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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>__wake_up</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch01s03.html" title="Delaying, scheduling, and timer routines" /><link rel="prev" href="API-preempt-notifier-unregister.html" title="preempt_notifier_unregister" /><link rel="next" href="API---wake-up-sync-key.html" title="__wake_up_sync_key" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">__wake_up</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-preempt-notifier-unregister.html">Prev</a>&#160;</td><th width="60%" align="center">Delaying, scheduling, and timer routines</th><td width="20%" align="right">&#160;<a accesskey="n" href="API---wake-up-sync-key.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API---wake-up"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>__wake_up &#8212; 
     wake up threads blocked on a waitqueue.
 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <strong class="fsfunc">__wake_up </strong>(</code></td><td>wait_queue_head_t * <var class="pdparam">q</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">mode</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">nr_exclusive</var>, </td></tr><tr><td>&#160;</td><td>void * <var class="pdparam">key</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140404969450784"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>q</code></em></span></dt><dd><p>
     the waitqueue
    </p></dd><dt><span class="term"><em class="parameter"><code>mode</code></em></span></dt><dd><p>
     which threads
    </p></dd><dt><span class="term"><em class="parameter"><code>nr_exclusive</code></em></span></dt><dd><p>
     how many wake-one or wake-many threads to wake up
    </p></dd><dt><span class="term"><em class="parameter"><code>key</code></em></span></dt><dd><p>
     is directly passed to the wakeup function
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140404969442016"></a><h2>Description</h2><p>
   It may be assumed that this function implies a write memory barrier before
   changing the task state if and only if any tasks are woken up.
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