Delegate MonitorMixin#synchronize body to Monitor#synchronize.
It makes guarantee interrupt safe (because Monitor#synchronize is
written in C). I thought Ruby implementation is also safe, but I
got stuck failure http://ci.rvm.jp/results/trunk_test@P895/2327639
so that I introduce this fix to guarantee interrupt safe.
delegate synchronize method
Delegate MonitorMixin#synchronize body to Monitor#synchronize.
It makes guarantee interrupt safe (because Monitor#synchronize is
written in C). I thought Ruby implementation is also safe, but I
got stuck failure http://ci.rvm.jp/results/trunk_test@P895/2327639
so that I introduce this fix to guarantee interrupt safe.