tThread_orig.c

// From https://pt.stackoverflow.com/questions/516989/c%c3%b3digo-compila-mas-n%c3%a3o-funciona-apenas-finaliza-com-sucesso

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

void *calculaPrimo(void *limitValue) {
    int primo, j;
    int num = 1;
    int maxValue = limitValue;

    while (num <= maxValue) {
        primo = 1;

        for (j = 2; j < num && primo; j++) {
            if (num % j == 0) {
                primo = 0;
            }
        }
        if (primo == 1) {
            printf("%d ", num);
        }
        num++;
    }
    printf("\n");
}

void criaThreads(char *args[]) {
    int maxValue = atoi(args[1]);
    int maxThreads = atoi(args[2]);
    printf("%d , %d", maxValue, maxThreads);
    
    long t;
    
    pthread_t threads[maxThreads];
    for (t = 0; t < maxThreads; t++) {
        pthread_create(&threads[t], NULL,(void * ) calculaPrimo, &maxValue);
    }
    for (t = 0; t < maxThreads; t++) {
        pthread_join(threads[t],NULL);
    }

}


int main(int argc, int argv[]) {
    char *args[] = {argv[0], argv[1], argv[2]};
    criaThreads(args);
    pthread_exit(NULL);
    return 0;
}

Original file, from https://pt.stackoverflow.com page.