Can you provide API thread safety info in the README doc?

[Kexiii]

I think it's necessary to tell the user whether the API is thread safe(e.g. Is Client::Get(..) thread safe?).

[yhirose]

@Kexiii, basically, Client is not thread-safe. Only one thread can own the Client instance. But as you can see in the Client class, sock_ is declared as std::atomic<socket_t>. You can hold it in a different thread and safely call stop() method safely. In this particular case only, Client can be said as thread-safe.

Sorry for the incomplete documentation on README. Since this is just my 'after work'/'weekend' project, I simply don't have time to update it... I'll improve the documentation when I have time. I guess I need to mention thread-safety for the server as well.

Thanks for your interest!