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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../recursive_mutex.html" title="cpp/thread/recursive mutex"><span class="t-lines"><span>recursive_mutex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../shared_mutex.html" title="cpp/thread/shared mutex"><span class="t-lines"><span>shared_mutex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../timed_mutex.html" title="cpp/thread/timed mutex"><span class="t-lines"><span>timed_mutex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../recursive_timed_mutex.html" title="cpp/thread/recursive timed mutex"><span class="t-lines"><span>recursive_timed_mutex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../shared_timed_mutex.html" title="cpp/thread/shared timed mutex"><span class="t-lines"><span>shared_timed_mutex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Generic lock management</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../lock_guard.html" title="cpp/thread/lock guard"><span class="t-lines"><span>lock_guard</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../unique_lock.html" title="cpp/thread/unique lock"><span class="t-lines"><span>unique_lock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../shared_lock.html" title="cpp/thread/shared lock"><span class="t-lines"><span>shared_lock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../lock_tag_t.html" title="cpp/thread/lock tag t"><span class="t-lines"><span>defer_lock_t</span><span>try_to_lock_t</span><span>adopt_lock_t</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../lock.html" title="cpp/thread/lock"><span class="t-lines"><span>lock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../try_lock.html" title="cpp/thread/try lock"><span class="t-lines"><span>try_lock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../lock_tag.html" title="cpp/thread/lock tag"><span class="t-lines"><span>defer_lock</span><span>try_to_lock</span><span>adopt_lock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../once_flag.html" title="cpp/thread/once flag"><span class="t-lines"><span>once_flag</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../call_once.html" title="cpp/thread/call once"><span class="t-lines"><span>call_once</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Condition variables</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../condition_variable.html" title="cpp/thread/condition variable"><span class="t-lines"><span>condition_variable</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../condition_variable_any.html" title="cpp/thread/condition variable any"><span class="t-lines"><span>condition_variable_any</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../notify_all_at_thread_exit.html" title="cpp/thread/notify all at thread exit"><span class="t-lines"><span>notify_all_at_thread_exit</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../cv_status.html" title="cpp/thread/cv status"><span class="t-lines"><span>cv_status</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Futures</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../promise.html" title="cpp/thread/promise"><span class="t-lines"><span>promise</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../future.html" title="cpp/thread/future"><span class="t-lines"><span>future</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../shared_future.html" title="cpp/thread/shared future"><span class="t-lines"><span>shared_future</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../packaged_task.html" title="cpp/thread/packaged task"><span class="t-lines"><span>packaged_task</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../async.html" title="cpp/thread/async"><span class="t-lines"><span>async</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../launch.html" title="cpp/thread/launch"><span class="t-lines"><span>launch</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../future_status.html" title="cpp/thread/future status"><span class="t-lines"><span>future_status</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../future_error.html" title="cpp/thread/future error"><span class="t-lines"><span>future_error</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../future_category.html" title="cpp/thread/future category"><span class="t-lines"><span>future_category</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../future_errc.html" title="cpp/thread/future errc"><span class="t-lines"><span>future_errc</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../condition_variable_any.html" title="cpp/thread/condition variable any"><tt>std::condition_variable_any</tt></a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> Member functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable_any.html" title="cpp/thread/condition variable any/condition variable any"><span class="t-lines"><span>condition_variable_any::condition_variable_any</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="~condition_variable_any.html" title="cpp/thread/condition variable any/~condition variable any"><span class="t-lines"><span>condition_variable_any::~condition_variable_any</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Notification</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="notify_one.html" title="cpp/thread/condition variable any/notify one"><span class="t-lines"><span>condition_variable_any::notify_one</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="notify_all.html" title="cpp/thread/condition variable any/notify all"><span class="t-lines"><span>condition_variable_any::notify_all</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Waiting</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>condition_variable_any::wait</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="wait_for.html" title="cpp/thread/condition variable any/wait for"><span class="t-lines"><span>condition_variable_any::wait_for</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="wait_until.html" title="cpp/thread/condition variable any/wait until"><span class="t-lines"><span>condition_variable_any::wait_until</span></span></a></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable_any/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Lock <span class="sy1">></span><br />
<span class="kw4">void</span> wait<span class="br0">(</span> Lock<span class="sy3">&</span> lock <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Lock, <span class="kw1">class</span> Predicate <span class="sy1">></span><br />
<span class="kw4">void</span> wait<span class="br0">(</span> Lock<span class="sy3">&</span> lock, Predicate pred <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p><code>wait</code> causes the current thread to block until the condition variable is notified or a spurious wakeup occurs, optionally looping until some predicate is satisfied.
</p>
<div class="t-li1"><span class="t-li">1)</span> Atomically releases <code>lock</code>, blocks the current executing thread, and adds it to the list of threads waiting on <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span>. The thread will be unblocked when <span class="t-lc"><a href="notify_all.html" title="cpp/thread/condition variable any/notify all">notify_all()</a></span> or <span class="t-lc"><a href="notify_one.html" title="cpp/thread/condition variable any/notify one">notify_one()</a></span> is executed. It may also be unblocked spuriously. When unblocked, regardless of the reason, <code>lock</code> is reacquired and <code>wait</code> exits. <span class="t-rev-inl t-until-cxx14"><span>If this function exits via exception, <code>lock</code> is also reacquired.</span> <span><span class="t-mark-rev t-until-cxx14">(until C++14)</span></span></span></div>
<div class="t-li1"><span class="t-li">2)</span> Equivalent to
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="kw1">while</span> <span class="br0">(</span><span class="sy3">!</span>pred<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
wait<span class="br0">(</span>lock<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
This overload may be used to ignore spurious awakenings while waiting for a specific condition to become true. Note that before enter to this method <code>lock</code> must be acquired, after <code>wait(lock)</code> exits it is also reacquired, i.e. <code>lock</code> can be used as a guard to <code>pred()</code> access.</div>
<table class="t-rev-begin">
<tr class="t-rev t-since-cxx14"><td>If these functions fail to meet the postconditions
(<span class="t-c"><span class="mw-geshi cpp source-cpp">lock</span></span> is locked by the calling thread), <span class="t-lc"><a href="../../error/terminate.html" title="cpp/error/terminate">std::terminate</a></span> is called. For example, this could happen if relocking the mutex throws an exception,</td>
<td><span class="t-mark-rev t-since-cxx14">(since C++14)</span></td></tr>
</table>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1"><a href="wait.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1"><a href="wait.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1"><a href="wait.html#Exceptions"><span class="tocnumber">3</span> <span class="toctext">Exceptions</span></a></li>
<li class="toclevel-1"><a href="wait.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1"><a href="wait.html#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable/wait&action=edit&section=T-1" title="Template:cpp/thread/condition variable/wait">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> lock
</td>
<td> -
</td>
<td> an object of type <code>Lock</code> that meets the <a href="../../concept/BasicLockable.html" title="cpp/concept/BasicLockable"><code>BasicLockable</code></a> requirements, which must be locked by the current thread
</td></tr>
<tr class="t-par">
<td> pred
</td>
<td> -
</td>
<td> predicate which returns <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> if the waiting should be continued. <br />
<p>The signature of the predicate function should be equivalent to the following:
</p><p><span class="t-cc"><span class="mw-geshi cpp source-cpp"> <span class="kw4">bool</span> pred<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></span>
</p>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable/wait&action=edit&section=T-2" title="Template:cpp/thread/condition variable/wait">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p>(none)
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable/wait&action=edit&section=T-3" title="Template:cpp/thread/condition variable/wait">edit</a>]</span> <span class="mw-headline" id="Exceptions">Exceptions</span></h3>
<table class="t-rev-begin">
<tr class="t-rev t-until-cxx14"><td>
<p>May throw <span class="t-lc"><a href="../../error/system_error.html" title="cpp/error/system error">std::system_error</a></span>, may also propagate exceptions thrown by <a href="../unique_lock/lock.html" title="cpp/thread/unique lock/lock"><span class="t-c"><span class="mw-geshi cpp source-cpp">lock.<span class="me1">lock</span><span class="br0">(</span><span class="br0">)</span></span></span></a> or <a href="../unique_lock/unlock.html" title="cpp/thread/unique lock/unlock"><span class="t-c"><span class="mw-geshi cpp source-cpp">lock.<span class="me1">unlock</span><span class="br0">(</span><span class="br0">)</span></span></span></a>.
</p>
</td>
<td><span class="t-mark-rev t-until-cxx14">(until C++14)</span></td></tr>
<tr class="t-rev t-since-cxx14"><td>
<p>Does not throw
</p>
</td>
<td><span class="t-mark-rev t-since-cxx14">(since C++14)</span></td></tr>
</table>
<p><br />
</p><p><br />
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable/wait&action=edit&section=T-5" title="Template:cpp/thread/condition variable/wait">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-template-editlink" style="">
<span class="t-template editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable/example1&action=edit">[edit]</a></span></div><div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <iostream></span>
<span class="co2">#include <condition_variable></span>
<span class="co2">#include <thread></span>
<span class="co2">#include <chrono></span>
 
<a href="../condition_variable_any.html"><span class="kw1850">std::<span class="me2">condition_variable_any</span></span></a> cv<span class="sy4">;</span>
<a href="../mutex.html"><span class="kw1832">std::<span class="me2">mutex</span></span></a> cv_m<span class="sy4">;</span> <span class="co1">// This mutex is used for three purposes:</span>
<span class="co1">// 1) to synchronize accesses to i</span>
<span class="co1">// 2) to synchronize accesses to std::cerr</span>
<span class="co1">// 3) for the condition variable cv</span>
<span class="kw4">int</span> i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
 
<span class="kw4">void</span> waits<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="../unique_lock.html"><span class="kw1845">std::<span class="me2">unique_lock</span></span></a><span class="sy1"><</span><a href="../mutex.html"><span class="kw1832">std::<span class="me2">mutex</span></span></a><span class="sy1">></span> lk<span class="br0">(</span>cv_m<span class="br0">)</span><span class="sy4">;</span>
<a href="../../io/cerr.html"><span class="kw1483">std::<span class="me2">cerr</span></span></a> <span class="sy1"><<</span> <span class="st0">"Waiting... <span class="es1">\n</span>"</span><span class="sy4">;</span>
cv.<span class="me1">wait</span><span class="br0">(</span>lk, <span class="br0">[</span><span class="br0">]</span><span class="br0">{</span><span class="kw1">return</span> i <span class="sy1">==</span> <span class="nu0">1</span><span class="sy4">;</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../../io/cerr.html"><span class="kw1483">std::<span class="me2">cerr</span></span></a> <span class="sy1"><<</span> <span class="st0">"...finished waiting. i == 1<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">void</span> signals<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="../sleep_for.html"><span class="kw1829">std::<span class="me2">this_thread</span><span class="sy4">::</span><span class="me2">sleep_for</span></span></a><span class="br0">(</span><a href="../../chrono/duration.html"><span class="kw875">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">{</span>
<a href="../lock_guard.html"><span class="kw1844">std::<span class="me2">lock_guard</span></span></a><span class="sy1"><</span><a href="../mutex.html"><span class="kw1832">std::<span class="me2">mutex</span></span></a><span class="sy1">></span> lk<span class="br0">(</span>cv_m<span class="br0">)</span><span class="sy4">;</span>
<a href="../../io/cerr.html"><span class="kw1483">std::<span class="me2">cerr</span></span></a> <span class="sy1"><<</span> <span class="st0">"Notifying...<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="br0">}</span>
cv.<span class="me1">notify_all</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
 
<a href="../sleep_for.html"><span class="kw1829">std::<span class="me2">this_thread</span><span class="sy4">::</span><span class="me2">sleep_for</span></span></a><span class="br0">(</span><a href="../../chrono/duration.html"><span class="kw875">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
 
<span class="br0">{</span>
<a href="../lock_guard.html"><span class="kw1844">std::<span class="me2">lock_guard</span></span></a><span class="sy1"><</span><a href="../mutex.html"><span class="kw1832">std::<span class="me2">mutex</span></span></a><span class="sy1">></span> lk<span class="br0">(</span>cv_m<span class="br0">)</span><span class="sy4">;</span>
i <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span>
<a href="../../io/cerr.html"><span class="kw1483">std::<span class="me2">cerr</span></span></a> <span class="sy1"><<</span> <span class="st0">"Notifying again...<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="br0">}</span>
cv.<span class="me1">notify_all</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="../thread.html"><span class="kw1826">std::<span class="me2">thread</span></span></a> t1<span class="br0">(</span>waits<span class="br0">)</span>, t2<span class="br0">(</span>waits<span class="br0">)</span>, t3<span class="br0">(</span>waits<span class="br0">)</span>, t4<span class="br0">(</span>signals<span class="br0">)</span><span class="sy4">;</span>
t1.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
t2.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
t3.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
t4.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Possible output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Waiting...
Waiting...
Waiting...
Notifying...
Notifying again...
...finished waiting. i == 1
...finished waiting. i == 1
...finished waiting. i == 1</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable/wait&action=edit&section=T-6" title="Template:cpp/thread/condition variable/wait">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="wait_for.html" title="cpp/thread/condition variable any/wait for"> <span class="t-lines"><span>wait_for</span></span></a></div></div>
</td>
<td> blocks the current thread until the condition variable is woken up or after the specified timeout duration <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable/dsc_wait_for&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="wait_until.html" title="cpp/thread/condition variable any/wait until"> <span class="t-lines"><span>wait_until</span></span></a></div></div>
</td>
<td> blocks the current thread until the condition variable is woken up or until specified time point has been reached <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/thread/condition_variable/dsc_wait_until&action=edit">[edit]</a></span>
</td></tr>
</table>
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