Re: CVS commit: src/sys/arch

[yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)]

> Module Name:  src
> Committed By: ad
> Date:         Thu Feb 21 16:31:13 UTC 2008
> 
> Modified Files:
>       src/sys/arch/amd64/include: types.h
>       src/sys/arch/i386/include: types.h
> 
> Log Message:
> #define __HAVE_ATOMIC_AS_MEMBAR, indicating that:
> 
> - atomic_cas_ni() does an implicit membar_exit()
> - all other atomic operations do an implicit membar_sync()
> 
> While this might seem kind of arbitrary it's the basis for some important
> optimizations.
> 
> 
> To generate a diff of this commit:
> cvs rdiff -r1.25 -r1.26 src/sys/arch/amd64/include/types.h
> cvs rdiff -r1.58 -r1.59 src/sys/arch/i386/include/types.h
> 
> Please note that diffs are not public domain; they are subject to the
> copyright notices on the relevant files.

freebsd has acq/rel variants of atomic ops.
have you considered something similar?

YAMAMOTO Takashi