[Paparazzi-devel] flight plans: what makes it hold in holding point?

[martinpi . public]

Just for curiosity: 
>From this code (basic.xml)

    <block name="Holding point">
      <set value="1" var="kill_throttle"/>
      <attitude roll="0" throttle="0" vmode="throttle"/>
    </block>

I wouldn't expect the autopilot to wait for anything but go on to the next 
block immediately. 

Instead, in the holding point block, I would expect a loop like 
while launch==0 ... 

How does it work?