#include <bits/pthreadtypes.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

pthread_t tid[2];
int counter;
pthread_mutex_t lock;

void *trythis(void *arg) {
        pthread_mutex_lock(&lock);
        unsigned long i = 0;
        counter += 1;
        printf("\n Job %d has started\n", counter);

        for (i = 0; i < (0xFFFFFFFF); i++)
                ;
        printf("\n Job %d has finished\n", counter);
        pthread_mutex_unlock(&lock);
        return NULL;
}

int main(void) {
        int i = 0;
        int error;

        pthread_mutex_init(&lock, NULL);

        while (i < 2) {
                error = pthread_create(&(tid[i]), NULL, &trythis, NULL);
                if (error != 0)
                        printf("\nThread can't be created : [%s]",
                               strerror(error));
                i++;
        }

        pthread_join(tid[0], NULL);
        pthread_join(tid[1], NULL);

        pthread_mutex_destroy(&lock);

        return 0;
}