-\section{\acrlong{TOP}}
-\subsection{\gls{iTasks}}
+\section{iTasks}
\gls{TOP} is a recent programming paradigm implemented as
\gls{iTasks}\cite{achten_introduction_2015} in the pure lazy functional
language \gls{Clean}\cite{brus_cleanlanguage_1987}. \gls{iTasks} is a
specialization instances for these functions and show an according interface.
Generated interfaces can be modified with decoration operators.
-\subsection{Combinators}
+\section{Combinators}
\Glspl{Task} can be combined using so called \gls{Task}-combinators.
Combinators describe relations between \glspl{Task}. \Glspl{Task} can be
combined in parallel, sequenced and their result values can be converted to
onValue (Value a _) = Just (f a)
onValue _ = Nothing
- onStable (Value a True) = Just (f a)
- onStable _ = Nothing
+ onStable (Value a True) = Just (f a)
+ onStable _ = Nothing
\end{lstlisting}
\item Parallel:
(-&&-) infixr 4 :: (Task a) (Task b) -> Task (a,b) | iTask a & iTask b
\end{lstlisting}
-\subsection{\acrlongpl{SDS}}
+\section{\acrlongpl{SDS}}
+\Glspl{SDS} are an abstraction over resources that are available in the world
+or in the \gls{iTasks} system. The shared data can be a file on disk, it can be
+the time, a random integer or just some data stored in memory. The actual
+\gls{SDS} is just a record containing functions on how to read and write the
+source. In these functions the \CI{*World} is available and therefore it can
+interact with the outside world. The \CI{*IWorld} is also available and
+therefore the functions can also access other shares, possibly combining them.
+
+The basic operations for \glspl{SDS} are get, set and update. The signatures
+for these functions are shown in Listing~\ref{lst:shares}. All of the
+operations are atomic in the sense that during reading no other tasks are
+executed.
+
+\begin{lstlisting}[%
+ language=Clean,label={lst:shares},caption={\Gls{SDS} functions}]
+get :: (ReadWriteShared r w) -> Task r | iTask r
+set :: w (ReadWriteShared r w) -> Task w | iTask w
+upd :: (r -> w) (ReadWriteShared r w) -> Task w | iTask r & iTask w
+\end{lstlisting}