How to check if server is running successfully in another thread?

[jimmy-park]

We can't stop server immediately before server is calling listen(). So we have to check using is_running().

Server server;
auto t = thread([&]() { server.listen(HOST, PORT); });

while (!server.is_running())
    std::this_thread::sleep_for(std::chrono::milliseconds{10});

server.stop();
t.join();

However, this example has a problem because bind() or listen() could be failed before is_running(). The program may get stuck in a while loop. To prevent this, I need to add a flag.

std::atomic_bool done { false };
Server server;
auto t = thread([&]() { 
    server.listen(HOST, PORT);
    done = true;
});

while (!server.is_running() && !done)
    std::this_thread::sleep_for(std::chrono::milliseconds{10});

server.stop();
t.join();

Is this the correct way to use Server class? Or is there a better way to check the server?

[yhirose]

@jimmy-park yes, it's a correct way. Also I understand it's not a convenient way. I'll find a better way to handle the situation. Thanks!

[yhirose]

@jimmy-park I added wait_until_ready.