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authorStaysail Systems, Inc <info@staysail.tech>2024-02-22 01:03:04 -0800
committerGarrett D'Amore <garrett@damore.org>2024-02-22 01:04:43 -0800
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+---
+version: v1.7.2
+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>