http://bugs.winehq.org/show_bug.cgi?id=19982
--- Comment #6 from Juan Lang juan_lang@yahoo.com 2009-09-09 12:39:00 --- Created an attachment (id=23529) --> (http://bugs.winehq.org/attachment.cgi?id=23529) Patch: Use kernel support for thread affinity when available
It turns out I'd already written a patch for thread affinity, but it was rejected along with the process one, probably because the process one needed work. It also doesn't compile on MacOS, but as far as I know there isn't a similar system call there anyway. Does it address the issue for you?