[Libevent-users] IOCP writes

[Toby Douglass]

I wrote:
> As it is, it's easy to support serial writes with IOCP, it's supporting
> multiple concurrent writes which is awkward for a convenient-to-use API
> over IOCP - and this I would think is absolutely required for some uses of
> UDP sockets.

I've figured out a decent way of doing it, a permutation I've never used
before, upon the old trick of passing in your own pointer instead of the
one you've supposed to use.