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<link title="Pa_lwt_log" rel="Chapter" href="Pa_lwt_log.html"><title>Lwt_engine.poll_based</title>
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<h1>Class virtual <a href="type_Lwt_engine.poll_based.html">Lwt_engine.poll_based</a></h1>
<pre><span name="TYPEpoll_based"><span class="keyword">class</span> <span class="keyword">virtual</span> poll_based</span> : <code class="type"></code><code class="code"><span class="keyword">object</span></code> <a href="Lwt_engine.poll_based-c.html">..</a> <code class="code"><span class="keyword">end</span></code></pre><div class="info class top">
Abstract class for engines based on a poll-like function.<br>
</div>
<b>Inherits</b><ul>
<li><a href="Lwt_engine.t-c.html"><code class="code"><span class="constructor">Lwt_engine</span>.t</code></a></li>
</ul>
<hr width="100%">
<pre><span id="METHODpoll"><span class="keyword">method</span> <span class="keyword">private</span> <span class="keyword">virtual</span> poll</span> : <code class="type">(Unix.file_descr * bool * bool) list -><br> float -> (Unix.file_descr * bool * bool) list</code></pre><div class="info ">
<code class="code">poll fds tiomeout</code>, where <code class="code">fds</code> is a list of tuples of the
form <code class="code">(fd, check_readable, check_writable)</code>, waits for either:
<p>
<ul>
<li>one of the file descriptor with <code class="code">check_readable</code> set to
<code class="code"><span class="keyword">true</span></code> to become readable</li>
<li>one of the file descriptor with <code class="code">check_writable</code> set to
<code class="code"><span class="keyword">true</span></code> to become writable</li>
<li>timeout to expire</li>
</ul>
and returns the list of file descriptors with their readable
and writable status.<br>
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