linux-kernel - Re: really generic, type save and type definable.

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Date:	Fri, 28 May 2010 12:32:27 +0200
From:	Stefani Seibold <stefani@...bold.net>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	andi@...stfloor.org, gregkh@...e.de, alan@...rguk.ukuu.org.uk,
	tytso@....edu, iws@...o.caltech.edu
Subject: Re: really generic, type save and type definable.

Am Freitag, den 28.05.2010, 09:43 +0200 schrieb Henrik Rydberg:
> stefani@...bold.net wrote:
> [...]
> > The main goal was to provide an API which is very intuitive, save and easy
> > to use. So linux will get now a powerful fifo API which provides all what 
> > a developer needs. This will save in the future a lot of kernel space, since
> > there is no need to write an own implementation. Most of the device driver 
> > developers need a fifo, and also deep kernel development will gain benefit 
> > from this API.
> 
> The meaning of the term "multiple readers" referred to in the header is somewhat
> ambiguous. It could in principle refer to concurrent reading of the same
> position, or concurrent reading from different positions. Imaginably, those
> cases also have different locking behavior.
> 
> What happens if two fifos are initialized with the same memory buffer?
> 

That would be a big nonsense! Tell me a real use case for such kind of
request...

> What about one-to-many and many-to-one cases? The input system and the logging
> facilities could serve as examples where such buffers would be useful.
> 

There is no ne-to-many and many-to-one cases since the API will handle
this. You can not read more data then fit in the fifo, also u can not
write more data the fifo can handle.

Stefani


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