#include <boost/thread.hpp>
#include <boost/thread/barrier.hpp>
#include <iostream>
using namespace std;
using namespace boost;
boost::barrier sync_point(3);

void worker(int id) {
       cout << "thread:" << id << "before barrier " << endl;
       this_thread::sleep_for(boost::chrono::milliseconds(id*1000));
       cout << "Thread: " << id << "waiting at barrier " << endl;
       sync_point.wait();
       cout << "Thread: " << id << "passed barrier " << endl;

}

int main() {
        thread t1(worker,1):
        thread t2(worker,2);
        thread t3(worker,3);
        t1.join();
        t2.join();
        t3.join();
        return 0;
}