From: j.neuschaefer@gmx.net (Jonathan Neuschäfer)
To: kernelnewbies@lists.kernelnewbies.org
Subject: When is to preempt safe?
Date: Fri, 7 Oct 2011 18:44:17 +0200 [thread overview]
Message-ID: <20111007164417.GB1475@debian.debian> (raw)
In-Reply-To: <CAOXENUj1DAGQ9-=N9VvU-ik9KDaTNHwWqEsDP6RPj=nrBpogQw@mail.gmail.com>
On Fri, Oct 07, 2011 at 07:27:12PM +0800, Parmenides wrote:
> 2. Another statement from Love is that "the kernel can preempt a task
> running in the kernel so long as it does not hold a lock". Why is it
> not safe while kernel code holding lock?
If you preempt while a lock is being held, another task could try to
acquire the same lock, causing a deadlock.
HTH,
Jonathan Neusch?fer
next prev parent reply other threads:[~2011-10-07 16:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-07 11:27 When is to preempt safe? Parmenides
2011-10-07 16:32 ` Chetan Nanda
2011-10-08 16:19 ` Parmenides
2011-10-08 17:09 ` Daniel Baluta
2011-10-08 17:32 ` Dave Hylands
2011-10-09 11:52 ` Parmenides
2011-10-09 13:52 ` michi1 at michaelblizek.twilightparadox.com
2011-10-09 6:42 ` Michael Blizek
2011-10-07 16:44 ` Jonathan Neuschäfer [this message]
2011-10-07 19:39 ` Michael Blizek
2011-10-08 16:24 ` Parmenides
2011-10-09 6:29 ` Michael Blizek
2011-10-09 6:53 ` Dave Hylands
2011-10-09 13:44 ` michi1 at michaelblizek.twilightparadox.com
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