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   8 <title>mpm_winnt - Apache HTTP Server</title>
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  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">&nbsp;de&nbsp;</a> |
  28 <a href="../en/mod/mpm_winnt.html" title="English">&nbsp;en&nbsp;</a> |
  29 <a href="../ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a></p>
  30 </div>
  31 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Multi-Processing Module optimized for Windows NT.</td></tr>
  32 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr>
  33 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>mpm_winnt_module</td></tr>
  34 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mpm_winnt.c</td></tr></table>
  35 <h3>Summary</h3>
  36
  37     <p>This Multi-Processing Module (MPM) is the default for the
  38     Windows NT operating systems. It uses a single control process
  39     which launches a single child process which in turn creates
  40     threads to handle requests</p>
  41
  42     <p>Capacity is configured using the
  43     <code class="directive"><a href="../mod/mpm_common.html#threadsperchild">ThreadsPerChild</a></code> directive,
  44     which sets the maximum number of concurrent client connections.</p>
  45
  46     <p>By default, this MPM uses advanced Windows APIs for accepting
  47     new client connections.  In some configurations, third-party products
  48     may interfere with this implementation, with the following messages
  49     written to the web server log:</p>
  50
  51     <div class="example"><p><code>
  52         Child: Encountered too many AcceptEx faults accepting client connections.<br />
  53         winnt_mpm: falling back to 'AcceptFilter none'.
  54     </code></p></div>
  55
  56     <p>The MPM falls back to a safer implementation, but some client requests
  57     were not processed correctly.  In order to avoid this error, use
  58     <code class="directive"><a href="../mod/core.html#acceptfilter">AcceptFilter</a></code> with accept filter
  59     <code>none</code>.</p>
  60
  61     <div class="example"><p><code>
  62         AcceptFilter http none
  63         AcceptFilter https 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
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 127 <p><span>Available Languages: </span><a href="../de/mod/mpm_winnt.html" hreflang="de" rel="alternate" title="Deutsch">&nbsp;de&nbsp;</a> |
 128 <a href="../en/mod/mpm_winnt.html" title="English">&nbsp;en&nbsp;</a> |
 129 <a href="../ja/mod/mpm_winnt.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a></p>
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