x86 equivalent for LWARX and STWCX

Question

I\'m looking for an equivalent of LWARX and STWCX (as found on the PowerPC processors) or a way to implement similar functionality on the x86 platform. Also, where would be

Answer 1

What you are trying to do will not work the way you expect. What you implemented above can be done with the InterlockedIncrement function (Win32 function; assembly: XADD).

The reason that your code does not do what you think it does is that another thread can still change the value between the second read of *ptr and stwcx without invalidating the stwcx.