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<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><strong class="selflink"><span class="t-lines"><span>unique_lock</span></span></strong></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"><strong class="selflink"><tt>std::unique_lock</tt></strong><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="unique_lock/unique_lock.html" title="cpp/thread/unique lock/unique lock"><span class="t-lines"><span>unique_lock::unique_lock</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/~unique_lock.html" title="cpp/thread/unique lock/~unique lock"><span class="t-lines"><span>unique_lock::~unique_lock</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/operator=.html" title="cpp/thread/unique lock/operator="><span class="t-lines"><span>unique_lock::operator=</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Locking</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/lock.html" title="cpp/thread/unique lock/lock"><span class="t-lines"><span>unique_lock::lock</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/try_lock.html" title="cpp/thread/unique lock/try lock"><span class="t-lines"><span>unique_lock::try_lock</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/try_lock_for.html" title="cpp/thread/unique lock/try lock for"><span class="t-lines"><span>unique_lock::try_lock_for</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/try_lock_until.html" title="cpp/thread/unique lock/try lock until"><span class="t-lines"><span>unique_lock::try_lock_until</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/unlock.html" title="cpp/thread/unique lock/unlock"><span class="t-lines"><span>unique_lock::unlock</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Modifiers</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/swap.html" title="cpp/thread/unique lock/swap"><span class="t-lines"><span>unique_lock::swap</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/release.html" title="cpp/thread/unique lock/release"><span class="t-lines"><span>unique_lock::release</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Observers</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/mutex.html" title="cpp/thread/unique lock/mutex"><span class="t-lines"><span>unique_lock::mutex</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/owns_lock.html" title="cpp/thread/unique lock/owns lock"><span class="t-lines"><span>unique_lock::owns_lock</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/operator_bool.html" title="cpp/thread/unique lock/operator bool"><span class="t-lines"><span>unique_lock::operator bool</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Non-member functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unique_lock/swap2.html" title="cpp/thread/unique lock/swap2"><span class="t-lines"><span>std::swap</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/unique_lock/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-dsc-header">
<td> <div>Defined in header <code><a href="../header/mutex.html" title="cpp/header/mutex"><mutex></a></code>
</div></td>
<td></td>
<td></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> Mutex <span class="sy1">></span><br />
<span class="kw1">class</span> unique_lock<span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </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>The class <span class="t-c"><span class="mw-geshi cpp source-cpp">unique_lock</span></span> is a general-purpose mutex ownership wrapper allowing deferred locking, time-constrained attempts at locking, recursive locking, transfer of lock ownership, and use with condition variables.
</p><p>The class <span class="t-c"><span class="mw-geshi cpp source-cpp">unique_lock</span></span> is movable, but not copyable -- it meets the requirements of <a href="../concept/MoveConstructible.html" title="cpp/concept/MoveConstructible"><code>MoveConstructible</code></a> and <a href="../concept/MoveAssignable.html" title="cpp/concept/MoveAssignable"><code>MoveAssignable</code></a> but not of <a href="../concept/CopyConstructible.html" title="cpp/concept/CopyConstructible"><code>CopyConstructible</code></a> or <a href="../concept/CopyAssignable.html" title="cpp/concept/CopyAssignable"><code>CopyAssignable</code></a>.
</p><p>The class <span class="t-c"><span class="mw-geshi cpp source-cpp">unique_lock</span></span> meets the <a href="../concept/BasicLockable.html" title="cpp/concept/BasicLockable"><code>BasicLockable</code></a> requirements. If <b>Mutex</b> meets the <a href="../concept/Lockable.html" title="cpp/concept/Lockable"><code>Lockable</code></a> requirements, <span class="t-c"><span class="mw-geshi cpp source-cpp">unique_lock</span></span> also meets the <a href="../concept/Lockable.html" title="cpp/concept/Lockable"><code>Lockable</code></a> requirements (ex.: can be used in <span class="t-lc">std::lock</span>); if <b>Mutex</b> meets the <a href="../concept/TimedLockable.html" title="cpp/concept/TimedLockable"><code>TimedLockable</code></a> requirements, <span class="t-c"><span class="mw-geshi cpp source-cpp">unique_lock</span></span> also meets the <a href="../concept/TimedLockable.html" title="cpp/concept/TimedLockable"><code>TimedLockable</code></a> requirements.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="unique_lock.html#Template_parameters"><span class="tocnumber">1</span> <span class="toctext">Template parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="unique_lock.html#Member_types"><span class="tocnumber">2</span> <span class="toctext">Member types</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="unique_lock.html#Member_functions"><span class="tocnumber">3</span> <span class="toctext">Member functions</span></a>
<ul>
<li class="toclevel-2"><a href="unique_lock.html#Locking"><span class="tocnumber">3.1</span> <span class="toctext">Locking</span></a></li>
<li class="toclevel-2"><a href="unique_lock.html#Modifiers"><span class="tocnumber">3.2</span> <span class="toctext">Modifiers</span></a></li>
<li class="toclevel-2"><a href="unique_lock.html#Observers"><span class="tocnumber">3.3</span> <span class="toctext">Observers</span></a></li>
</ul>
</li>
<li class="toclevel-1 tocsection-4"><a href="unique_lock.html#Non-member_functions"><span class="tocnumber">4</span> <span class="toctext">Non-member functions</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="unique_lock.html#Example"><span class="tocnumber">5</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="unique_lock.html#See_also"><span class="tocnumber">6</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=cpp/thread/unique_lock&action=edit&section=1" title="Edit section: Template parameters">edit</a>]</span> <span class="mw-headline" id="Template_parameters">Template parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> Mutex
</td>
<td> -
</td>
<td> the type of the mutex to lock. The type must meet the <a href="../concept/BasicLockable.html" title="cpp/concept/BasicLockable"><code>BasicLockable</code></a> requirements
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock&action=edit&section=2" title="Edit section: Member types">edit</a>]</span> <span class="mw-headline" id="Member_types">Member types</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td> Type
</td>
<td> Definition
</td></tr>
<tr class="t-dsc">
<td> <code>mutex_type</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">Mutex</span></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock&action=edit&section=3" title="Edit section: Member functions">edit</a>]</span> <span class="mw-headline" id="Member_functions">Member functions</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="unique_lock/unique_lock.html" title="cpp/thread/unique lock/unique lock"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
</td>
<td> constructs a <code>unique_lock</code>, optionally locking the supplied mutex <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/unique_lock/dsc_constructor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="unique_lock/~unique_lock.html" title="cpp/thread/unique lock/~unique lock"> <span class="t-lines"><span>(destructor)</span></span></a></div></div>
</td>
<td> unlocks the associated mutex, if owned <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/unique_lock/dsc_destructor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/operator=.html" title="cpp/thread/unique lock/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
</td>
<td> unlocks the mutex, if owned, and acquires ownership of another <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/unique_lock/dsc_operator%3D&action=edit">[edit]</a></span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Locking"> Locking </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/lock.html" title="cpp/thread/unique lock/lock"> <span class="t-lines"><span>lock</span></span></a></div></div>
</td>
<td> locks the associated mutex <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/unique_lock/dsc_lock&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/try_lock.html" title="cpp/thread/unique lock/try lock"> <span class="t-lines"><span>try_lock</span></span></a></div></div>
</td>
<td> tries to lock the associated mutex, returns if the mutex is not available <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/unique_lock/dsc_try_lock&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/try_lock_for.html" title="cpp/thread/unique lock/try lock for"> <span class="t-lines"><span>try_lock_for</span></span></a></div></div>
</td>
<td> attempts to lock the associated <a href="../concept/TimedLockable.html" title="cpp/concept/TimedLockable"><code>TimedLockable</code></a> mutex, returns if the mutex has been unavailable for the specified time 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/unique_lock/dsc_try_lock_for&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/try_lock_until.html" title="cpp/thread/unique lock/try lock until"> <span class="t-lines"><span>try_lock_until</span></span></a></div></div>
</td>
<td> tries to lock the associated <a href="../concept/TimedLockable.html" title="cpp/concept/TimedLockable"><code>TimedLockable</code></a> mutex, returns if the mutex has been unavailable 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/unique_lock/dsc_try_lock_until&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/unlock.html" title="cpp/thread/unique lock/unlock"> <span class="t-lines"><span>unlock</span></span></a></div></div>
</td>
<td> unlocks the associated mutex <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/unique_lock/dsc_unlock&action=edit">[edit]</a></span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Modifiers"> Modifiers </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/swap.html" title="cpp/thread/unique lock/swap"> <span class="t-lines"><span>swap</span></span></a></div></div>
</td>
<td> swaps state with another <span class="t-lc">std::unique_lock</span> <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/unique_lock/dsc_swap&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/release.html" title="cpp/thread/unique lock/release"> <span class="t-lines"><span>release</span></span></a></div></div>
</td>
<td> disassociates the associated mutex without unlocking it <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/unique_lock/dsc_release&action=edit">[edit]</a></span>
</td></tr>
<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Observers"> Observers </span></h5>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/mutex.html" title="cpp/thread/unique lock/mutex"> <span class="t-lines"><span>mutex</span></span></a></div></div>
</td>
<td> returns a pointer to the associated mutex <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/unique_lock/dsc_mutex&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/owns_lock.html" title="cpp/thread/unique lock/owns lock"> <span class="t-lines"><span>owns_lock</span></span></a></div></div>
</td>
<td> tests whether the lock owns its associated mutex <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/unique_lock/dsc_owns_lock&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/operator_bool.html" title="cpp/thread/unique lock/operator bool"> <span class="t-lines"><span>operator bool</span></span></a></div></div>
</td>
<td> tests whether the lock owns its associated mutex <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/unique_lock/dsc_operator_bool&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock&action=edit&section=4" title="Edit section: Non-member functions">edit</a>]</span> <span class="mw-headline" id="Non-member_functions">Non-member functions</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="unique_lock/swap2.html" title="cpp/thread/unique lock/swap2"> <span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::unique_lock)</span></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>
<td> specialization of <span class="t-lc">std::swap</span> for <code>unique_lock</code> <br /> <span class="t-mark">(function template)</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/unique_lock/dsc_swap2&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock&action=edit&section=5" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<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 <mutex></span>
<span class="co2">#include <thread></span>
<span class="co2">#include <chrono></span>
 
<span class="kw1">struct</span> Box <span class="br0">{</span>
<span class="kw1">explicit</span> Box<span class="br0">(</span><span class="kw4">int</span> num<span class="br0">)</span> <span class="sy4">:</span> num_things<span class="br0">{</span>num<span class="br0">}</span> <span class="br0">{</span><span class="br0">}</span>
 
<span class="kw4">int</span> num_things<span class="sy4">;</span>
<a href="mutex.html"><span class="kw1832">std::<span class="me2">mutex</span></span></a> m<span class="sy4">;</span>
<span class="br0">}</span><span class="sy4">;</span>
 
<span class="kw4">void</span> transfer<span class="br0">(</span>Box <span class="sy3">&</span>from, Box <span class="sy3">&</span>to, <span class="kw4">int</span> num<span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// don't actually take the locks yet</span>
std<span class="sy4">::</span><span class="me2">unique_lock</span><span class="sy1"><</span><a href="mutex.html"><span class="kw1832">std::<span class="me2">mutex</span></span></a><span class="sy1">></span> lock1<span class="br0">(</span>from.<span class="me1">m</span>, <a href="lock_tag.html"><span class="kw1841">std::<span class="me2">defer_lock</span></span></a><span class="br0">)</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">unique_lock</span><span class="sy1"><</span><a href="mutex.html"><span class="kw1832">std::<span class="me2">mutex</span></span></a><span class="sy1">></span> lock2<span class="br0">(</span>to.<span class="me1">m</span>, <a href="lock_tag.html"><span class="kw1841">std::<span class="me2">defer_lock</span></span></a><span class="br0">)</span><span class="sy4">;</span>
 
<span class="co1">// lock both unique_locks without deadlock</span>
<a href="lock.html"><span class="kw1846">std::<span class="me2">lock</span></span></a><span class="br0">(</span>lock1, lock2<span class="br0">)</span><span class="sy4">;</span>
 
from.<span class="me1">num_things</span> <span class="sy2">-</span><span class="sy1">=</span> num<span class="sy4">;</span>
to.<span class="me1">num_things</span> <span class="sy2">+</span><span class="sy1">=</span> num<span class="sy4">;</span>
 
<span class="co1">// 'from.m' and 'to.m' mutexes unlocked in 'unique_lock' dtors</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
Box acc1<span class="br0">(</span><span class="nu0">100</span><span class="br0">)</span><span class="sy4">;</span>
Box acc2<span class="br0">(</span><span class="nu0">50</span><span class="br0">)</span><span class="sy4">;</span>
 
<a href="thread.html"><span class="kw1826">std::<span class="me2">thread</span></span></a> t1<span class="br0">(</span>transfer, <a href="../utility/functional/ref.html"><span class="kw934">std::<span class="me2">ref</span></span></a><span class="br0">(</span>acc1<span class="br0">)</span>, <a href="../utility/functional/ref.html"><span class="kw934">std::<span class="me2">ref</span></span></a><span class="br0">(</span>acc2<span class="br0">)</span>, <span class="nu0">10</span><span class="br0">)</span><span class="sy4">;</span>
<a href="thread.html"><span class="kw1826">std::<span class="me2">thread</span></span></a> t2<span class="br0">(</span>transfer, <a href="../utility/functional/ref.html"><span class="kw934">std::<span class="me2">ref</span></span></a><span class="br0">(</span>acc2<span class="br0">)</span>, <a href="../utility/functional/ref.html"><span class="kw934">std::<span class="me2">ref</span></span></a><span class="br0">(</span>acc1<span class="br0">)</span>, <span class="nu0">5</span><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>
<span class="br0">}</span></pre></div></div>
<p><br />
</p>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock&action=edit&section=6" title="Edit section: See also">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="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>
<td> implements a strictly scope-based mutex ownership wrapper <br /> <span class="t-mark">(class template)</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/dsc_lock_guard&action=edit">[edit]</a></span>
</td></tr>
</table>
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