#include <iostream>
#include <atomic>
#include <thread>
#include <mutex>
#include <vector>

using namespace std;

// In this version, rather than synchronize the data,
// we synchronize execution of the code, in particular,
// the increase_unsync method

mutex globalMutex;  // mutex to control exeuction of method

int unsync_counter = 0;

void increase(int n) {
  for (int i=0; i<n; ++i)
    ++unsync_counter;
}

int main (int argc, char *argv[])
{
  auto t1 = chrono::high_resolution_clock::now();
  for (int i=1; i<=10; ++i)
    increase(10000000);

  cout << endl << "unsync_counter: " << unsync_counter << '\n';
  auto t2 = chrono::high_resolution_clock::now();
  cout << chrono::duration_cast<chrono::microseconds>(t2 - t1).count()
       << " microseconds"
       << endl;

  return 0;
}