An asynchronous event notification library (pthreads) The libevent API provides a mechanism to execute a callback function when a specific event occurs on a file descriptor or after a timeout has been reached. libevent is meant to replace the asynchronous event loop found in event driven network servers. Currently, libevent supports /dev/poll, kqueue(2), event ports, select(2), poll(2) and epoll(4). If you want threading support and you're using pthreads, you'll need to link against the libevent_pthreads library in addition to libevent_core.