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Synchronizing GUI-code necessary?

Hi,

I'm pretty new to cocoa, so I run into all sorts of questions. One is in regards to receiving input from the GUI.

Let's say I have code like this:

- (void)keyDown:(NSEvent *)theEvent
{
myValue=myValue2+myValue3;
myValue3=myValue2/2+myValue;
myValue2=myValue/2;
}

Do I need to synchronize this block? I.e. are the messages from the GUI multithreaded and do I need to worry about it?
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