can anyone explain to me how bufferevent ( in libevent) works for non-blocking sockets? [closed]

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The documentation for libevent 2.0 isn't easy to understand. Can anyone point me to a tutorial?

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http://www.wangafu.net/~nickm/libevent-book/

is a great tutorial on libevent, with loads of examples. As a bonus, it's written by Nick Mathewson, one of the two maintainers of the libevent project.

For bufferevents, you can look at the basics as well as the advanced bits.