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[Daniel Axtens <dja@xxxxxxxxxx>]

Public bug reported:

The default Mutex implementation used by Ubuntu's Apache package is file
locking. (See /etc/apache2/apache2.conf) This is slower than pthreads,
especially when using mpm_prefork.

The Apache project currently warns about pthreads being potentially
dangerous.[1] However, Linux has supported robust pthreads for many
years now,[2] so it's safe for Ubuntu to move to pthreads and reap the
performance benefits.

My tests on POWER8, VM and bare-metal, PHP and static files, show
something like a 1.5% to 3.5% performance gain for a one-line config
change.

[1] https://httpd.apache.org/docs/trunk/mod/core.html#mutex
[2] See this apache bug: https://bz.apache.org/bugzilla/show_bug.cgi?id=58744

** Affects: apache2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1527044

Title:
  Update mutex from file to pthread

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