/**

@page LEVEL2 Realtime Sleep Timer

A realtime sleep timer is an optional class for Trick simulations.

The Realtime Sleep Timer allows the simulation to sleep in case of an frame underrun.
This is desireable to allow other processes to use the CPU during times where the
simulation would not be doing anything.

%Trick provides a Sleep Timer based on the system itimer to sleep during
simulation inactivity.

The user has the ability to enable and disable the sleep timer from the input file.

@code
trick.itimer_enable
trick.itimer_disable
@endcode

@section LEVEL3 Realtime Sleep Timer Related Pages
Realtime Realtime Sleep Timer Requirements\n
Realtime Realtime Sleep Timer Design 

*/