Compare-and-swap is a hardware instruction, and beyond that a desirable pattern for dealing with concurrent writes. CMPXCHG https://www.felixcloutier.com/x86/

Compare-and-swap is a hardware instruction, and beyond that a desirable pattern for dealing with concurrent writes. CMPXCHG https://www.felixcloutier.com/x86/cmpxchg https://www.felixcloutier.com/x86/cmpxchg https://lwn.net/Articles/847973/ https://lwn.net/Articles/847973/