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157 lines
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
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<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" />
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<!--
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>mpm_winnt - Apache HTTP Server Version 2.5</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<script src="../style/scripts/prettify.min.js" type="text/javascript">
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</script>
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body>
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<div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.png" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Apache MPM winnt</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> |
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<a href="../en/mod/mpm_winnt.html" title="English"> en </a> |
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<a href="../fr/mod/mpm_winnt.html" hreflang="fr" rel="alternate" title="Fran<61>ais"> fr </a> |
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<a href="../ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Multi-Processing Module optimized for Windows NT.</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module<EFBFBD>Identifier:</a></th><td>mpm_winnt_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source<EFBFBD>File:</a></th><td>mpm_winnt.c</td></tr></table>
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<h3>Summary</h3>
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<p>This Multi-Processing Module (MPM) is the default for the
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Windows NT operating systems. It uses a single control process
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which launches a single child process which in turn creates
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threads to handle requests</p>
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<p>Capacity is configured using the
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<code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> directive,
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which sets the maximum number of concurrent client connections.</p>
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<p>By default, this MPM uses advanced Windows APIs for accepting
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new client connections. In some configurations, third-party products
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may interfere with this implementation, with the following messages
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written to the web server log:</p>
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<div class="example"><p><code>
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Child: Encountered too many AcceptEx faults accepting client connections.<br />
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winnt_mpm: falling back to 'AcceptFilter none'.
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</code></p></div>
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<p>The MPM falls back to a safer implementation, but some client requests
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were not processed correctly. In order to avoid this error, use
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<code class="directive"><a href="../mod/core.html#acceptfilter">AcceptFilter</a></code> with accept filter
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<code>none</code>.</p>
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<pre class="prettyprint lang-config">AcceptFilter http none
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AcceptFilter https none</pre>
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<p><em>In Apache httpd 2.0 and 2.2,
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<code class="directive">Win32DisableAcceptEx</code> was used for this purpose.</em></p>
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<p>The WinNT MPM differs from the Unix MPMs such as worker and event
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in several areas:</p>
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<ul>
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<li>When a child process is exiting due to shutdown, restart, or
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<code class="directive"><a href="../mod/mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></code>,
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active requests in the exiting process have
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<code class="directive"><a href="../mod/core.html#timeout">TimeOut</a></code> seconds to finish before
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processing is aborted. Alternate types of restart and shutdown are not
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implemented.</li>
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<li>New child processes read the configuration files instead of
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inheriting the configuration from the parent. The behavior will
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be the same as on Unix if the child process is created at startup
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or restart, but if a child process is created because the prior
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one crashed or reached
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<code class="directive"><a href="../mod/mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></code>,
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any pending changes to the configuration will become active in the
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child at that point, and the parent and child will be using a
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different configuration. If planned configuration changes have been
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partially implemented and the current configuration cannot be
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parsed, the replacement child process cannot start up and the server
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will halt. Because of this behavior, configuration files should not
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be changed until the time of a server restart.</li>
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<li>The <code>monitor</code> and <code>fatal_exception</code> hooks
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are not currently implemented.</li>
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<li><code class="directive">AcceptFilter</code> is implemented in the MPM
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and has a different type of control over handling of new connections.
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(Refer to the <code class="directive"><a href="../mod/core.html#acceptfilter">AcceptFilter</a></code>
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documentation for details.)</li>
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</ul>
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</div>
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<div id="quickview"><h3 class="directives">Directives</h3>
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<ul id="toc">
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<li><img alt="" src="../images/right.gif" /> <a href="core.html#acceptfilter">AcceptFilter</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listen">Listen</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listenbacklog">ListenBacklog</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxmemfree">MaxMemFree</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#pidfile">PidFile</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#receivebuffersize">ReceiveBufferSize</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadlimit">ThreadLimit</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadsperchild">ThreadsPerChild</a></li>
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<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadstacksize">ThreadStackSize</a></li>
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</ul>
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<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mpm_winnt">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mpm_winnt">Report a bug</a></li></ul><h3>See also</h3>
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<ul class="seealso">
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<li><a href="../platform/windows.html">Using Apache HTTP Server on Microsoft Windows</a></li>
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<li><a href="#comments_section">Comments</a></li></ul></div>
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</div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> |
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<a href="../en/mod/mpm_winnt.html" title="English"> en </a> |
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<a href="../fr/mod/mpm_winnt.html" hreflang="fr" rel="alternate" title="Fran<61>ais"> fr </a> |
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<a href="../ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p>
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</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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<p class="apache">Copyright 2017 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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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
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