int lock = 0;
int x = 0;


// 1.faze - nadefinovat funkci TSL

atomic int TSL(int& zam) {
  int u;
      u = zam;
      zam = 1;
      return u;
}







// 2.faze - nadefinovat mutex_lock, mutex_unlock


void mutex_lock (int &lock1) {
    while (TSL(lock1)) ;
}

void mutex_unlock (int &lock1) {
    lock1 = 0;
}




// 3. faze - overeni na inkrementaci promenne x


void a () {

  int i;
  for (i=0; i<50; i++) {
    mutex_lock(lock);
    x = x+1;
    mutex_unlock(lock); 
  }

}


main() {
  cobegin {
     a(); a();
  }
  cout << "vysledek je: " << x;
}