USEM_COUNT
*sval = (int)USEM_COUNT(sem->_kern._count);
while (USEM_COUNT(val = sem->_kern._count) > 0) {
while (USEM_COUNT(val = sem->_kern._count) > 0) {
if (USEM_COUNT(count) + 1 > SEM_VALUE_MAX) {
if (USEM_COUNT(count) != 0) {