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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:&:sink:char<span class="muRecipe"> -> </span>sink:&: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"><-</span> copy<span class="Constant"> 0</span>
<span class="Delimiter">{</span>
done?:bool <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>
sink <span class="Special"><-</span> write sink, n
n <span class="Special"><-</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:&:source:char<span class="muRecipe"> -> </span>source:&: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"><-</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:&:source:char, sink:&:sink:char <span class="Special"><-</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"><-</span> start-running producer, sink
routine2:num <span class="Special"><-</span> start-running consumer, source
wait-for-routine routine1
wait-for-routine routine2
]
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