MacOS does not expose a POSIX compliant thread affinity interface. While it's theoretically possible to make an adhoc wrapper around the OSX interface to more closely resemble the POSIX interface, the necessity to include the pthread_t instead of a "simple" pid makes it very hard. For now, since most systems are still homogenous, the call will not actually set the affinity
MacOS does not expose a POSIX compliant thread affinity interface. While it's theoretically possible to make an adhoc wrapper around the OSX interface to more closely resemble the POSIX interface, the necessity to include the pthread_t instead of a "simple" pid makes it very hard. For now, since most systems are still homogenous, the call will not actually set the affinity