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<title>Mu - channel.mu</title>
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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="Identifier">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  chan:address:channel<span class="Special"> &lt;- </span><span class="Identifier">next-ingredient</span>
  <span class="Comment"># n = 0</span>
  n:number<span class="Special"> &lt;- </span>copy <span class="Constant">0:literal</span>
  <span class="Delimiter">{</span>
    done?:boolean<span class="Special"> &lt;- </span>lesser-than n:number, <span class="Constant">5:literal</span>
    <span class="Identifier">break-unless</span> done?:boolean
    <span class="Comment"># other threads might get between these prints</span>
   <span class="Identifier"> $print</span> <span class="Constant">[produce: ]</span>, n:number, <span class="Constant">[ </span>
<span class="Constant">]</span>
    chan:address:channel<span class="Special"> &lt;- </span>write chan:address:channel, n:number
    n:number<span class="Special"> &lt;- </span>add n:number, <span class="Constant">1:literal</span>
    <span class="Identifier">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="Identifier">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  chan:address:channel<span class="Special"> &lt;- </span><span class="Identifier">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:address:channel
    <span class="Comment"># other threads might get between these prints</span>
   <span class="Identifier"> $print</span> <span class="Constant">[consume: ]</span>, n:number, <span class="Constant">[ </span>
<span class="Constant">]</span>
    <span class="Identifier">loop</span>
  <span class="Delimiter">}</span>
]

<span class="muRecipe">recipe</span> main [
  <span class="Identifier">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  chan:address:channel<span class="Special"> &lt;- </span>init-channel <span class="Constant">3:literal</span>
  <span class="Comment"># create two background 'routines' that communicate by a channel</span>
  routine1:number<span class="Special"> &lt;- </span>start-running producer:<span class="muRecipe">recipe</span>, chan:address:channel
  routine2:number<span class="Special"> &lt;- </span>start-running consumer:<span class="muRecipe">recipe</span>, chan:address:channel
  wait-for-routine routine1:number
  wait-for-routine routine2:number
]
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