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<title>io_context::run (1 of 2 overloads)</title>
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../../../asio.png"></td></tr></table>
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<div class="titlepage"><div><div><h5 class="title">
<a name="asio.reference.io_context.run.overload1"></a><a class="link" href="overload1.html" title="io_context::run (1 of 2 overloads)">io_context::run
(1 of 2 overloads)</a>
</h5></div></div></div>
<p>
Run the <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
object's event processing loop.
</p>
<pre class="programlisting">count_type run();
</pre>
<p>
The <code class="computeroutput">run()</code> function blocks until all work has finished and
there are no more handlers to be dispatched, or until the <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
has been stopped.
</p>
<p>
Multiple threads may call the <code class="computeroutput">run()</code> function to set up a
pool of threads from which the <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
may execute handlers. All threads that are waiting in the pool are equivalent
and the <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
may choose any one of them to invoke a handler.
</p>
<p>
A normal exit from the <code class="computeroutput">run()</code> function implies that the
<a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
object is stopped (the <code class="computeroutput">stopped()</code> function returns <code class="computeroutput">true</code>).
Subsequent calls to <code class="computeroutput">run()</code>, <code class="computeroutput">run_one()</code>, <code class="computeroutput">poll()</code>
or <code class="computeroutput">poll_one()</code> will return immediately unless there is a
prior call to <code class="computeroutput">restart()</code>.
</p>
<h6>
<a name="asio.reference.io_context.run.overload1.h0"></a>
<span><a name="asio.reference.io_context.run.overload1.return_value"></a></span><a class="link" href="overload1.html#asio.reference.io_context.run.overload1.return_value">Return
Value</a>
</h6>
<p>
The number of handlers that were executed.
</p>
<h6>
<a name="asio.reference.io_context.run.overload1.h1"></a>
<span><a name="asio.reference.io_context.run.overload1.remarks"></a></span><a class="link" href="overload1.html#asio.reference.io_context.run.overload1.remarks">Remarks</a>
</h6>
<p>
Calling the <code class="computeroutput">run()</code> function from a thread that is currently
calling one of <code class="computeroutput">run()</code>, <code class="computeroutput">run_one()</code>, <code class="computeroutput">run_for()</code>,
<code class="computeroutput">run_until()</code>, <code class="computeroutput">poll()</code> or <code class="computeroutput">poll_one()</code>
on the same <a class="link" href="../../io_context.html" title="io_context"><code class="computeroutput">io_context</code></a>
object may introduce the potential for deadlock. It is the caller's reponsibility
to avoid this.
</p>
<p>
The <code class="computeroutput">poll()</code> function may also be used to dispatch ready handlers,
but without blocking.
</p>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
Kohlhoff<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>)
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