Reset the pointer to ap_logio_get_last_bytes each time we create or reinit an
  existing scoreboard to avoid using an invalid pointer in case mod_logio got
  reloaded to a different address.

Reviewed by: rjung, trawick


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util_mutex.c: In function ‘ap_set_mutex’:
util_mutex.c:188: warning: comparison between pointer and integer
util_mutex.c:174: warning: unused variable ‘type’


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mod_auth_digest.c: In function ‘set_shmem_size’:
mod_auth_digest.c:681: warning: format ‘%ld’ expects type ‘long int’, but argument 7 has type ‘apr_size_t’


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addition of the parent pid to the generated lock file
name.

Change the Mutex directive syntax from

  Mutex default|mutex-name mechanism

to

  Mutex mechanism [default|mutex-name] ... [OmitPID]

as suggested by wrowe.  (Thanks!)



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only build mod_serf if we have zlib.


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with Fedora. Remove the use of the apachectl script, as a script calling
another script makes no sense. Test for the pidfile specifically, so
that Redhat's scripts don't fall back to using pidof and returning the
status of other httpd processes running on the same box.


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tree. We don't actually want to encourage people to use mod_rewrite for
this anyways.


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backreference. This technique is far simpler, and far easier to explain
to beginners than the unnecessarily complicated technique used.


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initially thought. No wonder people are confused about this topic.


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from the example itself. Will eventually remove duplication between this
doc and the rewrite/vhosts.xml doc.


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update the session cache description to indicate that the ssl cache mutex is used
to serialize access, and that the mutex can be configured using the Mutex directive


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performance tuning guide and into the common Mutex documentation; remove the
other (duplicate) information from that guide and instead point to the Mutex
directive

mpm_common: axe docs for old accept mutex directives

worker and prefork: axe links to old accept mutex directives, mention the use
of the accept mutex and how it can be configured

event: axe links to old mutex directives where were already N/A

mod_rewrite: axe old RewriteLock directive, mention use of the rewrite map
mutex for RewriteMap programs and how it can be configured

fix other miscellaneous LockFile or AcceptMutex references


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internal function ap_set_mutex() should be AP_DECLARE_NONSTD()
like our other directive parsers


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DEFAULT_REL_RUNTIMEDIR defined only in mpm_default.h for 
NetWare and dsp-based Win32 builds

mpm_default.h not in normal include path on Unix

thus, hardcode "logs" directory when DEFAULT_REL_RUNTIMEDIR
isn't defined

(file-based mutexes aren't configurable for those platforms anyway)


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(on Win32, external APIs use one calling convention while directive 
parsers use a different one)


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documentation of the old LockFile, AcceptMutex, RewriteLock, and SSLMutex directives


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