RSMIPC_PENDING
if (RSMIPC_GET(slot, RSMIPC_PENDING)) {
RSMIPC_CLEAR(slot, RSMIPC_PENDING);
RSMIPC_SET(rslot, RSMIPC_PENDING);
while (RSMIPC_GET(rslot, RSMIPC_PENDING)) {
RSMIPC_CLEAR(rslot, RSMIPC_PENDING);
RSMIPC_CLEAR(rslot, RSMIPC_PENDING);
RSMIPC_CLEAR(rslot, RSMIPC_PENDING);
RSMIPC_CLEAR(rslot, RSMIPC_PENDING);