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

int gold = 0;
pthread_mutex_t mutex[2];
void *mining()
{
        int times;
        for(times = 0 ; times < 20 ; ++times) {
            pthread_mutex_lock (&mutex[0]);
            gold += 10;
            printf("%dMiner 1 gathered 10 gold\n", times);
            sleep(2);
            pthread_mutex_unlock (&mutex[0]);
        }
    return 0;
}

void *sell()
{
    int times;
    for(times = 0 ; times < 20 ; ++times) {
            pthread_mutex_lock (&mutex[1]);
            if(gold < 10)
            {
                printf("The warehouse is empty, cannot sell!\n");
            }else
            {
                gold -= 10;
                printf("Trader 1 sold 10 gold\n");
        sleep(2);
            }
            pthread_mutex_unlock (&mutex[1]);
    }
}
int main ()
{
    pthread_t miner, seller;

    pthread_mutex_init(&mutex[0], NULL);
    pthread_create(&miner, NULL, mining, NULL);
    pthread_mutex_init(&mutex[1]);
    pthread_create(&seller, NULL, sell, NULL);

    pthread_mutex_destroy(&mutex[0]);
    pthread_mutex_destroy(&mutex[1]);
    pthread_join(miner, NULL);
    pthread_join(seller, NULL);
    printf("Gold: %d", gold);
    return 0;
}