pthread sched_yield

when i want to make sure that one thing runs before another, like following

 

pid = fork()

if (pid) {
	// parent: yield to child so it can go
    sched_yield();
    printf("parent\n");
} else {
	printf("child\n");
}

 

reference

https://books.google.co.kr/books?id=4Kb_1sKprCMC&pg=PA171&lpg=PA171&dq=sched_yield+takes+most+of+running+time&source=bl&ots=vamCJ2CXFO&sig=ACfU3U2NOLMVVJCG7_Gz-YuYIYUbwquetA&hl=en&sa=X&ved=2ahUKEwiH9pLg9PPpAhUZa94KHQD3Dk8Q6AEwBHoECAkQAQ#v=onepage&q=sched_yield%20takes%20most%20of%20running%20time&f=false