1<?xml version="1.0" encoding="ISO-8859-1"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- 4 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 5 This file is generated from xml source: DO NOT EDIT 6 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 7 --> 8<title>mpm_winnt - Apache HTTP Server</title> 9<link href="/style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> 10<link href="/style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> 11<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" /> 12<script src="/style/scripts/prettify.min.js" type="text/javascript"> 13</script> 14 15<link href="/images/favicon.ico" rel="shortcut icon" /></head> 16<body> 17<div id="page-header"> 18<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.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> 19<p class="apache">Apache HTTP Server Version 2.4</p> 20<img alt="" src="/images/feather.gif" /></div> 21<div class="up"><a href="./"><img title="<-" alt="<-" src="/images/left.gif" /></a></div> 22<div id="path"> 23<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 2.4</a> > <a href="./">Modules</a></div> 24<div id="page-content"> 25<div id="preamble"><h1>Apache MPM winnt</h1> 26<div class="toplang"> 27<p><span>Available Languages: </span><a href="/de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | 28<a href="/en/mod/mpm_winnt.html" title="English"> en </a> | 29<a href="/fr/mod/mpm_winnt.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a> | 30<a href="/ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p> 31</div> 32<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Multi-Processing Module optimized for Windows NT.</td></tr> 33<tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr> 34<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>mpm_winnt_module</td></tr> 35<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mpm_winnt.c</td></tr></table> 36<h3>Summary</h3> 37 38 <p>This Multi-Processing Module (MPM) is the default for the 39 Windows NT operating systems. It uses a single control process 40 which launches a single child process which in turn creates 41 threads to handle requests</p> 42 43 <p>Capacity is configured using the 44 <code class="directive"><a href="/mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> directive, 45 which sets the maximum number of concurrent client connections.</p> 46 47 <p>By default, this MPM uses advanced Windows APIs for accepting 48 new client connections. In some configurations, third-party products 49 may interfere with this implementation, with the following messages 50 written to the web server log:</p> 51 52 <div class="example"><p><code> 53 Child: Encountered too many AcceptEx faults accepting client connections.<br /> 54 winnt_mpm: falling back to 'AcceptFilter none'. 55 </code></p></div> 56 57 <p>The MPM falls back to a safer implementation, but some client requests 58 were not processed correctly. In order to avoid this error, use 59 <code class="directive"><a href="/mod/core.html#acceptfilter">AcceptFilter</a></code> with accept filter 60 <code>none</code>.</p> 61 62 <div class="example"><p><code> 63 AcceptFilter none 64 </code></p></div> 65 66 <p><em>In Apache httpd 2.0 and 2.2, 67 <code class="directive">Win32DisableAcceptEx</code> was used for this purpose.</em></p> 68 69 <p>The WinNT MPM differs from the Unix MPMs such as worker and event 70 in several areas:</p> 71 72 <ul> 73 <li>When a child process is exiting due to shutdown, restart, or 74 <code class="directive"><a href="/mod/mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></code>, 75 active requests in the exiting process have 76 <code class="directive"><a href="/mod/core.html#timeout">TimeOut</a></code> seconds to finish before 77 processing is aborted. Alternate types of restart and shutdown are not 78 implemented.</li> 79 80 <li>New child processes read the configuration files instead of 81 inheriting the configuration from the parent. The behavior will 82 be the same as on Unix if the child process is created at startup 83 or restart, but if a child process is created because the prior 84 one crashed or reached 85 <code class="directive"><a href="/mod/mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></code>, 86 any pending changes to the configuration will become active in the 87 child at that point, and the parent and child will be using a 88 different configuration. If planned configuration changes have been 89 partially implemented and the current configuration cannot be 90 parsed, the replacement child process cannot start up and the server 91 will halt. Because of this behavior, configuration files should not 92 be changed until the time of a server restart.</li> 93 94 <li>The <code>monitor</code> and <code>fatal_exception</code> hooks 95 are not currently implemented.</li> 96 97 <li><code class="directive">AcceptFilter</code> is implemented in the MPM 98 and has a different type of control over handling of new connections. 99 (Refer to the <code class="directive"><a href="/mod/core.html#acceptfilter">AcceptFilter</a></code> 100 documentation for details.)</li> 101 </ul> 102 103</div> 104<div id="quickview"><h3 class="directives">Directives</h3> 105<ul id="toc"> 106<li><img alt="" src="/images/right.gif" /> <a href="core.html#acceptfilter">AcceptFilter</a></li> 107<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li> 108<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#listen">Listen</a></li> 109<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#listenbacklog">ListenBacklog</a></li> 110<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></li> 111<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#maxmemfree">MaxMemFree</a></li> 112<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#pidfile">PidFile</a></li> 113<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#receivebuffersize">ReceiveBufferSize</a></li> 114<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li> 115<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li> 116<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#threadlimit">ThreadLimit</a></li> 117<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#threadsperchild">ThreadsPerChild</a></li> 118<li><img alt="" src="/images/right.gif" /> <a href="mpm_common.html#threadstacksize">ThreadStackSize</a></li> 119</ul> 120<h3>See also</h3> 121<ul class="seealso"> 122<li><a href="/platform/windows.html">Using Apache HTTP Server on Microsoft Windows</a></li> 123</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div> 124 125</div> 126<div class="bottomlang"> 127<p><span>Available Languages: </span><a href="/de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | 128<a href="/en/mod/mpm_winnt.html" title="English"> en </a> | 129<a href="/fr/mod/mpm_winnt.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a> | 130<a href="/ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p> 131</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. 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