% TTENTERMONITOR   Attempt to enter a monitor.%%  Usage: ttEnterMonitor(monitorname) %%  Inputs:%    monitorname   Name of the monitor the task attempts to enter.%       % See also TTCREATEMONITOR, TTEXITMONITOR%%       TrueTime, Version 1.4%       Copyright (c) 2006%       Martin Ohlin, Dan Henriksson and Anton Cervin%       Department of Automatic Control, LTH%       Lund University, Sweden