\section{The Connection Channel Class}
\begin{vdm_al}
class MessageChannelBuffer
instance variables
\end{vdm_al}
\begin{vdm_al}
instance variables
data : [MessageChannel] := nil;
\end{vdm_al}
\begin{vdm_al}
operations
public Put: MessageChannel ==> ()
Put(msg) ==
data := msg;
\end{vdm_al}
\begin{vdm_al}
operations
public Get: () ==> MessageChannel
Get() ==
let d = data in
( data := nil;
return d
)
\end{vdm_al}
\begin{vdm_al}
sync
per Get => data <> nil;
per Put => data = nil;
\end{vdm_al}
\begin{vdm_al}
sync
mutex(Put, Get);
mutex(Put);
mutex(Get);
end MessageChannelBuffer
\end{vdm_al}
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