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  10 <title>mpm_winnt - Apache HTTP Server Version 2.5</title>
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  21 <p class="apache">Apache HTTP Server Version 2.5</p>
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  25 <a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.5</a> &gt; <a href="./">Modules</a></div>
  26 <div id="page-content">
  27 <div id="preamble"><h1>Apache MPM winnt</h1>
  28 <div class="toplang">
  29 <p><span>Available Languages: </span><a href="../de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
  30 <a href="../en/mod/mpm_winnt.html" title="English">&nbsp;en&nbsp;</a> |
  31 <a href="../fr/mod/mpm_winnt.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
  32 <a href="../ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a></p>
  33 </div>
  34 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Multi-Processing Module optimized for Windows NT.</td></tr>
  35 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr>
  36 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>mpm_winnt_module</td></tr>
  37 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mpm_winnt.c</td></tr></table>
  38 <h3>Summary</h3>
  39
  40     <p>This Multi-Processing Module (MPM) is the default for the
  41     Windows NT operating systems. It uses a single control process
  42     which launches a single child process which in turn creates
  43     threads to handle requests</p>
  44
  45     <p>Capacity is configured using the
  46     <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> directive,
  47     which sets the maximum number of concurrent client connections.</p>
  48
  49     <p>By default, this MPM uses advanced Windows APIs for accepting
  50     new client connections.  In some configurations, third-party products
  51     may interfere with this implementation, with the following messages
  52     written to the web server log:</p>
  53
  54     <div class="example"><p><code>
  55         Child: Encountered too many AcceptEx faults accepting client connections.<br />
  56         winnt_mpm: falling back to 'AcceptFilter none'.
  57     </code></p></div>
  58
  59     <p>The MPM falls back to a safer implementation, but some client requests
  60     were not processed correctly.  In order to avoid this error, use
  61     <code class="directive"><a href="../mod/core.html#acceptfilter">AcceptFilter</a></code> with accept filter
  62     <code>none</code>.</p>
  63
  64     <pre class="prettyprint lang-config">AcceptFilter http none
  65 AcceptFilter https none</pre>
  66
  67
  68     <p><em>In Apache httpd 2.0 and 2.2,
  69     <code class="directive">Win32DisableAcceptEx</code> was used for this purpose.</em></p>
  70
  71     <p>The WinNT MPM differs from the Unix MPMs such as worker and event
  72     in several areas:</p>
  73
  74     <ul>
  75       <li>When a child process is exiting due to shutdown, restart, or
  76       <code class="directive"><a href="../mod/mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></code>,
  77       active requests in the exiting process have
  78       <code class="directive"><a href="../mod/core.html#timeout">TimeOut</a></code> seconds to finish before
  79       processing is aborted.  Alternate types of restart and shutdown are not
  80       implemented.</li>
  81
  82       <li>New child processes read the configuration files instead of
  83       inheriting the configuration from the parent.  The behavior will
  84       be the same as on Unix if the child process is created at startup
  85       or restart, but if a child process is created because the prior
  86       one crashed or reached
  87       <code class="directive"><a href="../mod/mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></code>,
  88       any pending changes to the configuration will become active in the
  89       child at that point, and the parent and child will be using a
  90       different configuration.  If planned configuration changes have been
  91       partially implemented and the current configuration cannot be
  92       parsed, the replacement child process cannot start up and the server
  93       will halt.  Because of this behavior, configuration files should not
  94       be changed until the time of a server restart.</li>
  95
  96       <li>The <code>monitor</code> and <code>fatal_exception</code> hooks
  97       are not currently implemented.</li>
  98
  99       <li><code class="directive">AcceptFilter</code> is implemented in the MPM
 100       and has a different type of control over handling of new connections.
 101       (Refer to the <code class="directive"><a href="../mod/core.html#acceptfilter">AcceptFilter</a></code>
 102       documentation for details.)</li>
 103     </ul>
 104
 105 </div>
 106 <div id="quickview"><h3 class="directives">Directives</h3>
 107 <ul id="toc">
 108 <li><img alt="" src="../images/right.gif" /> <a href="core.html#acceptfilter">AcceptFilter</a></li>
 109 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li>
 110 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listen">Listen</a></li>
 111 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listenbacklog">ListenBacklog</a></li>
 112 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxconnectionsperchild">MaxConnectionsPerChild</a></li>
 113 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxmemfree">MaxMemFree</a></li>
 114 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#pidfile">PidFile</a></li>
 115 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#receivebuffersize">ReceiveBufferSize</a></li>
 116 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li>
 117 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li>
 118 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadlimit">ThreadLimit</a></li>
 119 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadsperchild">ThreadsPerChild</a></li>
 120 <li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#threadstacksize">ThreadStackSize</a></li>
 121 </ul>
 122 <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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mpm_winnt">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mpm_winnt">Report a bug</a></li></ul><h3>See also</h3>
 123 <ul class="seealso">
 124 <li><a href="../platform/windows.html">Using Apache HTTP Server on Microsoft Windows</a></li>
 125 <li><a href="#comments_section">Comments</a></li></ul></div>
 126
 127 </div>
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 129 <p><span>Available Languages: </span><a href="../de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
 130 <a href="../en/mod/mpm_winnt.html" title="English">&nbsp;en&nbsp;</a> |
 131 <a href="../fr/mod/mpm_winnt.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
 132 <a href="../ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a></p>
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