<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Class template spsc_queue</title> <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../lockfree/reference.html#header.boost.lockfree.spsc_queue_hpp" title="Header <boost/lockfree/spsc_queue.hpp>"> <link rel="prev" href="queue.html" title="Class template queue"> <link rel="next" href="stack.html" title="Class template stack"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> <td 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class="refentrytitle">Class template spsc_queue</span></h2> <p>boost::lockfree::spsc_queue</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../lockfree/reference.html#header.boost.lockfree.spsc_queue_hpp" title="Header <boost/lockfree/spsc_queue.hpp>">boost/lockfree/spsc_queue.hpp</a>> </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="special">...</span> Options<span class="special">></span> <span class="keyword">class</span> <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> <span class="special">{</span> <span class="keyword">public</span><span class="special">:</span> <span class="comment">// types</span> <span class="keyword">typedef</span> <span class="identifier">T</span> <a name="boost.lockfree.spsc_queue.value_type"></a><span class="identifier">value_type</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">implementation_defined</span><span class="special">::</span><span class="identifier">allocator</span> <a name="boost.lockfree.spsc_queue.allocator"></a><span class="identifier">allocator</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">implementation_defined</span><span class="special">::</span><span class="identifier">size_type</span> <a name="boost.lockfree.spsc_queue.size_type"></a><span class="identifier">size_type</span><span class="special">;</span> <span class="comment">// <a class="link" href="spsc_queue.html#boost.lockfree.spsc_queueconstruct-copy-destruct">construct/copy/destruct</a></span> <a class="link" href="spsc_queue.html#idm45507107495280-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="keyword">void</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="spsc_queue.html#idm45507087313776-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">allocator</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">rebind</span><span class="special"><</span> <span class="identifier">U</span> <span class="special">></span><span class="special">::</span><span class="identifier">other</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">explicit</span> <a class="link" href="spsc_queue.html#idm45507038359536-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="identifier">allocator</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">explicit</span> <a class="link" href="spsc_queue.html#idm45507038358288-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a class="link" href="spsc_queue.html#idm45506995441008-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">allocator</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">rebind</span><span class="special"><</span> <span class="identifier">U</span> <span class="special">></span><span class="special">::</span><span class="identifier">other</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <a class="link" href="spsc_queue.html#idm45506993804528-bb"><span class="identifier">spsc_queue</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">allocator_arg</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="comment">// <a class="link" href="spsc_queue.html#idm45506988663104-bb">public member functions</a></span> <span class="keyword">bool</span> <a class="link" href="spsc_queue.html#idm45506988662544-bb"><span class="identifier">push</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">bool</span> <a class="link" href="spsc_queue.html#idm45507043477216-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="spsc_queue.html#idm45507087812368-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="identifier">U</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#idm45507101939712-bb"><span class="identifier">push</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="identifier">size_type</span> size<span class="special">></span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#idm45506993816736-bb"><span class="identifier">push</span></a><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">(</span><span class="special">&</span><span class="special">)</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ConstIterator<span class="special">></span> <span class="identifier">ConstIterator</span> <a class="link" href="spsc_queue.html#idm45506988958016-bb"><span class="identifier">push</span></a><span class="special">(</span><span class="identifier">ConstIterator</span><span class="special">,</span> <span class="identifier">ConstIterator</span><span class="special">)</span><span class="special">;</span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#idm45507110194336-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="identifier">T</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="identifier">size_type</span> size<span class="special">></span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#idm45507037778928-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="identifier">T</span><span class="special">(</span><span class="special">&</span><span class="special">)</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> OutputIterator<span class="special">></span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">disable_if</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">OutputIterator</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="spsc_queue.html#idm45507040402640-bb"><span class="identifier">pop</span></a><span class="special">(</span><span class="identifier">OutputIterator</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a class="link" href="spsc_queue.html#idm45507095976688-bb"><span class="identifier">consume_one</span></a><span class="special">(</span><span class="identifier">Functor</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a class="link" href="spsc_queue.html#idm45507099122096-bb"><span class="identifier">consume_one</span></a><span class="special">(</span><span class="identifier">Functor</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#idm45506992027040-bb"><span class="identifier">consume_all</span></a><span class="special">(</span><span class="identifier">Functor</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#idm45506988970144-bb"><span class="identifier">consume_all</span></a><span class="special">(</span><span class="identifier">Functor</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#idm45506984939280-bb"><span class="identifier">read_available</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="identifier">size_type</span> <a class="link" href="spsc_queue.html#idm45506984936016-bb"><span class="identifier">write_available</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&</span> <a class="link" href="spsc_queue.html#idm45506979615200-bb"><span class="identifier">front</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="identifier">T</span> <span class="special">&</span> <a class="link" href="spsc_queue.html#idm45507163074288-bb"><span class="identifier">front</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span> <span class="keyword">void</span> <a class="link" href="spsc_queue.html#idm45507037474672-bb"><span class="identifier">reset</span></a><span class="special">(</span><span class="keyword">void</span><span class="special">)</span><span class="special">;</span> <span class="special">}</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="idm45555235644768"></a><h2>Description</h2> <p>The <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> class provides a single-writer/single-reader fifo queue, pushing and popping is wait-free.</p> <p><span class="bold"><strong>Policies:</strong></span> </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"><p><code class="computeroutput">boost::lockfree::capacity<></code>, optional <br> If this template argument is passed to the options, the size of the ringbuffer is set at compile-time.</p></li> <li class="listitem"><p><code class="computeroutput">boost::lockfree::allocator<></code>, defaults to <code class="computeroutput"><a class="link" href="allocator.html" title="Struct template allocator">boost::lockfree::allocator</a><std::allocator<T>></code> <br> Specifies the allocator that is used to allocate the ringbuffer. This option is only valid, if the ringbuffer is configured to be sized at run-time</p></li> </ul></div> <p> </p> <p><span class="bold"><strong>Requirements:</strong></span> </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"><p>T must have a default constructor</p></li> <li class="listitem"><p>T must be copyable </p></li> </ul></div> <p> </p> <div class="refsect2"> <a name="idm45555235635632"></a><h3> <a name="boost.lockfree.spsc_queueconstruct-copy-destruct"></a><code class="computeroutput">spsc_queue</code> public construct/copy/destruct</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><a name="idm45507107495280-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="keyword">void</span><span class="special">)</span><span class="special">;</span></pre> <p>Constructs a <code class="computeroutput"><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></code></p> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Requires:</span></p></td> <td><p><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> must be configured to be sized at compile-time </p></td> </tr></tbody> </table></div> </li> <li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <span class="keyword">explicit</span> <a name="idm45507087313776-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">allocator</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">rebind</span><span class="special"><</span> <span class="identifier">U</span> <span class="special">></span><span class="special">::</span><span class="identifier">other</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span></pre></li> <li class="listitem"><pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45507038359536-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="identifier">allocator</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span></pre></li> <li class="listitem"> <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45507038358288-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="identifier">size_type</span> element_count<span class="special">)</span><span class="special">;</span></pre> <p>Constructs a <code class="computeroutput"><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></code> for element_count elements</p> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Requires:</span></p></td> <td><p><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> must be configured to be sized at run-time </p></td> </tr></tbody> </table></div> </li> <li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <a name="idm45506995441008-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="identifier">size_type</span> element_count<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">allocator</span><span class="special">::</span><span class="keyword">template</span> <span class="identifier">rebind</span><span class="special"><</span> <span class="identifier">U</span> <span class="special">></span><span class="special">::</span><span class="identifier">other</span> <span class="keyword">const</span> <span class="special">&</span> alloc<span class="special">)</span><span class="special">;</span></pre></li> <li class="listitem"><pre class="literallayout"><a name="idm45506993804528-bb"></a><span class="identifier">spsc_queue</span><span class="special">(</span><span class="identifier">size_type</span> element_count<span class="special">,</span> <span class="identifier">allocator_arg</span> <span class="keyword">const</span> <span class="special">&</span> alloc<span class="special">)</span><span class="special">;</span></pre></li> </ol></div> </div> <div class="refsect2"> <a name="idm45555235573856"></a><h3> <a name="idm45506988663104-bb"></a><code class="computeroutput">spsc_queue</code> public member functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45506988662544-bb"></a><span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> t<span class="special">)</span><span class="special">;</span></pre> <p>Pushes object t to the ringbuffer.</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to push data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Postconditions:</span></p></td> <td><p>object will be pushed to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a>, unless it is full. </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>true, if the push operation is successful.</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45507043477216-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> <p>Pops one object from ringbuffer.</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Postconditions:</span></p></td> <td><p>if ringbuffer is not empty, object will be discarded. </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>true, if the pop operation is successful, false if ringbuffer was empty.</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> U<span class="special">></span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_if</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">bool</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="idm45507087812368-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="identifier">U</span> <span class="special">&</span> ret<span class="special">)</span><span class="special">;</span></pre> <p>Pops one object from ringbuffer.</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Postconditions:</span></p></td> <td><p>if ringbuffer is not empty, object will be copied to ret. </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>true, if the pop operation is successful, false if ringbuffer was empty.</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">size_type</span> <a name="idm45507101939712-bb"></a><span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">*</span> t<span class="special">,</span> <span class="identifier">size_type</span> size<span class="special">)</span><span class="special">;</span></pre> <p>Pushes as many objects from the array t as there is space.</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to push data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of pushed items</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="identifier">size_type</span> size<span class="special">></span> <span class="identifier">size_type</span> <a name="idm45506993816736-bb"></a><span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">(</span><span class="special">&</span><span class="special">)</span> t<span class="special">)</span><span class="special">;</span></pre> <p>Pushes as many objects from the array t as there is space available.</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to push data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of pushed items</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> ConstIterator<span class="special">></span> <span class="identifier">ConstIterator</span> <a name="idm45506988958016-bb"></a><span class="identifier">push</span><span class="special">(</span><span class="identifier">ConstIterator</span> begin<span class="special">,</span> <span class="identifier">ConstIterator</span> end<span class="special">)</span><span class="special">;</span></pre> <p>Pushes as many objects from the range [begin, end) as there is space .</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to push data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>iterator to the first element, which has not been pushed</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">size_type</span> <a name="idm45507110194336-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="identifier">T</span> <span class="special">*</span> ret<span class="special">,</span> <span class="identifier">size_type</span> size<span class="special">)</span><span class="special">;</span></pre> <p>Pops a maximum of size objects from ringbuffer.</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of popped items</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="identifier">size_type</span> size<span class="special">></span> <span class="identifier">size_type</span> <a name="idm45507037778928-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="identifier">T</span><span class="special">(</span><span class="special">&</span><span class="special">)</span> ret<span class="special">)</span><span class="special">;</span></pre> <p>Pops a maximum of size objects from <code class="computeroutput"><a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></code>.</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of popped items</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> OutputIterator<span class="special">></span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">disable_if</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">OutputIterator</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="idm45507040402640-bb"></a><span class="identifier">pop</span><span class="special">(</span><span class="identifier">OutputIterator</span> it<span class="special">)</span><span class="special">;</span></pre> <p>Pops objects to the output iterator it</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only one thread is allowed to pop data to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a> </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of popped items</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a name="idm45507095976688-bb"></a><span class="identifier">consume_one</span><span class="special">(</span><span class="identifier">Functor</span> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre> <p>consumes one element via a functor</p> <p>pops one element from the queue and applies the functor on this object</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and non-blocking, if functor is thread-safe and non-blocking </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Returns:</span></p></td> <td><p>true, if one element was consumed</p></td> </tr></tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="keyword">bool</span> <a name="idm45507099122096-bb"></a><span class="identifier">consume_one</span><span class="special">(</span><span class="identifier">Functor</span> <span class="keyword">const</span> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre> <p>consumes one element via a functor</p> <p>pops one element from the queue and applies the functor on this object</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and non-blocking, if functor is thread-safe and non-blocking </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Returns:</span></p></td> <td><p>true, if one element was consumed</p></td> </tr></tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">size_type</span> <a name="idm45506992027040-bb"></a><span class="identifier">consume_all</span><span class="special">(</span><span class="identifier">Functor</span> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre> <p>consumes all elements via a functor</p> <p>sequentially pops all elements from the queue and applies the functor on each object</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and non-blocking, if functor is thread-safe and non-blocking </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of elements that are consumed</p></td> </tr></tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Functor<span class="special">></span> <span class="identifier">size_type</span> <a name="idm45506988970144-bb"></a><span class="identifier">consume_all</span><span class="special">(</span><span class="identifier">Functor</span> <span class="keyword">const</span> <span class="special">&</span> f<span class="special">)</span><span class="special">;</span></pre> <p>consumes all elements via a functor</p> <p>sequentially pops all elements from the queue and applies the functor on each object</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and non-blocking, if functor is thread-safe and non-blocking </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of elements that are consumed</p></td> </tr></tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">size_type</span> <a name="idm45506984939280-bb"></a><span class="identifier">read_available</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>get number of elements that are available for read</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free, should only be called from the consumer thread </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of available elements that can be popped from the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></p></td> </tr></tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">size_type</span> <a name="idm45506984936016-bb"></a><span class="identifier">write_available</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>get write space to write elements</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free, should only be called from the producer thread </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody><tr> <td><p><span class="term">Returns:</span></p></td> <td><p>number of elements that can be pushed to the <a class="link" href="spsc_queue.html" title="Class template spsc_queue">spsc_queue</a></p></td> </tr></tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&</span> <a name="idm45506979615200-bb"></a><span class="identifier">front</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <p>get reference to element in the front of the queue</p> <p>Availability of front element can be checked using read_available().</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only a consuming thread is allowed to check front element </p></td> </tr> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>read_available() > 0. If ringbuffer is empty, it's undefined behaviour to invoke this method. </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>reference to the first element in the queue</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="identifier">T</span> <span class="special">&</span> <a name="idm45507163074288-bb"></a><span class="identifier">front</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre> <p>get reference to element in the front of the queue</p> <p>Availability of front element can be checked using read_available().</p> <p> </p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Thread-safe and wait-free </p></td></tr> </table></div> <p> </p> <div class="variablelist"><table border="0" class="variablelist compact"> <colgroup> <col align="left" valign="top"> <col> </colgroup> <tbody> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>only a consuming thread is allowed to check front element </p></td> </tr> <tr> <td><p><span class="term">Requires:</span></p></td> <td><p>read_available() > 0. If ringbuffer is empty, it's undefined behaviour to invoke this method. </p></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>reference to the first element in the queue</p></td> </tr> </tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">void</span> <a name="idm45507037474672-bb"></a><span class="identifier">reset</span><span class="special">(</span><span class="keyword">void</span><span class="special">)</span><span class="special">;</span></pre> <p>reset the ringbuffer</p> <div class="note"><table border="0" summary="Note"> <tr> <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td> <th align="left">Note</th> </tr> <tr><td align="left" valign="top"><p>Not thread-safe </p></td></tr> </table></div> <p> </p> </li> </ol></div> </div> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2008-2011 Tim Blechmann<p> Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="queue.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../lockfree/reference.html#header.boost.lockfree.spsc_queue_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="stack.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>