main.cpp

/**
 * A C++11 thread program illustrating how to
 * create a simple thread and some of the C++11 Thread STL class API.
 * This program implements the summation function where
 * the summation operation is run as a separate thread.
 *
 * Most Unix/Linux/OS X users:
 * g++ thrd-cpp11.cpp -lpthread
 */

#include <iostream>
#include <thread>
#include <vector>

using namespace std;

int sum = 0; /* this data is shared by the thread(s) */


void runner(int upper) {
	sum += upper;
}


int main(int argc, char* argv[]) {
	if (argc != 2) {
		cerr << "usage: a.out <integer value>\n";
		return -1;
	}

	int arg = atoi(argv[1]);
	
	if (arg < 0) {
		cerr << "Argument " << arg << " must be non-negative\n";
		return -1;
	}

    vector<thread> v1;
    for(int i = 1; i <= arg; i++) {
        v1.push_back(thread(runner, i));
    }

	thread th(&runner, arg);
	th.join();
	cout << "sum = " << sum << endl;
	return 0;
}