kern_sched_getscheduler
error = kern_sched_getscheduler(td, tdt, &policy);
error = kern_sched_getscheduler(td, tdt, &policy);
error = kern_sched_getscheduler(td, tdt, &policy);
e = kern_sched_getscheduler(td, targettd, &policy);
int kern_sched_getscheduler(struct thread *td, struct thread *targettd,