lkml.org 
[lkml]   [2009]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/2] lockdep: Don't only check recursive read locks once in a sequence
On Thu, Nov 19, 2009 at 06:13:48PM +0100, Peter Zijlstra wrote:
> On Thu, 2009-11-19 at 16:55 +0100, Frederic Weisbecker wrote:
> > And btw I
> > don't understand why rwsem read locks are not considered as
> > recursive in lockdep.
>
> Because they're not.
>
> rwsems are FIFO fair, so a double read can deadlock when there's a
> pending writer inbetween.
>


Aah ok. That's the subtle thing I was missing :)

Thanks.



\
 
 \ /
  Last update: 2009-11-20 02:01    [W:0.042 / U:1.344 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site