q5.c

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

#define NUM_OF_THREAD 10
static int res = 0;
int checkIsItPrime(int n) {
    int i, flag = 0;
    for (i = 2; i <= n / 2; ++i) {
        if (n % i == 0) {
            flag = 1;
            break;
        }
    }

    if (flag == 0)
        return 1;
    else
        return 0;
}

void *generateNumbersAndCountPrimes(void *arg) {
    int k,i;
    int primeCounter = 0;

    for (i = 0; i < 1000; i++) {
        int num = (rand() % (10000 - 1000 + 1)) + 1000;
        if (checkIsItPrime(num) != 1)
            continue;
        else
            primeCounter++;
    }
    res = primeCounter;

}

int main() {
    int threadsNumbersStructure[1][1000];
    int k, i;
    int arr = 1000;
    srand(time(NULL));

    for (i = 0; i < NUM_OF_THREAD; i++) {
        pthread_t thread_id;
        pthread_create(&thread_id, NULL, generateNumbersAndCountPrimes, (void *) arr );
        pthread_join(thread_id, NULL);
        printf("Thread %ld - ", i);
        printf("%d primes.\n", res);
    }
    exit(0);
}