Solution 3 CPU usage 50%

solution3.cpp

#include <boost/thread.hpp>
#include "windows.h"
#include <iostream>

void infiniteRunningLoop() {
    while (1) {
        ;
    }
}

int main() {
  boost::thread thread1(infiniteRunningLoop)
  boost::thread thread2(infiniteRunningLoop)
  thread1.join();
  thread2.join();
}