#include <stdio.h>
#include <pthread.h>
#include <sched.h>
#define _GNU_SOURCE

void *tarefa(void *id){
    long int tid = (long int )id;
    int i = 1;
    while(i<=5){
        printf("Sou a thread %ld e estou no numero %d .\n", tid, i);
        i++;
        sched_yield();
    }
}
int main(){
    cpu_set_t mascaranucleos; // Bitmask para os n´ucleos
    CPU_ZERO(&mascaranucleos);// Remove a selec¸˜ao de todos os n´ucleos
    CPU_SET(0, &mascaranucleos); // Marca somente um n´ucleo 0 para uso
    sched_setaffinity(0, sizeof(cpu_set_t), &mascaranucleos);

    const int NUMTHREADS = 10;
    pthread_t threads[NUMTHREADS];

    for (long int i = 0; i < NUMTHREADS; i++) {
        pthread_create(&threads[i], NULL, tarefa, (void *) i);
    }
    for (long int i = 0; i < NUMTHREADS; i++) {
        pthread_join(threads[i], NULL);
    }
    return 0;
}

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

void *tarefa(void *id){
    long int tid = (long int )id;
    int i = 1;
    while(i<=5){
        printf("Sou a thread %ld e estou no numero %d .\n", tid, i);
        i++;
    }
}
int main(){
    const int NUMTHREADS = 10;
    pthread_t threads[NUMTHREADS];

    for (long int i = 0; i < NUMTHREADS; i++) {
        pthread_create(&threads[i], NULL, tarefa, (void *) i);
    }
    for (long int i = 0; i < NUMTHREADS; i++) {
        pthread_join(threads[i], NULL);
    }
    return 0;
}