Yes, this is something where different CPU architectures do it differently, even between ARMv7 and ARMv8 etc. There's a great presentation on the differences he

Yes, this is something where different CPU architectures do it differently, even between ARMv7 and ARMv8 etc. There's a great presentation on the differences here: https://channel9.msdn.com/Shows/Going+Deep/Cpp-and-Beyond-2012-Herb-Sutter-atomic-Weapons-1-of-2 https://channel9.msdn.com/Shows/Going+Deep/Cpp-and-Beyond-20... https://channel9.msdn.com/Shows/Going+Deep/Cpp-and-Beyond-2012-Herb-Sutter-atomic-Weapons-2-of-2 https://channel9.msdn.com/Shows/Going+Deep/Cpp-and-Beyond-20... He goes into the details of ARM vs Intel etc in the middle of part 2, but really part 1 is well worth a watch.