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0066eddda7203f6345b56f77d146a759298dc635gryzor<title>leader - Apache HTTP Server</title>
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d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen<p class="apache">Apache HTTP Server Version 2.1</p>
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0066eddda7203f6345b56f77d146a759298dc635gryzor<div id="preamble"><h1>Apache MPM leader</h1>
0066eddda7203f6345b56f77d146a759298dc635gryzor<div class="toplang">
0066eddda7203f6345b56f77d146a759298dc635gryzor<p><span>Available Languages: </span><a href="/de/mod/leader.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
3f08db06526d6901aa08c110b5bc7dde6bc39905nd<a href="/en/mod/leader.html" title="English">&nbsp;en&nbsp;</a> |
0066eddda7203f6345b56f77d146a759298dc635gryzor<a href="/ko/mod/leader.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
0066eddda7203f6345b56f77d146a759298dc635gryzor</div>
0066eddda7203f6345b56f77d146a759298dc635gryzor<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>An experimental variant of the standard <code class="module"><a href="/mod/worker.html">worker</a></code>
0066eddda7203f6345b56f77d146a759298dc635gryzorMPM</td></tr>
0066eddda7203f6345b56f77d146a759298dc635gryzor<tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr>
0066eddda7203f6345b56f77d146a759298dc635gryzor<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>mpm_leader_module</td></tr>
f086b4b402fa9a2fefc7dda85de2a3cc1cd0a654rjung<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>leader.c</td></tr></table>
0066eddda7203f6345b56f77d146a759298dc635gryzor<h3>Summary</h3>
0066eddda7203f6345b56f77d146a759298dc635gryzor
0066eddda7203f6345b56f77d146a759298dc635gryzor <div class="warning"><h3>Warning</h3>
0066eddda7203f6345b56f77d146a759298dc635gryzor <p>This MPM is experimental, so it may or may not work
1a1356f375e36db7bee379ea0684ab389579f798rbowen as expected.</p>
0066eddda7203f6345b56f77d146a759298dc635gryzor </div>
0066eddda7203f6345b56f77d146a759298dc635gryzor
0066eddda7203f6345b56f77d146a759298dc635gryzor <p>This is an experimental variant of the standard
0066eddda7203f6345b56f77d146a759298dc635gryzor <code class="module"><a href="/mod/worker.html">worker</a></code> MPM. It uses a Leader/Followers design pattern
0066eddda7203f6345b56f77d146a759298dc635gryzor 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>
0066eddda7203f6345b56f77d146a759298dc635gryzor
0066eddda7203f6345b56f77d146a759298dc635gryzor <p>To use the <code class="module"><a href="/mod/leader.html">leader</a></code> MPM, add
0066eddda7203f6345b56f77d146a759298dc635gryzor <code>--with-mpm=leader</code> to the <code>configure</code> script's
0066eddda7203f6345b56f77d146a759298dc635gryzor arguments when building the <code>httpd</code>.</p>
0066eddda7203f6345b56f77d146a759298dc635gryzor
1f1b6bf13313fdd14a45e52e553d3ff28689b717coar <p>This MPM depends on APR's atomic compare-and-swap operations for
01f52ba6a87aa39d3873a441369828875c471823trawick thread synchronization. If you are compiling for an x86 target
01f52ba6a87aa39d3873a441369828875c471823trawick and you don't need to support 386s, or you are compiling for a
1f1b6bf13313fdd14a45e52e553d3ff28689b717coar SPARC and you don't need to run on pre-UltraSPARC chips, add
1f1b6bf13313fdd14a45e52e553d3ff28689b717coar <code>--enable-nonportable-atomics=yes</code> to the <code>configure</code>
1f1b6bf13313fdd14a45e52e553d3ff28689b717coar script's arguments. This will cause APR to implement atomic operations
0066eddda7203f6345b56f77d146a759298dc635gryzor using efficient opcodes not available in older CPUs.</p>
0066eddda7203f6345b56f77d146a759298dc635gryzor</div>
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh<div id="quickview"><h3 class="directives">Directives</h3>
01f52ba6a87aa39d3873a441369828875c471823trawick<ul id="toc">
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#acceptmutex">AcceptMutex</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li>
0066eddda7203f6345b56f77d146a759298dc635gryzor<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#enableexceptionhook">EnableExceptionHook</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#group">Group</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#listen">Listen</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#listenbacklog">ListenBacklog</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#lockfile">LockFile</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#maxclients">MaxClients</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#maxmemfree">MaxMemFree</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></li>
8d71cfe50621fe78b960ccef99680b89bb61170elgentis<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#maxsparethreads">MaxSpareThreads</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#minsparethreads">MinSpareThreads</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#pidfile">PidFile</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#serverlimit">ServerLimit</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#startservers">StartServers</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#threadlimit">ThreadLimit</a></li>
20f499565e77defe9dab24dd85c02f38a1175855nd<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#threadsperchild">ThreadsPerChild</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#threadstacksize">ThreadStackSize</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#user">User</a></li>
01f52ba6a87aa39d3873a441369828875c471823trawick</ul>
01f52ba6a87aa39d3873a441369828875c471823trawick</div>
01f52ba6a87aa39d3873a441369828875c471823trawick
01f52ba6a87aa39d3873a441369828875c471823trawick</div>
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01f52ba6a87aa39d3873a441369828875c471823trawick<p><span>Available Languages: </span><a href="/de/mod/leader.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
01f52ba6a87aa39d3873a441369828875c471823trawick<a href="/en/mod/leader.html" title="English">&nbsp;en&nbsp;</a> |
20f499565e77defe9dab24dd85c02f38a1175855nd<a href="/ko/mod/leader.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
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01f52ba6a87aa39d3873a441369828875c471823trawick<p class="apache">Copyright 1999-2004 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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