Adds asio library and Storage Module

lib/asio-1.18.0/doc/asio/reference/synchronous_socket_operations.html

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+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.reference.synchronous_socket_operations"></a><a class="link" href="synchronous_socket_operations.html" title="Requirements on synchronous socket operations">Requirements
+      on synchronous socket operations</a>
+</h3></div></div></div>
+<p>
+        In this section, <span class="emphasis"><em>synchronous socket operations</em></span> are those
+        member functions specified as two overloads, with and without an argument
+        of type <code class="computeroutput">error_code&amp;</code>:
+      </p>
+<pre class="programlisting"><span class="bold"><strong><span class="emphasis"><em>R f</em></span></strong></span>(<span class="emphasis"><em><span class="bold"><strong>A1</strong></span></em></span> a1, <span class="emphasis"><em><span class="bold"><strong>A2</strong></span></em></span> a2, ..., <span class="emphasis"><em><span class="bold"><strong>AN</strong></span></em></span> aN);
+<span class="bold"><strong><span class="emphasis"><em>R f</em></span></strong></span>(<span class="emphasis"><em><span class="bold"><strong>A1</strong></span></em></span> a1, <span class="emphasis"><em><span class="bold"><strong>A2</strong></span></em></span> a2, ..., <span class="emphasis"><em><span class="bold"><strong>AN</strong></span></em></span> aN, error_code&amp; ec);
+</pre>
+<p>
+        For an object <code class="computeroutput">s</code>, the conditions under which its synchronous
+        socket operations may block the calling thread (C++Std [defns.block]) are
+        determined as follows.
+      </p>
+<p>
+        If:
+      </p>
+<p>
+        — <code class="computeroutput">s.non_blocking() == true</code>,
+      </p>
+<p>
+        — the synchronous socket operation is specified in terms of a <span class="emphasis"><em>POSIX</em></span>
+        function other than <code class="computeroutput"><a href="http://www.opengroup.org/onlinepubs/9699919799/functions/poll.html" target="_top"><code class="computeroutput"><span class="identifier">poll</span><span class="special">()</span></code></a></code>,
+      </p>
+<p>
+        — that <span class="emphasis"><em>POSIX</em></span> function lists <code class="computeroutput">EWOULDBLOCK</code> or
+        <code class="computeroutput">EAGAIN</code> in its failure conditions, and
+      </p>
+<p>
+        — the effects of the operation cannot be established immediately
+      </p>
+<p>
+        then the synchronous socket operation shall not block the calling thread.
+        [<span class="emphasis"><em>Note:</em></span> And the effects of the operation are not established.
+        —<span class="emphasis"><em>end note</em></span>]
+      </p>
+<p>
+        Otherwise, the synchronous socket operation shall block the calling thread
+        until the effects are established.
+      </p>
+</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 © 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>)
+      </p>
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