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<title>Parallel Patterns Library</title>
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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Parallel Patterns Library</span></span>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p>The <b>Parallel Patterns Library</b> is a <a href="Microsoft" title="Microsoft">Microsoft</a> library designed for use by native C++ developers that provides features for <a href="Multicore_programming" class="mw-redirect" title="Multicore programming">multicore programming</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> It was first bundled with <a href="Visual_Studio_2010" class="mw-redirect" title="Visual Studio 2010">Visual Studio 2010</a>. It resembles the <a href="C%2B%2B_Standard_Library" title="C++ Standard Library">C++ Standard Library</a> in style and works well with the C++11 language feature, lambdas, also introduced with <a href="Visual_Studio_2010" class="mw-redirect" title="Visual Studio 2010">Visual Studio 2010</a>.
</p><p>For example, this sequential loop:
</p>
<div class="mw-highlight mw-highlight-lang-cpp mw-content-ltr" dir="ltr"><pre><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="n">width</span><span class="p">;</span><span class="w"> </span><span class="o">++</span><span class="n">x</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="c1">// Something parallelizable</span>
<span class="p">}</span>
</pre></div>
<p>Can be made into a parallel loop by replacing the for with a <code>parallel_for</code>:
</p>
<div class="mw-highlight mw-highlight-lang-cpp mw-content-ltr" dir="ltr"><pre><span class="cp">#include</span><span class="w"> </span><span class="cpf"><ppl.h></span>
<span class="c1">// . . .</span>
<span class="n">Concurrency</span><span class="o">::</span><span class="n">parallel_for</span><span class="w"> </span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="n">width</span><span class="p">,</span><span class="w"> </span><span class="p">[</span><span class="o">=</span><span class="p">](</span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="c1">// Something parallelizable</span>
<span class="p">});</span>
</pre></div>
<p>This still requires the developer to know that the loop is parallelizable, but all the other work is done by the library.
</p><p>MSDN<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> describes the Parallel Patterns Library as an "imperative programming model that promotes scalability and ease-of-use for developing concurrent applications." It uses the Concurrency Runtime for scheduling and resource management and provides generic, type-safe algorithms and containers for use in parallel applications.
</p>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20111008024206/http://paper.li/visualc/news/2011/03/12">"The Visual C++ Weekly"</a>. March 12, 2011. Archived from <a rel="nofollow" class="external text" href="http://paper.li/visualc/news/2011/03/12">the original</a> on October 8, 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">August 14,</span> 2011</span>.</cite></span>
</li>
<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://msdn.microsoft.com/en-us/library/dd492418.aspx">"Parallel Patterns Library (PPL) on MSDN"</a>. 3 August 2021.</cite> </span>
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