CALLOUT_ACTIVE
c->c_flags &= ~ CALLOUT_ACTIVE;
c->c_flags |= CALLOUT_ACTIVE;
((c->c_flags & CALLOUT_ACTIVE) == CALLOUT_ACTIVE)) {
c->c_flags &= ~CALLOUT_ACTIVE;
c->c_flags &= ~CALLOUT_ACTIVE;
c->c_flags &= ~CALLOUT_ACTIVE;
c->c_flags &= ~CALLOUT_ACTIVE;
c->c_flags |= CALLOUT_ACTIVE;
KASSERT((c->c_flags & CALLOUT_ACTIVE) == CALLOUT_ACTIVE,
#define callout_active(c) ((c)->c_flags & CALLOUT_ACTIVE)
#define callout_deactivate(c) ((c)->c_flags &= ~CALLOUT_ACTIVE)