lkml.org 
[lkml]   [2009]   [Jul]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] cgroup: fix reverse unlock sequence in cgroup_get_sb
From
On Tue, Jul 21, 2009 at 5:01 AM, Balbir Singh<balbir@linux.vnet.ibm.com> wrote:
>
> lock(A)
> lock(B)
> unlock(A)
> unlock(B)
>
> Tomorrow if a unsuspecting programmer does this
>
> lock(A)
> lock(B)
> unlock(A)
>
> code block
>
> unlock(B)
>
>
> What protects code block? lock B? Is that the intention?
>

An "unsuspecting programmer" shouldn't be adding code to
multi-threaded routines without thoroughly understanding the locking.

I guess there's no harm in this patch, but as Li says, it doesn't
really change anything.

Paul


\
 
 \ /
  Last update: 2009-07-21 17:37    [from the cache]
©2003-2011 Jasper Spaans