atomic != exchange

Posted Mar 15, 2014 6:18 UTC (Sat) by bnorris (subscriber, #92090)
Parent article: MCS locks and qspinlocks

> So there is no need for atomic operations when making changes to that structure

s/atomic/atomic exchange/

I believe you still need to use an atomic write operation, so that the CPU can read its own lock coherently; it just doesn't need to be an atomic exchange, since there are no other modifiers.