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

int count = 0;
#define COUNT_MAX 10

pthread_mutex_t mutexsum;


void *countSum(void *tid){
    long id = (long)tid;

    while(count < COUNT_MAX){
        pthread_mutex_lock (&mutexsum);
        count = count +1;        
        printf("Thread %ld: contador em %d\n", id, count);
        pthread_mutex_unlock (&mutexsum);

        sleep(rand() % 3);

    }
    pthread_exit(NULL);
}


int main(){
    pthread_t t1, t2; //criando t1 e t2 do tipo thread
    int create; //variável que recebe o retorno da função pthread_create()
    long num; //identificador da thread

    pthread_mutex_init(&mutexsum, NULL);
    num = 1;
    printf("Main: criando a thread %ld\n", num);
    create = pthread_create(&t1, NULL, countSum, (void *)num); //criando thread 1

    num = 2;
    printf("Main: criando a thread %ld\n", num);
    create = pthread_create(&t2, NULL, countSum, (void *)num); //criando thread 2


    pthread_join(t1, NULL);
    pthread_join(t2, NULL);
    printf("Main: finalizando\n");

    pthread_mutex_destroy(&mutexsum);
    
    return 0;
}