cml.tex

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\section{The {\cf CML} structure}



\begin{synopsis}
\item {\kw{signature}} \textcf{CML}\label{sig-CML}
\item {\STRUCTURE} \textcf{CML: CML}\label{str-CML}
\end{synopsis}

\begin{interface}
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\item {\index{thread_id@thread\_\linebreak[0]id!CML@\textcf{CML}}}{\kw{type}} \textcf{thread\_\linebreak[0]id}
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\item {\index{chan@chan!CML@\textcf{CML}}}{\kw{type}} \(\alpha\)~\textcf{chan}
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\item {\index{event@event!CML@\textcf{CML}}}{\kw{type}} \(\alpha\)~\textcf{event}
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\item {\index{version@version!CML@\textcf{CML}}}{\kw{val}} {\cf version: \(\{\mbox{\cf{}system}:\mbox{\cf{}string},\,\mbox{\cf{}version\_id}:\mbox{\cf{}int}\;\mbox{\cf{}list},\,\mbox{\cf{}date}:\mbox{\cf{}string}\}\)}

\item {\index{banner@banner!CML@\textcf{CML}}}{\kw{val}} {\cf banner: \(\mbox{\cf{}string}\)}

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\item {\index{spawnc@spawnc!CML@\textcf{CML}}}{\kw{val}} {\cf spawnc: \((\alpha\rightarrow \mbox{\cf{}unit})\rightarrow \alpha\rightarrow \mbox{\cf{}thread\_id}\)}

\item {\index{spawn@spawn!CML@\textcf{CML}}}{\kw{val}} {\cf spawn: \((\mbox{\cf{}unit}\rightarrow \mbox{\cf{}unit})\rightarrow \mbox{\cf{}thread\_id}\)}

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\item {\index{yield@yield!CML@\textcf{CML}}}{\kw{val}} {\cf yield: \(\mbox{\cf{}unit}\rightarrow \mbox{\cf{}unit}\)}

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\item {\index{exit@exit!CML@\textcf{CML}}}{\kw{val}} {\cf exit: \(\mbox{\cf{}unit}\rightarrow \alpha\)}

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\item {\index{getTid@getTid!CML@\textcf{CML}}}{\kw{val}} {\cf getTid: \(\mbox{\cf{}unit}\rightarrow \mbox{\cf{}thread\_id}\)}

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\item {\index{sameTid@sameTid!CML@\textcf{CML}}}{\kw{val}} {\cf sameTid: \((\mbox{\cf{}thread\_id}\mtoksep{}\verb,*,\mtoksep{}\mbox{\cf{}thread\_id})\rightarrow \mbox{\cf{}bool}\)}

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\item {\index{compareTid@compareTid!CML@\textcf{CML}}}{\kw{val}} {\cf compareTid: \((\mbox{\cf{}thread\_id}\mtoksep{}\verb,*,\mtoksep{}\mbox{\cf{}thread\_id})\rightarrow \mbox{\cf{}order}\)}

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\item {\index{hashTid@hashTid!CML@\textcf{CML}}}{\kw{val}} {\cf hashTid: \(\mbox{\cf{}thread\_id}\rightarrow \mbox{\cf{}word}\)}

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\item {\index{tidToString@tidToString!CML@\textcf{CML}}}{\kw{val}} {\cf tidToString: \(\mbox{\cf{}thread\_id}\rightarrow \mbox{\cf{}string}\)}

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\item {\index{joinEvt@joinEvt!CML@\textcf{CML}}}{\kw{val}} {\cf joinEvt: \(\mbox{\cf{}thread\_id}\rightarrow \mbox{\cf{}unit}\;\mbox{\cf{}event}\)}

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\item {\index{channel@channel!CML@\textcf{CML}}}{\kw{val}} {\cf channel: \(\mbox{\cf{}unit}\rightarrow \alpha\mtoksep{}\mbox{\cf{}chan}\)}

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\item {\index{sameChannel@sameChannel!CML@\textcf{CML}}}{\kw{val}} {\cf sameChannel: \((\alpha\mtoksep{}\mbox{\cf{}chan}\mtoksep{}\verb,*,\mtoksep{}\alpha\mtoksep{}\mbox{\cf{}chan})\rightarrow \mbox{\cf{}bool}\)}

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\item {\index{send@send!CML@\textcf{CML}}}{\kw{val}} {\cf send: \((\alpha\mtoksep{}\mbox{\cf{}chan}\mtoksep{}\verb,*,\mtoksep{}\alpha)\rightarrow \mbox{\cf{}unit}\)}

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\item {\index{recv@recv!CML@\textcf{CML}}}{\kw{val}} {\cf recv: \(\alpha\mtoksep{}\mbox{\cf{}chan}\rightarrow \alpha\)}

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\item {\index{sendEvt@sendEvt!CML@\textcf{CML}}}{\kw{val}} {\cf sendEvt: \((\alpha\mtoksep{}\mbox{\cf{}chan}\mtoksep{}\verb,*,\mtoksep{}\alpha)\rightarrow \mbox{\cf{}unit}\;\mbox{\cf{}event}\)}

\item {\index{recvEvt@recvEvt!CML@\textcf{CML}}}{\kw{val}} {\cf recvEvt: \(\alpha\mtoksep{}\mbox{\cf{}chan}\rightarrow \alpha\mtoksep{}\mbox{\cf{}event}\)}

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\item {\index{sendPoll@sendPoll!CML@\textcf{CML}}}{\kw{val}} {\cf sendPoll: \((\alpha\mtoksep{}\mbox{\cf{}chan}\mtoksep{}\verb,*,\mtoksep{}\alpha)\rightarrow \mbox{\cf{}bool}\)}

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\item {\index{recvPoll@recvPoll!CML@\textcf{CML}}}{\kw{val}} {\cf recvPoll: \(\alpha\mtoksep{}\mbox{\cf{}chan}\rightarrow \alpha\mtoksep{}\mbox{\cf{}option}\)}

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\item {\index{wrap@wrap!CML@\textcf{CML}}}{\kw{val}} {\cf wrap: \((\alpha\mtoksep{}\mbox{\cf{}event}\mtoksep{}\verb,*,(\alpha\rightarrow \beta))\rightarrow \beta\mtoksep{}\mbox{\cf{}event}\)}

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\item {\index{wrapHandler@wrapHandler!CML@\textcf{CML}}}{\kw{val}} {\cf wrapHandler: \((\alpha\mtoksep{}\mbox{\cf{}event}\mtoksep{}\verb,*,(\mbox{\cf{}exn}\rightarrow \alpha\mtoksep{}\mbox{\cf{}event}))\rightarrow \alpha\mtoksep{}\mbox{\cf{}event}\)}

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\item {\index{guard@guard!CML@\textcf{CML}}}{\kw{val}} {\cf guard: \((\mbox{\cf{}unit}\rightarrow \alpha\mtoksep{}\mbox{\cf{}event})\rightarrow \alpha\mtoksep{}\mbox{\cf{}event}\)}

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\item {\index{withNack@withNack!CML@\textcf{CML}}}{\kw{val}} {\cf withNack: \((\mbox{\cf{}unit}\;\mbox{\cf{}event}\rightarrow \alpha\mtoksep{}\mbox{\cf{}event})\rightarrow \alpha\mtoksep{}\mbox{\cf{}event}\)}

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\item {\index{choose@choose!CML@\textcf{CML}}}{\kw{val}} {\cf choose: \(\alpha\mtoksep{}\mbox{\cf{}event}\;\mbox{\cf{}list}\rightarrow \alpha\mtoksep{}\mbox{\cf{}event}\)}

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\item {\index{sync@sync!CML@\textcf{CML}}}{\kw{val}} {\cf sync: \(\alpha\mtoksep{}\mbox{\cf{}event}\rightarrow \alpha\)}

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\item {\index{select@select!CML@\textcf{CML}}}{\kw{val}} {\cf select: \(\alpha\mtoksep{}\mbox{\cf{}event}\;\mbox{\cf{}list}\rightarrow \alpha\)}

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\item {\index{never@never!CML@\textcf{CML}}}{\kw{val}} {\cf never: \(\alpha\mtoksep{}\mbox{\cf{}event}\)}

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\item {\index{alwaysEvt@alwaysEvt!CML@\textcf{CML}}}{\kw{val}} {\cf alwaysEvt: \(\alpha\rightarrow \alpha\mtoksep{}\mbox{\cf{}event}\)}

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\item {\index{timeOutEvt@timeOutEvt!CML@\textcf{CML}}}{\kw{val}} {\cf timeOutEvt: \(\mbox{\cf{}Time}.\mbox{\cf{}time}\rightarrow \mbox{\cf{}unit}\;\mbox{\cf{}event}\)}

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\item {\index{atTimeEvt@atTimeEvt!CML@\textcf{CML}}}{\kw{val}} {\cf atTimeEvt: \(\mbox{\cf{}Time}.\mbox{\cf{}time}\rightarrow \mbox{\cf{}unit}\;\mbox{\cf{}event}\)}

\end{interface}

\begin{descr}
\item {\index{thread_id@thread\_\linebreak[0]id!CML@\textcf{CML}}}{\kw{type}} \textcf{thread\_\linebreak[0]id}\label{ty-CML.thread_id}

\begin{speccomment}
\item 

	  Thread IDs are the unique IDs associated with CML threads. 	  These IDs are in an unspecified total order that can be used to 	  break cyclic depedencies (see {\cf \small compare\-Tid}).     \end{speccomment}
\item {\index{chan@chan!CML@\textcf{CML}}}{\kw{type}} \(\alpha\)~\textcf{chan}\label{ty-CML.chan}

\begin{speccomment}
\item 

          This is the type constructor for synchronous channels.     \end{speccomment}
\item {\index{event@event!CML@\textcf{CML}}}{\kw{type}} \(\alpha\)~\textcf{event}\label{ty-CML.event}

\begin{speccomment}
\item 

	  Event values are abstract representations of synchronous operations 	  (so called \emph{first-class sychronous operations}).     \end{speccomment}
\item {\index{version@version!CML@\textcf{CML}}}{\kw{val}} {\cf version: \(\{\mbox{\cf{}system}:\mbox{\cf{}string},\,\mbox{\cf{}version\_id}:\mbox{\cf{}int}\;\mbox{\cf{}list},\,\mbox{\cf{}date}:\mbox{\cf{}string}\}\)}\label{val-CML.version}

\item {\index{banner@banner!CML@\textcf{CML}}}{\kw{val}} {\cf banner: \(\mbox{\cf{}string}\)}\label{val-CML.banner}


\begin{speccomment}
\item 

	These specify the version of CML in the same format as SML/NJ.     \end{speccomment}
\item {\index{spawnc@spawnc!CML@\textcf{CML}}}{\kw{val}} {\cf spawnc: \((\alpha\rightarrow \mbox{\cf{}unit})\rightarrow \alpha\rightarrow \mbox{\cf{}thread\_id}\)}\label{val-CML.spawnc}

\item {\index{spawn@spawn!CML@\textcf{CML}}}{\kw{val}} {\cf spawn: \((\mbox{\cf{}unit}\rightarrow \mbox{\cf{}unit})\rightarrow \mbox{\cf{}thread\_id}\)}\label{val-CML.spawn}


\begin{speccomment}
\item {\cf \small spawnc \mbox{\cf \small \textit{f}} \mbox{\cf \small \textit{x}} 	\newline}
{\cf \small           spawn \mbox{\cf \small \textit{f}}         } 
creates a new thread of control to evaluate the body of \mbox{\cf \small \textit{f}}. 	A new unique ID for the thread is created and returned.     \end{speccomment}
\item {\index{yield@yield!CML@\textcf{CML}}}{\kw{val}} {\cf yield: \(\mbox{\cf{}unit}\rightarrow \mbox{\cf{}unit}\)}\label{val-CML.yield}


\begin{speccomment}
\item 

	This function can be used to implement an explicit context switch. 	Since CML is preemptively scheduled, it should never be necessary for 	user programs to call this function. 	It is mainly used for performance measurements.     \end{speccomment}
\item {\index{exit@exit!CML@\textcf{CML}}}{\kw{val}} {\cf exit: \(\mbox{\cf{}unit}\rightarrow \alpha\)}\label{val-CML.exit}


\begin{speccomment}
\item {\cf \small exit () 	} 
causes the calling thread to terminate.     \end{speccomment}
\item {\index{getTid@getTid!CML@\textcf{CML}}}{\kw{val}} {\cf getTid: \(\mbox{\cf{}unit}\rightarrow \mbox{\cf{}thread\_id}\)}\label{val-CML.getTid}


\begin{speccomment}
\item {\cf \small get\-Tid ()           } 
returns the thread ID of the calling thread.     \end{speccomment}
\item {\index{sameTid@sameTid!CML@\textcf{CML}}}{\kw{val}} {\cf sameTid: \((\mbox{\cf{}thread\_id}\mtoksep{}\verb,*,\mtoksep{}\mbox{\cf{}thread\_id})\rightarrow \mbox{\cf{}bool}\)}\label{val-CML.sameTid}