NTHREAD
pthread_t thread[NTHREAD];
struct batch b[NTHREAD];
uid_t idbuf[NTHREAD*BATCHSIZE];
for (i = 0; i < NTHREAD; i++) {
for (i = 0; i < NTHREAD; i++) {
if (n == NTHREAD) {
for (i = 0; i < NTHREAD; i++) {
for (i = 0; i < NTHREAD; i++) {
qsort(idbuf, NTHREAD*BATCHSIZE, sizeof (uid_t), cmpugid);
for (i = 1; i < NTHREAD*BATCHSIZE; i++) {