CX18_F_S_STOPPING
clear_bit(CX18_F_S_STOPPING, &s->s_flags);
test_bit(CX18_F_S_STOPPING, &s->s_flags) ||
set_bit(CX18_F_S_STOPPING, &s->s_flags);
clear_bit(CX18_F_S_STOPPING, &s->s_flags);
set_bit(CX18_F_S_STOPPING, &s->s_flags);