git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30031 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r29415 from trunk into ruby_1_9_2.¶
already in finalization phase, as the order of finalizers is not
guaranteed. rb_mutex_t should be used in place of Mutex object
in the future.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30031 b2dd03c8-39d4-4d8f-98ff-823fe69b080e