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mod_proxy_fcgi: Add the support for mod_proxy's
                flushpackets and flushwait params

This change was requested on the development mailing
list in order to fill another gap between mod_fcgi
and mod_proxy_fcgi, namely the -flush funtionality.

The more evolved core trunk code would not need this
feature becuse of the non-blocking writes, but it
is be needed in 2.4.x.


mod_proxy_fcgi: limit the flush buckets inserted when flushpackets=on|auto

This commit is a follow up of r1802040 based on Jacob's
feedback, namely inserting the FLUSH buckets only when
really needed and useful, not always.


mod_proxy_fcgi: follow up to r1807876.
Fix mixed declarations and code [-Wdeclaration-after-statement].

Fix a compilation warning introduced by r1802040.
mod_proxy_fcgi.c:893:19: warning: ‘flushpoll’ may be used uninitialized in this function [-Wmaybe-uninitialized]

This warning is a false positive.


mod_proxy_fcgi: prioritize the check for mayflush when using flushpackets

The mayflush variable should be checked before the rest
to avoid polling when not needed.

Suggested by Yann Ylavic on the dev@ mailing list.


Submitted by: elukey, ylavic, jailletc36, elukey
Reviewed by: elukey, jim, ylavic


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Propose backportable fix to accept libxml2 path in the
base form or the absolute path to include tree form.

Nowhere does the --with-libxml2= arg suggest the path
is that of the include tree, and disagrees with httpd's
use of --with- syntax for package location.



Submitted by: wrowe
Reviewed by: wrowe, ylavic, jim


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* modules/lua/config.m4: Use liblua paths from pkg-config if
  available.

Reviewed by: wrowe, ylavic, jorton


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Fix the version number in the docs to match the real release.


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rpm: Add mod_proxy_uwsgi to the RPM package.


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rpm: Remove rpm build for mod_socache_dc, the dependency distcache has long since
stopped being available in RPM distros.


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and correct LICENSE/NOTICE to match.



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These tags generate a "Not applicable" section in
docs/manual/mod/overrides.html that doesn't make a lot of
sense, plus it breaks ./build.sh validate-xhtml.



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mpm_event: move lingering close "sucker" from the listener to worker(s).

This was the last non-constant time action performed by the listener thread.

It's now handled by the worker thread directly after entering lingering close,
which should directly address the cases when the socket is already closed
remotely at that time, hence avoid more scheduling (it may be the common case
for some scenarios).

And it's only if the above would need blocking (i.e. more data to suck) that
the socket is added to the pollset for the listener to re-schedule a worker
later when ready. If no worker is available at that time then the socket is
forcibly closed (similarly to what's done for keepalive connections in this
case).

Also, since process_lingering_close() is now called by a worker thread and
with almost no depth in the call stack, we can grow the size of the "suck"
buffer from 2K to 32K to potentially call recv() up to sixteen ti...

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10 years after r567503 , fix this properly.

The lock is created in post_config, so we can't copy it
around in a merge_server_config() callback.


Submitted by: covener
Reviewed by: covener, rpluem, jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1824872 13f79535-47bb-0310-9956-ffa450edef68

Merged r1820464 from trunk.

elukey: mod_md update to current certifcate agreement URL.



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mpm_event: move lingering close "sucker" from the listener to worker(s).

This was the last non-constant time action performed by the listener thread.

It's now handled by the worker thread directly after entering lingering close,
which should directly address the cases when the socket is already closed
remotely at that time, hence avoid more scheduling (it may be the common case
for some scenarios).

And it's only if the above would need blocking (i.e. more data to suck) that
the socket is added to the pollset for the listener to re-schedule a worker
later when ready. If no worker is available at that time then the socket is
forcibly closed (similarly to what's done for keepalive connections in this
case).

Also, since process_lingering_close() is now called by a worker thread and
with almost no depth in the call stack, we can grow the size of the "suck"
buffer from 2K to 32K to potentially call recv() up to sixteen times less.


mpm_event: follow up to r1823047.

Update clogged counter on read_request retry too.


mpm_event: follow up to r1823047: simplify "clogging" logic (reentrance).


mpm_event: follow up to r1823047: complete state validation after processing.


mpm_event: follow up to r1823047: CHANGES entry.


mpm_event: follow up to r1823047 and r1824464.

MMN bump for CONN_STATE_NUM, plus don't consider CONN_STATE_LINGER_* as valid
states returned process_connection (never have been).


Submitted by: ylavic
Reviewed by: ylavic, minfrin, jim


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Merge r1821624, r1821625, r1821626, r1821627, r1821629, r1821632, r1821635, r1821639, r1821644, r1821647, r1821648, r1821649, r1821650, r1821651, r1821659, r1821660, r1822366, r1822367, r1824381 from trunk:

Shared fdqueue code between MPMs event and worker into mpm_fdqueue.

This first step moves the files server/mpm/event/fdqueue.[ch] to
server/mpm_fdqueue.[ch] (untouched for now, simple svn move).

Will follow up with the necessary changes to mpm_unix.* for common code.


mpm_fdqueue: follow up to r1821624.

And now it's mpm_fdqueue, with minimal #includes.


mpm_fdqueue: follow up to r1821624.

Opacify fdqueue types.


mpm_fdqueue: follow up to r1821624.

Style, no functional change.


mpm_fdqueue: follow up to r1821624.

Rename ap_queue_info_get_idlers() to ap_queue_info_num_idlers().


mpm_fdqueue: follow up to r1821624.

Clear recycled_pools_count in ap_free_idle_pools().


mpm_fdqueue: follow up to r1821624.

Prepare mpm_worker to use common fdqueue.


mpm_worker: follow up to r1821624.

Use common [mpm_]fdqueue.


mpm_fdqueue: follow up to r1821624.

The implemention wants APR_HAS_THREADS too.


mpm_fdqueue: follow up to r1821624.

The code is not part of the API.


mpm_fdqueue: follow up to r1821624.

Fix typo in comment.


mpm_fdqueue: follow up to r1821624.

Cosmetics, 80 cols, no functional change.


mpm_worker: follow up to r1821624.

Free idle pools while stopping.


mpm_fdqueue: follow up to r1821624.

Be explicit in the naming about what's push/pop-ed.


mpm_fdqueue: follow up to r1821624.

Either error matters, simplify code.


mpm_fdqueue: follow up to r1821624.

Make the allocation and zero-ing in ap_queue_init() => ap_queue_create().


mpm_fdqueue: follow up to r1821624.

Export ap_queue_*() fonctions, so that they are accessible from MPMs, but
don't provide "mpm_fdqueue.h" in the API (include/).


mpm_fdqueue: follow up to r1821624.

80 colums.


Follow up to r1821624: CHANGES entry.


Submitted by: ylavic
Reviewed by: ylavic, minfrin, jim


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