From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: moreau francis <francis_moreau2000@yahoo.fr>
Cc: mb@bu3sch.de, linux-kernel@vger.kernel.org
Subject: Re: [HW_RNG] How to use generic rng in kernel space
Date: Tue, 01 Aug 2006 14:29:54 +0100 [thread overview]
Message-ID: <1154438995.15540.5.camel@localhost.localdomain> (raw)
In-Reply-To: <20060801120937.69641.qmail@web25813.mail.ukl.yahoo.com>
Ar Maw, 2006-08-01 am 12:09 +0000, ysgrifennodd moreau francis:
> Another question about the implementation. If O_NONBLOCK
> flag is passed when opening /dev/hw_random, how does the
> read method ensure that the caller won't sleep since it calls
> mutex_lock_interruptible() function unconditiannaly ? I must
> miss something but don't know what...
O_NONBLOCK doesn't necessarily imply "never sleep", it implies "don't
sleep waiting for an event/long time". So where the mutex is just
serializing access to hardware that will be very brief it is fine not to
check O_NONBLOCK/FNDELAY.
next prev parent reply other threads:[~2006-08-01 13:10 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-01 12:09 [HW_RNG] How to use generic rng in kernel space moreau francis
2006-08-01 13:29 ` Alan Cox [this message]
2006-08-01 13:28 ` Re : " moreau francis
2006-08-01 20:49 ` Michael Buesch
2006-08-04 13:00 ` Re : " moreau francis
2006-08-04 21:08 ` Michael Buesch
2006-08-05 1:44 ` Jeff Garzik
2006-08-08 15:39 ` Re : " moreau francis
2006-08-08 17:34 ` Michael Buesch
2006-08-09 10:02 ` Re : " moreau francis
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1154438995.15540.5.camel@localhost.localdomain \
--to=alan@lxorguk.ukuu.org.uk \
--cc=francis_moreau2000@yahoo.fr \
--cc=linux-kernel@vger.kernel.org \
--cc=mb@bu3sch.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.