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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
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<title>Mu - channel.mu</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v2">
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* { font-size: 12pt; font-size: 1em; }
.Delimiter { color: #800080; }
.muControl { color: #c0a020; }
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<pre id='vimCodeElement'>
<span class="Comment"># example program: communicating between routines using channels</span>

<span class="muRecipe">def</span> producer sink:&amp;:sink:char<span class="muRecipe"> -&gt; </span>sink:&amp;:sink:char [
  <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:char <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
  <span class="Delimiter">{</span>
    done?:bool <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>
    sink <span class="Special">&lt;-</span> write sink, n
    n <span class="Special">&lt;-</span> add n,<span class="Constant"> 1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  close sink
]

<span class="muRecipe">def</span> consumer source:&amp;:source:char<span class="muRecipe"> -&gt; </span>source:&amp;:source:char [
  <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:char, eof?:bool, source <span class="Special">&lt;-</span> read source
    <span class="muControl">break-if</span> eof?
    <span class="Comment"># other threads might get between these prints</span>
    $print <span class="Constant">[consume: ]</span>, n:char, <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>
  source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> new-channel <span class="Constant">3/capacity</span>
  <span class="Comment"># create two background 'routines' that communicate by a channel</span>
  routine1:num <span class="Special">&lt;-</span> start-running producer, sink
  routine2:num <span class="Special">&lt;-</span> start-running consumer, source
  wait-for-routine routine1
  wait-for-routine routine2
]
</pre>
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