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<a class="external" href="http://cml.cs.uchicago.edu/"><img src="moin-www.png" alt="[WWW]" height="11" width="11">Concurrent ML</a> is an SML concurrency library based on synchronous message passing.  MLton has an initial port of CML from SML/NJ, but is missing a thread-safe wrapper around the Basis Library and event-based equivalents to <tt>IO</tt> and <tt>OS</tt> functions. <p>
All of the core CML functionality is present. 
</p>

<pre class=code>
<B><FONT COLOR="#0000FF">structure</FONT></B> CML: CML
<B><FONT COLOR="#0000FF">structure</FONT></B> SyncVar: SYNC_VAR
<B><FONT COLOR="#0000FF">structure</FONT></B> Mailbox: MAILBOX
<B><FONT COLOR="#0000FF">structure</FONT></B> Multicast: MULTICAST
<B><FONT COLOR="#0000FF">structure</FONT></B> SimpleRPC: SIMPLE_RPC
<B><FONT COLOR="#0000FF">structure</FONT></B> RunCML: RUN_CML
</PRE>
<p>
 
</p>
<p>
The <tt>RUN_CML</tt> signature is minimal. 
<pre class=code>
<B><FONT COLOR="#0000FF">signature</FONT></B> RUN_CML =
   <B><FONT COLOR="#0000FF">sig</FONT></B>
      <B><FONT COLOR="#A020F0">val</FONT></B> isRunning: unit -&gt; bool
      <B><FONT COLOR="#A020F0">val</FONT></B> doit: (unit -&gt; unit) * Time.time option -&gt; OS.Process.status
      <B><FONT COLOR="#A020F0">val</FONT></B> shutdown: OS.Process.status -&gt; 'a
   <B><FONT COLOR="#0000FF">end</FONT></B>
</PRE>
 MLton's <tt>RunCML</tt> structure does not include all of the cleanup and logging operations of SML/NJ's <tt>RunCML</tt> structure.  However, the implementation does include the <tt>CML.timeOutEvt</tt> and <tt>CML.atTimeEvt</tt> functions, and a preemptive scheduler that knows to sleep when there are no ready threads and some threads blocked on time events. 
</p>
<p>
Because MLton does not wrap the Basis Library for CML, the "right" way to call a Basis Library function that is stateful is to wrap the call with <tt>MLton.Thread.atomically</tt>. 
</p>
<h2 id="head-0bb18642b70b9f8a9c12ccf39487328f306b8e19">Usage</h2>

    <ul>

    <li>
<p>
 You can import the CML Library into an MLB file with  <tt>$(SML_LIB)/cml/cml.mlb</tt> 
</p>
</li>
    <li class="gap">
<p>
 If you are porting a project from SML/NJ's <a href="CompilationManager">CompilationManager</a> to MLton's <a href="MLBasis"> ML Basis system</a> using <tt>cm2mlb</tt>, note that the following map is included by default: 
<pre>$cml/cml.cm  $(SML_LIB)/cml/cml.mlb
</pre> This will automatically convert a <tt>$cml/cml.cm</tt> import in an input <tt>.cm</tt> file into a <tt>$(SML_LIB)/cml/cml.mlb</tt> import in the output <tt>.mlb</tt> file.
</p>
</li>

    </ul>


<h2 id="head-a4bc8bf5caf54b18cea9f58e83dd4acb488deb17">Also see</h2>

    <ul>

    <li>
<p>
 <a href="ConcurrentMLImplementation">ConcurrentMLImplementation</a> 
</p>
</li>
    <li>
<p>
 <a href="eXene">eXene</a> 
</p>
</li>
</ul>

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<p>
<hr>
Last edited on 2005-12-02 03:33:39 by <span title="ppp-71-139-183-221.dsl.snfc21.pacbell.net"><a href="StephenWeeks">StephenWeeks</a></span>.
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