1<html><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 bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><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 name="API-eventfd-ctx-remove-wait-queue"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>eventfd_ctx_remove_wait_queue &#8212; 
2     Read the current counter and removes wait queue.
3 </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 <b class="fsfunc">eventfd_ctx_remove_wait_queue </b>(</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 name="idp1103136204"></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>
4     [in] Pointer to eventfd context.
5    </p></dd><dt><span class="term"><em class="parameter"><code>wait</code></em></span></dt><dd><p>
6     [in] Wait queue to be removed.
7    </p></dd><dt><span class="term"><em class="parameter"><code>cnt</code></em></span></dt><dd><p>
8     [out] Pointer to the 64-bit counter value.
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1103139876"></a><h2>Description</h2><p>
10   Returns <code class="constant">0</code> if successful, or the following error codes:
11   </p><p>
12
13   -EAGAIN      : The operation would have blocked.
14   </p><p>
15
16   This is used to atomically remove a wait queue entry from the eventfd wait
17   queue head, and read/reset the counter value.
18</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-eventfd-ctx-put.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="fs_events.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-eventfd-ctx-read.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">eventfd_ctx_put</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">eventfd_ctx_read</span></td></tr></table></div></body></html>
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