% -*- mode: latex; auto-revert-interval: 0.5 -*-

\begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto, node distance=2.5em,
                   very thin,font={\scriptsize\bf}]

  \pgfdeclarelayer{background}
  \pgfdeclarelayer{foreground}
  \pgfsetlayers{background,main,foreground}

  \tikzstyle{basic-block} = [draw=black!50, fill=white, rectangle, 
      minimum width=6em, minimum height=1.3em]
  \ifthenelse{\boolean{preview}}
    {\tikzstyle{block} = [basic-block]}
    {\tikzstyle{block} = [basic-block, drop shadow]}

  \tikzstyle{enter} = [block, ellipse, fill=red!20]
  \tikzstyle{guard} = [block, fill=yellow!20]
  \tikzstyle{newguard} = [block, fill=green!20]
  \tikzstyle{lbl} = [font={\scriptsize\it}, minimum width=0em]

  \clip (-1.9, 1.05) rectangle (6.7,-6.9); 

  % main loop
  \node[enter, name=loop0] {loop 1} ;
  \node[guard, name=loop1, below of=loop0] {...} ;
  \node[guard, name=loop2, below of=loop1] {...} ;  
  \path (loop0.south) edge (loop1.north) ;
  \path (loop1.south) edge (loop2.north) ;
  \path (loop2.south) 
            edge[distance=9em, out=230, in=130]
        (loop0.north) ;

  % exit bridge 1
  \node[newguard, name=exit0, right=1.5em of loop2, fill=black!10] {exit
    bridge};


  % other loop
  \node[enter, name=other0, below left=3em and -2em of exit0] {loop 2} ;
  \node[guard, name=other1, below of=other0] {...} ;
  \node[guard, name=other2, below of=other1] {...} ;
  \path (other0.south) edge (other1.north) ;
  \path (other1.south) edge (other2.north) ;
  \path (other2.south) 
            edge[distance=9em, out=230, in=130]
        (other0.north) ;


  \path (loop1.south east) edge (exit0.north) ;
  \path (exit0.south) 
            edge[out=270, in=90] 
        (other0.north) ;

  % exit bridge 2
  \node[newguard, name=exit1, right=1.5em of other2, fill=black!10] {exit bridge};
  \path (other1.south east) edge (exit1.north) ;
  \path (exit1.south) 
            edge[out distance=15em, in distance=12em, out=320, in=50] 
        (loop0.north) ;
    
    
\end{tikzpicture}