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<pre><span class="ruby-comment cmt"># File lib/rack/lock.rb, line 14</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-identifier">old</span>, <span class="ruby-identifier">env</span>[<span class="ruby-constant">FLAG</span>] = <span class="ruby-identifier">env</span>[<span class="ruby-constant">FLAG</span>], <span class="ruby-keyword kw">false</span>
<span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">lock</span>
<span class="ruby-identifier">response</span> = <span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-identifier">body</span> = <span class="ruby-constant">BodyProxy</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">response</span>[<span class="ruby-value">2</span>]) { <span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">unlock</span> }
<span class="ruby-identifier">response</span>[<span class="ruby-value">2</span>] = <span class="ruby-identifier">body</span>
<span class="ruby-identifier">response</span>
<span class="ruby-keyword kw">ensure</span>
<span class="ruby-ivar">@mutex</span>.<span class="ruby-identifier">unlock</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">body</span>
<span class="ruby-identifier">env</span>[<span class="ruby-constant">FLAG</span>] = <span class="ruby-identifier">old</span>
<span class="ruby-keyword kw">end</span></pre>
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