Example
It is possible to omit the on <sensitivity_list> and the for <timeout> clauses, like in:
wait until CONDITION;
which is equivalent to:
wait on LIST until CONDITION;
where LIST is the list of all signals that appear in CONDITION. It is also equivalent to:
loop
wait on LIST;
exit when CONDITION;
end loop;
An important consequence is that if the CONDITION contains no signals, then:
wait until CONDITION;
is equivalent to:
wait;
A classical example of this is the famous:
wait until now = 1 sec;
that does not do what one could think: as now is a function, not a signal, executing this statement suspends the process forever.
