| <?xml version="1.0" encoding="UTF-8"?> |
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
| <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> |
| <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> |
| <!-- |
| XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX |
| This file is generated from xml source: DO NOT EDIT |
| XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX |
| --> |
| <title>mpm_winnt - Apache HTTP Server Version 2.5</title> |
| <link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> |
| <link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> |
| <link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> |
| <script src="../style/scripts/prettify.min.js" type="text/javascript"> |
| </script> |
| |
| <link href="../images/favicon.png" rel="shortcut icon" /></head> |
| <body> |
| <div id="page-header"> |
| <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> |
| <p class="apache">Apache HTTP Server Version 2.5</p> |
| <img alt="" src="../images/feather.png" /></div> |
| <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> |
| <div id="path"> |
| <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> |
| <div id="page-content"> |
| <div id="preamble"><h1>Apache MPM winnt</h1> |
| <div class="toplang"> |
| <p><span>Available Languages: </span><a href="../de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | |
| <a href="../en/mod/mpm_winnt.html" title="English"> en </a> | |
| <a href="../fr/mod/mpm_winnt.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | |
| <a href="../ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p> |
| </div> |
| <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Multi-Processing Module optimized for Windows NT.</td></tr> |
| <tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr> |
| <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>mpm_winnt_module</td></tr> |
| <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mpm_winnt.c</td></tr></table> |
| <h3>Summary</h3> |
| |
| <p>This Multi-Processing Module (MPM) is the default for the |
| Windows NT operating systems. It uses a single control process |
| which launches a single child process which in turn creates |
| threads to handle requests</p> |
| |
| <p>Capacity is configured using the |
| <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> directive, |
| which sets the maximum number of concurrent client connections.</p> |
| |
| <p>By default, this MPM uses advanced Windows APIs for accepting |
| new client connections. In some configurations, third-party products |
| may interfere with this implementation, with the following messages |
| written to the web server log:</p> |
| |
| <div class="example"><p><code> |
| Child: Encountered too many AcceptEx faults accepting client connections.<br /> |
| winnt_mpm: falling back to 'AcceptFilter none'. |
| </code></p></div> |
| |
| <p>The MPM falls back to a safer implementation, but some client requests |
| were not processed correctly. In order to avoid this error, use |
| <code class="directive"><a href="../mod/core.html#acceptfilter">AcceptFilter</a></code> with accept filter |
| <code>none</code>.</p> |
| |
| <pre class="prettyprint lang-config">AcceptFilter http none |
| AcceptFilter https none</pre> |
| |
| |
| <p><em>In Apache httpd 2.0 and 2.2, |
| <code class="directive">Win32DisableAcceptEx</code> was used for this purpose.</em></p> |
| |
| <p>The WinNT MPM differs from the Unix MPMs such as worker and event |
| in several areas:</p> |
| |
| <ul> |
| <li>When a child process is exiting due to shutdown, restart, or |
| <code class="directive"><a href="../mod/mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></code>, |
| active requests in the exiting process have |
| <code class="directive"><a href="../mod/core.html#timeout">TimeOut</a></code> seconds to finish before |
| processing is aborted. Alternate types of restart and shutdown are not |
| implemented.</li> |
| |
| <li>New child processes read the configuration files instead of |
| inheriting the configuration from the parent. The behavior will |
| be the same as on Unix if the child process is created at startup |
| or restart, but if a child process is created because the prior |
| one crashed or reached |
| <code class="directive"><a href="../mod/mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></code>, |
| any pending changes to the configuration will become active in the |
| child at that point, and the parent and child will be using a |
| different configuration. If planned configuration changes have been |
| partially implemented and the current configuration cannot be |
| parsed, the replacement child process cannot start up and the server |
| will halt. Because of this behavior, configuration files should not |
| be changed until the time of a server restart.</li> |
| |
| <li>The <code>monitor</code> and <code>fatal_exception</code> hooks |
| are not currently implemented.</li> |
| |
| <li><code class="directive">AcceptFilter</code> is implemented in the MPM |
| and has a different type of control over handling of new connections. |
| (Refer to the <code class="directive"><a href="../mod/core.html#acceptfilter">AcceptFilter</a></code> |
| documentation for details.)</li> |
| </ul> |
| |
| </div> |
| <div id="quickview"><h3 class="directives">Directives</h3> |
| <ul id="toc"> |
| <li><img alt="" src="../images/right.gif" /> <a href="core.html#acceptfilter">AcceptFilter</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listen">Listen</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listenbacklog">ListenBacklog</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxmemfree">MaxMemFree</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#pidfile">PidFile</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#receivebuffersize">ReceiveBufferSize</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadlimit">ThreadLimit</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadsperchild">ThreadsPerChild</a></li> |
| <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadstacksize">ThreadStackSize</a></li> |
| </ul> |
| <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> |
| <ul class="seealso"> |
| <li><a href="../platform/windows.html">Using Apache HTTP Server on Microsoft Windows</a></li> |
| <li><a href="#comments_section">Comments</a></li></ul></div> |
| |
| </div> |
| <div class="bottomlang"> |
| <p><span>Available Languages: </span><a href="../de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | |
| <a href="../en/mod/mpm_winnt.html" title="English"> en </a> | |
| <a href="../fr/mod/mpm_winnt.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | |
| <a href="../ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p> |
| </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 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 Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div> |
| <script type="text/javascript"><!--//--><![CDATA[//><!-- |
| var comments_shortname = 'httpd'; |
| var comments_identifier = 'http://httpd.apache.org/docs/trunk/mod/mpm_winnt.html'; |
| (function(w, d) { |
| if (w.location.hostname.toLowerCase() == "httpd.apache.org") { |
| d.write('<div id="comments_thread"><\/div>'); |
| var s = d.createElement('script'); |
| s.type = 'text/javascript'; |
| s.async = true; |
| s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier; |
| (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s); |
| } |
| else { |
| d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>'); |
| } |
| })(window, document); |
| //--><!]]></script></div><div id="footer"> |
| <p class="apache">Copyright 2025 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> |
| <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[//><!-- |
| if (typeof(prettyPrint) !== 'undefined') { |
| prettyPrint(); |
| } |
| //--><!]]></script> |
| </body></html> |
