[PATCH] Add PTHREAD_MUTEX_NORMAL_INT

[Andi Kleen]

On Mon, Jun 24, 2013 at 04:25:52PM -0400, Carlos O'Donell wrote:
> On 06/24/2013 04:17 PM, Andi Kleen wrote:
> > From: Andi Kleen <ak@linux.intel.com>
> > 
> > Carlos asked for PTHREAD_MUTEX_NORMAL_INT to be added
> > to make some of the internal macros be easier to understand.
> > It is always identical to DEFAULT, as NORMAL only makes
> > a difference for settype.
> 
> Thanks for this.
> 
> As it stands however, with pthread_mutexattr_gettype loosing 
> the type originally entered by the user, we are going to have to
> propagate the new type internally.

It will return DEFAULT|NO_ELISION, which is identical in behaviour
to NORMAL

So if you do 

settype(&a, NORMAL);
settype(&b, gettype(&a));

it will all work as expected. Even b will have all NORMAL semantics.

The only case that wouldn't work is someone explicitely rechecking
the value returned by gettype(). Is that really a problem?

-Andi