#include <stdio.h>
#include <stdatomic.h>
#include <pthread.h>

atomic_int counter = 5;     //원자적 변수

void* producer(void* arg){
    for(int i = 0; i < 1000000; i++){
        atomic_fetch_add(&counter, 1);
    }

    return NULL;
}

void *consumer(void* arg){
    for(int i = 0; i < 1000000; i++){
        atomic_fetch_sub(&counter, 1);
    }

    return NULL;
}

int main(){
    pthread_t t1, t2;

    pthread_create(&t1, NULL, producer, NULL);
    pthread_create(&t2, NULL, consumer, NULL);

    pthread_join(t1, NULL);
    pthread_join(t2, NULL);

    printf("최종 Counter 값 : %d\n", counter);
    return 0;
}