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#include <iostream>
#include <thread>
#include <atomic>
#include <chrono>
#include <string>
using namespace std;
 
void timer(atomic<bool>& stop)
{
	unsigned cnt = 0;
	while (this_thread::sleep_for(1s), stop == false)
	{
		cerr << (++cnt) << endl;
	}
 
	cerr << "Timer's stopped" << endl;
}
 
int main()
{
	atomic<bool> stop{false};
 
	thread t{timer, ref(stop)};
 
	string s;
 
	while (cin >> s, s != "stop")
	{
		cout << "echo " << s << endl;
	}
 
	stop.store(true);
	t.join();
	return 0;
}

/home/WoF7Nf/ccAEIvzc.o: In function `std::thread::thread<void (&)(std::atomic<bool>&), std::reference_wrapper<std::atomic<bool> > >(void (&)(std::atomic<bool>&), std::reference_wrapper<std::atomic<bool> >&&)':
prog.cpp:(.text._ZNSt6threadC2IRFvRSt6atomicIbEEISt17reference_wrapperIS2_EEEEOT_DpOT0_[_ZNSt6threadC5IRFvRSt6atomicIbEEISt17reference_wrapperIS2_EEEEOT_DpOT0_]+0x2): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status

Standard output is empty