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POemit Qt signal from non Qt Thread or ouside Qt main event loop with at 4.5
 

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    <p>I'm calling a <code>emit signal1()</code> from a non Qt thread. By non Qt thread I mean not from the GUI Event Loop and not from any QThread run() method or any QThread own event loop.</p> <p>It is simply a pthread (pthread_create()) that calls a method of a QObject which emits signals.</p> <p>ex:</p> <pre><code>MyQbject: public QObject { ... void emitBunchOfSignals() { emit signal1(); emit signal2(); ... } ... } </code></pre> <p>the "run" method of my pthread which has a pointer to a MyObject instance (instance that was created within the main Qt GUI thread context NOT the pthread) calls the <code>emitBunchOfSignals()</code> methods.</p> <p>Before Qt 4.5 that was nasty. Now, does Qt 4.5 handle this ? Does it call <code>qApp-&gt;PostEvent()</code> or something so the signal is emitted within the Qt GUI Thread (and thus the slot as well) ?</p> <p>thanks</p>
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    1. USdeepmax
    1. USNicolas Robert
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    1. COWhen you call connect, you might explicitly set the type to queued connection.
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      1. USKaleb Pederson
    2. COIn the time it took you to write down this question you could have just opened the code and look for yourself.
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      1. USshoosh
    3. COIt does not seem straight forward as it used to crash with Qt 3.xx. I'm familiar with the connect option (directconnection queuedconnection etc) but I thought it worked only between QTreads or between a QThread and the main event loop. Why it used to crash with Qt 3.xx at least was not straight forward to understand by looking at the code. Am I crazy ?
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      1. USNicolas Robert
 

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