MUTEX_DEAD
(lp)->m_owner = ((uintptr_t)curthread | MUTEX_DEAD)
#define MUTEX_TYPE_ADAPTIVE(lp) (((lp)->m_owner & MUTEX_DEAD) == 0)
#define MUTEX_TYPE_ADAPTIVE(lp) (((lp)->m_owner & MUTEX_DEAD) == 0)
(lp)->m_owner = ((uintptr_t)curthread | MUTEX_DEAD)