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copied!<p>A number of useful API functions of this type are under the (of course!) <a href="http://msdn.microsoft.com/en-us/library/ms686832%28VS.85%29.aspx" rel="nofollow noreferrer">Tool Help</a> suite. The <a href="http://msdn.microsoft.com/en-us/library/ms682489%28VS.85%29.aspx" rel="nofollow noreferrer"><code>CreateToolhelp32Snapshot()</code></a> API will take a snapshot of the running threads for a specified process. </p> <pre><code>// Take a snapshot of all running threads hThreadSnap = CreateToolhelp32Snapshot( TH32CS_SNAPTHREAD, 0 ); if( hThreadSnap == INVALID_HANDLE_VALUE ) return( FALSE ); </code></pre> <p>Full example code <a href="http://msdn.microsoft.com/en-us/library/ms686852%28VS.85%29.aspx" rel="nofollow noreferrer">here.</a></p> <p>The struct returned does not differentiate the primary thread from the others. I do not know a mechanism to do so; while some versions of the C runtime will all ExitProcess() at the end of the primary thread, in all recent versions the process continues to run until the last thread exits.</p> <p>Interjay's recommendation to use GetThreadTimes may be the best bet. If you can <a href="http://msdn.microsoft.com/en-us/library/ms682425%28VS.85%29.aspx" rel="nofollow noreferrer"><code>CreateProcess()</code></a> the target process, the hThread member of the <a href="http://msdn.microsoft.com/en-us/library/ms684873%28VS.85%29.aspx" rel="nofollow noreferrer"><code>PROCESS_INFORMATION</code></a> block contains the tid for the primary thread. Welcome any ideas from others. </p>

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