PS_NOZOMBIE
atomic_setbits_int(&pr->ps_flags, PS_NOZOMBIE);
if ((pr->ps_flags & PS_NOZOMBIE) == 0)
if (pr->ps_flags & PS_NOZOMBIE) {
if ((pr->ps_flags & PS_NOZOMBIE) == 0) {
if ((pr->ps_flags & PS_NOZOMBIE) ||
if ((pr->ps_flags & PS_NOZOMBIE) ||
pr->ps_flags |= PS_NOZOMBIE;