Real mutexes for sparc64.  Some comments from henric@ and claudio@. Tested by fkr@, claudio@, nick@.
Real mutexes for sparc64.  Some comments from henric@ and claudio@.
Tested by fkr@, claudio@, nick@.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars