man/tip/nng_pull.7.html


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---
version: tip
layout: manpage_v2
title: nng_pull(7)
---
<h1>nng_pull(7)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_pull - pull protocol</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/protocol/pipeline0/pull.h&gt;</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>
The <em>pull</em> protocol is one half of a pipeline pattern.
The other half is the <a href="nng_push.7.html"><em>push</em></a> protocol.</p>
</div>
<div class="paragraph">
<p>In the pipeline pattern, pushers distribute messages to pullers.
Each message sent
by a pusher will be sent to one of its peer pullers,
chosen in a round-robin fashion
from the set of connected peers available for receiving.
This property makes this pattern useful in load-balancing scenarios.</p>
</div>
<div class="sect2">
<h3 id="_socket_operations">Socket Operations</h3>
<div class="paragraph">
<p>The <a href="nng_pull_open.3.html"><code>nng_pull0_open()</code></a> functions create a puller socket.
This socket may be used to receive messages, but is unable to send them.
Attempts to send messages will result in <code>NNG_ENOTSUP</code>.</p>
</div>
<div class="paragraph">
<p>When receiving messages, the <em>pull</em> protocol accepts messages as
they arrive from peers.
If two peers both have a message ready, the
order in which messages are handled is undefined.</p>
</div>
</div>
<div class="sect2">
<h3 id="_protocol_versions">Protocol Versions</h3>
<div class="paragraph">
<p>Only version 0 of this protocol is supported.
(At the time of writing, no other versions of this protocol have been defined.)</p>
</div>
</div>
<div class="sect2">
<h3 id="_protocol_options">Protocol Options</h3>
<div class="paragraph">
<p>The <em>pull</em> protocol has no protocol-specific options.</p>
</div>
</div>
<div class="sect2">
<h3 id="_protocol_headers">Protocol Headers</h3>
<div class="paragraph">
<p>The <em>pull</em> protocol has no protocol-specific headers.</p>
</div>
</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_pull_open.3.html">nng_pull_open(3)</a>,
<a href="nng_push.7.html">nng_push(7)</a>,
<a href="nng.7.html">nng(7)</a>,</p>
</div>
</div>
</div>