[Bug 19982] SetThreadAffinityMask() seems not to work correctly

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=19982





--- Comment #49 from ray at pobox.co.uk  2009-09-30 19:40:33 ---
(In reply to comment #48)
> Yes, and it fails in the same way here, if I understand the program well
> enough.  (I confess to finding SIV pretty confusing.)  Nevertheless, the
> sched_setaffinity calls succeed.  (I instrumented my own wineserver to verify
> it.)  So I'm leaning toward this being a kernel bug.

I think having a simple program to test this would be a good move.  Looking in
the Windows API I would like to use GetCurrentProcessorNumber() which returns
the zero based CPU number.  It's new in Vista and not in Wine.  Having this
would be very helpful, what is the best way to get it added to Wine ?  Is there
a Linux API that will do this ?

> Once we ask the kernel to
> schedule a thread on a different CPU, and the kernel says, "righto," there's
> nothing more we can do, is there?

If this is a Linux bug then can it we worked around ?  I am wondering if doing
a sched_yield() or similar after the affinity has been set would trigger a
switch to the appropriate CPU.

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