//not executing at sololearn but working in VS.. May be join threads not availible here today(01.2020)or something wrong in code. #include #include //#include #include using namespace std; //some function to spent processor time. using isnstead of sleep_for to see that parallel code execute faster. long int calc(long z) { long int x(0); if (z == 0) return x; for(long int i=0;if_return: call = " << c << endl; int elapsed_time = std::chrono::duration_cast(end - start).count(); cout << "continuous executing time = " << elapsed_time << " ms" << endl; cout << endl << "using threads:" << endl; int d = 5, output; //start of function execution different threads start = chrono::high_resolution_clock::now(); //simple using thread thread t1(f_simple); //to send value by reference must use std::ref() or thread reate own example of variable thread t2(f_args_set, ref(d)); //to return value from thread shoud using lambda or pass by arguments reference thread t3([&]() { output = f_return(9); } ); //waiting threads while they are finish execution t1.join(); t2.join(); t3.join(); //end of functions execution end = chrono::high_resolution_clock::now(); elapsed_time = std::chrono::duration_cast(end - start).count(); cout << "paralell executing time = " << elapsed_time << " ms" << endl; return 1; }

std::thread