THREAD_SLEEP
THREAD_SLEEP(curthread, &shuttle_lock);
THREAD_SLEEP(curthread, &shuttle_lock);
THREAD_SLEEP(t, &shuttle_lock);
THREAD_SLEEP(t, &sqh->sq_lock);
THREAD_SLEEP(curthread, lockp); \
THREAD_SLEEP(t, &tc->tc_lock);
THREAD_SLEEP(t, &sqh->sq_lock);