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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"> -> </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"> <- </span>copy <span class="Constant">0</span>
<span class="Delimiter">{</span>
done?:boolean<span class="Special"> <- </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"> <- </span>write chan, n
n<span class="Special"> <- </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"> -> </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"> <- </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"> <- </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"> <- </span>start-running producer, chan
routine2:number<span class="Special"> <- </span>start-running consumer, chan
wait-for-routine routine1
wait-for-routine routine2
]
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