* process.c (rb_clock_getres): New method.
  (timetick2dblnum_reciprocal): New function.

* configure.in: Check clock_getres.

[ruby-core:56780] [Feature #8809] accepted at
DevelopersMeeting20130831Japan
https://bugs.ruby-lang.org/projects/ruby/wiki/DevelopersMeeting20130831Japan



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42744 b2dd03c8-39d4-4d8f-98ff-823fe69b080e