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@22011 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
library. This should result in failure as of now with
ext/thread; submitted by: Sylvain Joyeux <sylvain.joyeux AT
m4x.org> in [ruby-core:10598].
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