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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - channel.mu</title>
<meta name="Generator" content="Vim/7.3">
<meta name="plugin-version" content="vim7.3_v6">
<meta name="syntax" content="none">
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<!--
pre { font-family: monospace; color: #eeeeee; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color: #080808; }
.muControl { color: #c0a020; }
.Delimiter { color: #800080; }
.Special { color: #c00000; }
.Constant { color: #00a0a0; }
.muRecipe { color: #ff8700; }
.Comment { color: #9090ff; }
-->
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<pre>
<span class="Comment"># example program: communicating between routines using channels</span>

<span class="muRecipe">def</span> producer chan:address:shared:channel<span class="muRecipe"> -&gt; </span>chan:address:shared:channel [
  <span class="Comment"># produce characters 1 to 5 on a channel</span>
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Comment"># n = 0</span>
  n:character<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    done?:boolean<span class="Special"> &lt;- </span>lesser-than n, <span class="Constant">5</span>
    <span class="muControl">break-unless</span> done?
    <span class="Comment"># other threads might get between these prints</span>
    $print <span class="Constant">[produce: ]</span>, n, <span class="Constant">[ </span>
<span class="Constant">]</span>
    chan:address:shared:channel<span class="Special"> &lt;- </span>write chan, n
    n<span class="Special"> &lt;- </span>add n, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muRecipe">def</span> consumer chan:address:shared:channel<span class="muRecipe"> -&gt; </span>chan:address:shared:channel [
  <span class="Comment"># consume and print integers from a channel</span>
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Delimiter">{</span>
    <span class="Comment"># read an integer from the channel</span>
    n:character, chan:address:shared:channel<span class="Special"> &lt;- </span>read chan
    <span class="Comment"># other threads might get between these prints</span>
    $print <span class="Constant">[consume: ]</span>, n:character, <span class="Constant">[ </span>
<span class="Constant">]</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muRecipe">def</span> main [
  <span class="Constant">local-scope</span>
  chan:address:shared:channel<span class="Special"> &lt;- </span>new-channel <span class="Constant">3</span>
  <span class="Comment"># create two background 'routines' that communicate by a channel</span>
  routine1:number<span class="Special"> &lt;- </span>start-running producer, chan
  routine2:number<span class="Special"> &lt;- </span>start-running consumer, chan
  wait-for-routine routine1
  wait-for-routine routine2
]
</pre>
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