pool_init
#define pool_init(a, b, c, d, e, f, g) do { (a)->pr_size = (b); } while (0)
#define pool_init(a, b, c, d, e, f, g) do { (a)->pr_size = (b); } while (0)
pool_init(struct pool *pp, size_t size, u_int align, int ipl, int flags,
#define pool_init(pool, size, a, ao, f, m, p) (*(pool)) = (size)
pool_init(struct pool *pp, const char *name, size_t nmemb, size_t size)
#define pool_init(p, s, a1, a2, a3, a4, a5, a6) (p)->size = (s)