BLOCKIF_NUMTHR
for (i = 0; i < BLOCKIF_NUMTHR; i++)
pthread_t bc_btid[BLOCKIF_NUMTHR];
#define BLOCKIF_MAXREQ (BLOCKIF_RING_MAX + BLOCKIF_NUMTHR)
for (i = 0; i < BLOCKIF_NUMTHR; i++) {