-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- SPDX-License-Identifier: LGPL-2.1+
-
- This file is part of systemd.
-
- Copyright 2015 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
<refentry id="sd_event_source_unref" xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_event_source_unref</title>
<productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
</refentryinfo>
<refmeta>
<refname>sd_event_source_unref</refname>
<refname>sd_event_source_unrefp</refname>
<refname>sd_event_source_ref</refname>
+ <refname>sd_event_source_disable_unref</refname>
+ <refname>sd_event_source_disable_unrefp</refname>
<refpurpose>Increase or decrease event source reference counters</refpurpose>
</refnamediv>
<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
</funcprototype>
+ <funcprototype>
+ <funcdef>sd_event_source* <function>sd_event_source_disable_unref</function></funcdef>
+ <paramdef>sd_event_source *<parameter>source</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>void <function>sd_event_source_disable_unrefp</function></funcdef>
+ <paramdef>sd_event_source **<parameter>source</parameter></paramdef>
+ </funcprototype>
</funcsynopsis>
</refsynopsisdiv>
the passed event source object is
<constant>NULL</constant>.</para>
- <para>Note that event source objects stay alive and may be
- dispatched as long as they have a reference counter greater than
- zero. In order to drop a reference of an event source and make
- sure the associated event source handler function is not called
- anymore it is recommended to combine a call of
+ <para>Note that event source objects stay alive and may be dispatched as long as they have a reference
+ counter greater than zero. In order to drop a reference of an event source and make sure the associated
+ event source handler function is not called anymore it is recommended to combine a call of
<function>sd_event_source_unref()</function> with a prior call to
- <function>sd_event_source_set_enabled()</function> with
- <constant>SD_EVENT_OFF</constant>.</para>
+ <function>sd_event_source_set_enabled()</function> with <constant>SD_EVENT_OFF</constant> or call
+ <function>sd_event_source_disable_unref()</function>, see below.</para>
+
+ <para><function>sd_event_source_disable_unref()</function> combines a call to
+ <function>sd_event_source_set_enabled()</function> with <constant>SD_EVENT_OFF</constant> with
+ <function>sd_event_source_unref()</function>. This ensures that the source is disabled before the local
+ reference to it is lost. The <parameter>source</parameter> parameter is allowed to be
+ <constant>NULL</constant>.</para>
+
+ <para><function>sd_event_source_disable_unrefp()</function> is similar to
+ <function>sd_event_source_unrefp()</function>, but in addition disables the source first. This call is
+ useful in conjunction with GCC's and LLVM's
+ <ulink url="https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html">Clean-up Variable
+ Attribute</ulink>. Note that this function is defined as inline function.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
- <para><function>sd_event_source_unref()</function> always returns
- <constant>NULL</constant>.
- <function>sd_event_source_ref()</function> always returns the
- event source object passed in.</para>
+ <para><function>sd_event_source_unref()</function> and
+ <function>sd_event_source_disable_unref()</function> always return <constant>NULL</constant>.
+ <function>sd_event_source_ref()</function> always returns the event source object passed in.</para>
</refsect1>
<xi:include href="libsystemd-pkgconfig.xml" />
<citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_event_add_child</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_child</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_inotify</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_event_add_defer</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
projects / thirdparty / systemd.git / blobdiff