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#include <iostream>
#include <fstream>
#include <thread>
#include <mutex>
#include <string>
using namespace std;
//code
bool oneLine(istream &in, mutex &mut, int nr)
{
lock_guard<mutex> lg(mut);
string line;
if (not getline(in, line))
return false;
cout << nr << ": " << line << endl;
return true;
}
void io(istream &in, mutex &mut, int nr)
{
while (oneLine(in, mut, nr))
this_thread::yield();
}
int main(int argc, char **argv)
{
ifstream in(argv[1]);
mutex ioMutex;
thread t1(io, ref(in), ref(ioMutex), 1);
thread t2(io, ref(in), ref(ioMutex), 2);
thread t3(io, ref(in), ref(ioMutex), 3);
t1.join();
t2.join();
t3.join();
}
//=
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