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POClosing side thread before closing the main form
 

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    <p>I'm making a GUI application with windows forms in Visual Studio .NET 2010 using <code>C#</code>. I have multiple threads, for example:</p> <ol> <li>Thread that is pinging target device to make sure the connection is not lost</li> <li>A thread that requests and receives measurement results from the device</li> <li>A thread that is constantly updating the main form with these results. This thread invokes changes in main form controls using <code>Control.Invoke()</code>. My goal: I want to make sure that form is closed properly when user presses (x) on the main form. That means I want my connection to close, all side threads to terminate etc. I'm trying to use <code>FormClosing</code> event. There I set KillThreads flag to true and wait for side threads to terminate. There is a check in each, something like </li> </ol> <pre class="lang-cs prettyprint-override"><code>if(KillThreads) return; </code></pre> <p>But there is an issue. If I try to wait for all threads to be terminated</p> <pre><code>for(;;) if(ActiveSideThreads == 0) break; closeConnection(); </code></pre> <p>the thread N3 freezes blocked by <code>Invoke()</code> call; Sure it is, because the main gui thread is in infinite loop. So the form closing is delayed forever.</p> <p>If I implement before-close operations as a thread procedure 4, and make a new thread in FromClosing event handler, form closes immediately, before the thread 4 termination, and <code>Invoke()</code> throws an error - t. 4 could not close thread 3 in time. If I add <code>Join(), Invoke()</code> calls are blocked again, and thread 3 is never terminated, so thread 4 waits forever.</p> <p>What should I do? Is there some way to resolve this issue?</p>
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    1. COIf you are closing main form this mean you are closing application, am I right? So take a look at the System.Windows.Forms.Application.Exit() method, it stops all message loops all all running threads before exit
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    2. COWhy do you want/need to wait for those threads to exit before closing the form?
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    3. COalso you can keep thread object in list and before closing main form use `[thread-object]. kill()`. or something like that
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