NCF_WIP
ncp->nc_flag = flag | NCF_WIP;
atomic_store_char(&ncp->nc_flag, ncp->nc_flag & ~NCF_WIP);
__predict_true((_nc_flag & (NCF_INVALID | NCF_WIP)) == 0); \
__predict_true((_nc_flag & (NCF_INVALID | NCF_WIP | NCF_WHITE)) == 0); \