Why does Boost.Asio not support an event-based interface?

Question

I am attempting to understand Boost.Asio, with the intention of potentially implementing a signaling system using condition variables in conjunction with Boost.Asio.

Answer 1

Condition variables are a synchronous concept: they block one thread until something happens in another thread. Boost.Asio is an asynchronous framework: it provides multiplexing of events in a non-blocking fashion. These two don't seem very compatible. If you want asynchronous event notification, look at eventfd on Linux, which should be usable with Boost.Asio.