MUTEX_WAITERS
casip(&(lp)->m_owner, old, old | MUTEX_WAITERS) != old) \
#define MUTEX_HAS_WAITERS(lp) ((lp)->m_owner & MUTEX_WAITERS)
casip(&(lp)->m_owner, old, old | MUTEX_WAITERS) != old) \
#define MUTEX_HAS_WAITERS(lp) ((lp)->m_owner & MUTEX_WAITERS)