real-time summary

[Dan Kegel]

George Kraft IV wrote:
> Could someone summarize what are the past, present, & future "real time"
> standards, what the status of Linux is (ie., AIO, librt), and what work is being
> done to improve Linux to meet the current standard?

Ben LaHaise is working on an implementation of AIO that differs 
from Posix AIO, but has (or can have) a Posix AIO compatibility
layer.  This is good, as Posix AIO doesn't cover some important
things, and a few programs that need advanced AIO will benefit.
I still haven't tried it myself.

The patches (for 2.4.18-pre3 and glibc, I think) at http://kanga.kvack.org/~blah/aio/
Detailed design notes at http://lse.sourceforge.net/io/aionotes.txt
It and the older SGI KAIO mentioned at http://www.kegel.com/c10k.html#aio

It's not complete, and bugs are still being found in corner cases,
but it's already usable for apps that really, really need it.

- Dan


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