When listening sockets are disabled (too many connections) and the number of
workers / active connections comes back below the limit, we need to wake up
the listener to re-enable them.

Add a new connections_above_limit() helper to determine when this applies.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1819855 13f79535-47bb-0310-9956-ffa450edef68

mod_md v1.1.7 changes


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It's always updated under the timeout_mutex lock, or read for logging and
scoreboard updates (not critical).

For the read cases a volatile access is enough, while removing the atomic ops
for the already protected write cases saves cycles and context switches.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1819853 13f79535-47bb-0310-9956-ffa450edef68

Make sure the worker factor is at least one (w.r.t. WORKER_FACTOR_SCALE), and
use it to size the pollset appropriately (including K-A and lingering close
connections), in addition to the listening sockets.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1819852 13f79535-47bb-0310-9956-ffa450edef68

Even if the listener thread is not created yet (i.e. about to be), we must
still tell it to leave, and terminate the worker queue in any case.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1819848 13f79535-47bb-0310-9956-ffa450edef68

Make sure the compiler doesn't play games with our synchronization variables
by marking them volatile.



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xform


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Align mod_http2 with expected returned state from process_connection hooks in
async MPMs.
When the master connection is handled, enter CONN_STATE_LINGER in any case.



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Be more correct in comment about CONN_STATE_WRITE_COMPLETION.
We currently have/need no state to simply wait for readability on a socket,
so the previous comment was misleading. Write completion can't be used for
a simple "wait for read event and come back to process_connection hooks".



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Allow DONE as a successful ap_run_process_connection() return value, for
instance h2_conn_run() and h2_task_process_conn() uses it, third-party
modules may too...



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Align comment and fix typos.



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Address corner case where connection is aborted due to ap_run_pre_connection()
failure, and update comment about ap_run_process_connection() expected return
status and state.



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This avoids a transient replacement/restore of '?' by '\0' in r->filename.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1818924 13f79535-47bb-0310-9956-ffa450edef68

mod_md: fixed mem pool usage for auto-added server names. Added
     error logging of exact ACME response when challenges failed.



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Negate APLOGctrace7(c) test!

Also, return DECLINED when nothing is to be done, same result as OK but
possibly more semantically correct.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1818825 13f79535-47bb-0310-9956-ffa450edef68

This avoids losing track of them and leaking scoreboard entries.
PR 61551.



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For instance, depending on EnableMMAP/Sendfile configuration, don't split
file brigades to 8K heap buckets upon reading.



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mod_md: reverses most of v1.0.5 optimization of post_config init, so that
     mod_ssl can ask for certiticates without crashing.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1818792 13f79535-47bb-0310-9956-ffa450edef68

PR 61857.

Proposed by: Markus Gausling <markusgausling googlemail.com>
Reviewed by: ylavic



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