Thanks Nick. You know of any projects using buffevents + IOCP succesfully? I've read about memcached + libevent, but I don't think they use bufferevents.
/Juan 2011/7/3 Nick Mathewson <ni...@freehaven.net>: > On Fri, Jul 1, 2011 at 11:26 AM, Juan Pablo Fernandez > <this.j...@gmail.com> wrote: >> Hi, >> >> I've been experimenting with libevent on windows. I want to use IOCP, >> worker threads filling a queue layer in a server application. >> Bufferevents is a nice fit! And I've written a small server using >> bufferevents. However, I'm confused reading the documentation, >> saying: >> >> 1, It's experimental (online book) >> 2, Back-end is still select-based. >> 3, Can be used for sending (no mention of receive) >> >> ==> What is the "true" status? > > It is indeed experimental. > > The select-based backend is still used for the event interface > provided by event_add, event_del, etc. It turns out that you can't > emulate that using IOCP, as far as I can tell.[*] If you want to use > IOCP, you need to use bufferevents: the bufferevent interface _can_ be > implemented with IOCP. > > And so there's an implementation of it. > > To use it, initialize Libevent passing the > EVENT_BASE_FLAG_STARTUP_IOCP flag in the event_base_config. This will > make subsequent calls to bufferevent_socket_new() return an IOCP-based > bufferevent, and evconnlistener_*new() return IOCP-based listeners. > > [*] Some people have in the past tried to implement the event backend > using IOCP, using a hack where "completing" a zero-length read or > write indicated that the socket was readable/writable. When we > investigated, it turned out that this works for reading, but not for > writing: sockets whose buffers are too full to write anything will > still accept a zero-length write and report it as "completed." If > there's a way around this, or somebody knows differently, I'd love to > know about it. > > yrs, > -- > Nick > *********************************************************************** > To unsubscribe, send an e-mail to majord...@freehaven.net with > unsubscribe libevent-users in the body. > -- //Juan Pablo Professional Computer Scientist The Software shall be used for Good, not Evil. *********************************************************************** To unsubscribe, send an e-mail to majord...@freehaven.net with unsubscribe libevent-users in the body.
