doc update with TaskEnd and TaskEnd commands

rtsched-doc.tex

 package, which can be used to easily draw chronograms (GANTT charts).
 These diagrams are quite common in real-time scheduling research.
 
-The package depends on keyval and TikZ/PGF, both widely
+The package depends on keyval and TikZ/PGF (pgf version 2.10 or greater), both widely
 available on any \TeX distribution.
 
 The drawing capabilities are completely based on TikZ. Thus, you can compile
  \verb+\TaskDeadline{i}{t}+ & \verb+\TaskNDeadline{i}{t}{p}{n}+ \\
  \verb+\TaskArrDeadl{i}{t}{reld}+ & \verb+\TaskNArrDeadl{i}{t}{reld}{p}{n}+  \\
  \verb+\TaskExecDelta{i}{t}{delta}+ & \verb+\TaskNExecDelta{i}{t}{delta}{p}{n}+\\
+ \verb+\TaskEnd{i}{t}+ & \verb+\TaskNEnd{i}{t}{p}{n}+\\
+
   \hline
 \end{tabular}
 \caption{Table of periodic commands where p stands for the period and n for the number of instances}
     \TaskNArrDead{1}{0}{4}{4}{5}    % draws the arrivals and deadlines
     \TaskNExecDelta{1}{0}{1}{4}{5}  % draws executions (highest priority) 
                                     % for 5 instances of period 4 
+                                    
+    \TaskNEnd{1}{1}{4}{5}	       % draws 5 end of job execution of period 4
+
 
                                     % draws the arrival and deadline
     \TaskNArrDead{2}{0}{6}{6}{3}    % for 3 instances of period 6 
     \TaskExecution{2}{1}{4}
     \TaskExecution{2}{6}{8}
     \TaskExecution{2}{9}{10}
-    \TaskExecution{2}{13}{16}    
+    \TaskExecution{2}{13}{16} 
+    \TaskEnd{2}{4}
+    \TaskEnd{2}{10}
+    \TaskEnd{2}{16}   
   \end{RTGrid}
 
 \begin{verbatim}
     \TaskNArrDead{1}{0}{4}{4}{5}    % draws the arrivals and deadlines
     \TaskNExecDelta{1}{0}{1}{4}{5}  % draws executions (highest priority) 
                                     % for 5 instances of period 4 
+                                    
+    \TaskNEnd{1}{1}{4}{5}           % draws 5 end of job execution of period 4
 
    	\TaskNArrDead{2}{0}{6}{6}{3}    % draws the arrival and deadline
                                     % for 3 instances of period 6 
+	    
     
     % no simple formula for lowest priority, sorry!
     \TaskExecution{2}{1}{4}
     \TaskExecution{2}{6}{8}
     \TaskExecution{2}{9}{10}
-    \TaskExecution{2}{13}{16}    
+    \TaskExecution{2}{13}{16} 
+    \TaskEnd{2}{4}
+    \TaskEnd{2}{10}
+    \TaskEnd{2}{16}  
   \end{RTGrid}
 \end{verbatim}
   \caption{Using periodic commands to avoid repetitions}
 style. An example is in Figure~\ref{fig:resp-time} that uses command
 \texttt{TaskRespTime}. 
 
-\begin{figure}
+\begin{figure}[!htbp]
   \centering
   \begin{RTGrid}{2}{20}
   
   \label{fig:resp-time}
 \end{figure}
 
+It is sometimes usefull to represent the end of a job execution, especially when jobs are preempted. In that case, you can use the \verb+\TaskEnd{i}{t}+ command and its periodic version detailed in Table~\ref{tab:periodic_versions} that draw little circle(s) at the specified date(s). It works in the same way as \verb+\TaskArrival+ command and it is used in Figure~\ref{fig:ex1a}.
+
+
+
 
 \subsection{Controlling visualization}
 
 
 Notice that the order with which the objects are drawn is exactly the
 same as the order in which they are specified in the code, excepted 
-for horizontal axes, arrivals and deadlines that are always drawn on the foreground.
- For example, in Figure \ref{fig:ex3a}, the executions of all the tasks are
+for horizontal axes, arrivals, deadlines and end of job execution that are always drawn on the foreground. 
+For example, in Figure \ref{fig:ex3a}, the executions of all the tasks are
 drawn on top of the box. You can try to move the \texttt{RTBox}
 command at the end to see what happens.
 
 \TaskExecution[color=white,execlabel=S]{3}{4}{5}
 \end{verbatim}
 
-\begin{figure}
+\begin{figure}[!htbp]
   \centering
   \begin{RTGrid}[width=12cm]{3}{25}
     \TaskArrDead{3}{0}{20}