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</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="../unique_lock.html" title="cpp/thread/unique lock"><tt>std::unique_lock</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="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.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="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="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="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><strong class="selflink"><span class="t-lines"><span>unique_lock::try_lock_for</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="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="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="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="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="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="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="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="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-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> Rep, <span class="kw1">class</span> Period <span class="sy1">></span><br />
<span class="kw4">bool</span> try_lock_for<span class="br0">(</span> <span class="kw4">const</span> <a href="../../chrono/duration.html"><span class="kw871">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span></span></a><span class="sy1"><</span>Rep,Period<span class="sy1">></span><span class="sy3">&</span> timeout_duration <span class="br0">)</span><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>Tries to lock the associated mutex. Blocks until specified <code>timeout_duration</code> has elapsed or the lock is acquired, whichever comes first. On successful lock acquisition returns <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span>, otherwise returns <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span>. Effectively calls <span class="t-c"><span class="mw-geshi cpp source-cpp">mutex<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">></span>try_lock_for<span class="br0">(</span>timeout_duration<span class="br0">)</span></span></span>.
</p><p>A steady clock is used to measure the duration. This function may block for longer than <code>timeout_duration</code> due to scheduling or resource contention delays.
</p><p><span class="t-lc"><a href="../../error/system_error.html" title="cpp/error/system error">std::system_error</a></span> is thrown if there is no associated mutex or if the mutex is already locked.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="try_lock_for.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="try_lock_for.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="try_lock_for.html#Exceptions"><span class="tocnumber">3</span> <span class="toctext">Exceptions</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="try_lock_for.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="try_lock_for.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=cpp/thread/unique_lock/try_lock_for&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> timeout_duration
</td>
<td> -
</td>
<td> maximum duration to block for
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock/try_lock_for&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> if the ownership of the mutex has been acquired successfully, <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> otherwise.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock/try_lock_for&action=edit&section=3" title="Edit section: Exceptions">edit</a>]</span> <span class="mw-headline" id="Exceptions">Exceptions</span></h3>
<ul><li> Any exceptions thrown by <span class="t-c"><span class="mw-geshi cpp source-cpp">mutex<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">></span>try_lock_for<span class="br0">(</span>timeout_duration<span class="br0">)</span></span></span>
</li></ul>
<ul><li> If there is no associated mutex, <span class="t-lc"><a href="../../error/system_error.html" title="cpp/error/system error">std::system_error</a></span> with an error code of <span class="t-lc"><a href="../../error/errc.html" title="cpp/error/errc">std::errc::operation_not_permitted</a></span>
</li></ul>
<ul><li> If the mutex is already locked, <span class="t-lc"><a href="../../error/system_error.html" title="cpp/error/system error">std::system_error</a></span> with an error code of <span class="t-lc"><a href="../../error/errc.html" title="cpp/error/errc">std::errc::resource_deadlock_would_occur</a></span>
</li></ul>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock/try_lock_for&action=edit&section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style=""><tr><td class="mbox-empty-cell"></td><td class="mbox-text" style="">This section is incomplete<br />Reason: no example </td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/thread/unique_lock/try_lock_for&action=edit&section=5" 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.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="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="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="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>
</table>
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