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so async MPMs can tell whether to keep polling and writing


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the httpd core) is responsible for write completion.

Note that, with this commit, the Event MPM is still doing write
completion synchronously.  I'll add async write completion as a
separate commit.

Note also that this commit breaks the (experimental) Leader/Followers
MPM on the (equally experimental) async-dev branch.  The fix is to add
either synchronous or asynchronous write completion to that MPM.  Rather
than hack in synchronous write completion, I'll revisit Leader/Followers
once I have async working in Event.


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Correct an out-of-date comment


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the logger.


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ap_core_output_filter()


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  - A new End-Of-Request bucket is pushed through the output filter
    chain after the last bucket of the response.
  - This bucket gets destroyed by ap_core_output_filter() after the
    buckets in front of it have been sent.
  - The destroy callback of the EOR bucket invokes the access logger
    and frees the request's pool.

With this change, the request logger now runs after the last byte of
the response is _sent_, rather than after the last byte of the response
is _generated_.  This should make the bytes-sent count in the access
log more accurate in cases where the client closes the connection
midway through the sending of the response.


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the async-dev branch


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the async-dev branch, in preparation for developing async write
completion in this branch on top of the new timeout design.
http://svn.apache.org/viewcvs.cgi?rev=306495&view=rev


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port the fix for PR35292 forward from the 2.3 trunk to the async-dev branch, because one of the perl-framework test cases now checks for this fix

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forward-port the latest versions of mod_ssl and mod_setenvif from the 2.3 trunk to the async-dev branch so t/TEST will work once again

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The big change is that it now does nonblocking writes when possible.  The
goal of this redesign is to more cleanly support asynchronous write completion
in MPMs such as Event or Leader.  However, the nonblocking writes may also
help in Worker and Prefork by allowing more overlapping of handler and
output filter processing with network writes.


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interact with the async R&D, but I'm merging it into the async-dev branch
because there's now a test case specifically for this change in
httpd-test/perl-framework.)


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the new io_multiplexer object is intended to provide a
foundation for async processing of the other connection
states.


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Also, core_create_conn() now initializes the conn_state within the newly
created connection.


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*) Put an example of using it into the Event MPM, which just calls the original core output filter.  


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what verification is done by the proxy in the proxy-to-SSL-server
case.


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(1.3 has done that for a while)


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returned by X509_LOOKUP_add_dir or X509_LOOKUP_load_file to detect
malformed or misconfigured CRLs.  Clear error stack beforehand to
ensure reported errors are relevant.

PR: 36438


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variable at function-scope.


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Initiliase all of the first_*_limit variables to zero, so that we can actually
raise limits beyond their defaults reliably. 



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Revert one part. I should have tested seperately. This line isn't neccessary.



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Actually allow the admin to set thread_limit higher than the default. 

Also, initialise the first_ variables, since they are tested in the
set_ functions.



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a function I think, especially with the fact that
the mapping of getpid() to APR_PID_T_FMT isn't
consistant in some areas. 


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versions 1.2.0 or higher.


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broke all the -Werror builds.


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Make my PR references consistent with everyone elses.



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PR: 34264


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