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<title>Time Requirements</title>
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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="thread.time"></a><a class="link" href="time.html" title="Time Requirements">Time Requirements</a>
</h2></div></div></div>
<div class="toc"><dl class="toc"><dt><span class="section"><a href="time.html#thread.time.deprecated">Deprecated</a></span></dt></dl></div>
<p>
As of Boost 1.50.0, the <span class="bold"><strong>Boost.Thread</strong></span> library
uses Boost.Chrono library for all operations that require a time out as defined
in the standard c++11. These include (but are not limited to):
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">this_thread</span><span class="special">::</span><a class="link" href="thread_management.html#thread.thread_management.this_thread.sleep_for" title="Non-member function sleep_for()"><code class="computeroutput"><span class="identifier">sleep_for</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">this_thread</span><span class="special">::</span><a class="link" href="thread_management.html#thread.thread_management.this_thread.sleep_until" title="Non-member function sleep_until()"><code class="computeroutput"><span class="identifier">sleep_until</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><a class="link" href="thread_management.html#thread.thread_management.thread" title="Class thread"><code class="computeroutput"><span class="identifier">thread</span></code></a><span class="special">::</span><a class="link" href="thread_management.html#thread.thread_management.thread.try_join_for" title="Member function try_join_for() EXTENSION"><code class="computeroutput"><span class="identifier">try_join_for</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><a class="link" href="thread_management.html#thread.thread_management.thread" title="Class thread"><code class="computeroutput"><span class="identifier">thread</span></code></a><span class="special">::</span><a class="link" href="thread_management.html#thread.thread_management.thread.try_join_until" title="Member function try_join_until() EXTENSION"><code class="computeroutput"><span class="identifier">try_join_until</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable" title="Class condition_variable"><code class="computeroutput"><span class="identifier">condition_variable</span></code></a><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable.wait_for" title="template <class Rep, class Period> cv_status wait_for(boost::unique_lock<boost::mutex>& lock, const chrono::duration<Rep, Period>& rel_time)"><code class="computeroutput"><span class="identifier">wait_for</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable" title="Class condition_variable"><code class="computeroutput"><span class="identifier">condition_variable</span></code></a><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable.wait_until" title="template <class Clock, class Duration> cv_status wait_until(boost::unique_lock<boost::mutex>& lock, const chrono::time_point<Clock, Duration>& abs_time)"><code class="computeroutput"><span class="identifier">wait_until</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable_any" title="Class condition_variable_any"><code class="computeroutput"><span class="identifier">condition_variable_any</span></code></a><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable_any.wait_for" title="template <class lock_type, class Rep, class Period> cv_status wait_for(lock_type& lock, const chrono::duration<Rep, Period>& rel_time)"><code class="computeroutput"><span class="identifier">wait_for</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable_any" title="Class condition_variable_any"><code class="computeroutput"><span class="identifier">condition_variable_any</span></code></a><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable_any.wait_until" title="template <class lock_type, class Clock, class Duration> cv_status wait_until(lock_type& lock, const chrono::time_point<Clock, Duration>& abs_time)"><code class="computeroutput"><span class="identifier">wait_until</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.timed_lockable" title="TimedLockable Concept"><code class="computeroutput"><span class="identifier">TimedLockable</span></code></a><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.timed_lockable.try_lock_for" title="m.try_lock_for(rel_time)"><code class="computeroutput"><span class="identifier">try_lock_for</span></code></a></code>
</li>
<li class="listitem">
<code class="computeroutput"><a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.timed_lockable" title="TimedLockable Concept"><code class="computeroutput"><span class="identifier">TimedLockable</span></code></a><span class="special">::</span><a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.timed_lockable.try_lock_until" title="m.try_lock_until(abs_time)"><code class="computeroutput"><span class="identifier">try_lock_until</span></code></a></code>
</li>
</ul></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="thread.time.deprecated"></a><a class="link" href="time.html#thread.time.deprecated" title="Deprecated">Deprecated</a>
</h3></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="time.html#thread.time.deprecated.system_time">Typedef <code class="computeroutput"><span class="identifier">system_time</span></code></a></span></dt>
<dt><span class="section"><a href="time.html#thread.time.deprecated.get_system_time">Non-member
function <code class="computeroutput"><span class="identifier">get_system_time</span><span class="special">()</span></code></a></span></dt>
</dl></div>
<p>
The time related functions introduced in Boost 1.35.0, using the <a class="link" href="../date_time.html" title="Chapter 9. Boost.Date_Time">Boost.Date_Time</a>
library are deprecated. These include (but are not limited to):
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<a class="link" href="thread_management.html#thread.thread_management.this_thread.sleep" title="Non-member function sleep() DEPRECATED"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">this_thread</span><span class="special">::</span><span class="identifier">sleep</span><span class="special">()</span></code></a>
</li>
<li class="listitem">
<a class="link" href="thread_management.html#thread.thread_management.thread.timed_join" title="Member function timed_join() DEPRECATED"><code class="computeroutput"><span class="identifier">timed_join</span><span class="special">()</span></code></a>
</li>
<li class="listitem">
<a class="link" href="synchronization.html#thread.synchronization.condvar_ref.condition_variable.timed_wait" title="bool timed_wait(boost::unique_lock<boost::mutex>& lock,boost::system_time const& abs_time)"><code class="computeroutput"><span class="identifier">timed_wait</span><span class="special">()</span></code></a>
</li>
<li class="listitem">
<a class="link" href="synchronization.html#thread.synchronization.mutex_concepts.timed_lockable.timed_lock" title="m.timed_lock(abs_time)"><code class="computeroutput"><span class="identifier">timed_lock</span><span class="special">()</span></code></a>
</li>
</ul></div>
<p>
For the overloads that accept an absolute time parameter, an object of type
<a class="link" href="time.html#thread.time.deprecated.system_time" title="Typedef system_time"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">system_time</span></code></a>
is required. Typically, this will be obtained by adding a duration to the
current time, obtained with a call to <a class="link" href="time.html#thread.time.deprecated.get_system_time" title="Non-member function get_system_time()"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">get_system_time</span><span class="special">()</span></code></a>.
e.g.
</p>
<pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">system_time</span> <span class="keyword">const</span> <span class="identifier">timeout</span><span class="special">=</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">get_system_time</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">milliseconds</span><span class="special">(</span><span class="number">500</span><span class="special">);</span>
<span class="keyword">extern</span> <span class="keyword">bool</span> <span class="identifier">done</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span> <span class="identifier">m</span><span class="special">;</span>
<span class="keyword">extern</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">condition_variable</span> <span class="identifier">cond</span><span class="special">;</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">unique_lock</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span><span class="special">></span> <span class="identifier">lk</span><span class="special">(</span><span class="identifier">m</span><span class="special">);</span>
<span class="keyword">while</span><span class="special">(!</span><span class="identifier">done</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">if</span><span class="special">(!</span><span class="identifier">cond</span><span class="special">.</span><span class="identifier">timed_wait</span><span class="special">(</span><span class="identifier">lk</span><span class="special">,</span><span class="identifier">timeout</span><span class="special">))</span>
<span class="special">{</span>
<span class="keyword">throw</span> <span class="string">"timed out"</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">}</span>
</pre>
<p>
For the overloads that accept a <span class="emphasis"><em>TimeDuration</em></span> parameter,
an object of any type that meets the <a class="link" href="../date_time/posix_time.html#date_time.posix_time.time_duration" title="Time Duration">Boost.Date_Time
Time Duration requirements</a> can be used, e.g.
</p>
<pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">this_thread</span><span class="special">::</span><span class="identifier">sleep</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">milliseconds</span><span class="special">(</span><span class="number">25</span><span class="special">));</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">mutex</span> <span class="identifier">m</span><span class="special">;</span>
<span class="keyword">if</span><span class="special">(</span><span class="identifier">m</span><span class="special">.</span><span class="identifier">timed_lock</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">nanoseconds</span><span class="special">(</span><span class="number">100</span><span class="special">)))</span>
<span class="special">{</span>
<span class="comment">// ...</span>
<span class="special">}</span>
</pre>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="thread.time.deprecated.system_time"></a><a class="link" href="time.html#thread.time.deprecated.system_time" title="Typedef system_time">Typedef <code class="computeroutput"><span class="identifier">system_time</span></code></a>
</h4></div></div></div>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">thread</span><span class="special">/</span><span class="identifier">thread_time</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="keyword">typedef</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="identifier">system_time</span><span class="special">;</span>
</pre>
<p>
See the documentation for <a class="link" href="../date_time/posix_time.html#date_time.posix_time.ptime_class" title="Ptime"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span class="identifier">ptime</span></code></a> in the Boost.Date_Time library.
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="thread.time.deprecated.get_system_time"></a><a class="link" href="time.html#thread.time.deprecated.get_system_time" title="Non-member function get_system_time()">Non-member
function <code class="computeroutput"><span class="identifier">get_system_time</span><span class="special">()</span></code></a>
</h4></div></div></div>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">thread</span><span class="special">/</span><span class="identifier">thread_time</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="identifier">system_time</span> <span class="identifier">get_system_time</span><span class="special">();</span>
</pre>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Returns:</span></dt>
<dd><p>
The current time.
</p></dd>
<dt><span class="term">Throws:</span></dt>
<dd><p>
Nothing.
</p></dd>
</dl>
</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 © 2007 -11 Anthony Williams<br>Copyright © 2011 -14 Vicente J. Botet Escriba<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>
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