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and use/handle POLLOUT where needed to avoid busy IOs and recover write
errors when appropriate.



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read was incomplete (the SSL case can cause the next poll() to timeout
since data are buffered already).  PR 61301



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  The index tells us the size of the node in 4096 byte pages minus 1.
  Hence we need to multiply back with 4096 aka << 12 (plus adding the
  missing page).


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Proposed by: Bernard Spil <brnrd freebsd.org>
Reviewed by: ylavic


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  - dump_all_pools: Dump the whole pool hierarchy starting from apr_global_pool.
                    Requires an arbitrary pool as starting parameter.
  - dump_pool_and_childs: Dump the whole pool hierarchy starting from
                          the given pool.

  dump_pool_and_childs is written in Python using the GDB Python API
  as doing recursive stuff in standard GDB macros is very difficult.


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Update docs' BNF, provide a short description of the new %{::} syntax and
a few examples. To be continued..



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Generated parser files.


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The "split" and "join" operators are now a prefix, ala perl.
Add the "sub" operator for string substitutions, prefix still.



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mod_md: v0.9.9, fix for applying challenge type based on available ports. 



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Better token/type descriptors for better parsing error messages.



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Silence "-Wunknown-pragmas" on GCC...


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Not necessarily ASCII here..



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Introduces the syntax "%{:<word>:}", borrowed from the <var>'s one which is
"%{<var_name>[:<var_function_args>]}" and already allowed in string expressions
and which likewise can be embedded anywhere in a string expression (the same
reserved character ':' gets reused in an unambiguous manner).

This allows the two types of expressions (boolean and string) to now share
fully the same language set, namely: strings, lists, vars, regexes, backrefs,
functions with multiple or complex arguments, and especially combinations
thereof.

Most of them were reserved to boolean expressions only, while complex string
constructions can also benefit to, well, strings. The <word> construct allows
that (say the syntax "%{:<word>:}" looks like a temporary variable constructed
in a string).

Since string expressions may now have to deal with lists (arrays), they also
need a way to produce/extract strings from list and vice versa. This can be
done with the new "join" and "split" operators, while the new substitution
regexes (like "s/<pattern>/<substitute>/<flags>") may be used to manipulate
strings in place. All this of course available for both string and boolean
expressions.

Tests and doc updates upcoming..



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https://github.com/unbit/uwsgi/issues/1636



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Fix for PR 61540.


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