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<title>mpm_winnt - Apache HTTP Server Version 2.4</title>
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Modules | Directives | FAQ | Glossary | Sitemap
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Apache HTTP Server Version 2.4
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Apache > HTTP Server > Documentation > Version 2.4 > Modules
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Apache MPM winnt
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Available Languages: de |
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en |
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fr |
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| Description: | Multi-Processing Module optimized for Windows NT. |
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Status:MPM
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Module Identifier:mpm_winnt_module
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Source File:mpm_winnt.c
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Summary
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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
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Capacity is configured using the
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ThreadsPerChild directive,
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which sets the maximum number of concurrent client connections.
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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:
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Child: Encountered too many AcceptEx faults accepting client connections.
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winnt_mpm: falling back to 'AcceptFilter none'.
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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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AcceptFilter with accept filter
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none.
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AcceptFilter http none
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AcceptFilter https none
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In Apache httpd 2.0 and 2.2,
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Win32DisableAcceptEx was used for this purpose.
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The WinNT MPM differs from the Unix MPMs such as worker and event
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in several areas:
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When a child process is exiting due to shutdown, restart, or
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MaxConnectionsPerChild,
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active requests in the exiting process have
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TimeOut seconds to finish before
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processing is aborted. Alternate types of restart and shutdown are not
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implemented.
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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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MaxConnectionsPerChild,
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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.
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The monitor and fatal_exception hooks
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are not currently implemented.
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AcceptFilter 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 AcceptFilter
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documentation for details.)
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![Support Apache!]() Directives
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 AcceptFilter
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CoreDumpDirectory
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Listen
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ListenBacklog
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MaxConnectionsPerChild
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MaxMemFree
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PidFile
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ReceiveBufferSize
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ScoreBoardFile
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SendBufferSize
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ThreadLimit
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ThreadsPerChild
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ThreadStackSize
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Bugfix checklistSee also
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Using Apache HTTP Server on Microsoft Windows
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Comments
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Available Languages: de |
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en |
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fr |
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ja
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Notice: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 mailing lists.
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