#include <iostream>

#include <map>

#include <string>

#include <chrono>

#include <thread>

#include <mutex>

std::map<std::string, std::string> g_pages;

std::mutex g_pages_mutex;

void save_page(const std::string &url)

{

// simulate a long page fetch

std::this_thread::sleep_for(std::chrono::seconds(2));

std::string result = "fake content";

std::lock_guard<std::mutex> guard(g_pages_mutex);

g_pages[url] = result;

}

int main()

{

std::thread t1(save_page, "http://foo");

std::thread t2(save_page, "http://bar");

t1.join();

t2.join();

// safe to access g_pages without lock now, as the threads are joined

for (const auto &pair : g_pages) {

std::cout << pair.first << " => " << pair.second << '\n';

}

}