VRSF_REQ_START
ring->vr_state_flags |= VRSF_REQ_START;
return ((ring->vr_state_flags & VRSF_REQ_START) != 0);
ring->vr_state_flags &= ~VRSF_REQ_START;
ASSERT((ring->vr_state_flags & VRSF_REQ_START) != 0);
ring->vr_state_flags &= ~VRSF_REQ_START;