* ext/thread/thread.c (rb_queue_pop, rb_queue_push): should not lock
	  mutex if got an exception while waiting, and should ensure unlocked
	  after signaled.  [ruby-dev:37545]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@23049 b2dd03c8-39d4-4d8f-98ff-823fe69b080e