/*
 * "THE CHEESE-WARE LICENSE" (Revision 1):
 * <ElectronixTM> wrote this file. As long as you retain this notice
 * you can do whatever you want with this stuff. If we meet some day,
 * and you think this stuff is worth it, you can buy me some cheese
 * in return
 */

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

volatile unsigned long long global = 0;

#define NR_THREADS 4
#define GLOBAL_STOP_VALUE 15

pthread_t threads[NR_THREADS] = {0};

void *thread_routine(void* args)
{
    size_t arg = *((size_t *) args);
    // Так как на глобальном счетчике нет синхронизации,
    // количество выводов в консоль можен не совпадать с
    // GLOBAL_STOP_VALUE
    while (global < GLOBAL_STOP_VALUE) {
        printf("Hello from thread %lu\n", arg);
        global += 1;
        sleep(5);
    }
    pthread_exit(NULL);
}

int main()
{
    for (size_t i = 0; i < NR_THREADS; i++) {
        size_t *arg = malloc(sizeof(*arg));
        assert(arg);
        *arg = i;
        pthread_create(&threads[i], NULL, thread_routine, arg);
    }

    int ret;
    for (size_t i = 0; i < NR_THREADS; i++) {
        ret = pthread_join(threads[i], NULL);
        if (ret) {
            break;
        }
    }
    return 0;
}