RE: Synchronizing Bit operations V2

From: Chen, Kenneth W <kenneth.w.chen_at_intel.com>
Date: 2006-03-31 14:14:51
Christoph Lameter wrote on Thursday, March 30, 2006 7:12 PM
> > The use of
> >         smp_mb__before_clear_bit();
> >         clear_bit( ... );
> > 
> > is: all memory operations before this call will be visible before
> > the clear_bit().  To me, that's release semantics.
> 
> What of it? Release semantics are not a full fence or memory barrier.

The API did not require a full fence.  It is defined as a one way fence.
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Received on Fri Mar 31 14:14:42 2006

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