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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>seq_hlist_start_rcu</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /><link rel="home" href="index.html" title="Linux Filesystems API" /><link rel="up" href="other_functions.html" title="Other Functions" /><link rel="prev" href="API-seq-hlist-next.html" title="seq_hlist_next" /><link rel="next" href="API-seq-hlist-start-head-rcu.html" title="seq_hlist_start_head_rcu" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>seq_hlist_start_rcu</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-seq-hlist-next.html">Prev</a> </td><th width="60%" align="center">Other Functions</th><td width="20%" align="right"> <a accesskey="n" href="API-seq-hlist-start-head-rcu.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="seq_hlist_start_rcu"><a id="API-seq-hlist-start-rcu"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>seq_hlist_start_rcu —
start an iteration of a hlist protected by RCU
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">struct hlist_node * <strong>fsfuncseq_hlist_start_rcu </strong>(</code></td><td>struct hlist_head * <var class="pdparam">head</var>, </td></tr><tr><td> </td><td>loff_t <var class="pdparam">pos</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2757000"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>head</code></em></span></dt><dd><p>
the head of the hlist
</p></dd><dt><span class="term"><em class="parameter"><code>pos</code></em></span></dt><dd><p>
the start position of the sequence
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2757044"></a><h2>Description</h2><p>
Called at seq_file->op-><code class="function">start</code>.
</p><p>
This list-traversal primitive may safely run concurrently with
the _rcu list-mutation primitives such as <code class="function">hlist_add_head_rcu</code>
as long as the traversal is guarded by <code class="function">rcu_read_lock</code>.
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