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+<table class="head">
+  <tr>
+    <td class="head-ltitle">SELRECORD(9)</td>
+    <td class="head-vol">Kernel Developer's Manual</td>
+    <td class="head-rtitle">SELRECORD(9)</td>
+  </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">seldrain</code>,
+    <code class="Nm">selrecord</code>, <code class="Nm">selwakeup</code>
+    &#x2014; <span class="Nd">record and wakeup select requests</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp"><code class="In">#include
+    &lt;<a class="In">sys/param.h</a>&gt;</code>
+  <br/>
+  <code class="In">#include &lt;<a class="In">sys/selinfo.h</a>&gt;</code></p>
+<p class="Pp"><var class="Ft">void</var>
+  <br/>
+  <code class="Fn">seldrain</code>(<var class="Fa" style="white-space: nowrap;">struct
+    selinfo *sip</var>);</p>
+<p class="Pp"><var class="Ft">void</var>
+  <br/>
+  <code class="Fn">selrecord</code>(<var class="Fa" style="white-space: nowrap;">struct
+    thread *td</var>, <var class="Fa" style="white-space: nowrap;">struct
+    selinfo *sip</var>);</p>
+<p class="Pp"><var class="Ft">void</var>
+  <br/>
+  <code class="Fn">selwakeup</code>(<var class="Fa" style="white-space: nowrap;">struct
+    selinfo *sip</var>);</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp"><a class="permalink" href="#seldrain"><code class="Fn" id="seldrain">seldrain</code></a>(),
+    <code class="Fn">selrecord</code>() and <code class="Fn">selwakeup</code>()
+    are the three central functions used by <a class="Xr">select(2)</a>,
+    <a class="Xr">poll(2)</a> and the objects that are being selected on. They
+    handle the task of recording which threads are waiting on which objects and
+    the waking of the proper threads when an event of interest occurs on an
+    object.</p>
+<p class="Pp" id="selrecord"><a class="permalink" href="#selrecord"><code class="Fn">selrecord</code></a>()
+    records that the calling thread is interested in events related to a given
+    object. If another thread is already waiting on the object a collision will
+    be flagged in <var class="Fa">sip</var> which will be later dealt with by
+    <code class="Fn">selwakeup</code>().</p>
+<p class="Pp" id="selrecord~2"><a class="permalink" href="#selrecord~2"><code class="Fn">selrecord</code></a>()
+    acquires and releases <var class="Va">sellock</var>.</p>
+<p class="Pp" id="selwakeup"><a class="permalink" href="#selwakeup"><code class="Fn">selwakeup</code></a>()
+    is called by the underlying object handling code in order to notify any
+    waiting threads that an event of interest has occurred. If a collision has
+    occurred, <code class="Fn">selwakeup</code>() will increment
+    <var class="Va">nselcoll</var>, and broadcast on the global cv in order to
+    wake all waiting threads so that they can handle it. If the thread waiting
+    on the object is not currently sleeping or the wait channel is not
+    <var class="Va">selwait</var>, <code class="Fn">selwakeup</code>() will
+    clear the <code class="Dv">TDF_SELECT</code> flag which should be noted by
+    <a class="Xr">select(2)</a> and <a class="Xr">poll(2)</a> when they wake
+  up.</p>
+<p class="Pp" id="seldrain~2"><a class="permalink" href="#seldrain~2"><code class="Fn">seldrain</code></a>()
+    will flush the waiters queue on a specified object before its destruction.
+    The object handling code must ensure that <var class="Fa">*sip</var> cannot
+    be used once <code class="Fn">seldrain</code>() has been called.</p>
+<p class="Pp" id="selrecord~3">The contents of <var class="Fa">*sip</var> must
+    be zeroed, such as by softc initialization, before any call to
+    <a class="permalink" href="#selrecord~3"><code class="Fn">selrecord</code></a>()
+    or <code class="Fn">selwakeup</code>(), otherwise a panic may occur.
+    <code class="Fn">selwakeup</code>() acquires and releases
+    <var class="Va">sellock</var> and may acquire and release
+    <var class="Va">sched_lock</var>. <code class="Fn">seldrain</code>() could
+    usually be just a wrapper for <code class="Fn">selwakeup</code>(), but
+    consumers should not generally rely on this feature.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+  ALSO</a></h1>
+<p class="Pp"><a class="Xr">poll(2)</a>, <a class="Xr">select(2)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp">This manual page was written by <span class="An">Chad David</span>
+    &lt;<a class="Mt" href="mailto:davidc@FreeBSD.org">davidc@FreeBSD.org</a>&gt;
+    and <span class="An">Alfred Perlstein</span>
+    &lt;<a class="Mt" href="mailto:alfred@FreeBSD.org">alfred@FreeBSD.org</a>&gt;.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">August 25, 2011</td>
+    <td class="foot-os">FreeBSD 15.0</td>
+  </tr>
+</table>