thread.c: refine enums
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49766 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread.c: refine enums
of enumerations.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49766 b2dd03c8-39d4-4d8f-98ff-823fe69b080e