CPUCLOCK_BIT
if ((clock_id & CPUCLOCK_BIT) == 0)
if ((clock_id & CPUCLOCK_BIT) == CPUCLOCK_BIT) {
#define CPUCLOCK_ID_MASK ~CPUCLOCK_BIT
((clockid_t)(lwp_id) << 32 | (pid) | CPUCLOCK_BIT)