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  25 <div class="refentry">
  26 <a name="boost.interprocess.interprocess_condition"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Class interprocess_condition</span></h2>
  29 <p>boost::interprocess::interprocess_condition</p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../interprocess/indexes_reference.html#header.boost.interprocess.sync.interprocess_condition_hpp" title="Header &lt;boost/interprocess/sync/interprocess_condition.hpp&gt;">boost/interprocess/sync/interprocess_condition.hpp</a>&gt;
  33
  34 </span>
  35 <span class="keyword">class</span> <a class="link" href="interprocess_condition.html" title="Class interprocess_condition">interprocess_condition</a> <span class="special">{</span>
  36 <span class="keyword">public</span><span class="special">:</span>
  37   <span class="comment">// <a class="link" href="interprocess_condition.html#boost.interprocess.interprocess_conditionconstruct-copy-destruct">construct/copy/destruct</a></span>
  38   <a class="link" href="interprocess_condition.html#idp66586208-bb"><span class="identifier">interprocess_condition</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  39   <a class="link" href="interprocess_condition.html#idp66588288-bb"><span class="special">~</span><span class="identifier">interprocess_condition</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  40
  41   <span class="comment">// <a class="link" href="interprocess_condition.html#idp66565632-bb">public member functions</a></span>
  42   <span class="keyword">void</span> <a class="link" href="interprocess_condition.html#idp66566192-bb"><span class="identifier">notify_one</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  43   <span class="keyword">void</span> <a class="link" href="interprocess_condition.html#idp66567552-bb"><span class="identifier">notify_all</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  44   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> L<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="interprocess_condition.html#idp66568928-bb"><span class="identifier">wait</span></a><span class="special">(</span><span class="identifier">L</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  45   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> L<span class="special">,</span> <span class="keyword">typename</span> Pr<span class="special">&gt;</span> <span class="keyword">void</span> <a class="link" href="interprocess_condition.html#idp66572640-bb"><span class="identifier">wait</span></a><span class="special">(</span><span class="identifier">L</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">Pr</span><span class="special">)</span><span class="special">;</span>
  46   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> L<span class="special">&gt;</span> <span class="keyword">bool</span> <a class="link" href="interprocess_condition.html#idp66576720-bb"><span class="identifier">timed_wait</span></a><span class="special">(</span><span class="identifier">L</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">ptime</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  47   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> L<span class="special">,</span> <span class="keyword">typename</span> Pr<span class="special">&gt;</span>
  48     <span class="keyword">bool</span> <a class="link" href="interprocess_condition.html#idp66581216-bb"><span class="identifier">timed_wait</span></a><span class="special">(</span><span class="identifier">L</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">ptime</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">Pr</span><span class="special">)</span><span class="special">;</span>
  49 <span class="special">}</span><span class="special">;</span></pre></div>
  50 <div class="refsect1">
  51 <a name="idp248333968"></a><h2>Description</h2>
  52 <p>This class is a condition variable that can be placed in shared memory or memory mapped files. Destroys the object of type std::condition_variable_any</p>
  53 <p>Unlike std::condition_variable in C++11, it is NOT safe to invoke the destructor if all threads have been only notified. It is required that they have exited their respective wait functions. </p>
  54 <div class="refsect2">
  55 <a name="idp248335264"></a><h3>
  56 <a name="boost.interprocess.interprocess_conditionconstruct-copy-destruct"></a><code class="computeroutput">interprocess_condition</code>
  57         public
  58        construct/copy/destruct</h3>
  59 <div class="orderedlist"><ol class="orderedlist" type="1">
  60 <li class="listitem">
  61 <pre class="literallayout"><a name="idp66586208-bb"></a><span class="identifier">interprocess_condition</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Constructs a <code class="computeroutput"><a class="link" href="interprocess_condition.html" title="Class interprocess_condition">interprocess_condition</a></code>. On error throws <code class="computeroutput"><a class="link" href="interprocess_exception.html" title="Class interprocess_exception">interprocess_exception</a></code>. </li>
  62 <li class="listitem">
  63 <pre class="literallayout"><a name="idp66588288-bb"></a><span class="special">~</span><span class="identifier">interprocess_condition</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  64 <p>Destroys *this liberating system resources. </p>
  65 </li>
  66 </ol></div>
  67 </div>
  68 <div class="refsect2">
  69 <a name="idp248348384"></a><h3>
  70 <a name="idp66565632-bb"></a><code class="computeroutput">interprocess_condition</code> public member functions</h3>
  71 <div class="orderedlist"><ol class="orderedlist" type="1">
  72 <li class="listitem">
  73 <pre class="literallayout"><span class="keyword">void</span> <a name="idp66566192-bb"></a><span class="identifier">notify_one</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  74 <p>If there is a thread waiting on *this, change that thread's state to ready. Otherwise there is no effect. </p>
  75 </li>
  76 <li class="listitem">
  77 <pre class="literallayout"><span class="keyword">void</span> <a name="idp66567552-bb"></a><span class="identifier">notify_all</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  78 <p>Change the state of all threads waiting on *this to ready. If there are no waiting threads, notify_all() has no effect. </p>
  79 </li>
  80 <li class="listitem">
  81 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> L<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp66568928-bb"></a><span class="identifier">wait</span><span class="special">(</span><span class="identifier">L</span> <span class="special">&amp;</span> lock<span class="special">)</span><span class="special">;</span></pre>
  82 <p>Releases the lock on the <code class="computeroutput"><a class="link" href="interprocess_mutex.html" title="Class interprocess_mutex">interprocess_mutex</a></code> object associated with lock, blocks the current thread of execution until readied by a call to this-&gt;notify_one() or this-&gt;notify_all(), and then reacquires the lock. </p>
  83 </li>
  84 <li class="listitem">
  85 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> L<span class="special">,</span> <span class="keyword">typename</span> Pr<span class="special">&gt;</span> <span class="keyword">void</span> <a name="idp66572640-bb"></a><span class="identifier">wait</span><span class="special">(</span><span class="identifier">L</span> <span class="special">&amp;</span> lock<span class="special">,</span> <span class="identifier">Pr</span> pred<span class="special">)</span><span class="special">;</span></pre>
  86 <p>The same as: while (!pred()) wait(lock) </p>
  87 </li>
  88 <li class="listitem">
  89 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> L<span class="special">&gt;</span>
  90   <span class="keyword">bool</span> <a name="idp66576720-bb"></a><span class="identifier">timed_wait</span><span class="special">(</span><span class="identifier">L</span> <span class="special">&amp;</span> lock<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">ptime</span> <span class="special">&amp;</span> abs_time<span class="special">)</span><span class="special">;</span></pre>
  91 <p>Releases the lock on the <code class="computeroutput"><a class="link" href="interprocess_mutex.html" title="Class interprocess_mutex">interprocess_mutex</a></code> object associated with lock, blocks the current thread of execution until readied by a call to this-&gt;notify_one() or this-&gt;notify_all(), or until time abs_time is reached, and then reacquires the lock. Returns: false if time abs_time is reached, otherwise true. </p>
  92 </li>
  93 <li class="listitem">
  94 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> L<span class="special">,</span> <span class="keyword">typename</span> Pr<span class="special">&gt;</span>
  95   <span class="keyword">bool</span> <a name="idp66581216-bb"></a><span class="identifier">timed_wait</span><span class="special">(</span><span class="identifier">L</span> <span class="special">&amp;</span> lock<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">ptime</span> <span class="special">&amp;</span> abs_time<span class="special">,</span>
  96                   <span class="identifier">Pr</span> pred<span class="special">)</span><span class="special">;</span></pre>
  97 <p>The same as: while (!pred()) { if (!timed_wait(lock, abs_time)) return pred(); } return true; </p>
  98 </li>
  99 </ol></div>
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