Constant libc::THREAD_PRECEDENCE_POLICY_COUNT

pub const THREAD_PRECEDENCE_POLICY_COUNT: mach_msg_type_number_t = (::mem::size_of::<thread_precedence_policy_data_t>() / ::mem::size_of::<integer_t>())
            as mach_msg_type_number_t; // 0x0000_0001u32