Fastest wait until pin changes from LOW to HIGH

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2

Its kind of strange (or I just don't understand how to do it), but I tried the following

In my setup code I set

pinMode(5, INPUT); // set pin to input
digitalWrite(5, HIGH); // turn on pullup resistors

Then in my loop I have

while (PIND & ( 1 << 5 )){
}
blablabla....

I thought that would make my code halt until I connect port D pin 5 (digital out 5 on arduino) to ground and only when I connect the pin to ground it will execute blablabla... ?

Or am I totally wrong?