* 2013-03-20

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39827 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* thread.c (ruby_kill): added a few comments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39828 b2dd03c8-39d4-4d8f-98ff-823fe69b080e