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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 294369 $ -->
<refentry xml:id="gearmanclient.dobackground" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>GearmanClient::doBackground</refname>
<refpurpose>Run a task in the background</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <type>string</type><methodname>GearmanClient::doBackground</methodname>
<methodparam><type>string</type><parameter>function_name</parameter></methodparam>
<methodparam><type>string</type><parameter>workload</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>unique</parameter></methodparam>
</methodsynopsis>
<para>
Runs a task in the background, returning a job handle which can be used
to get the status of the running task.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>function_name</parameter></term>
<listitem>
<para>
&gearman.parameter.functionname;
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>workload</parameter></term>
<listitem>
<para>
&gearman.parameter.workload;
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>unique</parameter></term>
<listitem>
<para>
&gearman.parameter.unique;
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The job handle for the submitted task.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Submit and monitor a background job</title>
<para>
The worker in this example has an artificial delay introduced to mimic
a long running job. The client script periodically checks the status
of the running job.
</para>
<programlisting role="php">
<![CDATA[
<?php
/* create our object */
$gmclient= new GearmanClient();
/* add the default server */
$gmclient->addServer();
/* run reverse client */
$job_handle = $gmclient->doBackground("reverse", "this is a test");
if ($gmclient->returnCode() != GEARMAN_SUCCESS)
{
echo "bad return code\n";
exit;
}
$done = false;
do
{
sleep(3);
$stat = $gmclient->jobStatus($job_handle);
if (!$stat[0]) // the job is known so it is not done
$done = true;
echo "Running: " . ($stat[1] ? "true" : "false") . ", numerator: " . $stat[2] . ", denomintor: " . $stat[3] . "\n";
}
while(!$done);
echo "done!\n";
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Running: true, numerator: 3, denomintor: 14
Running: true, numerator: 6, denomintor: 14
Running: true, numerator: 9, denomintor: 14
Running: true, numerator: 12, denomintor: 14
Running: false, numerator: 0, denomintor: 0
done!
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><methodname>GearmanClient::do</methodname></member>
<member><methodname>GearmanClient::doHigh</methodname></member>
<member><methodname>GearmanClient::doLow</methodname></member>
<member><methodname>GearmanClient::doHighBackground</methodname></member>
<member><methodname>GearmanClient::doLowBackground</methodname></member>
</simplelist>
</para>
</refsect1>
</refentry>
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