rtprio-test.c

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

void* thread_routine(void* param) {
	printf("I'm running\n");
}

#define CP(x) \
  { int r = (x); \
    if (r != 0) { printf("%s: %s (%d)\n", #x, strerror(r), r); exit(1); } }

int main() {
	pthread_t thread;
	pthread_attr_t attr;
	struct sched_param param;
	int r;
	void* value;

	param.sched_priority = 22;

	CP(pthread_attr_init(&attr));
	CP(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED));
	CP(pthread_attr_setschedpolicy(&attr, SCHED_RR));
	CP(pthread_attr_setschedparam(&attr, &param));
	CP(pthread_create(&thread, &attr, &thread_routine, NULL));
	CP(pthread_join(thread, &value));
}