// compile: g++ -std=c++17 -pthread threads1.cpp
#include <iostream>       
#include <chrono>
#include <thread>         
using namespace std::chrono_literals; // s as second
void foo() { std::cout<<"started foo\n"; std::this_thread::sleep_for(3s); }
void bar(int x) { std::cout<<"started bar\n"; std::this_thread::sleep_for(5s); }

int main() {
  std::thread th1 (foo);     //  a thread calls foo()
  std::thread th2 (bar,0);   //  a thread calls bar(0)
  th1.join();                // wait for th1 to finish
  std::cout<<"th1 joins\n";
  th2.join();                // wait for th2 to finish
  std::cout<<"th2 joins\n";
}