SPCSTATUS_FREE
if (spc->spc_istatus == SPCSTATUS_FREE) {
spc->spc_istatus = SPCSTATUS_FREE;
while (spc->spc_ostatus != SPCSTATUS_FREE) {
while (clispc.spc_istatus != SPCSTATUS_FREE) {
clispc.spc_istatus = SPCSTATUS_FREE;
while (spc->spc_ostatus != SPCSTATUS_FREE) {
spc->spc_ostatus = SPCSTATUS_FREE;