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Subject svn commit: r1514214 - /httpd/httpd/trunk/docs/manual/mod/event.xml
Date Thu, 15 Aug 2013 09:17:10 GMT
Author: sf
Date: Thu Aug 15 09:17:10 2013
New Revision: 1514214

Try to document the current behavior of MPM event with filters like mod_ssl,
mod_deflate, or mod_include


Modified: httpd/httpd/trunk/docs/manual/mod/event.xml
--- httpd/httpd/trunk/docs/manual/mod/event.xml (original)
+++ httpd/httpd/trunk/docs/manual/mod/event.xml Thu Aug 15 09:17:10 2013
@@ -66,6 +66,14 @@ of consuming threads only for connection
     <module>worker</module> MPM and reserve one worker thread per connection.
     All modules shipped with the server are compatible with the event MPM.</p>
+    <p>A similar restriction is currently present for requests involving an
+    output filter that needs to read and/or modify the whole response body,
+    like for example mod_ssl, mod_deflate, or mod_include. If the
+    connection to the client blocks while the filter is processing the
+    data, and the amount of data produced by the filter is too big to be
+    buffered in memory, the thread used for the request is not freed while
+    httpd waits until the pending data is sent to the client.</p>
     <p>The MPM assumes that the underlying <code>apr_pollset</code>
     implementation is reasonably threadsafe. This enables the MPM to
     avoid excessive high level locking, or having to wake up the listener

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