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

typedef struct {
    int money;
} account_t;

account_t acc[3];
sem_t sem[3];

void *mainThread(void* arg) {
    int index=*((int*)arg);
    srand((unsigned int)pthread_self());
    int r,rValue;
    while(1) {
        r=rand()%9;
        sleep(r);

        sem_wait(&sem[index]);
        printf("Saldo%d : %d\n",index,acc[index].money);
        sem_post(&sem[index]);

        r=rand()%5;
        rValue=1000+rand()%5001;

        sem_wait(&sem[index]);
        printf("Saldo%d : %d-%d=%d\n",index,acc[index].money,rValue,acc[index].money-rValue);
        acc[index].money-=rValue;
        sem_post(&sem[index]);

        sem_wait(&sem[3-index]);
        printf("Saldo%d : %d+%d=%d\n",3-index,acc[3-index].money,rValue,acc[3-index].money+rValue);
        acc[3-index].money+=rValue;
        sem_post(&sem[3-index]);
        sleep(r);
    }


    pthread_exit(NULL);
}

int main(int argc, char **argv) {
    sem_init(&sem[1],0,1);
    sem_init(&sem[2],0,1);
    acc[1].money=acc[2].money=100000;
    pthread_t usr1,usr2;
    int usrIndex1=1,usrIndex2=2;
    pthread_create(&usr1,NULL,mainThread,&usrIndex1);
    pthread_create(&usr2,NULL,mainThread,&usrIndex2);
    while(1) {
        //
    }
    return 0;
}