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Diffstat (limited to 'src/libsystemd/sd_event_source_unref.xml')
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diff --git a/src/libsystemd/sd_event_source_unref.xml b/src/libsystemd/sd_event_source_unref.xml new file mode 100644 index 0000000000..2c4d450763 --- /dev/null +++ b/src/libsystemd/sd_event_source_unref.xml @@ -0,0 +1,142 @@ +<?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"> + +<!-- + 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/>. +--> + +<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> + <refentrytitle>sd_event_source_unref</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_event_source_unref</refname> + <refname>sd_event_source_unrefp</refname> + <refname>sd_event_source_ref</refname> + + <refpurpose>Increase or decrease event source reference counters</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-event.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>sd_event_source* <function>sd_event_source_unref</function></funcdef> + <paramdef>sd_event_source *<parameter>source</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>void <function>sd_event_source_unrefp</function></funcdef> + <paramdef>sd_event_source **<parameter>source</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>sd_event_source* <function>sd_event_source_ref</function></funcdef> + <paramdef>sd_event_source *<parameter>source</parameter></paramdef> + </funcprototype> + + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_event_source_unref()</function> may be used to + decrement by one the reference counter of the event source object + specified as <parameter>source</parameter>. The reference counter + is initially set to one, when the event source is created with calls + such as + <citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry> + or + <citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>. When + the reference counter reaches zero it is removed from its event loop + object and destroyed.</para> + + <para><function>sd_event_source_unrefp()</function> is similar to + <function>sd_event_source_unref()</function> but takes a pointer to a + pointer to an <type>sd_event_source</type> object. 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> + + <para><function>sd_event_source_ref()</function> may be used + to increase by one the reference counter of the event source object + specified as <parameter>source</parameter>.</para> + + <para><function>sd_event_source_unref()</function>, + <function>sd_bus_creds_unrefp()</function> and + <function>sd_bus_creds_ref()</function> execute no operation if + 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 + <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> + </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> + </refsect1> + + <xi:include href="libsystemd-pkgconfig.xml" /> + + <refsect1> + <title>See Also</title> + + <para> + <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_defer</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |