[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Trivial trivfs question
|
From: |
Marcus Brinkmann |
|
Subject: |
Re: Trivial trivfs question |
|
Date: |
Wed, 1 Aug 2001 17:18:35 +0200 |
|
User-agent: |
Mutt/1.3.18i |
On Wed, Aug 01, 2001 at 04:38:55PM +0200, Wolfgang wrote:
> Hi!
>
> If my translator is able to provide an unlimited amount of data, what
> is the best value to write into `*amount' (in trivfs_S_io_readable())?
> An arbitrary high number?
This depends on how "fast" it can deliver the data. The random device can
deliver an unlimited amount of data, but not without blocking after the
buffer is emptied and no entropy available anymore.
The meaning of "fast" is the same as for O_NONBLOCK.
If you can deliver an unlimited number of bytes without blocking, I think
the highest possible value that fits in mach_msg_type_number_t seems to be
appropriate. (I hope applications can deal with that).
Marcus
--
`Rhubarb is no Egyptian god.' Debian http://www.debian.org brinkmd@debian.org
Marcus Brinkmann GNU http://www.gnu.org marcus@gnu.org
Marcus.Brinkmann@ruhr-uni-bochum.de
http://www.marcus-brinkmann.de