_mutex_cv_lock
error2 = _mutex_cv_lock(mp, recurse, true);
error2 = _mutex_cv_lock(mp, recurse, true);
error2 = _mutex_cv_lock(mp, recurse, false);
error2 = _mutex_cv_lock(mp, recurse, false);
int _mutex_cv_lock(struct pthread_mutex *, int, bool) __hidden;