BIGCACHE
#define BIGCACHE_MASK (BIGCACHE - 1)
static volatile void *bigcache_array[BIGCACHE]; /* atomic swap */
static volatile size_t bigcache_size_array[BIGCACHE]; /* SMP races ok */
for (i = 0; i < BIGCACHE; ++i) {
for (i = 0; i < BIGCACHE; ++i) {