Mutex Safe, C (gcc)

Mutex Safe

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

int qualquer_coisa;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

void* incrementar(void* num) {
    int x, i;
    pthread_mutex_lock(&mutex);
    for (x = 0; x < 3; x++) {
        int temp = qualquer_coisa;
        for(i = 0; i < 10000; i++);
        qualquer_coisa = temp + 1;
    }
    pthread_mutex_unlock(&mutex);
    return 0;
}

void* decrementar(void* num) {
    int x,  i;
    pthread_mutex_lock(&mutex);
    for (x = 0; x < 3; x++) {
        int temp = qualquer_coisa;
        for(i = 0; i < 10000; i++);
        qualquer_coisa = temp - 1;
    }
    pthread_mutex_unlock(&mutex);
    return 0;
}

int main()
{
    int num_th1, num_th2;
    pthread_t th1, th2;
    qualquer_coisa = 10;
    pthread_create(&th1, NULL, incrementar, (void*) &num_th1);
    pthread_create(&th2, NULL, decrementar, (void*) &num_th2);
        
    pthread_join(th1, NULL);
    pthread_join(th2, NULL);
    printf("Resultado %d \n", qualquer_coisa);
    return 0;
}


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