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<meta name="DC.Title" content="Threads">
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<title>Threads</title>
</head>
<body id="threads">
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<h1 class="topictitle1">Threads</h1>
<div>
<div class="section">
<p>Intel® Threading Building Blocks (Intel® TBB)
provides a wrapper around the platform's native threads, based upon the N3000
working draft for C++11. Using this wrapper has two benefits:
</p>
<ul type="disc">
<li>
<p>It makes threaded code portable across
platforms.
</p>
</li>
<li>
<p>It eases later migration to ISO C++11
threads.
</p>
</li>
</ul>
<p>The library defines the wrapper in namespace
<samp class="codeph">std</samp>, not namespace
<samp class="codeph">tbb</samp>, as explained in Section Namespace.
</p>
<p>The significant departures from N3000 are shown in
the table below.
</p>
<div class="tablenoborder"><a name="tbl36"><!-- --></a><table cellpadding="4" summary="" id="tbl36" width="100%" frame="hsides" border="1" rules="all"><caption><span class="tablecap">Differences Between N3000 and Intel® TBB
Thread Class</span></caption>
<thead align="left">
<tr>
<th class="cellrowborder" valign="top" width="NaN%" id="d123197e64">
<p>N3000
</p>
</th>
<th class="row-nocellborder" valign="top" width="NaN%" id="d123197e70">
<p>Intel® TBB
</p>
</th>
</tr>
</thead>
<tbody>
<tr>
<td class="cellrowborder" valign="top" width="NaN%" headers="d123197e64 ">
<p><samp class="codeph">template<class Rep, class
Period> std::this_thread::sleep_for(</samp>
</p>
<p><samp class="codeph">const chrono::duration<Rep,
Period>& rel_time)</samp>
</p>
</td>
<td class="row-nocellborder" valign="top" width="NaN%" headers="d123197e70 ">
<p><samp class="codeph">std::this_thread::sleep_for(
tick_count::interval_t )</samp>
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="NaN%" headers="d123197e64 ">
<p>rvalue reference parameters
</p>
</td>
<td class="row-nocellborder" valign="top" width="NaN%" headers="d123197e70 ">
<p>Parameter changed to plain value, or
function removed, as appropriate.
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="NaN%" headers="d123197e64 ">
<p>constructor for
<samp class="codeph">std::thread</samp> takes arbitrary number of
arguments.
</p>
</td>
<td class="row-nocellborder" valign="top" width="NaN%" headers="d123197e70 ">
<p>constructor for
<samp class="codeph">std::thread</samp> takes 0-3 arguments.
</p>
</td>
</tr>
</tbody>
</table>
</div>
<p>The other changes are for compatibility with the
current C++ standard or Intel® TBB. For example, constructors that have an
arbitrary number of arguments require the variadic template features of C++11.
</p>
<div class="Note"><h3 class="NoteTipHead">
Caution</h3>
<p>Threads are heavy weight entities on most
systems, and running too many threads on a system can seriously degrade
performance. Consider using a task based solution instead if practical.
</p>
</div>
</div>
</div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="../reference/reference.htm">Intel® Threading Building Blocks Reference Manual</a></div>
</div>
<div class="See Also">
<ul class="ullinks">
<li class="ulchildlink"><a href="../reference/threads/thread_cls.htm">thread Class</a><br>
</li>
<li class="ulchildlink"><a href="../reference/threads/thread_id.htm">thread::id</a><br>
</li>
<li class="ulchildlink"><a href="../reference/threads/this_thread_namespace.htm">this_thread Namespace</a><br>
</li>
</ul>
<h2>See Also</h2>
<div class="linklist">
<div><a href="general_conventions/namespaces.htm">Namespaces, std Namespace
</a></div></div>
</div>
</body>
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