K 10 svn:author V 7 davidxu K 8 svn:date V 27 2010-11-15T03:13:36.277274Z K 7 svn:log V 230 Sort priority-mutex in descending order of mutex priority ceiiling, the reason is most program will lock and unlock mutex in reversed order, by sorting in descending order, time to look up a mutex in the list is less then before. END