XHSIZE
#define NXMID (XHSIZE*3/4) /* Max extra machines */
} xtrahash[XHSIZE];
static struct xtrahash *xtab[XHSIZE]; /* F: mid-->machine name */
for (xp = &xtrahash[0]; xp < &xtrahash[XHSIZE]; xp++) {
if (midfree >= XHSIZE) {
h = h % XHSIZE;
for (i = 0, q = 0; q < XHSIZE; i++, q = i * i) {
xp = &xtrahash[(h + q) % XHSIZE];
h += XHSIZE;
xp = &xtrahash[(h - q) % XHSIZE];