async.cpp

/**
 * async multi threading with c++
 * flag : -pthread -std=c++0x
 */

#include <iostream> // std::cout
#include <unistd.h> // sleep();
#include <future> // std::async

class MyClass {
    public:
        auto doStuffSoLong()->int
        {
            sleep(7);
            std::cout << "1" << std::endl << std::flush; //dont buffer
            return 0;
        }
        auto doAnotherStuff()->int
        {
            std::cout << "2" << std::endl << std::flush; //dont buffer
            return 0;
        }
        auto doAnotherLongStuff(const std::string &param)->int
        {
            sleep(3);
            std::cout << "3" << std::endl << std::flush; //dont buffer
            return 0;
        }
};

int main()
{
    sleep(3); // give a time to open task manager
    MyClass app;

    auto thread1 = std::async(std::launch::async, &MyClass::doStuffSoLong, &app);
    auto thread2 = std::async(std::launch::async, &MyClass::doAnotherStuff, &app);
    auto thread3 = std::async(std::launch::async, &MyClass::doAnotherLongStuff, &app, "hello world");
    if(thread1.get() == 0) std::cout << "thread 1 succes" << std::endl;
    if(thread2.get() == 0) std::cout << "thread 2 succes" << std::endl;
    if(thread3.get() == 0) std::cout << "thread 3 succes" << std::endl;

}