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copied!<p>EDIT: Now that you've changed the code, there are two problems:</p> <ol> <li><p>You potentially try to <em>restart</em> a thread, if you ever call <code>processQueue</code> after the processing has finished. You can't do that.</p></li> <li><p>If <code>processQueue</code> is called from multiple threads, you have issues of potentially starting multiple threads due to race conditions, and also memory model potential issues.</p></li> </ol> <p>The first point is more simply solved using:</p> <pre><code>if (subprocess == null || !subprocess.IsAlive) { subprocess = new Thread(processor.run); subprocess.IsBackground = true; subprocess.Start(); } </code></pre> <p>... but this still leaves the potential problem of the second point. What is calling <code>processQueue</code>? Is it always the same thread? (And why are you ignoring .NET naming conventions?)</p> <p>My guess is that what you're seeing is <em>actually</em> the processing happening exactly once, but there being no work to do, and future calls not restarting the thread as presumably you expected - whereas if you have the breakpoint there, then by the time you hit "go" again, there's work to do. At a guess... certainly starting a thread <em>does</em> work without breakpoints, so the flaw is somewhere in your code. If you could produce a short but <em>complete</em> program that demonstrates the problem, we could get to the bottom of it.</p> <hr> <p>Your thread does almost nothing, so it's entirely reasonable for the thread to complete before it reaches the <code>while</code> loop. It's not that it doesn't start - it's that it starts and then finishes immediately.</p> <p>Alternatively, you could have an execution flow like this:</p> <pre><code>Main thread New thread status Not started... Check: IsAlive == false Still not started... Check: IsAlive == false Starting! Call startProcessing... startProcessing completes... Finished Check: IsAlive == false </code></pre> <p>The thread has executed with no problems, but <code>IsAlive</code> is always false.</p> <p>It's not clear <em>why</em> you have this code in the first place - what are you trying to achieve?</p>

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