queue.html 19.4 KB
Newer Older
1 2


Y
Yu Yang 已提交
3 4 5 6 7 8 9 10
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    
11
    <title>Queue &#8212; PaddlePaddle  documentation</title>
Y
Yu Yang 已提交
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
    
    <link rel="stylesheet" href="../../_static/classic.css" type="text/css" />
    <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
    
    <script type="text/javascript">
      var DOCUMENTATION_OPTIONS = {
        URL_ROOT:    '../../',
        VERSION:     '',
        COLLAPSE_INDEX: false,
        FILE_SUFFIX: '.html',
        HAS_SOURCE:  true
      };
    </script>
    <script type="text/javascript" src="../../_static/jquery.js"></script>
    <script type="text/javascript" src="../../_static/underscore.js"></script>
    <script type="text/javascript" src="../../_static/doctools.js"></script>
    <script type="text/javascript" src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
29 30
    <link rel="index" title="Index" href="../../genindex.html" />
    <link rel="search" title="Search" href="../../search.html" />
Y
Yu Yang 已提交
31 32 33 34
    <link rel="top" title="PaddlePaddle  documentation" href="../../index.html" />
    <link rel="up" title="Source Code Documents" href="../index.html" />
    <link rel="next" title="Lock" href="thread.html" />
    <link rel="prev" title="Thread" href="lock.html" /> 
35 36 37 38 39 40 41 42 43 44
<script>
var _hmt = _hmt || [];
(function() {
  var hm = document.createElement("script");
  hm.src = "//hm.baidu.com/hm.js?b9a314ab40d04d805655aab1deee08ba";
  var s = document.getElementsByTagName("script")[0]; 
  s.parentNode.insertBefore(hm, s);
})();
</script>

Y
Yu Yang 已提交
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
  </head>
  <body role="document">
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../../genindex.html" title="General Index"
             accesskey="I">index</a></li>
        <li class="right" >
          <a href="../../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="thread.html" title="Lock"
             accesskey="N">next</a> |</li>
        <li class="right" >
          <a href="lock.html" title="Thread"
             accesskey="P">previous</a> |</li>
62 63
        <li class="nav-item nav-item-0"><a href="../../index.html">PaddlePaddle  documentation</a> &#187;</li>
          <li class="nav-item nav-item-1"><a href="../index.html" accesskey="U">Source Code Documents</a> &#187;</li> 
Y
Yu Yang 已提交
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81
      </ul>
    </div>  

    <div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">
          <div class="body" role="main">
            
  <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>
82 83 84 85 86 87 88 89 90 91 92
<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>
<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>
Y
Yu Yang 已提交
93

94 95 96 97 98 99 100 101 102
<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>
Y
Yu Yang 已提交
103 104 105 106 107 108 109 110
</pre></div>
</div>
</p>
<div class="breathe-sectiondef container">
<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>
111
<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>
Y
Yu Yang 已提交
112 113 114 115 116 117 118 119 120 121
</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>
122
<dd><p>enqueue an element into <a class="reference internal" href="#paddleclasspaddle_1_1Queue"><span class="std std-ref">Queue</span></a>. </p>
Y
Yu Yang 已提交
123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
<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>
<dd><ul class="breatheparameterlist first last">
<li><code class="first docutils literal"><span class="pre">el</span></code> - <p>The enqueue element. </p>
</li>
</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>
139
<dd><p>enqueue an element into <a class="reference internal" href="#paddleclasspaddle_1_1Queue"><span class="std std-ref">Queue</span></a>. </p>
Y
Yu Yang 已提交
140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192
<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>
<dd><ul class="breatheparameterlist first last">
<li><code class="first docutils literal"><span class="pre">el</span></code> - <p>The enqueue element. rvalue reference . </p>
</li>
</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">
<dt id="_CPPv2N6paddle5Queue4sizeEv">
<span id="paddle::Queue::size"></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> const<a class="headerlink" href="#_CPPv2N6paddle5Queue4sizeEv" 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 not thread safe. Obviously this number can change by the time you actually look at it. </dd>
</dl>
</p>
</dd></dl>

<dl class="function">
<dt id="_CPPv2N6paddle5Queue5emptyEv">
<span id="paddle::Queue::empty"></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> const<a class="headerlink" href="#_CPPv2N6paddle5Queue5emptyEv" 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 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>

193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209
<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">
<li><code class="first docutils literal"><span class="pre">seconds</span></code> - <p>wait time limit. </p>
</li>
</ul>
</dd>
</dl>
</p>
</dd></dl>

Y
Yu Yang 已提交
210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240
</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>
<dd><div class="breathe-sectiondef container">
<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>
<dd><ul class="breatheparameterlist first last">
<li><code class="first docutils literal"><span class="pre">capacity</span></code> - <p>the max numer of elements the queue can have. </p>
</li>
</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>
241
<dd><p>enqueue an element into <a class="reference internal" href="#paddleclasspaddle_1_1Queue"><span class="std std-ref">Queue</span></a>. </p>
Y
Yu Yang 已提交
242 243
<p><dl class="docutils">
<dt><strong>Note</strong></dt>
244 245 246
<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>
Y
Yu Yang 已提交
247 248 249 250 251 252 253 254 255 256 257 258 259 260 261
<dt><strong>Parameters</strong></dt>
<dd><ul class="breatheparameterlist first last">
<li><code class="first docutils literal"><span class="pre">x</span></code> - <p>The enqueue element, pass by reference . </p>
</li>
</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>
262 263 264
<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>
Y
Yu Yang 已提交
265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329
</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>
</p>
</dd></dl>

</div>
</dd></dl>

</div>
</div>


          </div>
        </div>
      </div>
      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
        <div class="sphinxsidebarwrapper">
  <h3><a href="../../index.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">Queue</a><ul>
<li><a class="reference internal" href="#class-queue">class Queue</a></li>
<li><a class="reference internal" href="#class-blockingqueue">class BlockingQueue</a></li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
  <p class="topless"><a href="lock.html"
                        title="previous chapter">Thread</a></p>
  <h4>Next topic</h4>
  <p class="topless"><a href="thread.html"
                        title="next chapter">Lock</a></p>
  <div role="note" aria-label="source link">
    <h3>This Page</h3>
    <ul class="this-page-menu">
      <li><a href="../../_sources/source/utils/queue.txt"
            rel="nofollow">Show Source</a></li>
    </ul>
   </div>
<div id="searchbox" style="display: none" role="search">
  <h3>Quick search</h3>
    <form class="search" action="../../search.html" method="get">
330 331
      <div><input type="text" name="q" /></div>
      <div><input type="submit" value="Go" /></div>
Y
Yu Yang 已提交
332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355
      <input type="hidden" name="check_keywords" value="yes" />
      <input type="hidden" name="area" value="default" />
    </form>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
        </div>
      </div>
      <div class="clearer"></div>
    </div>
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../../genindex.html" title="General Index"
             >index</a></li>
        <li class="right" >
          <a href="../../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="thread.html" title="Lock"
             >next</a> |</li>
        <li class="right" >
          <a href="lock.html" title="Thread"
             >previous</a> |</li>
356 357
        <li class="nav-item nav-item-0"><a href="../../index.html">PaddlePaddle  documentation</a> &#187;</li>
          <li class="nav-item nav-item-1"><a href="../index.html" >Source Code Documents</a> &#187;</li> 
Y
Yu Yang 已提交
358 359 360
      </ul>
    </div>
    <div class="footer" role="contentinfo">
361
        &#169; Copyright 2016, PaddlePaddle developers.
362
      Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.4.8.
Y
Yu Yang 已提交
363 364 365
    </div>
  </body>
</html>