LogCabin uses its event loop for network operations but then hands requests off to threads to process. I started out with libevent2, but the problem is it doesn't deal with having multiple threads very well (error-prone and inefficient). It's also not as well-documented as the man pages for epoll, so I ended up using epoll directly instead. What was really lost in the libevent2 -> epoll conversion was platform independence, but I think it might be better to get that back through well-placed #ifdefs or relying on some other library; I wouldn't go back to libevent2.