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<!DOCTYPE html>

<head>

<title>tf::BoundedTaskQueue class | Taskflow QuickStart</title>

</head>

<body>

<a href="https://taskflow.github.io"><img src="taskflow_logo.png" alt="" />Taskflow</a> <span class="m-breadcrumb">|</span> <a href="index.html" class="m-thin">QuickStart</a>

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<li><a href="pages.html">Handbook</a></li>

<li><a href="namespaces.html">Namespaces</a></li>

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<h1>

<div class="m-doc-include m-code m-inverted m-right-m m-text-right"><span class="cp">#include</span> <a class="cpf" href="tsq_8hpp.html"><taskflow/core/tsq.hpp></a></div>

<div class="m-doc-template">template<typename T, size_t LogSize = <a href="tsq_8hpp.html#a603f6f29f0f179ee85ecde7d5311a76e" class="m-doc">TF_<wbr />DEFAULT_<wbr />BOUNDED_<wbr />TASK_<wbr />QUEUE_<wbr />LOG_<wbr />SIZE</a>></div>

<span class="m-breadcrumb"><a href="namespacetf.html">tf</a>::<wbr/></span>BoundedTaskQueue <span class="m-thin">class</span>

</h1>

<p>class to create a lock-free bounded work-stealing queue</p>

<thead>

<tr><th colspan="2">Template parameters</th></tr>

</thead>

<tbody>

<tr>

</tr>

<tr>

<td>LogSize</td>

<td>the base-2 logarithm of the queue size</td>

</tr>

</tbody>

</table>

<h3>Contents</h3>

<ul>

<li>

Reference

<ul>

<li><a href="#typeless-methods">Constructors, destructors, conversion operators</a></li>

<li><a href="#pub-methods">Public functions</a></li>

</ul>

</li>

</ul>

</nav>

<p>This class implements the work-stealing queue described in the paper, "Correct and Efficient Work-Stealing for Weak Memory Models," available at <a href="https://www.di.ens.fr/~zappa/readings/ppopp13.pdf">https:/<wbr />/<wbr />www.di.ens.fr/<wbr />~zappa/<wbr />readings/<wbr />ppopp13.pdf</a>.</p><p>Only the queue owner can perform pop and push operations, while others can steal data from the queue.</p>

<h2><a href="#typeless-methods">Constructors, destructors, conversion operators</a></h2>

<span class="m-doc-wrap-bumper"><a href="#a4160bb42036d75bc60f95cc189792a3d" class="m-doc-self">BoundedTaskQueue</a>(</span><span class="m-doc-wrap">) <span class="m-label m-flat m-info">defaulted</span></span>

</dt>

<dd>constructs the queue with a given capacity</dd>

<span class="m-doc-wrap-bumper"><a href="#a5811b32810d0e70a1572a8ef594eba7e" class="m-doc-self">~BoundedTaskQueue</a>(</span><span class="m-doc-wrap">) <span class="m-label m-flat m-info">defaulted</span></span>

</dt>

<dd>destructs the queue</dd>

</dl>

</section>

<h2><a href="#pub-methods">Public functions</a></h2>

<span class="m-doc-wrap-bumper">auto <a href="#ae64ab051e9ce597482cb602ce967d459" class="m-doc-self">empty</a>(</span><span class="m-doc-wrap">) const -> bool <span class="m-label m-flat m-success">noexcept</span></span>

</dt>

<dd>queries if the queue is empty at the time of this call</dd>

<span class="m-doc-wrap-bumper">auto <a href="#a76620d4f4a85eae9e4626b9d83c61cb3" class="m-doc-self">size</a>(</span><span class="m-doc-wrap">) const -> size_t <span class="m-label m-flat m-success">noexcept</span></span>

</dt>

<dd>queries the number of items at the time of this call</dd>

<span class="m-doc-wrap-bumper">auto <a href="#ae3c7315f59e60f806225ee9cf8d55229" class="m-doc-self">capacity</a>(</span><span class="m-doc-wrap">) const -> size_t <span class="m-label m-flat m-primary">constexpr</span></span>

</dt>

<dd>queries the capacity of the queue</dd>

<dt>

<div class="m-doc-template">template<typename O></div>

</dt>

<dd>tries to insert an item to the queue</dd>

<dt>

<div class="m-doc-template">template<typename O, typename C></div>

<span class="m-doc-wrap-bumper">void <a href="#a9b0c93adcdeb0a876869027a211fdf62" class="m-doc">push</a>(</span><span class="m-doc-wrap">O&& item,

C&& on_full)</span>

</dt>

<dd>tries to insert an item to the queue or invoke the callable if fails</dd>

<dt>

</dt>

<dd>pops out an item from the queue</dd>

<dt>

<span class="m-doc-wrap-bumper">auto <a href="#ad2b4f8d262b0093ce08dea92c00fae1b" class="m-doc">steal</a>(</span><span class="m-doc-wrap">) -> T</span>

</dt>

<dd>steals an item from the queue</dd>

<dt>

<span class="m-doc-wrap-bumper">auto <a href="#a8dfccb6523bc07fe9955ddda5136836a" class="m-doc">steal_with_hint</a>(</span><span class="m-doc-wrap">size_t& num_empty_steals) -> T</span>

</dt>

<dd>attempts to steal a task with a hint mechanism</dd>

</dl>

</section>

<h2>Function documentation</h2>

<h3>

template<typename T, size_t LogSize>

template<typename O>

</div>

<span class="m-doc-wrap-bumper">bool tf::<wbr />BoundedTaskQueue<T, LogSize>::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#af52edec086b5e1a9c090eff6a6a76dae" class="m-doc-self">try_push</a>(</span><span class="m-doc-wrap">O&& item)</span></span>

</h3>

<p>tries to insert an item to the queue</p>

<thead>

<tr><th colspan="2">Template parameters</th></tr>

</thead>

<tbody>

<tr>

</tr>

</tbody>

<thead>

<tr><th colspan="2">Parameters</th></tr>

</thead>

<tbody>

<tr>

<td>the item to perfect-forward to the queue</td>

</tr>

</tbody>

<tfoot>

<tr>

<th>Returns</th>

<td><code>true</code> if the insertion succeed or <code>false</code> (queue is full)</td>

</tr>

</tfoot>

</table>

<p>Only the owner thread can insert an item to the queue.</p>

</div></section>

<h3>

template<typename T, size_t LogSize>

template<typename O, typename C>

</div>

<span class="m-doc-wrap-bumper">void tf::<wbr />BoundedTaskQueue<T, LogSize>::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#a9b0c93adcdeb0a876869027a211fdf62" class="m-doc-self">push</a>(</span><span class="m-doc-wrap">O&& item,

C&& on_full)</span></span>

</h3>

<p>tries to insert an item to the queue or invoke the callable if fails</p>

<thead>

<tr><th colspan="2">Template parameters</th></tr>

</thead>

<tbody>

<tr>

</tr>

<tr>

<td>callable type</td>

</tr>

</tbody>

<thead>

<tr><th colspan="2">Parameters</th></tr>

</thead>

<tbody>

<tr>

<td>the item to perfect-forward to the queue</td>

</tr>

<tr>

<td>callable to invoke when the queue is full (insertion fails)</td>

</tr>

</tbody>

</table>

<p>Only the owner thread can insert an item to the queue.</p>

</div></section>

<h3>

template<typename T, size_t LogSize>

</div>

<span class="m-doc-wrap-bumper">T tf::<wbr />BoundedTaskQueue<T, LogSize>::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#a2b9e1d2502b489656b89cb505e95e71b" class="m-doc-self">pop</a>(</span><span class="m-doc-wrap">)</span></span>

</h3>

<p>pops out an item from the queue</p>

<p>Only the owner thread can pop out an item from the queue. The return can be a <code>nullptr</code> if this operation failed (empty queue).</p>

</div></section>

<h3>

template<typename T, size_t LogSize>

</div>

<span class="m-doc-wrap-bumper">T tf::<wbr />BoundedTaskQueue<T, LogSize>::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#ad2b4f8d262b0093ce08dea92c00fae1b" class="m-doc-self">steal</a>(</span><span class="m-doc-wrap">)</span></span>

</h3>

<p>steals an item from the queue</p>

<p>Any threads can try to steal an item from the queue. The return can be a <code>nullptr</code> if this operation failed (not necessary empty).</p>

</div></section>

<h3>

template<typename T, size_t LogSize>

</div>

<span class="m-doc-wrap-bumper">T tf::<wbr />BoundedTaskQueue<T, LogSize>::<wbr /></span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#a8dfccb6523bc07fe9955ddda5136836a" class="m-doc-self">steal_with_hint</a>(</span><span class="m-doc-wrap">size_t& num_empty_steals)</span></span>

</h3>

<p>attempts to steal a task with a hint mechanism</p>

<thead>

<tr><th colspan="2">Parameters</th></tr>

</thead>

<tbody>

<tr>

<td style="width: 1%">num_empty_steals</td>

<td>a reference to a counter tracking consecutive empty steal attempts</td>

</tr>

</tbody>

</table>

<p>This function tries to steal a task from the queue. If the steal attempt is successful, the stolen task is returned. Additionally, if the queue is empty, the provided counter <code>num_empty_steals</code> is incremented; otherwise, <code>num_empty_steals</code> is reset to zero.</p>

</div></section>

</section>

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