Curious global variable bug? Bad assumptions on my part?

[Eljay Love-Jensen]

Hi Matthew,

> Huh? I thought SMP hardware is required to be responsible for cache
> syncing in such an instance...

No.  Alas.  Perhaps on some SMP hardware, but not all.

For the hardware I used, which definitely did not have that feature, that's
why the pthread library emitted a memory barrier around the mutex:  to
ensure the caches are synchronized.

Sincerely,
--Eljay