memory barriers in linuxthread

[Ulrich Drepper]

Hi,

I've checked in a patch to add memory barriers in the thread code
where they are necessary.  Xavier sent the patch based on comments
from Mike Burrows from DEC.

Xavier added a few comments in the pt-machine.h files for the
architectures (Alpha, PPC, SPARC, SPARC64).  Please take a look
whether the introduced definitions are correct and optimal.

For MIPS and IA-64: you'll have to come up with appropriate
definitions.

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