lkml.org 
[lkml]   [2005]   [Dec]   [13]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateTue, 13 Dec 2005 10:39:49 +0100
FromIngo Molnar <>
SubjectRe: [PATCH 1/19] MUTEX: Introduce simple mutex implementation
* Christoph Hellwig <hch@infradead.org> wrote:

> On Tue, Dec 13, 2005 at 08:54:41AM +0100, Ingo Molnar wrote:
> > - i did not touch the 'struct semaphore' namespace, but introduced a
> >   'struct compat_semaphore'.
> 
> Because it's totally braindead.  Your compat_semaphore is a real 
> semaphore and your semaphore is a mutex.  So name them as such.

well, i had the choice between a 30K patch, a 300K patch and a 3000K 
patch. I went for the 30K patch ;-)

> > - i introduced a 'type-sensitive' macro wrapper that switches down() 
> >   (and the other APIs) to either to the assembly variant (if the 
> >   variable's type is struct compat_semaphore), or switches it to the new 
> >   generic mutex (if the type is struct semaphore), at build-time. There 
> >   is no runtime overhead due to this build-time-switching.
> 
> And this one is probably is a great help to win the obsfucated C 
> contests, but otherwise just harmfull.

i never found it to be harmful in any way, and we've now got a year of 
experience with them. Could you elaborate?

	Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-12-13 10:43    [from the cache]
©2003-2008