will not be building from source.


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

Suggested by Yann Ylavic on the dev@ mailing list.



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Use 'ap_array_str_contains()' instead of 'ctutil_in_array()'

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Fishy "unlink semantic" (description) does not apply anymore.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1823572 13f79535-47bb-0310-9956-ffa450edef68

Rework server_rec ID so that it doesn't change on restart (or stop/start)
unless it's Host(s)/IP(s):port(s), ServerName and/or ServerAlias(es) changed.

The goal being to reuse SHMs (and persisted files) names as much as possible,
with minimal bindings to configuration changes (as far as mod_proxy_balancer
is concerned). So if the ServerName and first Host/IP:port are unique we use
that first, otherwise the ServerAlias(es) and other Host(s)/IP(s):port(s) are
also taken into account, and finally if that's still not enough the server
index is also used (pathological case handled for correctness with regard to
the underlying mod_slotmem_shm's reuse code).



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Complete layout of SHM and persited file (ascii art).
Simplify an "if" condition, no functional change.



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Do not bind attached slotmems to the global list, they should be detached when
pconf is cleaned up, but not destroyed/removed (doubly) with pglobal.



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Check SHM sizes when reused, reload may have changed the needs.



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  older layout used in "RedHat".


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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.



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  static in optional fn pointer variable declaration.

* modules/ssl/ssl_engine_vars.c (ssl_var_log_config_register):
  Likewise.


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Fix my maths, thanks Stefan and Rüdiger!



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Does r1822878's "static" APR_RETRIEVE_OPTIONAL_FN work if, say, mod_proxy is
builtin but mod_http2 isn't?

Not worth taking the risk here since it's not a fast path...

Note: if this is an issue, I'm afraid it applies elsewhere too.



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Get the help(er) of mod_http2 to determine how much connections should
be handled in the reslist by default (i.e. max_threads).



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adding AP_DECLARE for ap_parse_vhost_addrs() and minor bumb mmn. Resolves
     building mod_ssl on Windows. 



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  has changed.


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  be useful as mod_http2 has an additional thread pool on top of
  ThreadsPerChild.
  But leave the default with ThreadsPerChild.


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All was already there, I just misread name vs sname :/



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Actually we already have an (per vhost) unique id for the balancer, so use it.



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Use a unique balancer id per vhost for workers' slotmem too.



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We can't dereference 'f' after EOR is destroyed either.



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mod_http2: removed obsolete stream detach code, no longer generating events
     in beam shutdown on pool destroy. 


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The core request filter is the only one which should take care of it.
In theory the other request filters should have bailed out on EOS already,
but that's not always the case (and even less the case on error).
So be safe by not sending them a bucket which may destroy the request (and
their brigade) underneath them.



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The filter should pass everything up to and including EOR, then bail out.
For EOR it can't use a brigade created on r->pool, so retain one created
on c->pool in c->notes (this avoids leaking a brigades for each request
on the same connection).



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We can destroy ap_pglobal in the MPMs because clean_child_exit() runs in
a DSO which would be unloaded under us.

So we defer an ap_terminate() with atexit() in ap_unixd_mpm_set_signals(),
all this is static/builtin code in "os/unix/unixd.c".



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When connection_destructor() is called when pconf is gone, we can't dereference
worker->cp anymore. This happens is one_process mode exit if we apr_terminate()
or destroy the process pool directly (APR_POOL_DEBUG is needed too).

Fix this by NULL-ing worker->cp in conn_pool_cleanup(), and by registering it
as a pre_cleanup.



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