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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>wait_event_interruptible_exclusive_locked</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="ch01s04.html" title="Wait queues and Wake events" /><link rel="prev" href="API-wait-event-interruptible-locked-irq.html" title="wait_event_interruptible_locked_irq" /><link rel="next" href="API-wait-event-interruptible-exclusive-locked-irq.html" title="wait_event_interruptible_exclusive_locked_irq" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">wait_event_interruptible_exclusive_locked</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-wait-event-interruptible-locked-irq.html">Prev</a>&#160;</td><th width="60%" align="center">Wait queues and Wake events</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-wait-event-interruptible-exclusive-locked-irq.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-wait-event-interruptible-exclusive-locked"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>wait_event_interruptible_exclusive_locked &#8212; 
     sleep exclusively until a condition gets true
 </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"> <strong class="fsfunc">wait_event_interruptible_exclusive_locked </strong>(</code></td><td> <var class="pdparam">wq</var>, </td></tr><tr><td>&#160;</td><td> <var class="pdparam">condition</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140404968356032"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>wq</code></em></span></dt><dd><p>
     the waitqueue to wait on
    </p></dd><dt><span class="term"><em class="parameter"><code>condition</code></em></span></dt><dd><p>
     a C expression for the event to wait for
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140404968351072"></a><h2>Description</h2><p>
   The process is put to sleep (TASK_INTERRUPTIBLE) until the
   <em class="parameter"><code>condition</code></em> evaluates to true or a signal is received.
   The <em class="parameter"><code>condition</code></em> is checked each time the waitqueue <em class="parameter"><code>wq</code></em> is woken up.
   </p><p>

   It must be called with wq.lock being held.  This spinlock is
   unlocked while sleeping but <em class="parameter"><code>condition</code></em> testing is done while lock
   is held and when this macro exits the lock is held.
   </p><p>

   The lock is locked/unlocked using <code class="function">spin_lock</code>/<code class="function">spin_unlock</code>
   functions which must match the way they are locked/unlocked outside
   of this macro.
   </p><p>

   The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
   set thus when other process waits process on the list if this
   process is awaken further processes are not considered.
   </p><p>

   <code class="function">wake_up_locked</code> has to be called after changing any variable that could
   change the result of the wait condition.
   </p><p>

   The function will return -ERESTARTSYS if it was interrupted by a
   signal and 0 if <em class="parameter"><code>condition</code></em> evaluated to true.
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