Messages in this thread | | | Date | Tue, 11 Oct 2005 20:12:28 -0600 | From | "Christopher Friesen" <> | Subject | Re: SMP syncronization on AMD processors (broken?) |
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linux@horizon.com wrote:
> The right thing to do here is to wait for the flag to be set *outside* > the lock, and then re-validate inside the lock:
This may work on some processors, but on others the read of "progress" in XXX, or the write in YYY may require arch-specific code to force the update out to other cpus.
Alternately, explicitly atomic operations should suffice, but a simple increment is probably not enough for portable code.
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