is +=1 thread safe

[Marc 'BlackJack' Rintsch]

On Thu, 01 May 2008 15:33:09 -0700, Gary Herron wrote:

> Of course it's not thread safe.   For the same reason and more basic, 
> even the expression i++ is not thread safe in C++.
> 
> Any such calculation, on modern processors, requires three operations: 
>   retrieve value of i into a register,
>   increment the register
>   write the value into i.

There are no modern processors with an opcode for incrementing a memory
location!?  At least my C64 can do that.  ;-)

Ciao,
	Marc 'BlackJack' Rintsch