man/tip/nng_cv_wake.3supp.html


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---
version: tip
layout: manpage_v2
title: nng_cv_wake(3supp)
---
<h1>nng_cv_wake(3supp)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_cv_wake - wake all waiters</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="c"><span></span><span class="tok-cp">#include</span><span class="tok-w"> </span><span class="tok-cpf">&lt;nng/nng.h&gt;</span>
<span class="tok-cp">#include</span><span class="tok-w"> </span><span class="tok-cpf">&lt;nng/supplemental/util/platform.h&gt;</span>

<span class="tok-kt">void</span><span class="tok-w"> </span><span class="tok-nf">nng_cv_wake</span><span class="tok-p">(</span><span class="tok-n">nng_cv</span><span class="tok-w"> </span><span class="tok-o">*</span><span class="tok-n">cv</span><span class="tok-p">);</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>nng_cv_wake()</code> wakes any threads waiting for the condition variable <em>cv</em>
to be signaled in the <a href="nng_cv_wait.3supp.html"><code>nng_cv_wait()</code></a> or
<a href="nng_cv_until.3supp.html"><code>nng_cv_until()</code></a> functions.</p>
</div>
<div class="paragraph">
<p>The caller must have have ownership of the mutex that was used when
<em>cv</em> was allocated.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
The caller should already have set the condition that the waiters
will check, while holding the mutex.
</td>
</tr>
</table>
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<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
This function wakes all threads, which is generally safer but can
lead to a performance problem when there are many waiters, as they are all
woken simultaneously and may contend for resources.
See <a href="nng_cv_wake1.3supp.html"><code>nng_cv_wake1()</code></a> for a solution to this problem.
</td>
</tr>
</table>
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<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
<div class="sectionbody">
<div class="paragraph">
<p>None.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>None.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph text-left">
<p><a href="nng_cv_alloc.3supp.html">nng_cv_alloc(3supp)</a>,
<a href="nng_cv_until.3supp.html">nng_cv_until(3supp)</a>,
<a href="nng_cv_wait.3supp.html">nng_cv_wait(3supp)</a>,
<a href="nng_cv_wake1.3supp.html">nng_cv_wake1(3supp)</a>,
<a href="nng_mtx_alloc.3supp.html">nng_mtx_alloc(3supp)</a>,
<a href="nng_mtx_lock.3supp.html">nng_mtx_lock(3supp)</a>,
<a href="nng_mtx_unlock.3supp.html">nng_mtx_unlock(3supp)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>