unsigned n_used;
};
-struct pool *first_hashmap_pool = NULL;
+static struct pool *first_hashmap_pool = NULL;
static void *first_hashmap_tile = NULL;
-struct pool *first_entry_pool = NULL;
+static struct pool *first_entry_pool = NULL;
static void *first_entry_tile = NULL;
static void* allocate_tile(struct pool **first_pool, void **first_tile, size_t tile_size) {