man/tip/nng_cv_alloc.3supp.html


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---
version: tip
layout: manpage_v2
title: nng_cv_alloc(3supp)
---
<h1>nng_cv_alloc(3supp)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_cv_alloc - allocate condition variable</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-k">typedef</span><span class="tok-w"> </span><span class="tok-k">struct</span><span class="tok-w"> </span><span class="tok-nc">nng_cv</span><span class="tok-w"> </span><span class="tok-n">nng_cv</span><span class="tok-p">;</span>

<span class="tok-kt">int</span><span class="tok-w"> </span><span class="tok-nf">nng_cv_alloc</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">cvp</span><span class="tok-p">,</span><span class="tok-w"> </span><span class="tok-n">nng_mtx</span><span class="tok-w"> </span><span class="tok-o">*</span><span class="tok-n">mtx</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_alloc()</code> function allocates a condition variable, using
the mutex <em>mtx</em>, and returns it in <em>cvp</em>.</p>
</div>
<div class="paragraph">
<p>Every condition variable is associated with a mutex, which must be
owned when a thread waits for the condition using
<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>.
The mutex must also be owned when signaling the condition using the
<a href="nng_cv_wake.3supp.html"><code>nng_cv_wake()</code></a> or
<a href="nng_cv_wake1.3supp.html"><code>nng_cv_wake1()</code></a> functions.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This function returns 0 on success, and non-zero otherwise.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="hdlist">
<table>
<tr>
<td class="hdlist1">
<code>NNG_ENOMEM</code>
</td>
<td class="hdlist2">
<p>Insufficient free memory exists.</p>
</td>
</tr>
</table>
</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_free.3supp.html">nng_cv_free(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_wake.3supp.html">nng_cv_wake(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_strerror.3.html">nng_strerror(3)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>