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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>eventfd_ctx_remove_wait_queue</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="Linux Filesystems API" /><link rel="up" href="fs_events.html" title="Chapter&#160;3.&#160;Events based on file descriptors" /><link rel="prev" href="API-eventfd-ctx-put.html" title="eventfd_ctx_put" /><link rel="next" href="API-eventfd-ctx-read.html" title="eventfd_ctx_read" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">eventfd_ctx_remove_wait_queue</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-eventfd-ctx-put.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;3.&#160;Events based on file descriptors</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-eventfd-ctx-read.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-eventfd-ctx-remove-wait-queue"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>eventfd_ctx_remove_wait_queue &#8212; 
     Read the current counter and removes wait queue.
 </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">int <strong class="fsfunc">eventfd_ctx_remove_wait_queue </strong>(</code></td><td>struct eventfd_ctx * <var class="pdparam">ctx</var>, </td></tr><tr><td>&#160;</td><td>wait_queue_t * <var class="pdparam">wait</var>, </td></tr><tr><td>&#160;</td><td>__u64 * <var class="pdparam">cnt</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm139881793681664"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>ctx</code></em></span></dt><dd><p>
     [in] Pointer to eventfd context.
    </p></dd><dt><span class="term"><em class="parameter"><code>wait</code></em></span></dt><dd><p>
     [in] Wait queue to be removed.
    </p></dd><dt><span class="term"><em class="parameter"><code>cnt</code></em></span></dt><dd><p>
     [out] Pointer to the 64-bit counter value.
    </p></dd></dl></div></div><div class="refsect1"><a id="idm139881793674448"></a><h2>Description</h2><p>
   Returns <code class="constant">0</code> if successful, or the following error codes:
   </p><p>

   -EAGAIN      : The operation would have blocked.
   </p><p>

   This is used to atomically remove a wait queue entry from the eventfd wait
   queue head, and read/reset the counter value.
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