Waiting on multiple events C++

Question

Is there a recommended way to wait on multiple inputs. For example I would like my program to be able to receive input from 3 sources:

Listen on a thread condition e.g.

Answer 1

On modern Linux the best way to do this is not to use pthread_cond_wait at all. Just use eventfd instead, which will enable you to listen for multiple events using select/poll/epoll.