use error
use sched.h
use process

int sched_setscheduler(pid_t pid, int policy, const struct sched_param *p)
	use(pid) ; use(policy) ; use(p)
	warn("sched_setscheduler is not implemented for Darwin")
	errno = EINVAL
	return -1

def SIGRTMIN 32
def SIGRTMAX 31