git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27370 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
code that kicks waiting thread twice, which caused race and deadlock. [ruby-core:25537] * test/thread/test_queue.rb: added. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27356 b2dd03c8-39d4-4d8f-98ff-823fe69b080e