Re: [asio-users] Request for native scatter/gather io support on windows

[Christopher K. <ch...@ko...>]

On Fri, 26 Jun 2009 16:19 -0500, "Zachary Turner"
<div...@gm...> wrote:
> Would it be possible in subsequent versions of ASIO to provide a class
> such as win_iocp_file_handle_service whose implementations will use
> functions ReadFileScatter and WriteFileGather instead of ReadFile and
> WriteFile?  This only works on files so it could not just replace the
> existing implementation.  I noticed that for sockets the builtin
> scatter/gather support from WSASend / WSARecv is being used, so I
> would think it could be used here as well.

Unfortunately, ReadFileScatter and WriteFileGather seem to be a lot more
restrictive that WSASend and WSARecv, in that each buffer must be page
aligned and one page big. It needs a bit more thought on how to
incorporate it nicely, so I think better to plan to stick with
overlapped_ptr for now.

Cheers,
Chris