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<?xml version="1.0"?>
<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
<!-- $LastChangedRevision$ -->
<!--
Copyright 2002-2006 The Apache Software Foundation or its licensors, as
applicable.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<modulesynopsis metafile="leader.xml.meta">
<name>leader</name>
<description>An experimental variant of the standard <module>worker</module>
MPM</description>
<status>MPM</status>
<sourcefile>leader.c</sourcefile>
<identifier>mpm_leader_module</identifier>
<summary>
<note type="warning"><title>Warning</title>
<p>This MPM is experimental, so it may or may not work
as expected.</p>
</note>
<p>This is an experimental variant of the standard
<module>worker</module> MPM. It uses a Leader/Followers design pattern
to coordinate work among threads. For more info, see <a
href="http://deuce.doc.wustl.edu/doc/pspdfs/lf.pdf"
>http://deuce.doc.wustl.edu/doc/pspdfs/lf.pdf</a>.</p>
<p>To use the <module>leader</module> MPM, add
<code>--with-mpm=leader</code> to the <program>configure</program>
script's arguments when building the <program>httpd</program>.</p>
</summary>
<seealso><a href="worker.html">The worker MPM</a></seealso>
<section id="requirements"><title>Requirements</title>
<p>This MPM depends on APR's atomic compare-and-swap operations for
thread synchronization. If you are compiling for an x86 target
and you don't need to support 386s, or you are compiling for a
SPARC and you don't need to run on pre-UltraSPARC chips, add
<code>--enable-nonportable-atomics=yes</code> to the
<program>configure</program> script's arguments. This will cause
APR to implement atomic operations
using efficient opcodes not available in older CPUs.</p>
</section>
<directivesynopsis location="mpm_common"><name>AcceptMutex</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>CoreDumpDirectory</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>EnableExceptionHook</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>Group</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>Listen</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>ListenBacklog</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>ReceiveBufferSize</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>SendBufferSize</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>LockFile</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>MaxClients</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>MaxMemFree</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>MaxRequestsPerChild</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>MaxSpareThreads</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>MinSpareThreads</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>PidFile</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>ScoreBoardFile</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>ServerLimit</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>StartServers</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>ThreadLimit</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>ThreadsPerChild</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>ThreadStackSize</name>
</directivesynopsis>
<directivesynopsis location="mpm_common"><name>User</name>
</directivesynopsis>
</modulesynopsis>
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