Use the Mutex to know whether we entered the signal handler in Process#kill specs
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58651 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Use the Mutex to know whether we entered the signal handler in Process#kill specs
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58651 b2dd03c8-39d4-4d8f-98ff-823fe69b080e