atomic_readandclear_int
#define atomic_readandclear_int(p) atomic_swap_int(p, 0)
#define atomic_readandclear_int atomic_readandclear_32
#define atomic_readandclear_int atomic_readandclear_32
#define atomic_readandclear_int(p) atomic_swap_int(p, 0)
atomic_readandclear_int(volatile u_int *addr)
#define atomic_readandclear_int atomic_readandclear_32
#define atomic_readandclear_int ATOMIC_SAN(readandclear_int)