.Run" intrigues me; unless there's a Task.Run inside those methods, or something that otherwise gets work running concurrently on another thread, how is the work getting done concurrently?
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      1. USMichael Ray Lovett
    2. COLet me explain a bit more. In my case, I'm using an SSH library that is not async, but is thread safe. So I have created methods like GetFileAsync() which return a Task, and wrap up their SSH calls like this: "return Task.Run(()=> { ssh call });
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      1. USMichael Ray Lovett
    3. COSo in my SSH case, it's pretty visible how work can get done concurrently. I could call my GetFileAsync multiple times in a row and each would launch a threadpool thread to do the work and return their Task immediately, which I can await. But without the call to Task.Run, my SSH methods would just be synchronous..
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