Code review comment for lp:~alan-griffiths/mir/fix-1532202

> lgtm
>
> Not 100% sure what:
> run_cv.notify_one();
>
> Is actually *running* but does it block on this thread? (Since we block at the
> top of that function).

It is an implementation detail of compositor logic: the "run()" function blocks on run_cv awaiting a notification that there's work to do.