[ryanschneider]

iPhones and iOS have had this for quite awhile. My iOS dev knowledge is rather dated now but IIRC Grand Central Dispatch let you indicate the type of workload your task needed and thus which core type it was typically scheduled on.

[mobilio]

GCD first appear on OSX 10.5 or 10.6 as i remember.

[stiGGG]

GCD first appeared on 10.6 Snow Leopard, which was marketed as a bug-fix only release and is due to this romanticised until today, but in reality included major changes under the hood and wasn’t very stable in his first versions.