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  <div class="section" id="queue">
<h1>Queue<a class="headerlink" href="#queue" title="Permalink to this headline"></a></h1>
<div class="section" id="class-queue">
<h2>class Queue<a class="headerlink" href="#class-queue" title="Permalink to this headline"></a></h2>
<dl class="class">
<dt>
<span class="target" id="paddleclasspaddle_1_1Queue"></span><em class="property">template </em>&lt;class <em>T</em>&gt;</dt>
<dt id="_CPPv2N6paddle5QueueE">
<span id="paddle::Queue"></span><em class="property">class </em><code class="descclassname">paddle::</code><code class="descname">Queue</code><a class="headerlink" href="#_CPPv2N6paddle5QueueE" title="Permalink to this definition"></a></dt>
<dd><p>A thread-safe queue that automatically grows but never shrinks. Dequeue a empty queue will block current thread. Enqueue an element will wake up another thread that blocked by dequeue method.</p>
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<p>For example. <div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">paddle</span><span class="p">::</span><span class="n">Queue</span><span class="o">&lt;</span><span class="nb">int</span><span class="o">&gt;</span> <span class="n">q</span><span class="p">;</span>
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<span class="n">END_OF_JOB</span><span class="o">=-</span><span class="mi">1</span>
<span class="n">void</span> <span class="n">thread1</span><span class="p">()</span> <span class="p">{</span>
  <span class="k">while</span> <span class="p">(</span><span class="n">true</span><span class="p">)</span> <span class="p">{</span>
    <span class="n">auto</span> <span class="n">job</span> <span class="o">=</span> <span class="n">q</span><span class="o">.</span><span class="n">dequeue</span><span class="p">();</span>
    <span class="k">if</span> <span class="p">(</span><span class="n">job</span> <span class="o">==</span> <span class="n">END_OF_JOB</span><span class="p">)</span> <span class="p">{</span>
      <span class="k">break</span><span class="p">;</span>
    <span class="p">}</span>
    <span class="n">processJob</span><span class="p">(</span><span class="n">job</span><span class="p">);</span>
  <span class="p">}</span>
<span class="p">}</span>
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<span class="n">void</span> <span class="n">thread2</span><span class="p">()</span> <span class="p">{</span>
  <span class="k">while</span> <span class="p">(</span><span class="n">true</span><span class="p">)</span> <span class="p">{</span>
     <span class="n">auto</span> <span class="n">job</span> <span class="o">=</span> <span class="n">getJob</span><span class="p">();</span>
     <span class="n">q</span><span class="o">.</span><span class="n">enqueue</span><span class="p">(</span><span class="n">job</span><span class="p">);</span>
     <span class="k">if</span> <span class="p">(</span><span class="n">job</span> <span class="o">==</span> <span class="n">END_OF_JOB</span><span class="p">)</span> <span class="p">{</span>
       <span class="k">break</span><span class="p">;</span>
     <span class="p">}</span>
  <span class="p">}</span>
<span class="p">}</span>
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</pre></div>
</div>
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 </p>
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<div class="breathe-sectiondef docutils container">
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<p class="breathe-sectiondef-title rubric">Public Functions</p>
<dl class="function">
<dt id="_CPPv2N6paddle5Queue5QueueEv">
<span id="paddle::Queue::Queue"></span><span class="target" id="paddleclasspaddle_1_1Queue_1a4f635b36dbf76eca675be69de3eda18a"></span><code class="descname">Queue</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle5Queue5QueueEv" title="Permalink to this definition"></a></dt>
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<dd><p>Construct Function. Default capacity of <a class="reference internal" href="#paddleclasspaddle_1_1Queue"><span class="std std-ref">Queue</span></a> is zero. </p>
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</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle5QueueD0Ev">
<span id="paddle::Queue::~Queue"></span><span class="target" id="paddleclasspaddle_1_1Queue_1a6d5171d804a7e7d691467f863d25699a"></span><code class="descname">~Queue</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle5QueueD0Ev" title="Permalink to this definition"></a></dt>
<dd></dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle5Queue7enqueueERK1T">
<span id="paddle::Queue::enqueue__TCR"></span><span class="target" id="paddleclasspaddle_1_1Queue_1ab7feef122fb9fff3c0009e7830fa432a"></span>void <code class="descname">enqueue</code><span class="sig-paren">(</span><em class="property">const</em> T &amp;<em>el</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle5Queue7enqueueERK1T" title="Permalink to this definition"></a></dt>
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<dd><p>enqueue an element into <a class="reference internal" href="#paddleclasspaddle_1_1Queue"><span class="std std-ref">Queue</span></a>. </p>
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<p><dl class="docutils">
<dt><strong>Note</strong></dt>
<dd>This method is thread-safe, and will wake up another blocked thread. </dd>
<dt><strong>Parameters</strong></dt>
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<dd><ul class="breatheparameterlist first last simple">
<li><code class="docutils literal"><span class="pre">el</span></code>: The enqueue element. </li>
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</ul>
</dd>
</dl>
</p>
</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle5Queue7enqueueERR1T">
<span id="paddle::Queue::enqueue__TRR"></span><span class="target" id="paddleclasspaddle_1_1Queue_1a364dd46c374795465b79044df4ef3056"></span>void <code class="descname">enqueue</code><span class="sig-paren">(</span>T &amp;&amp;<em>el</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle5Queue7enqueueERR1T" title="Permalink to this definition"></a></dt>
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<dd><p>enqueue an element into <a class="reference internal" href="#paddleclasspaddle_1_1Queue"><span class="std std-ref">Queue</span></a>. </p>
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<p><dl class="docutils">
<dt><strong>Note</strong></dt>
<dd>This method is thread-safe, and will wake up another blocked thread. </dd>
<dt><strong>Parameters</strong></dt>
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<dd><ul class="breatheparameterlist first last simple">
<li><code class="docutils literal"><span class="pre">el</span></code>: The enqueue element. rvalue reference . </li>
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</ul>
</dd>
</dl>
</p>
</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle5Queue7dequeueEv">
<span id="paddle::Queue::dequeue"></span><span class="target" id="paddleclasspaddle_1_1Queue_1a3c4ed6257434fa448db9cf6a800c770f"></span>T <code class="descname">dequeue</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle5Queue7dequeueEv" title="Permalink to this definition"></a></dt>
<dd><p>Dequeue from a queue and return a element. <dl class="docutils">
<dt><strong>Note</strong></dt>
<dd>this method will be blocked until not empty. </dd>
</dl>
</p>
</dd></dl>

<dl class="function">
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<dt id="_CPPv2NK6paddle5Queue4sizeEv">
<span id="paddle::Queue::sizeC"></span><span class="target" id="paddleclasspaddle_1_1Queue_1ad156d8247d2c476e1147fc63b9365220"></span>int <code class="descname">size</code><span class="sig-paren">(</span><span class="sig-paren">)</span> <em class="property">const</em><a class="headerlink" href="#_CPPv2NK6paddle5Queue4sizeEv" title="Permalink to this definition"></a></dt>
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<dd><p>Return size of queue.</p>
<p><dl class="docutils">
<dt><strong>Note</strong></dt>
<dd>This method is not thread safe. Obviously this number can change by the time you actually look at it. </dd>
</dl>
</p>
</dd></dl>

<dl class="function">
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<dt id="_CPPv2NK6paddle5Queue5emptyEv">
<span id="paddle::Queue::emptyC"></span><span class="target" id="paddleclasspaddle_1_1Queue_1a3926bc21e5fd4e3a9361e05ce3c48b3e"></span>bool <code class="descname">empty</code><span class="sig-paren">(</span><span class="sig-paren">)</span> <em class="property">const</em><a class="headerlink" href="#_CPPv2NK6paddle5Queue5emptyEv" title="Permalink to this definition"></a></dt>
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<dd><p>is empty or not. </p>
<p><dl class="docutils">
<dt><strong>Return</strong></dt>
<dd>true if empty. </dd>
<dt><strong>Note</strong></dt>
<dd>This method is not thread safe. </dd>
</dl>
</p>
</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle5Queue9waitEmptyEv">
<span id="paddle::Queue::waitEmpty"></span><span class="target" id="paddleclasspaddle_1_1Queue_1a96aa776b63591273bf78308947d05467"></span>void <code class="descname">waitEmpty</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle5Queue9waitEmptyEv" title="Permalink to this definition"></a></dt>
<dd><p>wait util queue is empty </p>
</dd></dl>
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<dl class="function">
<dt id="_CPPv2N6paddle5Queue15waitNotEmptyForEi">
<span id="paddle::Queue::waitNotEmptyFor__i"></span><span class="target" id="paddleclasspaddle_1_1Queue_1a2e21790ab2a03898307814c188ddcac1"></span>bool <code class="descname">waitNotEmptyFor</code><span class="sig-paren">(</span>int <em>seconds</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle5Queue15waitNotEmptyForEi" title="Permalink to this definition"></a></dt>
<dd><p>wait queue is not empty at most for some seconds. </p>
<p><dl class="docutils">
<dt><strong>Return</strong></dt>
<dd>true if queue is not empty. false if timeout. </dd>
<dt><strong>Parameters</strong></dt>
<dd><ul class="breatheparameterlist first last simple">
<li><code class="docutils literal"><span class="pre">seconds</span></code>: wait time limit. </li>
</ul>
</dd>
</dl>
</p>
</dd></dl>
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</div>
</dd></dl>

</div>
<div class="section" id="class-blockingqueue">
<h2>class BlockingQueue<a class="headerlink" href="#class-blockingqueue" title="Permalink to this headline"></a></h2>
<dl class="class">
<dt>
<span class="target" id="paddleclasspaddle_1_1BlockingQueue"></span><em class="property">template </em>&lt;typename <em>T</em>&gt;</dt>
<dt id="_CPPv2N6paddle13BlockingQueueE">
<span id="paddle::BlockingQueue"></span><em class="property">class </em><code class="descclassname">paddle::</code><code class="descname">BlockingQueue</code><a class="headerlink" href="#_CPPv2N6paddle13BlockingQueueE" title="Permalink to this definition"></a></dt>
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<dd><div class="breathe-sectiondef docutils container">
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<p class="breathe-sectiondef-title rubric">Public Functions</p>
<dl class="function">
<dt id="_CPPv2N6paddle13BlockingQueue13BlockingQueueE6size_t">
<span id="paddle::BlockingQueue::BlockingQueue__s"></span><span class="target" id="paddleclasspaddle_1_1BlockingQueue_1aea985aef6eae7bbf2e075140d00caff2"></span><code class="descname">BlockingQueue</code><span class="sig-paren">(</span>size_t <em>capacity</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle13BlockingQueue13BlockingQueueE6size_t" title="Permalink to this definition"></a></dt>
<dd><p>Construct Function. </p>
<p><dl class="docutils">
<dt><strong>Parameters</strong></dt>
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<dd><ul class="breatheparameterlist first last simple">
<li><code class="docutils literal"><span class="pre">capacity</span></code>: the max numer of elements the queue can have. </li>
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</ul>
</dd>
</dl>
</p>
</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle13BlockingQueue7enqueueERK1T">
<span id="paddle::BlockingQueue::enqueue__TCR"></span><span class="target" id="paddleclasspaddle_1_1BlockingQueue_1ae342ffe1695f6fd71f7cd6533436de3d"></span>void <code class="descname">enqueue</code><span class="sig-paren">(</span><em class="property">const</em> T &amp;<em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle13BlockingQueue7enqueueERK1T" title="Permalink to this definition"></a></dt>
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<dd><p>enqueue an element into <a class="reference internal" href="#paddleclasspaddle_1_1Queue"><span class="std std-ref">Queue</span></a>. </p>
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<p><dl class="docutils">
<dt><strong>Note</strong></dt>
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<dd><p class="first">This method is thread-safe, and will wake up another thread who was blocked because of the queue is empty. </p>
<p class="last">If it&#8217;s <a class="reference internal" href="#paddleclasspaddle_1_1BlockingQueue_1a896e557a322cd5583491e2a603f462f9"><span class="std std-ref">size()</span></a> &gt;= capacity before enqueue, this method will block and wait until <a class="reference internal" href="#paddleclasspaddle_1_1BlockingQueue_1a896e557a322cd5583491e2a603f462f9"><span class="std std-ref">size()</span></a> &lt; capacity. </p>
</dd>
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<dt><strong>Parameters</strong></dt>
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<dd><ul class="breatheparameterlist first last simple">
<li><code class="docutils literal"><span class="pre">x</span></code>: The enqueue element, pass by reference . </li>
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</ul>
</dd>
</dl>
</p>
</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle13BlockingQueue7dequeueEv">
<span id="paddle::BlockingQueue::dequeue"></span><span class="target" id="paddleclasspaddle_1_1BlockingQueue_1a5e3a8bafedde4c154eab3310b42d66cd"></span>T <code class="descname">dequeue</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle13BlockingQueue7dequeueEv" title="Permalink to this definition"></a></dt>
<dd><p>Dequeue from a queue and return a element. <dl class="docutils">
<dt><strong>Note</strong></dt>
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<dd><p class="first">this method will be blocked until not empty. </p>
<p class="last">this method will wake up another thread who was blocked because of the queue is full. </p>
</dd>
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</dl>
</p>
</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle13BlockingQueue4sizeEv">
<span id="paddle::BlockingQueue::size"></span><span class="target" id="paddleclasspaddle_1_1BlockingQueue_1a896e557a322cd5583491e2a603f462f9"></span>size_t <code class="descname">size</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle13BlockingQueue4sizeEv" title="Permalink to this definition"></a></dt>
<dd><p>Return size of queue.</p>
<p><dl class="docutils">
<dt><strong>Note</strong></dt>
<dd>This method is thread safe. The size of the queue won&#8217;t change until the method return. </dd>
</dl>
</p>
</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle13BlockingQueue5emptyEv">
<span id="paddle::BlockingQueue::empty"></span><span class="target" id="paddleclasspaddle_1_1BlockingQueue_1a80485c3c5cf957833ac49773d4efd0f2"></span>size_t <code class="descname">empty</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv2N6paddle13BlockingQueue5emptyEv" title="Permalink to this definition"></a></dt>
<dd><p>is empty or not. </p>
<p><dl class="docutils">
<dt><strong>Return</strong></dt>
<dd>true if empty. </dd>
<dt><strong>Note</strong></dt>
<dd>This method is thread safe. </dd>
</dl>
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