MUTEX_SPINBIT_LOCKED_P
#ifndef MUTEX_SPINBIT_LOCKED_P
MUTEX_ASSERT(mtx, !MUTEX_SPINBIT_LOCKED_P(mtx));
while (MUTEX_SPINBIT_LOCKED_P(mtx)) {
if (__predict_false(!MUTEX_SPINBIT_LOCKED_P(mtx))) {
return MUTEX_SPINBIT_LOCKED_P(mtx);
while (MUTEX_SPINBIT_LOCKED_P(mtx)) {