stdasync – Tarik Billa

Which std::async implementations use thread pools?

May 13, 2023 by Tarik

Black-Box Test Though “white box” check can be done via inspecting boost, libstdc++ or libc++ sources, or checking documentation like just::thread or MSVC Concurrency Runtime, but I can not deny myself the pleasure of writing C++11 code! I have made black-box test: LIVE DEMO #define BOOST_THREAD_PROVIDES_FUTURE #define BOOST_RESULT_OF_USE_DECLTYPE #include <boost/exception/exception.hpp> #include <boost/range/algorithm.hpp> #include <boost/move/iterator.hpp> #include … Read more

Can I use std::async without waiting for the future limitation?

April 13, 2023 by Tarik

You can move the future into a global object, so when the local future’s destructor runs it doesn’t have to wait for the asynchronous thread to complete. std::vector<std::future<void>> pending_futures; myResonseType processRequest(args…) { //Do some processing and valuate the address and the message… //Sending the e-mail async auto f = std::async(std::launch::async, sendMail, address, message); // transfer … Read more

Why should I use std::async?

January 25, 2023 by Tarik

it’s called async, but it got a really “sequential behaviour”, No, if you use the std::launch::async policy then it runs asynchronously in a new thread. If you don’t specify a policy it might run in a new thread. basically in the row where you call the future associated with your async function foo, the program … Read more

When to use std::async vs std::threads?

January 21, 2023 by Tarik

It’s not really an either-or thing – you can use futures (together with promises) with manually created std::threads. Using std::async is a convenient way to fire off a thread for some asynchronous computation and marshal the result back via a future but std::async is rather limited in the current standard. It will become more useful … Read more

What is the difference between packaged_task and async

November 14, 2022 by Tarik

Actually the example you just gave shows the differences if you use a rather long function, such as //! sleeps for one second and returns 1 auto sleep = [](){ std::this_thread::sleep_for(std::chrono::seconds(1)); return 1; }; Packaged task A packaged_task won’t start on it’s own, you have to invoke it: std::packaged_task<int()> task(sleep); auto f = task.get_future(); task(); … Read more