> 4 byte atomic write

[Guest]

Is it possible to write more than 4 bytes atomically?

[VDO]

mem qword 0

LOCK CMPXCH8B [mem]

if (edx:eax == dest)
{
zf = 1
dest = ecx:ebx
}
else
{
zf = 0
edx:eax = dest
}