From a8d46a1663c80e96508ed9bbd7c3acd55c5b4252 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Sat, 15 Oct 2016 15:24:55 -0400
Subject: man: add notes about thread safety of sd_journal_* functions

Fixes #4056.
---
 man/sd-journal.xml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'man/sd-journal.xml')

diff --git a/man/sd-journal.xml b/man/sd-journal.xml
index 936a83acf7..0f4b3e8eea 100644
--- a/man/sd-journal.xml
+++ b/man/sd-journal.xml
@@ -98,6 +98,21 @@
     tool.</para>
   </refsect1>
 
+  <refsect1>
+    <title>Thread safety</title>
+
+    <para>Functions that operate on the <structname>sd_journal</structname> object are thread
+    agnostic — given <structname>sd_journal</structname> pointer may only be used from one thread at
+    a time, but multiple threads may use multiple such objects safely. Other functions —
+    those that are used to send entries to the journal, like
+    <citerefentry><refentrytitle>sd_journal_print</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    and similar, or those that are used to retrieve global information like
+    <citerefentry><refentrytitle>sd_journal_stream_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    and
+    <citerefentry><refentrytitle>sd_journal_get_catalog_for_message_id</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    — are thread-safe and may be called from multiple threads in parallel.</para>
+  </refsect1>
+
   <xi:include href="libsystemd-pkgconfig.xml" />
 
   <refsect1>
-- 
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