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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Mu - channel.mu</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v1">
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.Comment { color: #9090ff; }
.Constant { color: #00a0a0; }
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<pre id='vimCodeElement'>
<span class="Comment"># example program: communicating between routines using channels</span>

<span class="muRecipe">recipe</span> producer [
  <span class="Comment"># produce numbers 1 to 5 on a channel</span>
  <span class="Constant">local-scope</span>
  chan:address:channel<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Comment"># n = 0</span>
  n:number<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: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">recipe</span> consumer [
  <span class="Comment"># consume and print integers from a channel</span>
  <span class="Constant">local-scope</span>
  chan:address:channel<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    <span class="Comment"># read an integer from the channel</span>
    n:number, chan:address: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:number, <span class="Constant">[ </span>
<span class="Constant">]</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muRecipe">recipe</span> main [
  <span class="Constant">local-scope</span>
  chan:address: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 <span class="Constant">producer:recipe</span>, chan
  routine2:number<span class="Special"> &lt;- </span>start-running <span class="Constant">consumer:recipe</span>, chan
  wait-for-routine routine1
  wait-for-routine routine2
]
</pre>
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