How to model endless loop with UML StateDiagram

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UML

Dear readers,

I have a endless loop, which has internal state. How can this be modelled with an UML State-Diagram?

static int state = 0;
void mySstateTest(void)
{
    for(;;) {
        DoSomeImportantAction();
        if ( 0 == state ) {
            if ( 1 == GetValueFromSomewhere() ) {
                state = 1;
            }
        }
        if ( 1 == state) {
            if ( 0 == GetValueFromSomewhere() ) {
                state = 1;
            }
        }
    }
}

Thanks for replies