21 messages in org.freebsd.freebsd-currentRe: FYI: usage of new AIO calls| From | Sent On | Attachments |
|---|---|---|
| John S. Dyson | Dec 1, 1997 11:26 am | |
| Nate Williams | Dec 1, 1997 12:57 pm | |
| John S. Dyson | Dec 1, 1997 1:02 pm | |
| Nate Williams | Dec 1, 1997 1:08 pm | |
| John S. Dyson | Dec 1, 1997 1:24 pm | |
| Nate Williams | Dec 1, 1997 1:29 pm | |
| John S. Dyson | Dec 1, 1997 1:49 pm | |
| Nate Williams | Dec 1, 1997 1:54 pm | |
| John S. Dyson | Dec 1, 1997 2:02 pm | |
| Nate Williams | Dec 1, 1997 2:13 pm | |
| J Wunsch | Dec 1, 1997 2:36 pm | |
| Terry Lambert | Dec 1, 1997 5:31 pm | |
| John S. Dyson | Dec 1, 1997 5:54 pm | |
| Tom | Dec 1, 1997 6:05 pm | |
| John S. Dyson | Dec 1, 1997 6:21 pm | |
| Terry Lambert | Dec 1, 1997 9:56 pm | |
| Terry Lambert | Dec 1, 1997 9:59 pm | |
| Terry Lambert | Dec 1, 1997 10:21 pm | |
| John S. Dyson | Dec 1, 1997 11:02 pm | |
| Terry Lambert | Dec 2, 1997 10:48 am | |
| John S. Dyson | Dec 2, 1997 10:54 am |
| Subject: | Re: FYI: usage of new AIO calls | |
|---|---|---|
| From: | John S. Dyson (to...@dyson.iquest.net) | |
| Date: | Dec 1, 1997 2:02:00 pm | |
| List: | org.freebsd.freebsd-current | |
Nate Williams said:
I wrote:
What is a VCHR device?
John replied:
VCHR files are character devices that you would see the 'c' in the first column for 'ls -l'.
Ahh, character special devices. SEF also pointed this out to me right after I got this email. I know what those are, but I've never heard them distinguished as VCHR devices.
I'm all better now, must have been too much Turkey. *grin*
If you know what the AIO/LIO functions are for, and have software that
One more question. AIO == Asynchronous I/O, but LIO?
AIO == Asynchronous I/O. LIO == List (directed) I/O.
LIO essentially allows for multiple AIO requests to be batched into a single system call. It is kind of like writev/readv, except you can intermix read and write system calls with LIO. With LIO, you can specify a signal to post when it is fully done. signanosleep(2) is especially useful in conjunction with LIO.