tThread.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 = *(int*)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");

    return NULL;
}

void criaThreads(char* const* args) {
    int maxValue;
    int maxThreads;
    long t;
    pthread_t *threads;

    maxValue = atoi(args[1]);
    maxThreads = atoi(args[2]);

    printf("Maximum integer   %d\n", maxValue);
    printf("Number of threads %d\n", maxThreads);
    
    threads = (pthread_t *)calloc(sizeof(pthread_t), maxThreads);

    for (t = 0; t < maxThreads; t++) {
        pthread_create(&threads[t], NULL, calculaPrimo, &maxValue);
    }

    for (t = 0; t < maxThreads; t++) {
        pthread_join(threads[t],NULL);
    }
}


int main(int argc, char* const* argv) {
    if (argc < 3) {
        printf("%s: insufficient parameters. Please inform maximum value and number of threads\n", argv[0]);
        return 1;
    }

    criaThreads(argv);
    pthread_exit(NULL);
    return 0;
}

File edited according to C90, aka ANSI C.