scoped-threadpool-std 0.1.1

A simple scoped threadpool implementation and related tests including a password hasher
Documentation 
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#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "thread_pool.h"

const uint64_t MAX_CANDIDATE = 100000;
const size_t NUM_THREADS = 16;
const size_t SLEEP_INTERVAL = MAX_CANDIDATE / 10;
const size_t SLEEP_SECONDS = 2;

void check_prime(void *_n) {
    uint64_t n = *(uint64_t *) _n;
    free(_n);

    for (uint64_t k = n / 2; k > 1; k--) {
        if (n % k == 0) {
            return;
        }
    }
    printf("%" PRIu64 "\n", n);
}

int main() {
    thread_pool_t *pool = thread_pool_init(NUM_THREADS);

    for (uint64_t i = 2; i < MAX_CANDIDATE; i++) {
        if (i % SLEEP_INTERVAL == 0) {
            sleep(SLEEP_SECONDS);
        }

        uint64_t *aux = malloc(sizeof(uint64_t));
        assert(aux != NULL);
        *aux = i;
        thread_pool_add_work(pool, check_prime, aux);
    }

    thread_pool_finish(pool);
}