musl/src/thread/pthread_setschedparam.c

#include "pthread_impl.h"

int pthread_setschedparam(pthread_t t, int policy, const struct sched_param *param)
{
	int r;
	__lock(t->killlock);
	r = t->dead ? ESRCH : -__syscall(SYS_sched_setscheduler, t->tid, policy, param);
	__unlock(t->killlock);
	return r;
}