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POwhy value variable is not changed?
 

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  1. POwhy value variable is not changed?
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    <p>I have a <code>Timer</code> in my winForms and when the <code>TimeSpan</code> is <code>0</code> I set <code>done</code> as <code>true</code> and try check the value a thread. </p> <p>My code: </p> <p>Initial variables:</p> <pre><code>private DateTime endTime = DateTime.UtcNow.AddMinutes(1); private bool done; private bool running = true; private int count = 0; private delegate void setLabelMethod(string msg); private void setLabelValue(string msg) { label2.Text = msg; } </code></pre> <p>Timer handling:</p> <pre><code>private void timer1_Tick_1(object sender, EventArgs e) { TimeSpan remainingTime = endTime - DateTime.UtcNow; if (remainingTime &lt;= TimeSpan.Zero) { label1.Text = "Done!"; timer1.Enabled = false; done = true; running = false; } else { //... } } </code></pre> <p>Thread callback function: </p> <pre><code>private void test() { do { if (done) { Invoke(new setLabelMethod(setLabelValue), "yeah"); done = false; } Thread.Sleep(500); } while (running); } </code></pre> <p>Start <code>timer1_Tick</code> and <code>Thread</code> executions.</p> <pre><code> private void button2_Click(object sender, EventArgs e) { Thread th = new Thread(new ThreadStart(test)); th.Start(); timer1.Enabled = true; } </code></pre> <p>the problem is that the following statement in <code>.test()</code> method not ever is <code>true</code>,why?</p> <p><strong>statement</strong></p> <pre><code> if (done) { Invoke(new setLabelMethod(setLabelValue), "yeah"); done = false; } </code></pre> <p>Someone can point my mistake? Thanks in advance. </p>
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    1. USThe Mask
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      1. VTUpMod
    1. COThe *done* variable must be marked volatile to work properly in the Release build. You possibly didn't wait long enough. Add a millisecond instead of a minute.
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      1. USHans Passant
    2. COWhy do you use multi-threading in the first place? Your code doesn't look CPU bound to me. There is rarely a reason to use this kind of multi-threading if you're not limited by the computation power of a single core.
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      1. USCodesInChaos
 

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