_lwp_cond_wait
(void) _lwp_cond_wait(&dlmp->rt_cv, (mutex_t *)&dlmp->rt_lock);
int _lwp_cond_wait(lwp_cond_t *, lwp_mutex_t *);
int _lwp_cond_wait(lwp_cond_t *, lwp_mutex_t *);
err = _lwp_cond_wait(cv, &mp->m_lock);