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<title>signal (CountingSemaphore)</title>
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<pre><span class="ruby-comment cmt"># File lib/facet/semaphore.rb, line 58</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">signal</span>
<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">critical</span> = <span class="ruby-keyword kw">true</span>
<span class="ruby-keyword kw">begin</span>
<span class="ruby-keyword kw">if</span> (<span class="ruby-ivar">@counter</span> <span class="ruby-operator">+=</span> <span class="ruby-value">1</span>) <span class="ruby-operator"><=</span> <span class="ruby-value">0</span>
<span class="ruby-identifier">t</span> = <span class="ruby-ivar">@waiting_list</span>.<span class="ruby-identifier">shift</span>
<span class="ruby-identifier">t</span>.<span class="ruby-identifier">wakeup</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">t</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">rescue</span> <span class="ruby-constant">ThreadError</span>
<span class="ruby-keyword kw">retry</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">self</span>
<span class="ruby-keyword kw">ensure</span>
<span class="ruby-constant">Thread</span>.<span class="ruby-identifier">critical</span> = <span class="ruby-keyword kw">false</span>
<span class="ruby-keyword kw">end</span></pre>
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